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根据89个水稻三要素肥料试验结果的无肥区产量水平，将福建稻田土壤划分成5个肥力等级。取同一肥力等级内的不同试验点的相同处理产量平均值，建立水稻区域施肥模型。依据这些模型，采用边际产量法或产量频率分析法确定各肥力等级的水稻最优施肥量。32个验证试验表明，不同肥力等级的水稻最优施肥量比常规施肥平均增产稻谷405-600Kg／hm2，每公顷净增收352～399元。
According to the results of 89 three-factor experiment of rice fertilizer-free zone yield level, Fujian paddy soil is divided into five levels of fertility. Take the same fertility level of different test points the same treatment output average, the establishment of rice regional fertilization model. Based on these models, the marginal yield method or yield frequency analysis method was used to determine the optimal fertilization rate of rice at each fertility level. 32 validation tests showed that the optimal fertilization rates of paddy rice with different fertility levels increased rice yield by 405-600Kg / hm2 on average compared with conventional fertilization, with a net increase of 352 ~ 399 yuan per hectare.