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以郑单958为供试材料,采用裂区试验,设置深松模式为主区(CK:不深松;T1:隔行深松;T2:行行深松),施氮量为副区(N0:不施氮肥;N1:纯氮112.5 kg/hm2;N2:纯氮225 kg/hm2;N3:纯氮337.5 kg/hm2),研究不同栽培模式下春玉米产量形成特点和氮素吸收利用特征。试验结果表明,深松与施氮量对春玉米产量的影响均达到显著水平,行行深松和隔行深松产量分别较不深松高9.62%和8.81%;N2、N1和N3处理产量分别较不施氮肥提高65.32%、62.60%和49.09%,穗粒数和千粒重的提高是深松和合理的施氮量显著提高春玉米产量的原因。随着氮肥用量的增加,作物氮肥偏生产力、氮肥吸收利用率和氮肥农学利用率呈降低趋势,隔行深松和行行深松的氮吸收利用率和氮肥偏生产力均高于不深松,且隔行深松的氮吸收利用率更高。
Taking Zhengdan 958 as the test material, the subsoiling area (N0) was set up by split-plot test, with subsoiling mode being the main area (CK: not subsoiling; T1: interlaced subsoiling; T2: subsidence) : No nitrogen fertilizer; N1: pure nitrogen 112.5 kg / hm2; N2: pure nitrogen 225 kg / hm2; N3: pure nitrogen 337.5 kg / hm2) to study the yield formation characteristics and nitrogen absorption and utilization characteristics of spring maize under different cultivation modes. The results showed that the effects of subsoiling and nitrogen fertilization on the yield of spring maize all reached a significant level. The yield of subsoiling and interlacing subsoiling were 9.62% and 8.81% Compared with no nitrogen application, the increase of 65.32%, 62.60% and 49.09%, and the increase of grains per spike and 1000-grain weight were the reasons for the subsoiling and rational application of nitrogen fertilizer to significantly increase the yield of spring maize. With the increase of nitrogen application rate, the partial productivity of nitrogen fertilizer, the rate of nitrogen absorption and utilization and the rate of utilization of nitrogen fertilizer showed a decreasing trend. The nitrogen absorption and utilization efficiency and nitrogen fertilizer partial productivity of intercropped and pine submerged pine were higher than that of non-subsoiling yield Interlacing subsoiling nitrogen absorption and utilization rate higher.