丁草胺对水稻安全性影响的研究

Study of butachlor on safety in early stage of rice

通过盆栽试验,探讨了丁草胺施药剂量、施药时期、施药时的水层深度等对水稻株高和产量的影响。初步明确了不同水稻品种对丁草胺的敏感性不同,试验中的东农419水稻对丁草胺的敏感性高于绥粳4号。同一品种在相同条件下随着丁草胺用药剂量的增加对水稻生长发育的影响程度明显增大,用量为2 328.75 ga.i.·hm-2时对水稻的株高和产量的影响明显高于1 215,1 012.5 ga.i.·hm-2,而且缓苗后施药对水稻的安全性高于缓苗前,施药时水层深度没过心叶时比正常水层深度更容易产生药害。但这些影响是可恢复的,恢复时间需要20 d左右。

The experiment discussed, the effect of butachlor with application dosage, application date and depth of water layer on height and yield with potted rice. The trial result indicated the sensitivity of the rice species to butachlor was different, the sensitivity of Dongnong 419 is higher than that of Suijing 4. The effects was more obvions in the same rice variety with the increase of application dosage. The damage under the dosage 2 328.5 ga.i·hm^-2 was clearly higher than that of 1 215 and 1 012.5 ga.i.·hm^-2 the safety to the paddy rice in 7 days after cultivated was higher than the 2 days after cultivated; the water layer depth that did not lead the heart leaf compared to the normal water layer depth produced the phytotoxicity more easily. But these influences were resumable, the recovering time was about 20 days.