对亚种间杂交稻ＰＥ０３７×０２４２８籽粒结实性状和籽粒相对含水率的研究表明：亚种间杂交稻４月上、中旬和６月上、中旬播种有利其籽粒的充实，５月初播种则结实率最低：亚种间杂交稻的结实率受源、库影响明显；结实率低的主要原因，是由于其籽粒相对含水率的变化幅度小 The study on grain traits and grain relative water content of hybrid rice PE037 × 02428 showed that the sowing of the subspecific hybrid rice in April and mid-April and the middle of June was conducive to the enrichment of grain, while the seed setting in early May Lowest: the seed set rate of inter-subspecific hybrid rice is obviously affected by source and sink; the main reason of low seed setting rate is due to the small change of relative water content