http://revista-agroproductividad.org/index.php/agroproductividad/issue/feed Agro Productividad 2021-01-04T23:07:05+00:00 Dr. Jorge Cadena Iñiguez agroproductividadeditor@gmail.com Open Journal Systems <p><strong>Agro Productividad</strong> es una publicación mensual del Colegio de Postgraduados en Ciencias Agrícolas. Fue fundada en 2008 con el objetivo de difundir resultados en artículos científicos originales, así como notas científicas, revisiones temáticas, relacionados con la agricultura (cultivos, silvicultura, ganadería, pesca y acuicultura, y agroindustria) y la producción de agroalimentos.</p> <p>También aborda temáticas sobre procesos económicos, sociales y ambientales que impactan la productividad agrícola y el desarrollo rural.</p> <p>Todas las contribuciones recibidas son sometidas a un proceso de arbitraje doble ciego y edición final. La revista se publica en español y en inglés. Se encuentra indexada a diferentes indicadores nacionales e internacionales resaltando <strong>CONACYT </strong>(Competencia Internacional), <strong>Zoological Records, CAB ABSTRACTS, CABI, Periodica, </strong> <strong>Latindex </strong>(Directorio y Catálogo), <strong>Biblat, Master List y Clarivate Analytics, REDIB.<br /></strong></p> <p><strong> </strong></p> http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1773 In vitro conservation of Vanilla planifolia hybrids in minimal growth conditions 2020-07-23T02:00:55+00:00 Delfino Reyes Lopez delfino.reyes@correo.buap.mx Enrique Hernández Leal hernandez.enrique@inifap.gob.mx Carlos Roman Castillo Martínez castillo.carlos@inifap.gob.mx Carlos Hugo Avendaño Arrazate avendano.carlos@inifap.gob.mx Tarsicio Corona Torres tcoronat@colpos.mx Jesús García-Zavala zavala@colpos.mx Fermín Pascual Ramírez fpascualr@gmail.com <p><strong>Objective:</strong> To maintain minimal growth in <em>in vitro Vanilla planifolia </em>hybrids.</p> <p><strong>Design/Methodology/Approach:</strong> Explants of seven interspecific hybrids of <em>V. planifolia </em>with different origin parents were used. The treatments consisted of different doses of mannitol and sucrose in the culture medium which varied from 0, 5, 10, 15, 20, 25 and 30 g L<sup>-1</sup>.The number of nodes, shoots and roots was recorded every 30 d for six months.</p> <p><strong>Results:</strong> 30 g L<sup>-1</sup> mannitol and no sucrose in the culture medium allowed minimal growth in most of the hybrids. The higher the mannitol and lower the sucrose content, the length, number of between nodes, shoots and roots of the explants was lower (P?0.05).</p> <p><strong>Limitations of the study/implications</strong>: There is a differential behavior between the biological material and the used culture medium, particularly in hybrids, due to their new genetic combinations. Therefore, for their conservation, the culture medium components must be adjusted.</p> <p><strong>Conclusions:</strong> 30 g L<sup>-1</sup> mannitol without sucrose in in vitro culture medium significantly reduces growth during 180 d in vanilla hybrids.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1648 Nature-based tourism as an alternative for sustainable development in the Altas Montañas de Veracruz region, Mexico 2020-08-24T02:51:57+00:00 Juan A. Pérez-Sato arturom@colpos.mx Jaime Ernesto Rivera Hernández rivalcan@gmail.com Graciela Alcántara-Salinas arturom@colpos.mx Jaime E. Rivera-Hernández arturom@colpos.mx Rafael A. Muñoz-Márquez-Trujillo arturom@colpos.mx Araís Zárate-Rodríguez arturom@colpos.mx Edgardo Zalazar-Marcial arturom@colpos.mx Ricardo Sánchez-Páez arturom@colpos.mx Luis A. Castillo-González arturom@colpos.mx <p><strong>Objective:</strong> Determine the current state of nature-based tourism in the High Mountains Region of Veracruz, Mexico, by the analysis of participatory workshop results with most of the municipal tourism managers of the region.<br /><strong>Design/methodology/approach:</strong> A participatory workshop took place, the “1st. Nature-based Tourism Forum of the Altas Montañas de Veracruz Region”, for which an evaluation instrument was elaborated. The questionnaire, called “Technical Sheet for the Diagnosis and Inventory of Touristic Initiatives”, was filled by the participants. During this participatory workshop, the region was divided into five subregions and participants worked in separate tables by subregion.<br /><strong>Results:</strong> 106 consolidated projects were registered, 38 in process and 130 elements with tourism potential were identified; 53 problems that affect tourism in the region were also identified. A total of 123 people participated: 61 of them representing 32 municipalities, 16 were from seven municipalities, 12 represented five institutions and 34 people were organizers.<br /><strong>Limitations of the study/implications:</strong> The greatest limitation faced by this project was the participation of all municipal authorities throughout the whole region.<br /><strong>Findings/conclusions:</strong> Out of the 57 municipalities in the region 32 attended (more than 56%). The number of consolidated projects (106) is high, considering 44% of the municipalities were not present, which highlights that the majority are of the<br />community and private management. However, most of the projects in process aren organized by municipalities, which indicates their interest in tourism. Regard the elements with touristic potential in the region (natural and historical sites and traditions), the number registered was high (130). This is a consequence of the great biocultural wealth in the area, which can be developed and conserved through ecotourism.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 AgroProductividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1737 Effects of flowering and production inducers in the Mexican lime (Citrus aurantifolia Swingle) 2020-06-18T23:08:22+00:00 Rafael Ariza-Flores avendano.carlos@inifap.gob.mx Alejando Casimiro Michel-Aceves avendano.carlos@inifap.gob.mx Luis Antonio Gálvez-Marroquín avendano.carlos@inifap.gob.mx David Trujillo-García avendano.carlos@inifap.gob.mx CARLOS HUGO AVENDAÑO ARRAZATE avendano.carlos@inifap.gob.mx Nestro Espinosa-Paz avendano.carlos@inifap.gob.mx <p><strong>Objective:</strong> To evaluate new hormonal and biostimulant products to induce flowering of Mexican lime (<em>Citrus aurantifolia </em>Swingle) for winter production at the state of Guerrero, Mexico.</p> <p><strong>Design/methodology/approach: </strong>Prohexadione calcium (PHD-Ca), cytokinins, paclobutrazol, biuretic urea, granulated urea (46%) and a control were evaluated.</p> <p><strong>Results:</strong> There are differences between treatments for the number of flowers and number of fruits (Pr&gt;0.0411 and 0.048); regard the “number of flowers” variable, paclobutrazol, prohexadione calcium and granulated urea (46%) stood out; while, prohexadione calcium, paclobutrazol and cytokinins favor the “number of fruits” variable. The yields show statistical differences (Pr&gt;0.0332) and the cytokinins and paclobutrazol stood out.</p> <p><strong>Findings/conclusions:</strong> The usage of cytokinins for induction and winter production of Mexican lime is suggested.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1889 Chemical Composition and Digestibility of Six Species of Fodder (Fabaceae) 2020-11-25T16:47:51+00:00 Eliseo Sosa-Montes sergiomp@colpos.mx Sergio Iban Mendoza-Pedroza sergiomp@colpos.mx Perpetuo Álvarez-Vázquez sergiomp@colpos.mx Pablo Alfredo Domínguez-Martínez sergiomp@colpos.mx Ricardo Barcena-Gama sergiomp@colpos.mx Jessica Lorena Salazar-González sergiomp@colpos.mx <p><strong>Objectives:</strong> To determine the chemical composition and <em>in vitro </em>digestibility of <em>Acacia angustissima</em>, <em>Dalea </em>spp., <em>Desmodium </em>spp., <em>Leucaena leucocephala</em>, <em>Phaseolus vulgaris </em>and <em>Tephrosia vicioides </em>(Fabaceae) fodder species.</p> <p><strong>Design/Methodology/Approach:</strong> Crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), crude lignin (CL), cellulose (Cel), hemicellulose (Hcel), cellular content (CC) and <em>in vitro </em>dry matter digestibility (IVDMD) were determined. The design was completely random with three repetitions. The variables were correlated by pairs and the means of the species were compared with Tukey’s test (P&lt;0.05).</p> <p><strong>Results: </strong><em>Dalea </em>spp. had the highest crude protein (17.7%), followed by <em>A. angustissima </em>(15.9%) and <em>L. leucocephala </em>(14.1%). <em>A. angustissima </em>(73.2%), <em>Dalea </em>spp. (74.9%) and <em>P. vulgaris </em>(77.5%) showed the highest IVDMD. <em>L. leucocephala</em>, <em>Tephrosia</em> <em>vicioides </em>and <em>Desmodium </em>spp. showed the lowest values of CP (14.1, 11.8 and 12.3%, respectively) and IVDMD (70.4, 70.2 and 64.9%, respectively). <em>Desmodium </em>spp. showed high levels of NDF (59.2%), ADF (41.4%), CL (17.5%), Cel (29.7%) and Hcel (17.8%) (P?0.05). IVDMD showed positive correlation with CC and negative correlations with NDF, CL, and Hcel (P&lt;0.05).</p> <p><strong>Study Limitations/Implications</strong>: <em>Desmodium </em>spp. showed high content of CL and low values of CP and IVDMD, therefore supplements should be added when used in animal feed.</p> <p><strong>Findings/Conclusions:</strong> <em>Dalea </em>spp. showed low levels of lignin and high levels of protein and digestibility, making it posible to use as feed for ruminants</p> 2021-01-06T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1890 Prediction of Milk Production per Cow Lactation in the Mexican Tropics 2020-11-25T17:10:30+00:00 Mónica Yazmín Herrera-Sotero enriquez.javier@inifap.gob.mx Julio César Vinay-Vadillo enriquez.javier@inifap.gob.mx Elizabeth León-García enriquez.javier@inifap.gob.mx Javier Francisco Enríquez-Quiroz enriquez.javier@inifap.gob.mx Benjamín Alfredo Piña-Cárdenas enriquez.javier@inifap.gob.mx Perpetuo Alvarez-Vazquez enriquez.javier@inifap.gob.mx <p><strong>Objective:</strong> To evaluate non-linear and linear mathematical models used to estimate milk production per lactation, at different frequencies of milk weighing from records of Holstein (Ho), Brown Swiss (BS) cows and their crosses with Zebu (Z).</p> <p><strong>Design/Methodology/Approach:</strong> The models evaluated were: Wood, Wilmink and Linear Interpolation. Daily records of milk production from 471 lactations of 72 cows were used; 1,884 records were created with frequencies of weekly, biweekly and monthly milk production. The following were included in the statistical model: the genotype (Ho <em>X</em> Z and<br />SP <em>X </em>Z), birth season (rainy and dry), and number of lactation (1 and 2) with double and triple interactions. The statistical analyses were performed with GLM from MINITAB v17. The means were compared with Tukey’s test.</p> <p><strong>Results</strong>: No differences were found (P?0.05) between the models for the average milk production per lactation in kg, obtained from daily measurements or estimated from weekly, biweekly and monthly data, although for the factors of birth season, number of lactation, and genotype they showed differences (P ? 0.05) in milk production per lactation.</p> <p><strong>Study Limitations/Implications</strong>: Daily records of milk production are necessary to obtain production per lactation; the models applied predict milk production in a similar way in different frequencies of weighing in Holstein, Brown Swiss cows and their crosses with Zebu.</p> <p><strong>Findings/Conclusions:</strong> The models used allow predicting the milk production per cow in a similar way in different frequencies of weighing.</p> 2021-01-06T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1899 Characterization of subsistence sheep farming: The case of three communities of the municipality of Tlahuapan, Puebla, Mexico 2020-11-26T16:58:52+00:00 A. Galván-Antonio rjuan@colpos.mx M. Sánchez-Hernández rjuan@colpos.mx F. Calderón-Sánchez rjuan@colpos.mx J. de D. Guerrero-Rodríguez rjuan@colpos.mx <p><strong>Objective:</strong> to characterize household units for sheep production at three localities in the Santa Rita Tlahuapan municipality, Puebla.</p> <p><strong>Design/methodology/approach:</strong> semi-structured interviews conducted with 38 producers. Variables of the producer profile, crop production and herd management were analyzed using descriptive statistics, cluster analysis and variance analysis.</p> <p><strong>Results:</strong> four groups of producers were identified; most of them (92%) were classified as small producers, with 24 to 36sheep and low production of crop forage. The producer’s average age was 55 years, with an average family size of four.Economic savings is the main objective for this production and family labor is used exclusively in sheep farming activities.The animals are housed in rustic pens, with no difference in their age, sex or physiological stage. Their main food source is pastures forage and cultivation areas; mostly supplemented (92%) with mineral blocks and common salt.</p> <p><strong>Limitations/Implications:</strong> the lack of producer records and social mistrust to some degree to provide information.</p> <p><strong>Findings/conclusions:</strong> the assessed productive units are for subsistence, having sheep farming as a secondary activity, with low productive parameters. The poor housing practices, the scarcity of own grazing lands, and the animal’s nutritional stress are identified as the main factors that stagnate sheep farming in the study area.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1891 Egg Production by Hens Fed with Homemade or Commercial Concentrate in a Cage-Free System 2020-11-26T15:50:12+00:00 Fernando González-Cerón eliseososa@yahoo.com.mx María Alejandra Padilla-Jiménez eliseososa@yahoo.com.mx Arturo Pro-Martínez eliseososa@yahoo.com.mx José Isidro Alejos de la Fuente eliseososa@yahoo.com.mx Leodan Tadeo Rodríguez-Ortega eliseososa@yahoo.com.mx Eliseo Sosa-Montes eliseososa@yahoo.com.mx <p><strong>Objective:</strong> To evaluate two types of concentrate (homemade and commercial), in laying percentage (LP, %), weight (EW, g), and egg mass (EM, g bird<sup>-1</sup> d<sup>-1</sup>), among hens in a cage-free system.</p> <p><strong>Methodology: </strong>Sixty hens aged 37 weeks (Rhode Island Red and Barred Plymouth Rock) were assigned two treatments: COM, 150 g of commercial concentrate bird<sup>-1</sup> d<sup>-1</sup>and CAS, 150 g of homemade concentrate bird<sup>-1</sup> d<sup>-1</sup>. The birds were managed in a cage-free system with access to a meadow of white clover (<em>Trifolium repens </em>L.). LP, EW and EM were evaluated for 11 weeks.</p> <p><strong>Results:</strong> LP was different between treatments (P&lt;0.05) in the last four weeks of observation. In this time, the COM birds laid 17 to 24% more than CAS birds. The EW produced by birds from the COM group (59.1 to 60.7 g) was greater (P&lt;0.05) than that of the CAS birds (55.0 to 57.0 g). In the second half of the study period, a lower EM (P&lt;0.05) was observed in the CAS treatment (24.7 to 31.8 g bird<sup>-1</sup> d<sup>-1</sup>) compared to the COM treatment (39.7 to. 41.8 bird<sup>-1</sup> d<sup>-1</sup>).</p> <p><strong>Study Implications:</strong> The results obtained are only valid for the types of concentrate evaluated and under the specified experimental conditions.</p> <p><strong>Conclusions</strong>: The homemade concentrate reduces the productive performance of hens in a cage-free system in terms of LP, EW, and EM, when compared to the commercial concentrate.</p> 2021-01-18T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1892 Fodder and Grain Yield in Native Maize (Zea mays L.) 2020-11-25T18:57:19+00:00 J.Alberto.S Escalante-Estrada jasee@colpos.mx M.T. Rodríguez-González jasee@colpos.mx Y. I. Escalante-Estrada jasee@colpos.mx <p><strong>Objective:</strong> To quantify the grain yield, biomass, crop stubble, and leaf:stalk index in seven varieties of maize (Zea mays L.), as well as the relationship between biomass, stubble, and plant height.</p> <p><strong>Design/Methodology/Approach:</strong> The process consisted in planting seven genotypes of native maize (Zea mays L.). The experimental design comprised randomized blocks with four repetitions. The plant’s height, total biomass, its accumulation in stalk, leaf, husk, cob, grain, and stubble (biomass of stalk?leaf?husk?cob) were evaluated. A variance<br />analysis, the Tukey means comparison test, and a regression analysis were applied.</p> <p><strong>Results:</strong> Significant differences were found between the native maize genotypes. Notable cases were the Ixtenco Yellow, followed in terms of biomass and stubble by the Texcoco White-Wide, then the Ixtenco White and Red. The plant height determined biomass in 67% and stubble in 77%.</p> <p><strong>Study Limitations/Implications:</strong> The tendencies found could vary depending on the native cultivars studied and their management.</p> <p><strong>Findings/Conclusions:</strong> In the study region, there are differences between native maize cultivars for the agronomic characteristics evaluated. With respect to the yield of grain, biomass, and stubble, the Ixtenco Yellow cultivar was outstanding, followed by the Texcoco White-Wide, and Ixtenco White and Red. The plant height determined biomass in 67%, and stubble quantity in 77%.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1895 Flowering Dynamics in Alfalfa (Medicago sativa L.) Based on Heat Units 2020-11-26T15:56:46+00:00 Eduardo Daniel Bolaños-Aguilar bolanos.eduardo@inifap.gob.mx Christian Huyghe bolanos.eduardo@inifap.gob.mx Javier Francisco Enríquez-Quiroz bolanos.eduardo@inifap.gob.mx <p><strong>Objective:</strong> To describe the sequential pattern of reproductive development of Medicago sativa L. (flowering dynamic) using the relation between principal floral stem nodes and accumulated growing degree day (GDD) in different environmental conditions, and to determine the use of this relationship as a predictor of the seed harvesting date.</p> <p><strong>Design/Methodology/Approach:</strong> It was carried out in random blocks and factorial arrangement of 2?5, with two repetitions. Each repetition was made up of 30 plants.</p> <p><strong>Results:</strong> The flowering dynamic followed the same pattern between varieties, with a linear relation between GDD and number of floral nodes. The year A0 was different from the years A1 and A2. Therefore, A1 with cutting, and A2 with and without cutting presented less GDD during the flowering stage. In contrast, A0 showed more GDD during this period. In the different environmental conditions, the linear curves of flowering dynamic turned erratic after the tenth floral node (300 GDD) due to a low rate of plants with more than 10 floral nodes along the principal stem.</p> <p><strong>Study Limitations/Implications:</strong> It is necessary to have a meteorological station near the alfalfa seed production site, in order to specify the GDD required for predicting the correct moment to harvest seeds.</p> <p><strong>Findings/Conclusions:</strong> The reproductive development of M. sativa presents a linear relation between the number of floral nodes and GDD, which allows the prediction of the optimal seed harvesting date, in any environmental condition present.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1893 Productive behavior of sheep fed with soy (Glycine max L.) forage 2020-11-25T19:04:24+00:00 N. Torres-Salado maamonter@hotmail.com Oscar D. García-Raymundo maamonter@hotmail.com María A. Maldonado-Peralta maamonter@hotmail.com Adelaido R. Rojas-García maamonter@hotmail.com Marco A. Ayala-Monter maamonter@hotmail.com Paulino Sánchez-Santillán maamonter@hotmail.com <p><strong>Objective:</strong> To evaluate the productive behavior of Creole sheep in the tropics fed a whole food diet that includes soybean (FS, Glycine max) fodder at different phenological stages.</p> <p><strong>Methodology:</strong> The treatments T1: control, T2: 30% (SF-56 d), T3: 30% (SF-68 d), T4: 30% (SF-85 d), T5: 30% (SF-110 d) were assigned randomly to 30 male Creole sheep (15.51±1.6 kg LW). The experiment lasted 56 d. The variables evaluated were: dry matter consumption (DMC), daily weight gain (DWG) and feed conversion (FC). The experimental design was<br />completely randomized and the averages of the treatments were compared using the Tukey test.</p> <p><strong>Results:</strong> Differences (p&lt;0.05) were found in DMC, DWG and FC. The DMC was lower (p&lt;0.05) in the control group. The DWG was higher in the animals that consumed soybean fodder compared to the control group (0.205 vs 0.121 kg d<sup>-1</sup>). The FC decreased (p&lt;0.05) 51% in T3 (SF 68 d), with respect to the control group.</p> <p><strong>Study Limitations:</strong> The nutrient contribution of soybean fodder is based on the phenological stage of the plant. Likewise, producers in the tropical region have scarce knowledge about how to incorporate it in the feeding of small ruminants.</p> <p><strong>Conclusions:</strong> The inclusion of 30% of soybean fodder at 68 d of age in a whole food diet improves the productive performance of the lambs because it increases daily weight gain and decreases feed conversion.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1897 Response of tomato varieties (Solanum lycopersicum L.) to water stress 2020-11-26T16:20:43+00:00 Delfina Salinas-Vargas ramy_20009@hotmail.com María de los Ángeles Maldonado-Peralta ramy_20009@hotmail.com Adelaido Rafael Rojas-Garcia ramy_20009@hotmail.com Andrés León-Villanueva ramy_20009@hotmail.com Perpetuo Álvarez-Vázquez ramy_20009@hotmail.com Ramiro Maldonado-Peralta ramy_20009@hotmail.com <p><strong>Background and Objectives</strong>: Water scarcity is limiting for tomato (Solanum lycopersicum L) production, due to its sensitive to drought in the different phases of development, so irrigation should be done in an optimal way; because of this, the objective was to evaluate four levels of irrigation in greenhouse tomato varieties.</p> <p><strong>Methods</strong>: A completely randomized experimental design with factorial arrangement was used and various agronomic variables, fruit quality and biomass were measured as response variables.</p> <p><strong>Results</strong>: Tomatoes were significantly affected (P?0.05) by variety factors (V), irrigation (R), and their interaction. 100% of variety P presented fruits of greater weight (122 g); while weight decreased to 84, 90, 34 and 18 g when reducing water up to 25%, in varieties Cid, P, E and C, respectively. However, in terms of yield and leaf area, 100% of the Cid variety presented the highest values, around 3.3 kg/plant and 8.6 m<sup>-2</sup>.</p> <p><strong>Conclusions</strong>: Variety c was tolerant to water stress and also does not present apical rotting (calcium deficiency) in the fruit.</p> 2021-01-11T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1902 Forage yield of Urochloa cultivars in a warm sub-humid environment 2020-11-26T17:18:22+00:00 F.J. Robles-Vega garay.jonathan@inifap.gob.mx L.D. Granados-Rivera garay.jonathan@inifap.gob.mx S. Joaquín-Cancino garay.jonathan@inifap.gob.mx G. Aguado-Lara garay.jonathan@inifap.gob.mx M.A. Rivas-Jacobo garay.jonathan@inifap.gob.mx J.R. Garay-Martínez garay.jonathan@inifap.gob.mx <p><strong>Objective:</strong> To evaluate for 10 weeks the growth of five Urochloa cultivars: Camello,<br />Cobra, Cayman, Convert 330, Mavuno and Xaraés; during the North Winds (NS), Dry<br />(DS) and Rainy (RS) seasons in a warm sub-humid environment.</p> <p><strong>Design/Methodology/Approach:</strong> The variables were crop growth rate (CGR; kg ha<sup>-1</sup> d<sup>-</sup><sup>1</sup> ) and total dry matter yield (TDM; t ha<sup> -1</sup> ); which were analyzed under a completely<br />randomized design (Tukey; p=0.05).</p> <p><strong>Results</strong>: During NS, Mavuno and Xaraés presented, on average, the highest values ??of<br />CGR (p&amp;lt;0.05), 23.7 and 19.4 kg ha<sup>-1</sup> d<sup>-</sup><sup>1</sup>, respectively. In DS the cultivars Xaraés,2<br />Convert 330, Mavuno, and Cayman presented the highest values, with 20.7 and 26.8 kg<br />ha<sup>-1</sup> d<sup>-</sup><sup>1</sup> , in week 2 and 4, respectively. During RS, in the second and fourth week of<br />regrowth, the Xaraés and Mavuno cultivars presented the highest CGR (p&amp;lt;0.05), 119.8<br />and 144.7 kg ha<sup>-1</sup> d<sup>-</sup><sup>1</sup> , on average. In the NS, the Mavuno hybrid presented the highest<br />yields (p&amp;lt;0.05) of TDM, 0.886, 1.553 and 2.156 t ha<sup> -1</sup> in week 6, 8 and 10, respectively.<br />For RS, the cultivars Camello, Cayman, Mavuno, and Xaraés presented similar yields of<br />TDM; which, on average, were 4.652, 5.312 and 6.278 t ha <sup>-1</sup> , at 6, 8 and 10 weeks,<br />respectively.</p> <p><strong>Findings/Conclusions:</strong> The cultivars Xaraés, Mavuno and Cayman presented good<br />forage potential in a warm sub-humid environment; mainly for showing greater growth<br />and accumulation of total dry matter.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1903 Critical Nitrogen and Nutritive Index in Cultivars of Cenchrus purpureus (Schumach) Morrone 2020-11-26T17:23:56+00:00 Julio Cesar Vinay-Vadillo enriquez.javier@inifap.gob.mx Javier Francisco Enriquez-Quiroz enriquez.javier@inifap.gob.mx Maribel Montero-Lagunes enriquez.javier@inifap.gob.mx Mónica Yazmín Herrera-Sotero enriquez.javier@inifap.gob.mx Sergio Iban Mendoza-Pedroza enriquez.javier@inifap.gob.mx Eduardo Daniel Bolaños-Aguilar enriquez.javier@inifap.gob.mx <p><strong>Objective:</strong> To determine and compare the parameters of the nitrogen curve and the nutritive nitrogen index of cultivars of Cenchrus purpureus with and without nitrogenous fertilization.<br /><strong>Design/Methodology/Approach:</strong> Five cultivars of C. purpureus with or without fertilization were evaluated, and the dose was 141N-43P-20K. The grass was harvested every 21 d with production of dry matter (DM) and nitrogen (N). Growth rates and Critical Nitrogen (Nc) were obtained. The negative power equation with its parameters Nc and the Nitrogen Decrease Coefficient (Cd) were used. The Nutritive Nitrogen Index (NNI) was obtained with the Nc parameter of each curve, divided by the N content of the cultivar in each sampling. The data were analyzed with a completely randomized design in a factorial arrangement of five (cultivars) and two levels of fertilization.</p> <p><strong>Results:</strong> Nc of 2.6 and a Cd of 0.65 fertilized, and 1.14 of Nc and 0.68 of Cd without fertilization, and in turn all of them supplemented the amount of N for their growth from soil. The NNI was 0.8 for the fertilized cultivars, with classification of excess and sufficient for the first 56 d.</p> <p><strong>Study Limitations/Implications:</strong> Variables to determine the availability of water and the balance of soil-plant N could further expand the knowledge of these tools.</p> <p><strong>Findings/Conclusions:</strong> Parameters obtained such as Nc and NNI help to determine nutritional status of the fodders.</p> 2021-01-06T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1927 Dark cutting in large ruminants: Effect of management and environmental factors 2020-12-31T15:52:02+00:00 Alma Alarcón-Rojo isabel_guerrero_legarreta@yahoo.com Daniel Mota-Rojas isabel_guerrero_legarreta@yahoo.com Iván García-Galicia isabel_guerrero_legarreta@yahoo.com Efrén Ramírez-Bribiesca isabel_guerrero_legarreta@yahoo.com Adriana Olmos-Hernández isabel_guerrero_legarreta@yahoo.com Isabel Guerrero-Legarreta isabel_guerrero_legarreta@yahoo.com <p><strong>Objective:</strong> This review analyzes the scientific findings on the main management and environmental factors that increase<br />the incidence of dark cuts in the carcass of water buffalo and bovine of the Bos genus.</p> <p><strong>Design/methodology/approach</strong>: Scientific articles were obtained from CAB Abstracts, Pubmed, Scopus and Google Scholar databases. The primary search was carried out on the following keywords: Antemortem stress and handling,<br />dark cut, transport, antemortem rest, fasting prior to sacrifice. Detailed searches were subsequently carried out on each<br />species.</p> <p><strong>Results:</strong> There are various stressors in handling and pre-slaughter procedures in ruminants. Stress in animals causes bodily injury and affects the quality of the meat, increasing dark cutting in the carcass.</p> <p><strong>Findings/conclusions:</strong> Management practices must be improved in the pre-slaughter stages, animal welfare must be ensured, and stressors must be avoided or reduced. These benefits will help to increase the level of welfare of the animals<br />and will avoid economic losses, due to the presence of dark cutting in the carcass.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1926 Postharvest management of Heliconia psittacorum x H. spathocircinata cv. Tropics 2020-12-31T15:21:49+00:00 Gisela Carrera-Alvarado larevalo@colpos.mx Ma. de Lourdes Arévalo-Galarza larevalo@colpos.mx Joel Velasco-Velasco larevalo@colpos.mx Lucero del Mar Ruiz-Posadas larevalo@colpos.mx Josafhat Salinas-Ruíz larevalo@colpos.mx Obdulia Baltazar-Bernal larevalo@colpos.mx <p><strong>Objetive</strong>:&nbsp; Evaluate different techniques to prolong the postharvest life of <em>&nbsp;</em><em>Heliconia psittacorum </em>x <em>H. spathocircinata</em> cv. Tropics.</p> <p><strong>Design/methodology/approach: </strong>Two experiments were carried out; in the first it was evaluated the effect of five pulse solutions [(T1 = control (water); T2 = Hydraflor<sup>®</sup> 100 (0.5 g L<sup>-1</sup>); T3 = Hydraflor<sup>®</sup> 100 (0.5 g L<sup>-1</sup>) + sucrose (5% w/v); T4 = salicylic acid (1mM) and T5 = salicylic acid (1mM) + sucrose (5% w / v)] prior to storage at 11 ° C and 85 % RH for 10 d. In the second experiment, a wax coating was applied to the heliconia bracts and then maintain at 13 °C and 84% RH for 10 d; after storage the stems were placed in water or salicylic acid solution (1 mM). The results were analyzed by a completely randomized design, 10 replicates were used per treatment, one stem was one experimental unit. An ANOVA and a means comparison test (Tukey, ?=0.05) were performed with the SAS version 9.4.</p> <p><strong>Results:</strong> The anatomy of heliconia stems determines their vase life, since they have wide xylem vessels susceptible to cavitation, for which the absorption of water is limited, also and non-functional stomata in the bracts, which increase the loss of moisture from the tissue. The use of pulse solutions or preservatives has little effect in prolonging the life of heliconia stems. Therefore, the application of wax creates a physical barrier that maintains the turgor of the stems, reduces oxidation, maintaining the bracts quality and increased the total postharvest life for 6 d more than the control stems.</p> <p><strong>Study limitations/implications:</strong> No limitations were found in this study</p> <p><strong>Findings/conclusions: </strong>The postharvest life of heliconia is conditioned by the loss of turgor and low water absorption, which leads to an early wilting of the inflorescences. The application of pulse solutions or preservatives have little effect in prolonging the life of the vase, so the most suitable technique to preserve the quality of the stems is waxing.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1896 Yield, Agronomic Characteristics and Chemical Composition of Silage Fodder (Sorghum bicolor L.) With and Without Fertilization 2020-11-26T16:04:44+00:00 Gerardo Analco-Cisneros rogarcia@uagro.mx María de los Á. Maldonado-Peralta rogarcia@uagro.mx Paulino Sánchez-Santillán rogarcia@uagro.mx María B. Bottini-Luzardo rogarcia@uagro.mx José L. Valenzuela-Lagarda rogarcia@uagro.mx Adelaido R. Rojas-Garcia rogarcia@uagro.mx <p><strong>Objective:</strong> To evaluate the yield and structural characteristics of sorghum fodder, as<br />well as the chemical quality of the fodder and the silage with and without fertilization.</p> <p><strong>Design/Methodology/Approach:</strong> The evaluated variables were, in the fodder: dry<br />matter yield (DMY, kg ha -1 ), leaf:stalk ratio (L:S, g g -1 ), plant height (H, cm) and<br />intercepted radiation (IR, %); and in the silage: dry matter (DM, %) crude protein (CP,<br />%), neutral detergent fiber (NDF, %), acid detergent fiber (ADF, %), lactic acid (LA,<br />%) and pH. There were two treatments, with fertilization and without fertilization.</p> <p><strong>Results:</strong> The agronomic characteristics L:S, H and IR improved with fertilization<br />(P&amp;lt;0.05). The DMY with fertilization was 7060 kg DM ha -1 and without fertilization, it<br />was 5472 kg DM ha -1 . The values of DM, CP, NDF, ADF and LA of the silage with<br />fertilization were 33.60, 7.83, 51.06, 28.51 and 4.51%, respectively, and the pH was<br />4.3, and without fertilization these values were 47.67, 5.83, 43.36, 25.21 and 2.86%,<br />respectively, and the pH was 4.66; all values were different when comparing with and<br />without fertilization (P&amp;lt;0.05).Study Limitations/Implications: These quality parameters should continue to be<br />studied in sorghum silages and with different fertilization doses to expand the<br />decision outlook.<br /><strong>Findings/Conclusions</strong>: According to the results obtained, it is concluded that the<br />sorghum fodder crop should be fertilized for the ensilage, since higher dry matter<br />yield, better agronomic, and nutritional characteristics are obtained.s</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1898 Productive Performance of Alfalfa (Medicago sativa L.) at Different Age of Resprout in the Spring Season 2020-11-26T16:50:57+00:00 Perpetuo Álvarez-Vázquez juan.encinad@uaaan.edu.mx Juan Antonio Encina-Dominguez juan.encinad@uaaan.edu.mx Joel Ventura-Rios juan.encinad@uaaan.edu.mx Armando Hernández-Perez juan.encinad@uaaan.edu.mx Alberto Flores-Naveda juan.encinad@uaaan.edu.mx Ramiro Maldonado-Peralta juan.encinad@uaaan.edu.mx <p><strong>Objective</strong>: To determine the growth and productive performance curves, to obtain the optimal cutting moment in alfalfa, depending on the age of resprouting, in the Spring season.<br />Design/Methodology/Approach: The treatments were cuts at different age of the plant and the variables evaluated: Dry Matter Yield (DMY) Botanical and Morphological composition (BMC), Plant Height (PH), Leaf/Stem Ratio (L/SR), and Intercepted Radiation (IR). The stastical analysis was with the PROC GLM procedure, of the SAS software, and the adjusted<br />curves were obtained with the Curve Expert Professional 2.0 software.<br /><strong>Results:</strong> There was an increase in the DMY, leaf, stem, PH, and IR, as the resprouting age advanced, but not, the L/SR which had an inverse behavior. The maximum DMY was obtained (4,768 kg DM ha<sup>-1</sup>) in week seven. There was a greater amount of leaf with average 52%, followed by the stem (36%), weeds (7%), detritus (4%) and inflorescence (1%). The PH washigher in week seven with 53 cm. Likewise, the highest IR in week tree with 86%. However, the L/SR was higher in week one with 2.4. The IR and L/SR presented the lowest R2 (0.90 and 0.93, respectively). In contrast, DMY and PH presented a<br />positive relationship (R2 of 0.98 and 0.97, respectively).<br /><strong>Study Limitations/Implications:</strong> There were no limitations<br /><strong>Findings/Conclusions:</strong> The productive performance of Premium variety alfalfa was variable depending on the resprouting age, in which the botanical and morphological characteristics changed, with better characteristics in the fifth week</p> 2021-01-11T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1900 Effect of a Fungi Complex in Nine Ecotypes of Cenchrus purpureus (Schumach) Morrone 2020-11-26T17:04:52+00:00 Primavera Pérez-Ramos yuri.va@voaxaca.tecnm.mx Yuri Villegas-Aparicio yuri.va@voaxaca.tecnm.mx Rigoberto Castro-Rivera yuri.va@voaxaca.tecnm.mx Ernesto Castañeda-Hidalgo yuri.va@voaxaca.tecnm.mx Aarón Martínez-Gutiérrez yuri.va@voaxaca.tecnm.mx Gisela Margarita Santiago-Martínez yuri.va@voaxaca.tecnm.mx <p><strong>Objective:</strong> The objective of this study was to evaluate the response of different concentrations of a fungal consortium on the growth and yield of Cenchrus purpureus ecotypes under storm conditions.<br /><strong>Design/Methodology/Approach:</strong> An experiment was established under a completely randomized design with a 9<em>X</em>2<em>X</em>4 factorial arrangement. The factors were 9 ecotypes of Cenchrus purpureus, two seasons of the year (Summer-Fall and Winter-Spring), and four levels of mycorrhizal consortium. The variables evaluated were: number of buds, number of leaves, height of the bud, leaf length, total biomass, and leaf-stalk ratio.<br /><strong>Results:</strong> The response of the ecotypes had a differential effect on the variables NB, LLL, TB and L/SR, while the season affected the variables LN, PH, LLL, MLL, SLL, TB and L/SR. Low inoculation levels increased the variables NB, PH, LLL, MLL and TB.<br /><strong>Study Limitations/Implications:</strong> The evaluated factors indicate that the level of inoculant and the season determine the growth and yield of Cenchrus purpureus.<br /><strong>Findings/Conclusions:</strong> The mycorrhizal consortium dose and season of the year mainly determined the growth and yield of C. purpureus. Ecotypes respond differently to changes in the season and in mycorrhizal consortium dose. The evaluated factors indicate that the mycorrhiza dose and the season of the year determine the growth and yield of C.<br />purpureus. Two growth strategies of the ecotypes are visualized: 1) many buds, with few small leaves and 2) few buds with many large leaves</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1894 Size, imbibition, and viability of seeds of two creole melon (Cucumis melo L.) from the state of Guerrero, Mexico 2020-11-25T19:12:13+00:00 José L. Escobar-Álvarez joseluislagarda@uagro.mx Omar Ramírez-Reynoso joseluislagarda@uagro.mx Paulino Sánchez-Santillán joseluislagarda@uagro.mx Rocío Cuellar-Olalde joseluislagarda@uagro.mx Teolincacíhuatl Romero-Rosales joseluislagarda@uagro.mx José L. Valenzuela-Lagarda joseluislagarda@uagro.mx <p><strong>Objective:</strong> To determine the physical and physiological characteristics of Creole melon seeds from the Costa Chica ofGuerrero.<br /><strong>Design/Methodology/Approach:</strong> It was established under a completely randomized design, and Student’s t-tests (<em>a=</em>0.05) and correlation with Pearson’s test were performed. Viability and imbibition were carried out using the methodologies described by the International Seed Testing Association (ISTA).<br /><strong>Results:</strong> Creole seeds of the two varieties presented a significant statistical difference (95% confidence level) in the physical quality variables. The imbibition ended at 18 and 32 h in V2 and V1, respectively, after being submerged in water. The humidity percentage was higher in V1 (7.19); while, V2 presented a higher percentage of germination and viability (96 and 90%, respectively). There is a positive association between the humidity and the physical dimensions of the seed and the germination and viability (r<sup>2</sup>=0.954) that is highly significant (P=0.003).<br /><strong>Study Limitations/Implications</strong>: Morphological and taxonomic classification studies of the Creole genotypes of the Costa Chica region of Guerrero are required.<br /><strong>Findings/Conclusions</strong>: There was a positive correlation between the physical and physiological quality of the Creole melon seeds.</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad http://revista-agroproductividad.org/index.php/agroproductividad/article/view/1901 Effect of plant growth-promoting bacteria and inoculation media in the yield on cooksfoot yield 2020-11-26T17:11:47+00:00 G. Aguilar-Benítez rcastror@ipn.mx R. Castro-Rivera rcastror@ipn.mx Y. Villegas-Aparicio rcastror@ipn.mx M. M. Solís-Oba rcastror@ipn.mx J. A. Pacheco-Ortíz rcastror@ipn.mx J. A. Villarreal-González rcastror@ipn.mx <p><strong>Objective:</strong> To determine the effect of three PGPB bacteria (Ewingella americana, Bacillus simplex and Microbacterium ginsengiterrae) and three inoculation media (digestate, compost and cornstarch) on plant height, leaf temperature, stalk<br />density, morphological composition, and dry matter yield of orchard grass.<br /><strong>Design/Methodology/Approach</strong>: A completely randomized design was used, with a factorial arrangement 4<em>X</em>3, the experimental units being a pot with five initial stalks.<br />Results: The dry matter did not show difference between treatments with bacteria (P&gt;0.05), but the control the values increased up to 50%. Compost and digestate media outperformed cornstarch by 22%. The inoculation media had an effect<br />(P?0.05) on the yield and leaf variables, while the bacteria promoted the formation of new stalks and the production of biomass, and reduced the leaf temperature.<br />Findings/Conclusions: Compost and digestate as inoculation media can notably favor the beneficial effect of M. ginsengiterrae, which was the one that registered the best yields</p> 2021-01-04T00:00:00+00:00 Derechos de autor 2020 Agro Productividad