颍上县水稻肥药双控示范田出现“张口瘪”病症的成因分析

Cause Analysis of the Disease 'Flat Mouth'in the Rice Demonstration Field of Using Fertilizer and Pesticide Twice in Yingshang

通过对水稻肥药双控示范田的"张口瘪"病症发病特点调查,分析了导致"张口瘪"病症的几种可能原因。提出导致"张口瘪"病症可能是连年使用氯磺隆、甲磺隆造成的残留药害;或是因为土壤中的硫、砷比例失调,硫元素相对不足,重金属砷的活性加强,引起水稻砷中毒。

The disease characters of ‘flat mouth＇ were investigated in the rice demonstration field where the fertilizer and pesticide were used twice in Yingshang, and the reasons were analyzed. The possible reasons were as follows： （ 1 ） The residual phytotoxieity caused by using chlorsulfuron and metsulfuron-methyl in successive years. （2） The rice arsenic poisoning caused by the disproportion between Sulfur and Arsenic in soil, and the relative shortage of Sulfur and the strengthening activity of Arsenic.