Abstract: Preventing and controlling agricultural pollution from non-point sources is a critical element to speed up thegreen development of agriculture. Currently, the mode of China's agriculture, which mainly depends on resource input, has not fundamentally changed. How to bring small agricultural households in line with the green development is a keyissue. Based on a survey data of wheat growers in Jiangsu Province, the paper evaluated the fertilizer-reduction effect ofdifferent scale agricultural operations. Results show that there is U-shape relationship between land-scale operation andfertilizer application intensity, meaning that only moderate land scale operation can drive farmers to reduce chemicalfertilizer application. If the land area is further expanded, the scale benefit will decline, and the cost of employment willincrease. Therefore, rational farmers will apply more chemical fertilizer to avoid these risks. The fertilizer intensity offarmers who buy green socialized services is lower than that of farmers who do not buy. The reason is that socializedservices can reduce technical costs and alleviate farmers' concerns about quality assessment and crop yield reduction. Inaddition, this paper also found that the reduction effect of land concentration is the most obvious and has a significantsynergistic effect with socialized services. Based on the above results, this paper suggests that the governmentshould avoid equating the concentration of land transfer with scale agricultural operations, focus on moderate landscale operation and high-standard farmland constructing, and provide convenience for the deepening of specialized agricultural services. At the same time, the government should also increase direct subsidies for the agents who providegreen specialized services, improve the evaluation and accountability mechanism for specialized organizations, andreduce farmers' negative concerns about technology adopting.