深松与施氮量对春玉米产量及氮素吸收利用率的影响

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。

Effect of Subsoiling Strategies and Nitrogen Application on the Nitrogen Utilization Efficiency and Grain Yield of Spring Maize

The effects of subsoiling strategies and rates of nitrogen application on the nitrogen uptake and use efficiency and grain yield using the maize cultivars Zhengdan958(ZD958) were studied. The experiment followed a split plot experiment design, taking the various subsoiling treatments(CK: no-subsoiling; T1: interval subsoiling; T2: each row subsoiling) in the main-plots and N supply treatments as split-plot (0, 112.5, 225, 337.5 kg/ha). The results indicated that a wide annual variability in grain yield for subsoiling strategies and nitrogen application. The yield of T1 and T2 increased by 9.62%, 8.81%, respectively, compared to no-subsoiling, and the yield of N2, N1, and N3, increased by 65.32%, 62.60% and 49.09%, respectively, compared to N0 application. The yield increased mainly due to greater the kernel numbers and grain weight. With increasing of nitrogen application, nitrogen partial factor productivity, nitrogen recovery efficiency and nitrogen agronomic efficiency(show a decline current) is shown to reduce a current. It was concluded that use of interval subsoiling and each row subsoiling mode consistently could increase maize nitrogen physiological efficiency and nitrogen partial factor compared to no-subsoiling.