Residual herbicides applied to common bean cultivars on maize yield in succession

Abstract

Given the introduction of increasingly productive and early maturing maize cultivars over the past decade, coupled with the restricted availability of herbicides for controlling eudicots weeds in common bean crops, leading producers have resorted to using mixtures of active ingredients. Consequently, there arises a necessity for studies to assess the carryover effects of these mixtures in succession crops. The objective of this study was to evaluate the residual effect of herbicides applied in common bean cultivars on maize, during two cultivation periods. The statistical design was a randomized complete block with four replications. The common bean cultivars BRS Pérola, IPR Tuiuiú, and BRSMG Marte were planted in the summer season 2016/2017 and in the winter season 2017, and subsequently, the maize DKB 390PRO was planted in the winter season and summer season, respectively. The experimental plots were treated with herbicides applied post-emergence, isolated or mixed, at the following rates [g a.i. ha-1]: fomesafen [250]; fomesafen [375]; bentazon + imazamox [600+28]; bentazon + imazamox + fomesafen [(600+28)+125]; and bentazon + imazamox + fomesafen [(600+28)+87.5]; and hand weeding without herbicide. The herbicides did not cause negative effects on maize yield, regardless of the sowing period and common bean cultivar.

Keywords

• Zea mays L.
• Carryover
• Sowing period