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用东莞桥头和广州石牌的大田试验数据，配制每造玉米Ｈ、Ｐ、Ｋ肥需求量的Ｓｔａｎｆｏｒｄ经验公式，由目标产量与特定地块的肥力算出玉米配方肥的Ｎ、Ｐ、Ｋ组分量。
Using Stanford empirical formula of Dongqiao Bridge and Guangzhou Shipai field to formulate the Stanford empirical formula of H, P and K fertilizer demand per corn, the N, P and K components of corn formula fertilizer were calculated from the target yield and the fertility of specific plots .