控失尿素减施及不同配比对夏玉米产量及氮肥效率的影响

张倩, 韩本高, 张博, 盛开, 李岚涛, 王宜伦

Reduced application and different combined applications of loss-control urea on summer maize yield and fertilizer efficiency improvement

ZHANG Qian, HAN Ben-Gao, ZHANG Bo, SHENG Kai, LI Lan-Tao, WANG Yi-Lun

表4 不同产量水平下各施肥处理对氮肥利用效率的影响

Table 4 Effects of different fertilizer treatments on N fertilizer utilization efficiency under different yield levels

指标 Item 处理 Treatment 高产田 High-yield field 中产田 Middle-yield field 低产田 Low-yield field 氮肥利用率 REN (%) CF 20.53±3.24 bB 20.81±1.67 cC 27.72±1.98 bB CL 30.95±0.99 abA 34.10±2.40 aA 39.69±1.24 aA CL10 30.11±4.34 b 28.79±1.71 b 38.13±1.85 a CL20 41.60±3.85 a 18.09±1.59 c 37.83±3.53 a CL7:3 26.09±0.99 AB 33.56±2.60 A 41.82±0.89 A CL5:5 25.20±2.50 AB 25.79±0.79 B 38.36±3.06 A CL3:7 23.72±1.49 B 22.17±0.89 BC 32.63±2.13 B 氮肥农学效率 AEN (kg kg-1) CF 5.46±3.10 aA 5.78±1.36 aAB 5.35±0.89 aA CL 8.64±2.39 a A 7.76±0.37 aA 7.77±0.69 aA CL10 6.50±1.80 a 7.79±0.31 a 7.45±1.70 a CL20 8.81±2.38 a 4.91±1.15 a 7.02±2.81 a CL7:3 6.39±2.43 A 5.01±2.05 AB 7.93±0.08 A CL5:5 5.58±1.39 A 3.51±1.01 B 7.76±3.23 A CL3:7 5.05±1.12 A 3.33±1.24 B 7.01±2.65 A 氮肥偏生产力 PEPN (kg kg-1) CF 42.36±1.75 cB 38.80±0.28 dB 34.26±1.18 dB CL 47.82±1.38 bA 44.58±1.10 cA 39.61±0.31 cA CL10 56.66±1.00 a 51.74±0.72 b 46.69±2.03 b CL20 60.26±0.52 a 57.26±0.38 a 51.20±1.12 a CL7:3 48.75±2.05 A 43.81±1.79 A 42.19±1.24 A CL5:5 47.94±0.39 A 42.31±1.25 AB 42.00±2.12 A CL3:7 47.40±2.05 AB 42.13±0.96 AB 41.27±1.58 A