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4 不同施氮量下春小麦生物量、产量、产量构成因素、氮磷钾养分含量
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Table 4 Biomass, grain yield and its components of spring wheat and concentrations of N, P and K in grain at different N rates
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| 处理代码Treatment | 施氮量
N rate
(kg·hm-2) | 生物量
Biomass
(kg·hm-2) | 籽粒产量
Grain yield (kg·hm-2) | 收获指数
Harvest Index (%) | 公顷穗数
Ears per hectare
(×104·hm-2) | 穗粒数
Number of grains per ear | 千粒重
1000 grains weight
(g) | 籽粒含氮量
N concentration in grain (g·kg-1) | 籽粒含磷量
P concentration in grain (g·kg-1) | 籽粒含钾量 K concentration in grain (g·kg-1) | | N0 | 0 | 14803±3620b | 4375±1201b | 29.4±0.01b | 433±40a | 26.4±4.0b | 48.9±2.4a | 21.61±1.0a | 4.13±0.2a | 3.67±0.3a | | N1 | 60 | 15274±1661b | 4537±478b | 29.7±0.01b | 443±34a | 26.4±2.9b | 50.4±2.8a | 23.14±0.7a | 3.97±0.2a | 3.56±0.3a | | N2 | 120 | 18735±3986a | 5668±1055a | 30.4±0.02ab | 461±81a | 31.1±3.6a | 49.2±1.7a | 21.99±2.1a | 3.55±0.8a | 3.67±0.2a | | N3 | 180 | 20411±1879a | 6331±955a | 30.9±0.02a | 483±37a | 31.8±3.9a | 48.9±1.8a | 25.65±9.0a | 3.78±0.1a | 3.67±0.1a | | N4 | 240 | 17712±3650ab | 5474±957a | 31.0±0.01a | 469±87a | 30.0±2.9a | 50.9±3.3a | 25.35±3.1a | 3.93±0.3a | 3.61±0.2a |
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