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杂交水稻制种不同于水稻栽培、其结实由柱头外露结实和非柱头外露结实两部分构成；空壳中90％以上是由于没有授粉受精造成的：90％以上的受精拉都能正常发育结实。柱头外露率和受精率与结实率呈显著正相关。后期施肥、父本大龄秧和机械授粉能有效地提高柱头外露率、花遇优度和结实率及制种产量。
Hybrid rice seed production is different from rice cultivation, the firm by the stigma exposed and non-stigma exposed solid two parts; 90% of the shell is due to no pollination caused by fertilization: more than 90% of the fertilized pull can normally develop strong. There was a significant positive correlation between stigma exsertion rate and fertilization rate and seed setting rate. Post-fertilization, male parent seedling and mechanical pollination can effectively increase the stigma exsertion rate, flower nodules and seed setting rate and seed production.