期刊
MOLECULES
卷 20, 期 1, 页码 1161-1175出版社
MDPI
DOI: 10.3390/molecules20011161
关键词
degradation dynamics; residue; glyphosate; soil properties; HPLC
资金
- Zhejiang Provincial Natural Science Foundation of China [R13C140001, LY14C140005, Y3090150]
- National Natural Science Foundation of China [31371904]
- Zhejiang Provincial Project [2014C32010]
- Fundamental Research Funds for the Central Universities
- Agricultural Ministry of China [nyhyzx 201303015, 201003029, 201003066]
- Key Subject Construction Program of Zhejiang for Modern Agricultural Biotechnology and Crop Disease Control [2010DS700124-KF1101, 2010DS700124-KF1203, 2010DS700124-KF1309, 2010DS700124-KF1410]
Glyphosate formulations that are used as a broad-spectrum systemic herbicide have been widely applied in agriculture, causing increasing concerns about residues in soils. In this study, the degradation dynamics of glyphosate in different types of citrus orchard soils in China were evaluated under field conditions. Glyphosate soluble powder and aqueous solution were applied at 3000 and 5040 g active ingredient/hm(2), respectively, in citrus orchard soils, and periodically drawn soil samples were analyzed by high performance liquid chromatography. The results showed that the amount of glyphosate and its degradation product aminomethylphosphonic acid (AMPA) in soils was reduced with the increase of time after application of glyphosate formulations. Indeed, the amount of glyphosate in red soil from Hunan and Zhejiang Province, and clay soil from Guangxi Province varied from 0.13 to 0.91 mu g/g at 42 days after application of aqueous solution. Furthermore, the amount of glyphosate in medium loam from Zhejiang and Guangdong Province, and brown loam from Guizhou Province varied from less than 0.10 to 0.14 mu g/g, while the amount of AMPA varied from less than 0.10 to 0.99 mu g/g at 42 days after application of soluble powder. Overall, these findings demonstrated that the degradation dynamics of glyphosate aqueous solution and soluble powder as well as AMPA depend on the physicochemical properties of the applied soils, in particular soil pH, which should be carefully considered in the application of glyphosate herbicide.
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