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Keywords
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Abstract
Objective: To evaluate the effect of paraffin oil and a mixture of oil-soluble surfactants (APMT) and vegetable oil plus polyalkylene oxide siloxane (ASOP) as adjuvants to potentiate herbicides for the control of Melochia nodiflora and Cynodon sp. in corn crops.
Design/methodology/approach: Synthetic chemical herbicides and a bioherbicide were used, with three replicates, at doses of 50 and 100 %, with or without one of the two adjuvants under study. The design was a randomized complete block with a factorial arrangement, where: A (herbicides) had seven levels, B (adjuvants) had four levels and C (evaluation dates) had eight levels, each block consisted of an area of 12 m2. The evaluation was carried out every week using the scale proposed by the EWRS. The results were handled in terms of percentage and a data adjustment was performed using the arcsine. A 3-factor factor analysis (AxBxC) and a comparison of means test with Tukey (α ≤ 0.05) were performed using SAS software.
Results: In factor A, the greatest control effects corresponded to glyphosate, BH2 (bioherbicide), and dicamba + atrazine, with an average of 77.93, 66.30, and 54.91%, respectively. In factor B, the highest results were obtained with 50% doses of the herbicides plus adjuvants, mainly with APMT and then ASOP with 55.85 and 43.20% control, respectively. For factor C, the treatments showed their greatest effectiveness during the third evaluation, 21 days after application.
Limitations on study/implications: The study reveals the opportunity to improve the control of the weeds under study in corn crops, and to seek alternatives to the use of glyphosate.
Findings/conclusions: The use of paraffin oil and a mixture of oil-soluble surfactants improved the effect of herbicides (at a dose of 50%) for weed control, such as: ammonium glufosinate, dicamba + atrazine, carfentrazone ethyl and glyphosate; where it stood out when using dicamba + atrazine, instead the use of vegetable oil plus polyalkylene oxide siloxane improved the effect of 2,4-D + carfentrazone ethyl and BH2.