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多效唑用于杂交稻制种秧苗（２叶１心）期能矮化秧苗，增加单株分蘖，提高秧苗素质；用于调节花 期，能有效控制幼穗发育；用于成熟期能降低穗头芽谷率．
Paclobutrazol is used in the hybrid rice seedling (2 leaves 1 heart) period can dwarf the seedlings, increase individual tillers, improve seedling quality; used to regulate flowering, can effectively control the development of young ears; Valley rate.