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Green agriculture is an important issue in agricultural development. The farming cooperative frequently chooses to improve its green innovation level of agricultural products to support the growth of green agriculture. Based on the characteristics of contract farming, this paper establishes a decision-making objective function for agricultural cooperatives considering the level of green innovation and uses the Stackelberg game method to analyze the decision-making behavior of contract farming supply chain participants. The research found that the green innovation level of the cooperative increased with the increase in yield per mu, and that the optimal contract price and planting area increased with the expansion of the market size. In particular, the planting area and green innovation level under the decentralized decision-making situation were lower than those under the centralized decision-making situation. Therefore, to better achieve supply chain coordination and improve the green innovation level, this paper proposes a "Cost sharing + Alliance expense" contract coordination mechanism. Numerical analysis shows that the contract coordination mechanism can effectively improve the green innovation level and realize the Pareto improvement in the profits of the cooperative and the enterprise. [ABSTRACT FROM AUTHOR]

It is vital to concentrate on conserving the ecological environment and promoting production efficiency in the process of planting natural rubber. Agricultural social services (ASSs) play an essential role in helping rubber farmers to achieve green production. Based on the survey data of 552 natural rubber farmers in Hainan Province, this study builds an index system regarding socialized services for rubber production from three factors: technology extension services, financial insurance services, and market information services. This research uses the slack-based measure (SBM) model and the Tobit model to analyze the green production efficiency (GPE) and the influences of rubber production socialized services on the rubber growers' green production efficiency. Our results revealed that (1) the average green productivity of rubber planting in Hainan is approximately 0.41, which means that there is ample space for improvement; (2) ASSs have a significant positive effect on increasing the green rubber production efficiency; and (3) among ASSs, the technical extension service has the most significant effect on improving the green production efficiency of the growers. To further raise GPE of natural rubber, the socialized service system can be strengthened in terms of technology, capital, and information. ASSs have noticeable potential in improving the efficiency of rubber green production while ensuring economic, social, and ecological sustainability. [ABSTRACT FROM AUTHOR]