Institute of Pesticide and Environmental Toxicology, The Key Laboratory of Molecular Biology of Crop Pathogens and Insects, College of Agricultural and Biotechnology, Zhejiang University, Hangzhou, China.
Pest Manag Sci. 2022 Aug;78(8):3287-3293. doi: 10.1002/ps.6953. Epub 2022 May 16.
The 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.
The herbicidal activity of atrazine to barnyard grass varied greatly among the tested soils with the medium inhibition concentration (IC ), based on the amended concentration, ranging from 1.07 to 10.91 mg kg . 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 in in situ pore water (C ). Comparable IC values ranging from 1.14 to 1.38 were obtained from C in the tested soils with much smaller variation coefficient compared to those based on the traditional concentration (C ) of this herbicide in soils determined by extraction with organic solvents.
The concentration of atrazine in in situ pore water could be reliable to evaluate its bioavailability and herbicidal activity to barnyard grass. C of a herbicide in soil could be an indicator for guiding the practical application rate. © 2022 Society of Chemical Industry.
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性的影响。了解除草剂功效与土壤特性之间的关系，可以为根据当地条件应用除草剂提供决策依据。本研究旨在探讨土壤特性对莠去津作为稗草模型除草剂除草活性的影响，从而找到评估除草剂对杂草除草活性的指标。
莠去津对稗草的除草活性在供试土壤中差异很大，基于修正浓度的中浓度抑制浓度（IC ）范围为 1.07 至 10.91mgkg 。稗草对莠去津的吸收与莠去津在土壤中的吸附呈负相关，而与原位孔隙水中莠去津的浓度（C ）呈正相关。在所测试的土壤中，从原位孔隙水中获得的可比 IC 值范围为 1.14 至 1.38，与传统浓度（C ）相比，其变异系数小得多，传统浓度是通过用有机溶剂提取来确定土壤中该除草剂的浓度。
原位孔隙水中莠去津的浓度可以可靠地评估其对稗草的生物利用度和除草活性。土壤中除草剂的 C 值可以作为指导实际应用率的指标。 © 2022 化学工业协会。
