高密度种植下氮肥对玉米根系生长及氮代谢的影响

周文丽, 郝淼艺, 张仁和

Effects of Nitrogen Fertilizer on Maize Root Growth and Nitrogen Metabolism under High-Density Planting

Zhou Wenli, Hao Miaoyi, Zhang Renhe

表1 2021-2022年不同密度和氮肥处理对玉米产量及其构成因素的影响

Table 1 Effects of sowing density and nitrogen application on the grain yield of maize from 2021 to 2022

年份 Year 密度处理 Density treatment 氮肥处理 N treatment (kg/hm2) 穗数 Ear number (×104 plants/hm2) 穗粒数 Kernel number per ear 百粒重 100-grain weight (g) 出籽率 Kernel percentage (%) 籽粒产量 Grain yield (×104 kg/hm2) 2021 D1 N0 6.72c 470.08a 31.05c 0.79bc 0.78c N1 6.78c 476.95a 35.40bc 0.82ab 0.94abc N2 6.56c 539.09a 39.89ab 0.76c 1.07ab N3 6.17c 496.80a 36.09bc 0.82ab 0.90bc N4 6.22c 517.39a 32.86c 0.80ab 0.84b D2 N0 7.17ab 486.21a 38.27ab 0.82ab 1.09a N1 7.50a 552.21a 40.39a 0.82ab 1.25a N2 5.94c 502.00a 37.44abc 0.84a 1.03abc N3 6.39c 491.84a 37.07abc 0.81ab 0.95abc N4 7.22ab 476.35a 33.59bc 0.80ab 0.93bc F值F value 密度 * ns * * ** 施氮量 * ns * ns ** 密度×施氮量 ns ns ns * ns 2022 D1 N0 5.87bc 404.57de 33.76ab 0.70ab 0.79c N1 5.60c 484.40bc 35.39a 0.79ab 0.96bc N2 5.92bc 488.17bc 34.83ab 0.78ab 1.00bc N3 5.17c 460.60bcd 34.96ab 0.74ab 0.82c N4 5.87bc 441.20cde 35.38a 0.71ab 0.92bc D2 N0 7.57a 399.27e 33.90ab 0.77ab 1.01abc N1 6.99a 423.21de 35.37a 0.82a 1.04abc N2 7.47a 501.50a 33.64ab 0.75ab 1.25a N3 6.88ab 480.77bc 33.04ab 0.65b 1.09ab N4 7.31a 398.90e 30.80b 0.80ab 0.90bc F值F value 密度 ** ns ns * * 施氮量 ns ** ns ns * 密度×施氮量 ns * ns * ns