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通过田间试验研究不同施氮水平对6个主推品种在砂姜黑土区的产量、产量构成因素、氮素利用及节氮增产潜力的影响。结果表明,施氮显著提高各玉米品种的子粒产量,对收获指数的影响相对较小;施氮显著增加行粒数、穗长和穗粗,增幅分别为22.5%~66.9%、16.8%~50.5%和9.4%~29.7%,N120与N240水平间无明显差异;各玉米品种的氮肥农学利用率和氮肥偏生产力均表现为N120显著高于N240水平,平均值分别是N240的1.89倍和1.96倍;蠡玉13和郑单958的节氮增产潜力明显高于其他品种。综合分析认为,适宜在胶东砂姜黑土区推广的玉米品种排序为蠡玉13、郑单958、浚单20、先玉335、莱农14、先锋32D22。
Field experiments were conducted to study the effects of different N rates on the yield, yield components, N use efficiency and yield-increasing potential of six main push varieties in Shajiang black soil area. The results showed that nitrogen application significantly increased the grain yield of maize varieties and had a relatively small effect on the harvest index. N application increased grain number, spike length and ear diameter by 22.5% -66.9% and 16.8% -50.5 % And 9.4% -29.7%, respectively. There was no significant difference between N120 and N240 levels. The N fertilizer use efficiency and N fertilizer partial productivity of all maize cultivars showed N120 significantly higher than N240, the average values were 1.89 times and 1.96 times that of N240 ; Nodua 13 and Zheng Dan 958 nitrogen yield potential was significantly higher than other varieties. According to the comprehensive analysis, the maize varieties suitable for spreading in the lime black area of Jiaodong were Yuyu 13, Zhengdan 958, Xundan 20, Xiangyu 335, Laionong 14 and Pioneer 32D22.