二氯喹啉酸在稻田水、土壤和作物中残留动态研究

二氯喹啉酸为高效、低毒新型除草剂，在天津和吉林２年２地水田残留实验结果表明，此药在田水和茎叶中消解很快。二氯喹啉酸在田水中的半衰期分别为０．８ｄ（天津）和２ｄ（吉林）。在茎叶中的半衰期小于１ｄ。该农药在土壤中残留较低，消解较快，半衰期约为６ｄ；在土肿未检出二氯喹啉酸代谢物，按推荐剂量４２１．５－５２５ｇ／ｈｍ＾２，施药１次，施药间隔期为９６－１０５ｄ，糙米中二氯喹啉酸残留量均小于０．００５ｍｇ／ｋ

The Dissipation and Residue of Quinclorac in Rice Field water,Soil and Rice Plant

Quinclorac is a new herbicide with high efficiency and low toxicity.The field experiments were carried out both in Tianjin and Jinn Province in 1993 and 1994, respectively. It has been found that the herbicide dissipated rapidly from water and leaves. Its half life values in the water was 0.8 days in Tianjin and 2 days in Jinn, and the half life in rice leaves was less than 1 day.The residure in sediment remained quite low during 6 days of half life. No metabolite was detected in soil.Applied to rice field as a 50% WP formulation at the recommended rates of 412.5g-525 g/hm2,one application,preharvest interval 96-105 days,the residue remaining in unpolished rice was less than 0.005 mg/kg,far below MRL,and was safe to humanbeing.