RESEARCH ON EVALUATION METHOD OF RICE PLANTING NEGATIVE EXTERNALITY BASED ON KNAPSACK MODEL
In the current rice production process,negative externalities have been caused.In order to alleviate the above problems,it is important to systematically reflect on the negative externalities of rice production,evaluate its cost with the knapsack model.Based on the model,a set of algorithmic mathematical framework was designed,and the negative externality was evaluated by monotone algorithm,greedy algorithm and improved irregular greedy algorithm respectively,thus providing useful reference for the algorithm design.At the same time,combined with the relevant data of China Agricultural Statistical Yearbook in 2022 and field investigation,the research conclusion was double tested by empirical measurement and AHP.Generally speaking,monotone algorithm(0.597 9)was the best method to realize the evaluation and carrying of negative externalities in rice production,which had high processing efficiency.Monotone algorithm occupied a relative advantage among the three algorithms.The irregular greedy algorithm(0.326 8)had further improvements in processing methods,processing efficiency and satisfaction compared with the monotonous algorithm,but it was still easier to achieve the optimal scheme than the greedy algorithm.Greedy algorithm(0.075 2)occupied a relative disadvantage because it greedily entailed the carrying capacity of negative externalities into the environmental carrying capacity(knapsack)and ignored the problems of value ranking and collocation.In summary,the design of the study gives policy makers some policy enlightenment.Firstly,agricultural departments should improve their comprehension of the negative externality.Secondly,the statistical department should expand the relevant data of rice production to improve the availability and completeness of the data.Thirdly,the policy department should strengthen the preventive propaganda of negative external pollution sources in rice production.Finally,rice industry should take the new road of ecological agriculture with low negative externality.
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