以京农科728为试验材料,采用随机区组设计,设5个播期处理,研究不同播期对京农科728产量及机收子粒相关性状的影响。结果表明:(1)不同播期处理条件下,单粒精量播种田间出苗率均达到95%以上;生育期随播期推迟而缩短,但均可正常成熟;株高、穗位高随播期推迟呈增高趋势;5月25日播期条件下穗长最长、穗粒数最多。(2)过早或过晚播种,病虫害发生较重且结实性降低。(3)产量以5月25日晚春播处理为最高。随播期推迟,收获时子粒含水量和机收子粒破碎率增加,进而机收难度增加。 Jingyong 728 was used as experimental material, and random slot design was adopted. Five sowing dates were used to study the effects of different sowing dates on the yield and grain-trapping characters of Jingnong 728. The results showed that: (1) The seedling emergence rate of single grain sowing reached more than 95% under different sowing date; the growth period shortened with the delay of sowing date, but both of them could mature normally; Period was postponed increased trend; May 25 sowing conditions under the longest ear length, spike grain number the most. (2) Sowing too early or too late, pests and diseases occur heavier and less robust. (3) The yield was highest in spring sowing on the evening of May 25. Postponing with the sowing date, grain moisture content at grain harvest and grain crushing rate increased, and the harvesting difficulty increased.