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最优饱和设计试验建立的春小麦产量回归数学模型表明 ,水分是影响辽西半干旱区春小麦产量最为重要的因子 ,但在自然降水条件下 ,灌水量上、下限分别为 45mm和 3 60mm时 ,N对春小麦产量影响更为敏感 ,其次为水与P因子 ,三因子对小麦产量影响统计分析达显著水平 ,并且其对小麦产量的影响符合报酬递减率 .获得最大利润时N、P和水三因素最佳经济配比模式为施N量 186kg·hm-2 ,施P量 63kg·hm-2 ,灌水量3 0 0mm ,在缺水条件下适量增施P肥有利于增强春小麦的抗旱作用
The mathematic model of spring wheat yield regression established by the optimal saturation design experiment shows that water is the most important factor affecting the spring wheat yield in the semi-arid region of western Liaoning. Under the condition of natural rainfall, when the upper and lower irrigation levels are 45mm and 360mm respectively, The impact of spring wheat yield was more sensitive, followed by water and P factor, three factors statistically significant impact on wheat yield statistics, and its impact on wheat yield in line with the rate of return decline.When the maximum profit of N, P and water, the three factors The optimal economic model was N application rate of 186kg · hm-2, P application rate of 63kg · hm-2 and irrigation capacity of 300 mm. The application of P fertilizer under water deficit would be beneficial to enhance the drought resistance of spring wheat