[目的]研究杂交晚粳稻甬优538在浙北嘉兴的最适播种期。[方法]以常规晚粳主栽品种秀水134为对照，采用分期播种处理，研究其对甬优538性状及产量的影响。[结果]播种期与其齐穂期、全生育期分别呈极显著正、负相关，每迟播1 d，分别延迟、缩短0．31、0．71 d；与其株高、总叶数呈弱负相关，每迟播1 d，株高下降0．34 cm、总叶数减0．02叶；与其有效穂数、穂总粒、结实率均呈弱负相关，与千粒重呈极显著正相关，每迟播1 d，分别减少0．043万／hm 2、0．92粒、0．11个百分点，千粒重增加0．03 g；与其产量呈二次曲线关系，产量最高点播种期为5月23日，过此期随播期延迟产量下降。[结论]甬优538高产稳产，播种期弹性大，单产≥13000 kg／hm 2的适宜播期范围为5月15日～6月6日。%Objective] The aim was to study the optimal sowing date for Japonica hybrid rice Yongyou 538 in Jiaxing, Zhejiang.[Method] With conventional late Japonica rice variety Xiushui 134 as control, sowing at different dates, effects on traits and yield of Yongyou 538 were studied. [Result] Sowing period showed extremely significant positive and negative correlation with full spike period and whole growth period, sowing late 1 d, shortening 0.31, 0.71 d; Sowing period was weakly negatively correlated with spike number , total grains per spike, seed -setting rate, in-dicated extremely significant positive correlation with 1 000 -grain weight, sowing late 1 d, reducing 0.43 thousand/hm 2 , 0.92 grains, 0.11 percentage, 1 000 -grain weight increasing 0.03 g; Sowing period indicated quadratic regression curve with yield, the highest yield could be ob-tained when sowing date was on May 23.[Conclusion] Yongyou 538 has high and stable yield, the suitable sowing period of yield ≥13 000 kg/hm 2 is May 15 -Jun.6.
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