宁夏引黄灌区春小麦氮磷钾需求及化肥减施潜力

王西娜,于金铭,谭军利,张佳群,魏照清,王朝辉

Requirement of Nitrogen, Phosphorus and Potassium and Potential of Reducing Fertilizer Application of Spring Wheat in Yellow River Irrigation Area of Ningxia

WANG XiNa,YU JinMing,TAN JunLi,ZHANG JiaQun,WEI ZhaoQing,WANG ZhaoHui

表5 不同施氮量下春小麦籽粒氮磷钾吸收量、需求量及收获指数

Table 5 The uptake, demand, harvest index of N, P and K for spring wheat grain at different N rates

处理代码Treatment 施氮量 N rates (kg·hm-2) 籽粒吸氮量 N uptake by grain (kg·hm-2) 氮收获指数 N harvest index (%) 氮需求量 N demand (kg·Mg-1) 籽粒吸磷量 P uptake by grain (kg·hm-2) 磷收获指数 P harvest index (%) 磷需求量 P demand (kg·Mg-1) 籽粒吸钾量 K uptake by grain (kg·hm-2) 钾收获指数 K harvest index (%) 钾需求量 K demand (kg·Mg-1) N0 0 95.3±29.6b 56.8±4.0a 38.3±2.6b 17.9±4.3b 68.2±3.6ab 6.0±0.6a 16.0±4.0b 8.6±1.4a 42.6±7.6d N1 60 105.1±13.3ab 55.2±7.8a 42.0±7.5ab 18.1±2.6b 68.3±1.7ab 5.8±0.2ab 16.3±3.0b 8.1±0.5ab 44.0±5.6cd N2 120 126.1±33.7ab 55.2±7.8a 40.3±8.3ab 20.7±7.7ab 67.1±10.3b 5.4±0.7b 20.9±4.3a 7.8±1.1ab 47.2±6.2ab N3 180 168.2±86.7a 57.9±9.0a 45.8±8.4a 23.9±3.7a 71.2±1.8ab 5.3±0.2b 23.2±3.7a 8.1±1.3ab 45.4±7.9bc N4 240 137.6±18.0ab 57.2±10.4a 43.9±2.7ab 21.3±2.3ab 73.5±3.6a 5.3±0.6b 19.8±4.4ab 7.3±0.7b 49.7±7.2a