1982年至1984年,笔者多次进行杂交水稻追施保花肥的试验。结果表明,杂交水稻施保花肥一般增产10%以上,特别是在长势较差的田里,增产效果更显著,可达20%以上。从考种结果来看,追施保花肥的比不施的株高增加1.2—3.4厘米,包颈率低9.7—19.2%,千粒重增加0.39—0.85克,空秕率下降3. From 1982 to 1984, the author conducted several experiments on topdressing fertilizers of hybrid rice. The results showed that the hybrid rice fertilization generally increased the yield of fertilizers by more than 10%, especially in the fields with poorer growth and the yield enhancement effect was more remarkable, reaching more than 20%. From the results of the test species, topdressing fertilizer than the non-applied plant height increased by 1.2-3.4 cm, the package neck low 9.7-19.2%, 1000 grain weight increased 0.39-0.85 grams, the empty rate decreased 3.