【摘要】 以郑单958、浚单20和洛玉4号为材料,对不同收获期夏玉米子粒长、乳线长、含水量、容重、千粒重及其产量效应进行研究。结果表明,玉米适时晚收具有明显的增产效果。在豫西生态条件下,与玉米吐丝后45 d比较,推迟15 d收获平均增产1 333.6 kg/hm2,千粒重平均提高42.55 g。对吐丝后天数与子粒产量及子粒特性的关系建立数学模型,表明该地区玉米粒重和产量最高值出现在吐丝后第62天,至完熟期3个品种子粒乳线均未完全消失,子粒含水量下降到27%以下可作为收获期的标准,容重最高值出现在吐丝后第49天,晚收影响子粒容重。更多还原

【Abstract】 In order to study on the most suitable harvest time of summer maize variety in the west of Henan,this experiment took Zhengdan958,Xundan20 and Luoyu No.4 as the materials,and studied on grain length,the length of milk line,bulk density,1 000-grain weight and yield effect through choosing different harvest times.The result showed that timely harvest later had obvious effect on increasing production.Under the ecological conditions,com-pared with the 45th day after silking,when postponed for 10 days(the 55th day after silking),the production increased 1 116.4 kg/ha,and the 1 000-grain weight increased 37.89 g,when postponed for 15 days(the 60th days after silk-ing),the production increased 1 333.63 kg/ha,and 1 000-grain weight increased 42.55 g.The mathematical model analysis of relationships day after silking,grain weight and grain characteristics showed that,the maximum of grain weight and yield appeared in the 62th days after silking,and the grain milk lines of the three varieties were not com-pletely disappeared until ripen period,and when the grain water content drops to 27% can be harvested.The results showed that the greatest bulk density values appeared in the 49th day after silking,and harvest later had influence on the grain bulk density.更多还原