Abstract:

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/hm2. 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.