宁夏引黄灌区春小麦氮磷钾需求及化肥减施潜力
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王西娜,于金铭,谭军利,张佳群,魏照清,王朝辉
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Requirement of Nitrogen, Phosphorus and Potassium and Potential of Reducing Fertilizer Application of Spring Wheat in Yellow River Irrigation Area of Ningxia
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WANG XiNa,YU JinMing,TAN JunLi,ZHANG JiaQun,WEI ZhaoQing,WANG ZhaoHui
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表7 不同施磷量下春小麦籽粒氮磷钾吸收量、需求量及收获指数
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Table 7 The uptake, demand, harvest index of N, P and K for spring wheat grain at different P2O5 rates
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| 处理代码Treatment | 施磷量
P2O5 rate (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) | | P0 | 0 | 110.1±4.1b | 42.6±8.1b | 48.2±10.3a | 18.0±2.3b | 62.9±2.9b | 5.3±1.3a | 22.2±6.2a | 6.1±2.2a | 68.1±22.4a | | P1 | 48 | 145.1±31.8a | 54.2±7.4a | 46.6±4.3a | 22.0±2.9a | 75.1±2.3a | 5.1±0.3a | 22.1±3.6a | 7.6±0.9a | 50.7±4.9b | | P2 | 96 | 142.2±32.0ab | 52.0±6.3a | 52.5±11.0a | 19.3±2.3ab | 68.8±4.1ab | 5.4±0.2a | 19.0±2.4a | 6.2±1.1a | 58.9±9.6ab | | P3 | 120 | 137.6±18.0ab | 57.2±10.4a | 43.9±2.7a | 21.3±2.3a | 73.5±3.6a | 5.3±0.6a | 19.8±4.4a | 7.3±0.7a | 49.7±7.2b |
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