播期对夏玉米生长发育和产量形成的影响

Effect of Sowing Date on Growth and Yield of Summer Maize

以郑单958和登海605为材料,比较研究了3个播期（6月4日、6月12日和6月20日）对其生长发育和产量形成的影响。结果表明,随着播期的推迟,两个夏玉米品种的全生育期、茎粗、穗长和穗粒数减少,株高、穗位和秃尖长度逐渐增加,单株干重、穗粗和行粒数在中间播期达最高值;穗行数和有效穗数在各处理间无显著差异,千粒重和产量的表现趋势因品种而异。在以济宁市为代表的鲁西南地区,郑单958的最佳播期为6月12日,登海605的适宜播期是6月12~20日,两者的适宜收获期为9月底10月初。

Three sowing dates（ June 4,12 and 20） were designed to study their effects on growth and yield of summer maize with Zhengdan 958 and Denghai 605 as materials. The results showed that the growth period,stem diameter,ear length and kernels per ear of the two varieties deceased with the postponing of sowing dat,while the plant height,ear height and bald length increased. The dry weight per plant,ear diameter and kernels per row obtained the highest values on the middle sowing date. The row number per ear and effective ear number had no significant differences between different treatments,and the 1 000- kernel weight and yield were different between different varieties. In the southwest area of Shandong Province with Jining City as representative,the optimum sowing date for Zhengdan 958 was June 12,and the suitable sowing period for Denghai 605 was from June 12 to 20; the suitable harvest time for the two varieties was during the end of September and the beginning of October.