叶枯灵在水稻上残留动态研究

STUDY ON RESIDUAL DYNAMICS OF NEW PESTICIDE S-7802 IN RICE

本文报道叶枯灵在水稻上的残留消解动态。结果表明,叶枯灵在水稻及稻田生态环境中消解较快,施药后7—9d在水稻上的半衰期约2d,在田土及田水中半衰期分别为2.5d与1.31d;在水稻上总的残留变化规律随着施药剂量、施药次数的增加及距收割期的缩短而上升。根据常规药效试验推荐最高用量4.5kg/ha(1000mg/kg)使用三次,距水稻收割期为21d,在糙米的最大残留未超过0.5mg/kg。

The residual dynamics of S-7802 pesticide in rice and paddyfield was studied in Sichuan during 1988-1990. The results showed that S-7802 pesticide degraded rapidly in rice and paddy field and more than 90 %was degraded within 7 to 9 days after application with rate of 100 g a. i/mu. Thehalflife of S-7802 degradation was 2 days in rice. The maximum of s-7802 residue in rice was less than 0. 5 ppm used at 75 g a. i. /mu for 1 to 3 timesduring the experiments periods.