图6. 土壤和气候因素对有机肥“增效”作用的贡献率
长柱后的数字代表土壤和气候因素对有机肥“增效”作用的贡献率。AK：土壤速效钾含量,SOM：土壤有机质含量,pH：土壤酸碱度,AAR：年均降雨量,TN：土壤全氮含量,FFP：无霜期,N Rate：施氮量,AP：土壤速效磷含量,MAT：年均温,ASD：年日照时长,AN：土壤有效氮含量,Crop：作物类型

Fig. 6. Contribution rate of soil and climatic factors to the "enhanced effect" of organic fertilizer
The number after the long column represents the contribution rate of soil and climatic factors to the “positive effect” of organic fertilizer. AK: Soil available potassium content, SOM: Soil organic matter content, pH: Soil pH, AAR: Average annual rainfall, TN: Soil total nitrogen content, FFP: Frost-free period, N Rate: Nitrogen application rate, AP: Soil available phosphorus content, MAT: Annual average temperature, ASD: Annual sunshine duration, AN: Soil available nitrogen content, Crop: Crop type