摘要：为探讨水肥一体滴灌对玉米产量与氮素利用的影响,以玉米杂交种‘桂单688’为材料,列区设计,设4个灌水量(A1,A2,A3,A4)和4个施肥水平(B1,B2,B3,B4)进行田间试验。结果表明,灌水量由A4(1237.5 m3·hm-2)提高到A1(2 250 m3·hm-2)时,玉米产量由7 682.2 kg·hm-2提高到8 640.7 kg·hm-2,A1灌水量(2 250m3·hm-2)与B2施肥水平(纯N 191.25 kg·hm-2、P2O576.5 kg·hm-2和K2O 153.0 kg·hm-2)组合可获玉米产量9016.9 kg·hm-2,是最优水、肥配合选择。随着灌水量由A4提高到A1,玉米籽粒蛋白质由9.01%提高到9.92%;同一灌水量下,玉米籽粒蛋白质含量B1>B2>B3>B4;随灌水量增加,氮素利用率、氮素农学效率、氮素生理效率均有所增加,随施氮量增加氮素利用率、氮素农学效率、氮素生理效率均有所降低,同一施肥水平随密度增加氮吸收利用率、氮农学效率、氮生理效率均有所提高。合理的水肥协同优化组合可以提高水分、养分利用效率,是提高产量的关键。

摘要：为探讨不同施肥水平与种植密度对玉米产量及氮素利用的作用效应，以玉米杂交种‘桂单0810’为材料，裂区设计，设置4个施肥水平和6个种植密度，进行一年两季田间试验。结果表明：不同施肥水平与不同种植密度对玉米产量都有显著的作用效应；随着施肥水平提高，氮素利用率、氮素农学效率、氮素生理效率均有所降低，同一施肥水平随密度增加，氮素利用率、氮素农学效率、氮素生理效率均有所提高，通过调节种植密度可以较好发挥氮素的作用效率；v~t（A2）施纯N225．0kg／hm2、P2O5 75．0kg／hm2、k2O 187．5kg／hm2与种植密度在（B3）52500株／11】砰至（B4）60000株／hm2玉米产量可达7913．2—8207．8kg／hm2是一种较优的密、肥配合选择。

摘要：Elite maize hybrid Guidan0810 was selected as material, and the effects of fertilizing level and planting densities on yield and nitrogen utilization were dis- cussed in the study. In field experiments as per double-cropping system, 4 main plots （fertilization levels） and 6 subplots （planting densities） were set in a split plot design. The results suggested that yield had close relationship with fertilization levels and planting densities. Different fertilization levels and planting densities significantly affected yield. With the increase of nitrogen fertilization, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency declined. Under the same fertilization level, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency grew a little with the increase of planting density, so nitrogen efficiency could be improved by regulating planting density. The results also showed that A2 （including N 225.0 kg/hm2, P205 75.0 kg/hm^2, K20 187.5 kg/hm^2） matching to B3 （52 500 plants/hm^2） or B4（60 000 plants/hm^2） was a better design, which could obtain a higher yield in the range of 7 913.2-8 207.8 kg/hm2, respectively.