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用不同浓度的多效唑液在不同育秧阶段处理杂交晚稻秧苗，探讨其对秧苗高度、发根、出叶数、秧苗叶片、分蘖、成穗及对产量的影响，结果表明：播后踏谷或出笛后一叶一心时用质量分数为0．03％的多效唑液处理秧苗，能明显矮化秧苗，增加秧苗叶片数和绿叶片数，增大主茎茎基宽，秧苗带2＃及3＃以上的比例高，抗逆性强；大田分蘖早，成穗率高，与对照间的产量差异达极显著水平。拌种处理与对照间的产量差异有5％水平上的显著性。
The effects of Paclobutrazol at different growth stages on late hybrid rice seedlings were studied with different concentrations of Paclobutrazol. The effects of Paclobutrazol on seedling height, hairy roots, number of leaves, seedling leaves, tillers, ear and yield were studied. The results showed that: Flute after a leaf heart with mass fraction of 0.03% Paclobutrazol treatment of seedlings, can significantly dwarf the seedlings, increase the number of seedlings leaves and green leaves, increasing the stem base width, seedlings with 2 # and 3 # Above the proportion of high, strong resistance; field tillering early, into a high rate of spike, with the yield difference between the control reached an extremely significant level. The difference in yield between seed dressing and control was 5% level significance.