期刊
EXPERIMENTAL AGRICULTURE
卷 56, 期 6, 页码 781-793出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0014479720000290
关键词
Paraquat; Diquat; Glufosinate-ammonium; Glyphosate; Food contaminants
类别
Cowpea bean (Vigna unguiculata) is usually submitted to pre-harvest burndown with herbicides aiming to an early harvest. We aimed to quantify the residues of paraquat, diquat, glufosinate-ammonium and glyphosate in cowpea grains subjected to two timings of pre-harvest burndown. Three identical experiments were installed in Dourados (Lat. 22 degrees S), Sinop (Lat. 11 degrees S) and Teresina (Lat. 05 degrees S), Brazil, comprising the pre-harvest burndown of cowpea bean with these herbicides, applied either with 50 or 75% of the pods dry and ready for harvest. As hotter and drier the location as slower the herbicide dissipation. Glyphosate should not be used for pre-harvest burndown of cowpea. Herbicide residues were above the maximum levels stated by the Brazilian legislation when applied with 50% dry pods. Burndown herbicides aiming to speed harvest should be applied with at least 75% dry pods in cowpea to ensure safe herbicide residue levels in grains.
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