播期对夏玉米生长发育、籽粒灌浆特性和产量的影响

Effects of Sowing Date on Growth,Kernel Filling and Yield of Summer Maize

选用郑单958为试材,从6月1日开始每隔4天设置1个播期处理,共设置6个播期,研究其对玉米生长发育、籽粒灌浆特性和产量的影响。结果表明:随播期推迟,玉米生育期缩短,穗位高增加,株高无显著变化;穗粒数、千粒重及出籽率降低,6月1日和6月5日播种处理收获时籽粒乳线均消失,千粒重和产量最高。收获时所有播期处理籽粒含水量均在30%以上,不适于进行籽粒直收。

With Zhengdan 958 as experimental material,six sowing dates were designed to study their effects on growth,kernel filling and yield of summer maize.The sowing date was set every five days from June1.The results showed that with the delay of sowing date,the growth period of summer maize was shortened and the ear height increased; the grains per spike,1 000-grain weight and shelling percentage decreased;however,no significant difference in plant height was observed between different sowing dates.In the harvest time,the milk line of grains disappeared,and the 1 000-grain weight and yield reached the highest under the treatment of June 1 and June 5.The moisture content of kernels were more than 30% in all the treatments at harvest time,so it was not suitable for direct grain harvest.