摘 要：为探讨不同播期对吉林省春玉米生长发育和产量形成的影响，本试验以吉林省主栽品种通单258、华科425、农华106为材料，进行5个播期处理试验，播期设置分别为：4月28日（T1）、5月4日（T2）、5月11日（T3）、5月18日（T4）、5月25日（T5）。结果表明：随着播期推迟，各品种玉米生育期均不同程度缩短，并且播期越晚，干物质积累量越低；玉米开花期前，不同处理叶面积指数差异不显著，花后晚播处理叶面积指数下降快于早播处理；推迟播期，不同品种秃尖长、空杆率增加，穗长、百粒重降低，产量下降，其中T1处理产量与T4、T5处理差异达显著水平。综上所述，适时早播，有利于玉米产量的进一步提高。
英文摘要:
Abstract: In order to explore the effects of spring maize growth and yield formation on different sowing datesin Jilin province, this experiments were carried out with three main cultivars of Tongdan 258, Huake425 , Nonghua 106 on five sowing dates, there were April 28(T1), May 4(T2), May 11(T3), May 18(T4) , May 25(T5) respectively. The results showed that different varieties of maize growth period was shortened on different level with the sowing date delayed, and the sowing date was later, the dry matter accumulation was lower. The difference of LAI was not significant under different treatments before the flowering, however, the LAI of late sowing date decreases faster than early sowing date. Bare top length, sterile plant rate were increased, but the ear length, 100-seed weight, yield were declined with delay sowing date of varieties maize, there were significant differences on yield between the treatment of T1 and T4, T5. About all, the early sowing on appropriate time was beneficial to improve the maize yield.
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