Herbicidal activity of atrazine to barnyard grass depends upon soil characteristics
Herbicidal activity of atrazine to barnyard grass depends upon soil characteristics
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DOI：
10.1002/ps.6953
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发表时间：
2022-05-16
影响因子：
4.1
通讯作者：
Yu，Yunlong
中科院分区：
文献类型：
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作者：
He，Shuhong;Lang，Hongbin;Yu，Yunlong
背景技术作为土壤处理剂的除草剂的功效可能在很大程度上受到土壤特征的影响。了解除草剂药效与土壤特性的关系，可为除草剂的因地制宜应用提供决策依据。以阿特拉津为模型除草剂，研究了土壤性质对阿特拉津除草活性的影响，并以此为基础建立了评价除草剂除草活性的指标。结果表明，阿特拉津对稗草的除草活性在供试土壤中差异很大，以修正浓度为基础，范围为1.07至10.91 mg kg−1。稗草对阿特拉津的吸收与其在土壤中的吸附量呈负相关，而与土壤孔隙水中阿特拉津的浓度呈正相关。结果表明，用CIPW法测得的除草剂对供试土壤的IC_（50）值在1.14 ~ 1.38之间，与传统的有机溶剂萃取法测得的土壤中莠去津浓度（Csoil）相比，变异系数小得多。除草剂在土壤中的CIPW可作为指导实际施用量的指标。© 2022化学工业学会。
BACKGROUNDThe efficacy of a herbicide as soil treatment agent may be largely affected by soil characteristics. Understanding the relationship between herbicide efficacy and soil characteristics can provide decision basis for herbicide application according to local conditions. This study was aimed towards exploring the effect of soil characteristics on herbicidal activity of atrazine as a model herbicide to barnyard grass and thus to find an indicator for the herbicidal activity assessment of a herbicide against weeds.RESULTSThe herbicidal activity of atrazine to barnyard grass varied greatly among the tested soils with the medium inhibition concentration (IC50), based on the amended concentration, ranging from 1.07 to 10.91 mg kg−1. Uptake of atrazine by barnyard grass was negatively correlated with its adsorption onto soils, whereas it was positively related to the concentration of the herbicide inin situpore water (CIPW). Comparable IC50values ranging from 1.14 to 1.38 were obtained from CIPWin the tested soils with much smaller variation coefficient compared to those based on the traditional concentration (Csoil) of this herbicide in soils determined by extraction with organic solvents.CONCLUSIONThe concentration of atrazine inin situpore water could be reliable to evaluate its bioavailability and herbicidal activity to barnyard grass. CIPWof a herbicide in soil could be an indicator for guiding the practical application rate. © 2022 Society of Chemical Industry.