Residual Herbicides and Cover Crops Interactions for Soybean Weed Control

Abstract

Residual herbicides and cover crops are important tools inside an integrated weed management program. The straw produced in crop rotation can interacts with herbicides. The aim of this study was to evaluate the interaction of diclosulam, sulfentrazone, imazethapyr, flumioxazin, s-metolachlor and pyroxasulfone with black oat, cereal rye, common vetch and oilseed radish cover crops and it´s reflection on weed control and soybean production. Were evaluated the biomass production of cover crops and its influence on the soybean population. A phytosociological survey of the weed community was carried out, further evaluating the control provided by the herbicides and its effects on soybean productivity. Diclosulam was the more efficient herbicide tested, reducing both weed density and biomass (68% and 89%, respectively) compared to the fallow, independently of cover crop straw. The best control levels for the population identified were provided by the combination of the herbicides diclosulam with black oat, radish or fallow. We observed that herbicide efficacy in this case was more related with control spectrum than with herbicide-straw interation. This research demonstrates that the integration of cover crops and residual herbicides is efficient in the suppression and control of weeds in the soybean crop in the no-tillage system.

Photosynthetic Efficiency and Antioxidative Response of Soybean Exposed to Selective Herbicides: A Field Study

“…Commercial post-emergence herbicides for the protection of agricultural crops from weeds are nowadays an essential way to ensure optimal growth and yield of soybean crops [28]. Although weed control management uses methods and active substances that usually do not influence the growth of non-target species, herbicide application is reported to have an influence on agricultural crops [28,[45][46][47]. Based on Croatian legislation, the last treatment with the recommended combination of herbicides should be by the end of the emergence of the third trefoils (V3) and before the emergence of the flowers (R1).…”

“…Despite that, non-targeted species usually have tolerance to specific herbicides due to their fast-metabolic degradation [50][51][52]. Moreover, several recent investigations confirmed that herbicide treatments have little or no effect on final yield production of soybeans [47,[53][54][55][56].…”

Shortening critical period of weed control at soybean by residual herbicide mixtures

“…In other studies, the control provided by straw and application of pre-emergent herbicides was enough to ensure maximum soybean productivity, even without other interventions in the post-emergence of the crop. In this area, with a weed community mostly composed of monocot species, no (Duarte et al, 2021;Roncatto et al, 2022).…”