播期对夏玉米生育期、形态指标及产量的影响

Effect of Sowing Date on Growth Stages,Morphological Index and Yield of Summer Maize

以＂郑单958＂夏玉米为试材,通过田间试验,研究不同播期条件下夏玉米的生育进程、形态指标、产量及其构成因素。结果表明,不同播期间夏玉米株高和叶面积指数（LAI）差异显著,晚期播种的玉米LAI峰值推后。随着播期延迟,收获期相对延迟、生育期缩短,穗长、穗粒数减少,百粒质量下降,产量降低25.4%~30.3%。＂郑单958＂夏玉米在豫东地区适宜播期为6月5日-6月24日。

Based on a field experiment of maize hybrid Zhengdan 958, the effect of different sowing date on growth stages, morphological index, yield and its components of summer maize were studied. The results showed that plant height and leaf area index （LAI） of summer maize were significantly differ ent in different sowing dates,the peak of LAI with late planting was postponed. With the delay of so wing date, the harvest was postponed, the growing period was shortened, spike length ,grains per spike and kernel weight decreased as well. Yield decreased 25.4% to 30.3% under the condition of later sowing. The suitable sowing period for summer maize Zhengdan 958 was from June 5th to June 24th in the eastern region of Henan province. The results provide reference for high-yield cultivation of summer maize.