神力素喷施剂量对杂交稻制种产量的影响

Effect of Spraying Dosage of Shenlisu on Rice Hybrid Seed Production

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。

The experimental results indicated that at the range of spraying dosages less than 4.5 kg·hm -2 the yield increasing was along with the dosage increasing; in the same dosage the effect was better by 2 sprayings than 1.Under the experimental conditions, the highest yield was achieved with 1.5 kg·hm -2 dose spraying at the 20% heading stage and 3.0 kg·hm -2 at the 70% heading stage. The effect of Shenlisu on the hybrid seed production was mainly by solving the problem of panicle base packages and increasing the rate of stigma exsertion, the proportion of forenoon flowering and the percentage of seed setting.