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试验选用6个不同类型玉米品种,在2种密度、2种施氮水平和2种灌水处理下进行大田试验,对不同收获期的百粒重和产量进行分析。结果表明,不同栽培措施下不同玉米品种百粒重和产量随收获时期的变化而不同,低密、高氮和正常灌水条件下,各品种间的变化差异较小;高密、低氮和干旱下,各品种间的变化差异较大。不同栽培措施下,收获期与百粒重和产量呈线性相关关系,可用y=ax+b来表示,从9月17日至10月8日,收获期每推迟1 d,百粒重增加0.605 5～0.845 3 g,产量增加174.71～232.33 kg/hm2。综合品种和栽培措施因素,陕西关中夏玉米从9月17日开始,收获期每推迟1 d,百粒重增加0.444 4 g,产量增加205.78 kg/hm2。
Six different types of maize cultivars were selected for experiment. Field experiments were conducted under two kinds of densities, two nitrogen application levels and two irrigation treatments. The 100-grain weight and yield at different harvest stages were analyzed. The results showed that the 100-grain weight and the yield of different maize cultivars under different cultivation methods varied with the harvesting time, and there was little difference in variation among varieties under low, high and normal irrigation conditions. Under the conditions of high density, low nitrogen and drought , The difference between varieties is quite different. Under different cultivation measures, the harvesting period was linearly related to the grain weight per 100 grains and yield, which could be expressed as y = ax + b. From September 17 to October 8, the grain weight increased 0.605 5 ~ 0.845 3 g, the yield increased by 174.71 ~ 232.33 kg / hm2. Comprehensive varieties and cultivation factors, Guanzhong summer maize from September 17 onwards, the harvest period delayed 1 d, 100 grain weight increased 0.444 4 g, the output increased 205.78 kg / hm2.