关键词: 石油污染物, 石油污染物, 油菜, 产量, 品质, 生理指标, 临界浓度

Abstract:

Abstract: China's current food safety studies were mostly from “big and single” macro-perspectives such as the policy, markets, technologies and resources and so on. These studies neglected micro-subjects of agricultural production—the important status and role of farmers. This paper studies food safety from "small and complete" micro-perspective and compares the different effects on food safety of the part-time farmers and the modern farmers. So this one thinks that too many part-time farmers will lead to the loss of labor force, cultivated land abandoned, a single food planting structure, less agricultural material input and exacerbate tensions between the small-scale production of agriculture and the large market and to China's reform and opening-up level of part-time farmers changes and changes in food production as an example of the empirical data analysis, which concluded that swing-mentality of the part-time farmers is not conducive to national food security and the modern farmers with a moderate scale、standardized production、a strong ability to absorb the modern elements and a high degree of capital and technology intensity and organization ensure the quantity and quality safety from the source. Therefore, in the current conditions for agricultural production and inefficient farming, to ensure national food security, it is necessary to guide china's current part-time farmers rationally and to break the bottlenecks of resources and institutions constraining the development of the modern farmers.