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9 不同施钾量下春小麦籽粒氮、磷、钾吸收量,需求量及收获指数
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Table 9 The uptake, demand, harvest index of N, P and K for spring wheat grain at different K2O rates
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| 处理代码Treatment | 施钾量
K2O 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) | | K0 | 0 | 139.8±5.9a | 50.2±4.4ab | 47.2±6.9ab | 22.8±2.3a | 72.1±2.9a | 5.4±0.4a | 22.4±1.1a | 6.8±0.5ab | 56.0±4.1a | | K1 | 30 | 132.8±20.5a | 49.0±9.4ab | 48.4±3.3ab | 21.4±1.8a | 72.2±1.9a | 5.3±0.2a | 20.5±2.0a | 6.6±0.4ab | 55.7±4.3a | | K2 | 60 | 131.6±31.4a | 43.8±11.5b | 55.3±13.3a | 20.7±5.3a | 69.5±3.4b | 5.5±0.1a | 20.1±5.5a | 6.4±0.1b | 57.6±3.6a | | K3 | 75 | 137.6±18.0a | 57.2±10.4a | 43.9±2.7b | 21.3±2.8a | 73.5±3.6a | 5.3±0.6a | 19.8±4.4a | 7.3±0.7a | 49.7±7.2b |
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