## 5 Conclusions and Policy Implications  
Firstly, from the perspective of spatial spillover, this paper reveals the impact mechanism of scientific and technological agricultural innovation on agricultural green development and comprehensively evaluates the development level of green agriculture in 30 provinces in China from 2006 to 2019. On this basis, the economic matrix was selected as the spatial weight matrix. This paper explores the spatial spillover effect of scientific and technological agricultural innovation on agricultural green development from two dimensions, namely, agricultural technology R&D and agricultural technology application. The robustness of the results was tested by replacing the core explanatory variables. Finally, it puts forward specific countermeasures and suggestions to improve the level of agricultural green development with scientific and technological agricultural innovation. The main conclusions are as follows. First, the level of agricultural development in various regions of China is still in an unbalanced state, with notable differences between them. Second, there is a significant positive global spatial autocorrelation between scientific and technological agricultural innovation and the development level of green agriculture in terms of spatial distribution, but this global spatial relationship has not yet reached a steady state, and there is some fluctuation between years. It is necessary to include spatial spillover in the analysis of the effect of scientific and technological agricultural innovation on green agriculture. Third, scientific and technological agricultural innovation will promote the development of green agriculture in neighboring provinces through the positive spillover effect, and both agricultural technology R&D and agricultural technology application stages will have large positive spillover to their neighboring provinces. Based on the above conclusions, the following policy implications are proposed. It is necessary to reduce barriers to the flow of agricultural innovation elements and products, improve the flow efficiency and vigorously promote the spatial spillover effect of scientific and technological agricultural innovation in agricultural green development so as to achieve the ultimate goal of sustainable development. On the one hand, we should seek to break down interregional institutional barriers and local protectionism, solve the contradictions and problems with the current systems and policies and stimulate the leading role of the market. For different types of agricultural innovation elements and high-tech agricultural products, policies should focus on adaptively guiding the harmonious and orderly flow, gradually increasing the scope and region of their spatial spillover and narrowing the gap of agricultural green development level between regions. On the other hand, the market mechanism of innovation factors and product flow should play a leading role in spatial spillover. For example, we should strive to build a cross-regional market, improve the market mechanism of factor price, accelerate the flow and diffusion of agricultural technology in space, improve the synergy and complementarity of high-tech product production among regions and comprehensively and efficiently improve the green development level of agriculture in various regions through the spatial spillover of scientific and technological agricultural innovation. Limited by the availability of data, the evaluation index system of the agricultural green development level presented in this paper also has certain limitations. With the improvement of national statistical data, we can try to select new evaluation indexes to