神力素施用剂量小于４．５ｋｇｈｍ－２时，随着施用剂量的提高，杂交水稻制种产量也随之增加；在相同用量下，分２次使用比１次使用效果好．本试验条件下，以破口２０％用神力素１．５ｋｇｈｍ－２，破口７０％再用３．０ｋｇｈｍ－２增产效果最佳．神力素对产量的影响主要是通过促进不育系解除包颈，提高柱头外露率、午前花比例和结实率而发挥作用 When the dosage of divin was less than 4.5kghm-2, the yield of hybrid rice seed was also increased with the increase of the dosage. Under the conditions of this experiment, the best yield was obtained by using 20 kg of divot 1.5 kgghm-2, breaking 70% and then 3.0 kgm-2. The impact of divine power on the yield is mainly through the promotion of sterile lines to lift the package neck, raising stigma exsertion rate, flower ratio and seed setting rate before lunch play a role