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一叶一心期（以下简称苗期）珍汕９７Ａ、协青早Ａ１ｈｍ２分别喷施多效唑（简称ＭＥＴ）０．９、１．２ｋｇ，各对水４５０ｋｇ，能有效地促进其秧苗分蘖，提高秧苗素质；１ｈｍ２分别增加有效穗３７．２万、８５．５万；分别提高柱头外露率５．１％、３．６％；提高结实率５．６％、４．９％；分别增产３６．３％、４９．１％。在水稻幼穗分化３～７期，１ｈｍ２制种田对明恢６３、２ＤＺ５７喷施０．９～１．５ｋｇＭＥＴ，对水４５０ｋｇ，能延迟始穗１～２ｄ；对珍汕９７Ａ、协青早Ａ１ｈｍ２喷施１．３５～２．７ｋｇＭＥＴ，对水４５０ｋｇ，能延迟始穗１～３ｄ。ＭＥＴ剂量越大，延迟始穗效果越好。但恢复系施用大剂量后株高降低过多，授粉态势差；而不育系株高降低，则在一定程度上改善了授粉态势。
One leaves per leaf period (hereinafter referred to as seedling) Zhenshan 97A, Xieqingzao A1hm2 were sprayed paclobutrazia (MET) 0.9,1.2kg, each pair of water 450kg, which can effectively promote the tillering of its seedlings and improve the quality of seedlings ; 1hm2 increased 372,000 and 855,000 effective spikes respectively; stigma exserted rate increased by 5.1% and 3.6% respectively; increased seed setting rate by 5.6% and 4.9%; increased yield by 36.3% , 49.1%. In panicle stage 3 to 7, 1hm2 farming could spray 0.9 ~ 1.5kgMET on Minghui 63 and 2DZ57, and 1 ~ 2d on water 450kg, while on Zhenshan 97A and Xieqingzao A1hm2 Spraying 1.35 ~ 2.7kgMET, water 450kg, can delay the beginning of the ear 1 ~ 3d. The greater the dose of MET, the better the delayed ear initiation. However, after the high-dose restoration, the plant height decreased too much and the pollination status was poor. However, when the plant height was decreased, the pollination status was improved to a certain extent.