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采用中长期田间试验对８种模拟施肥模型在温带的海伦试验站、暖温带的沈阳试验站和亚热带的桃源试验站进行了６～１０年试验，以比较、评价施肥在粮食生产中的贡献．结果发现，施肥在作物产量形成中的贡献随施肥制度和气候的热量因素所影响；在最佳施肥条件下，施肥在产量中的贡献率分别为海伦（温带）３０％、沈阳（暖温带）３８％、桃源（亚热带）４４％．按这一实验结果可以一般地估计：当其他技术条件不变时，施肥在产量形成中的贡献率最高可达３０～４５％，随所在地区气候的热量条件而不同．
In the mid-long term field experiment, eight kinds of simulated fertilization models were tested in the Helen test station in temperate zone, the Shenyang test station in the warm temperate zone and the Taoyuan test station in the subtropical zone for six to ten years to compare and evaluate the contribution of fertilization in grain production. The results showed that the contribution of fertilization to the crop yield formation was affected by the fertilization system and the climatic thermal factors. Under the optimal fertilization conditions, the contribution rates of fertilization in the yield were respectively 30% in Helen (temperate zone), Shenyang (warm temperate zone) 38%, Taoyuan (subtropical) 44%. According to the results of this experiment, it can be generally estimated that when the other technical conditions remain unchanged, the contribution rate of fertilization in yield formation can reach as high as 30-45%, which varies with the climatic conditions in the region.