Mathematic optimization model of NPK fertilization for potato, Quanyun No.3

Using the quadratic regression current rotation compose design of 3 factors and 5 levels,the quantities of nitrogen(X1),phosphorus(X2)and potassium fertilizer(X3)for producing high yield on Quan-yun No.3 potatoes with commercial value were obtained.The results showed that the fertilizations affected the fresh potato production in the order,NK P,in loess hilly and gully regions in the southern Fujian with low soil fertility levels.The impact on the rate of commodity potatoes were KNP.Based on the best agronomy measure for potato production of 25.5 thm-2 and the percentage of commodity-grade potatoes at ≥75.39 % at 95% confidence level,the optimal combination by computer simulation for N was found to be 317.10-328.35 thm-2,P 110.85 thm-2 and K 293.70-331.05 thm-2.