In the 80 's of the 20th century, the problem of farming pollution had been gradually serious due to the rapid growth of population and economy development. The vegetable soil had been polluted by waste air, water and soil from industry, as well as the farming materials such as chemicals, pesticides, farming membrane, preparation of biochemistry, etc, and the poor fertilization with rural garbage and the excrement. All those not only result in the decrease of land quality, but also cause the vegetable quant...