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Decay of Quinclorac in Acidic Paddy Soil and Risk Evaluation to the Subsequent Crop, Tobacco (Nicotiana Tabacum L.)

Decay of Quinclorac in Acidic Paddy Soil and Risk Evaluation to the Subsequent Crop, Tobacco (Nicotiana Tabacum L.)

Qiuzan Zhong, Shuqing Wan, Changyou Shen, Yi Liu

Bull Environ Contam Toxicol. 2018 Aug;101(2):284-287.

PMID: 29947913

Abstract:

Quinclorac is a selective herbicide commonly used in China to control monocotyledonous weeds in paddy fields. A field experiment was conducted to quantify the environmental behavior of quinclorac in acidic paddy soil under rice (Oryza sativa L.) field conditions, and to evaluate the risk of its residues to the subsequent crop of tobacco (Nicotiana tabacum L.). Rice was sprayed once with quinclorac 50% WP at 562.5, 375.0, or 187.5 g a.i. ha-1 at 7 days after transplanting the seedlings. Decay of quinclorac in paddy field soil followed first-order kinetics, with a half-life of 28.29-30.27 days. At harvest time, 0.090, 0.074 and 0.034 mg kg-1 of quinclorac were found in soils following the above-described treatments, respectively. Leaves of the subsequent crop, tobacco, sown the year after the quinclorac treatments, exhibited different dose-dependent degrees of visible phytotoxicity symptoms.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS353802	Herbicides - WP			Price

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