[Effect of Organic Fertilizer Replacing Nitrogen Fertilizer on Major Grain Yield in China]

To comprehensively assess the changing pattern of organic fertilizer substitution with nitrogen fertilizer on the yield of major grains in China, with 102 literature as the research object, through Meta-analysis we quantitatively explored the impacts of soil physicochemical properties, climatic conditions, and different nitrogen fertilizer replacement rates and supplemental application amounts. The results showed that the replacement of nitrogen fertilizer by organic fertilizer could increase crop yields compared with those from the application of nitrogen fertilizer alone, and soil quick-acting potassium content, pH, and annual average temperature had the most significant effects on the yields of the three major grains. When the nitrogen fertilizer replacement rate and the amount of supplemental nitrogen fertilizer applied were 31.06% and 241.78 kg·hm^-2, 26.52% and 173.31 kg·hm^-2, and 39.23% and 149.17 kg·hm^-2, the optimum yield increase ratios of 3.31%, 3.32%, and 1.08% were achieved for maize, wheat, and rice, respectively. Thus, the results of this study can provide a reference basis for rational fertilizer application in future crop production and help promote green agriculture.