河套灌区中低产田油用向日葵肥料效应分析

为了确定内蒙古河套灌区中低产田油用向日葵氮、磷、钾肥料效应，采用三因素二次通用旋转设计法，对该灌区油用向日葵进行氮、磷、钾施肥试验研究。结果表明，河套灌区施用氮、磷、钾均对油用向日葵产量有显著的增产效果，并能用三元二次多项式进行模拟表达。最高理论产量可达4331.55 kg/hm2；最佳产量为4252.35 kg/hm2，氮、磷、钾的经济效益最佳配比为6.91:3.31:1。根据产量施肥的边际利润率值，可求出不同施肥成本的利润，从而选用投资少、获利高的施肥方案。

The Effect of Fertilizer on Economic Benefits of Oil Sunflower in Hetao Irrigated Area

In order to determine the effect of application of N,P,K of sunflower in low middle yield field in Hetao irrigated area of Inner Mongolia.A 3-factor and 2-degree common rotary design was used to analyze and simulate the effect of application of N,P,K in Hetao irrigated area of Inner Mongolia.The results showed that application of N,P,K could greatly increase yield of oil sunflower in Hetao irrigated area,and it could be expressed by a 3-factor and 2-degree mathematical model.The highest yield was 4331.55 kg/hm^ 2.The optimum proportion of N,P,K economic benefit was 6.91：3.31：1.According to the marginal profit value of fertilizer production,the cost of different fertilization could be obtained,and thus we could choose useless investment and high profit fertilization program.