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新型植物生长调节剂—多效唑对连作晚稻秧苗有明显的控长效应,于一叶一心期施用300ppm多效唑,控长率可达30％左右,有效期为4～5周。多效唑的控长效应与相对低温对苗高的影响相似,对稻苗各器官均有控长效应,对主茎的控长率高于分蘖,对叶挺(假茎)与叶片的控长率相似。经多效唑处理的稻苗为矮健壮秧,株型较对照紧凑,
The new plant growth regulator, paclobutrazol, has obvious long-term control effect on late-season rice seedlings. The application rate of 300 ppm paclobutrazol is up to 30% and the effective period is 4 to 5 weeks. The control effect of paclobutrazol was similar to the effect of relative low temperature on seedling height. It had long-term effect on the organs of rice seedlings, and the control rate of main stem was higher than that of tillers. The control rate of Ye Ting (pseudostems) and leaves was similar . The paclobutrazol-treated rice seedlings are short sturdy seedlings, plant type compact than the control,