The determination methods of fertilization amount include fertility zoning (grade) matching method, target yield matching method, field experiment matching method, computer recommended fertilization method, nutrition diagnosis method, etc. The target yield matching methods include nutrient balance method and soil fertility difference subtraction method; The field experiment methods include fertilizer effect function method, nutrient abundance and deficiency index method, nitrogen, phosphorus and potassium ratio method; Nutritional diagnosis methods include soil diagnosis and plant diagnosis.

Fertilizer effect equation refers to the functional relationship between crop yield and fertilization.

Relative yield refers to the percentage of the crop yield when the fertilizer is not applied to the crop yield when all fertilizers are applied.