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制种和繁殖田,在抽穗前期喷施“920”,对提高制种和繁殖田的产量,有着明显的增产作用.这是众所公认的.但是,在制种、繁殖田中喷施不同量的“920”,有着不同的副作用,却被人们所忽视. 我们1984年在喷施不同量“920”的制种试验田里和1984、1985年在大面积制种、繁殖田中调查,发现制种和繁殖田喷施不同量的“920”,对稻粒黑粉病和叶鞘腐败病有明显的诱发作用.用量越高,诱发作用越大,病害越严重.对种子后代(F_1)的发芽率有着
Seed production and breeding fields, sprayed in the pre-heading “920”, in order to improve the production and breeding fields yield, it has been recognized that the production, but in the breeding field sprayed with different amounts Of the “920”, have different side effects, but people ignored .In 1984 we sprayed a different amount of “920” in the field trial production and in 1984, 1985, large area in the field, breeding field investigation found that seed production Spraying different amount of “920” on the field and the breeding field could obviously induce the powdery mildew of rice and the sheath rot of the leaf sheath.The higher the dosage, the greater the inducing effect and the more serious the disease.The germination rate of F_1 have