| 【Objective】In view of the serious agricultural pollution and the excessive application of chemical fertilizer
in economic crops in China, taking apple production as an example, the optimal amount of fertilizer application for both
economic and ecological benefits of apple was estimated.【Methods】The external cost and marginal output of chemical
fertilizer were estimated by using dose effect method and secondary production function method.【Results】The results
showed that the optimal economic fertilization rate considering ecological benefits was 932.55 kg /hm2, but it was prone to be
affected by the change of market price. It would decrease with the increase of fertilizer price and increase with the increase
of apple price. The external cost of chemical fertilizer was 0.73 yuan/ kg, and the pollution costs were expensive and ranked
as: air pollution < soil pollution < water pollution.【Conclusion】The average fertilization intensity of apple in China meets
the requirements of the best fertilization amount, but there are obvious regional fertilization differences in different apple
production areas, and the problem of excessive fertilization is more serious in some apple production areas. Therefore, some
suggestions such as reducing the financial policy intervention of chemical fertilizer, accelerating the promotion of soil testing
formula fertilizer and establishing the ecological compensation system are put forward . |
