| Excessive application of chemical fertilizers has caused serious pollution of agricultural production factors such as soil deterioration and non-point source pollution,which leads to fruits’ quality declining.At the same time,with the improvement of the economy and living standards,people’s consumption demand and quality requirement for fruits have become increasingly strong.Improper fertilization decisions and the mismatch between supply and demand have caused the decline of farmers’ economic income and the destruction of the agricultural ecological environment.Making scientific fertilization decisions aims to improve organic manure utilization,the arable land quality and farmers’ income,which is conductive to promote sustainable agricultural development,and promote the implementation of rural revitalization strategies.Considering farmers’ behavior of substituting chemical fertilizer with organic manure and the application of planting-breeding combined pattern,this thesis concentrates on farmers’ scientific production decisions in fruit supply chain.The aim of this study is to improve the economic profit and environmental benefits of the supply chain.The breakthrough of this study is to reveal the impact of the substitution of organic manures on the production and transaction of fruit supply chain.The thesis adopts a problem-solution approach with three steps including problem recognition,problem definition and problem solution.The research methodologies include variational inequality,supply chain network equilibrium and projection contraction algorithm.This thesis investigates fruit supply chain network equilibrium.In details,the studying works are as follows:(1)Considering the impact of fertilization decisions on fruits’ production and marketing,this thesis investigates the optimal decisions of farmers,retailers and demand market in equilibrium state to solve the mismatch between supply and demand of fresh fruit and chemical fertilizer pollution.Firstly,a fresh fruit supply chain network equilibrium model considering substituting chemical fertilizer with organic manure is constructed based on variational inequality theory,which takes economic and environmental benefits as the goal.Next,the supply chain network equilibrium model is solved by the self-adaptive projectionbased prediction correction algorithm.Then,a numerical case analysis of fresh grape supply chain is carried out.Finally,the sensitivity analysis of subsidy policy on organic manure,farmers’ social responsibility and quality preference is performed.This thesis achievement provides management suggestions for the promotion of organic manure utilization.(2)In view of the impact of planting-breeding combined pattern on fruit production and marketing in supply chain,this thesis considers reusing the manure waste generated by livestock during the breeding process,converting it into organic manure and providing it to the planting end.Two types of agri-products supply chain with mutual influence agriproducts are merged into a supply chain network.Firstly,a supply chain network equilibrium model considering the utilization of organic waste is built based on variational inequality theory.Next,the model is calculated by the self-adaptive projection-based prediction correction algorithm.Then,the case analysis with the combined table grapes and broiler breeding mode is carried out.Finally,the sensitivity analysis of potential market demand of broilers and fruit quality preference is executed.This thesis achievement verifies the economic and environmental protection of planting-breeding combined pattern and provides a theoretical basis for the implementation and promotion of this pattern.This thesis provides a new method about the decision management problem of fruit supply chain network equilibrium considering farmers’ fertilization decisions.The obtained fresh fruit supply chain network equilibrium model and related research results are conducive for farmers to reduce production costs,increasing economic income,and enhance the scientific nature of production decision-making.Numerical results provide a scientific decision-making basis for the promotion of substituting chemical fertilizer with organic manure,planting-breeding combined pattern and policy-making,which has great theoretical value and high practical significance. |
