风沙半干旱区春玉米水肥耦合产量效应研究初报

采用312-D最优饱和设计,开展了春玉米水肥耦合作用田间试验研究。结果表明,在试验年施氮量对产量影响最大,灌溉量次之,施磷量最小。两因子耦合的产量效应类型不同,氮与磷耦合以及磷与水耦合为相互替代作用,而氮与水耦合为相互促进作用,且耦合作用效应大小顺序为氮与磷耦合>磷与水耦合>氮与水耦合。获得最高产量9374.0kg/hm2的施氮量为281.7kg/hm2、施磷量为127.1kg/hm2、灌溉量为75.2mm。获得最高利润6023.5元/hm2的施氮量为211.2kg/hm2、施磷量为110.5kg/hm2、灌溉量为24.1mm。

Initial Research on Yield Effect of Nitrogen, Phosphorus and Water Coupling on Spring Maize in Semi-arid of Blown Soil

With 312-D optimized saturation design,field experiment was conducted to study yield effect of water and fertilizer coupling on spring maize.Results showed that nitrogen quantity was the chief factor to affect spring maize yield,irrigation quantity was the second factor,phosphorus quantity was the third.The type of interaction between nitrogen and phosphorus,phosphorus and water was substitutive for increasing yield,but that was positive between nitrogen and water.The effect order of interactions was nitrogen and phosphorus coupling > phosphorus and water coupling > nitrogen and water coupling.Amounts for highest yield 9 374.0 kg/ha were nitrogen 281.7 kg/ha,phosphorus 127.1 kg/ha and water 75.2 mm.And amounts for highest profit 6 023.5 yuan/ha were nitrogen 211.2 kg/ha,phosphorus 110.5 kg/ha and water 24.1 mm