从各地试验来看,杂交水稻追施保花肥一般可增产10％以上,特别是稻株长势较差的田块,增产效果更显著。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,苞颈率降低9.7—19.2％,千粒重增加0.39—0.85克,空秕率下降3.8—5.8％。杂交水稻追施保花肥的增产效果之所以显著,主要原因是:①杂交水稻营养生 From all over the trial, hybrid rice topdressing fertilizer can generally increase the yield of more than 10%, especially in rice fields growing poor plots, yield more pronounced. From the test results, topdressing fertilizer than the non-applied plant height increased by 1.2-3.4 cm, necks reduced by 9.7-19.2%, grain weight increased 0.39-0.85 g, empty rate decreased by 3.8-5.8%. Hybrid rice topdressing fertilizer yield increase effect is significant, the main reason is: ① hybrid rice nutrition students