Excessive use of pesticides, fertilizers, first on soil caused damage that cannot be ignored. Research shows that currently contaminated about 150 million mu of cultivated land, almost two thirds of the total land area of one-tenth in China. Beijing vegetable Research Institute senior agronomist, agricultural and forestry Sciences Chen Chunxiu believes that high degree of soil compaction, salinization, excessive use of fertilizers and a certain degree of relationship. And poor soil quality, use of, the more fertilizer, vicious circle. "In fact, these chemical fertilizer utilization of only 40%, it didn't work out, become pollutants. "Gaoming Jiang said, such as a well-known carcinogen nitrite, nitrate from the earliest, nitrate is an important ingredient in fertilizer. Nitrite residue in the land, cause serious pollution to soil, groundwater. Phosphate fertilizer and potassium extracted from ore, such as fertiliser, inevitably contain cadmium, iron, copper and other heavy metals. These carcinogens, heavy metal residues in soil will end up back in the plant. United States Department of agriculture experts study showed that is strongest on cadmium absorption in rice cereal crop, just a few years time, will lead to renal damage occurred, bone lesions, such as cadmium poisoning symptoms.
Fertilizer residues of cadmium in rice not only from direct pollution brought about by, also comes from industrial discharges on heavy metal pollution in farmland caused indirectly. According to data of the Ministry of land and show that 12 million metric tons of grain each year suffer from heavy metal pollution in China. From paragraph of xiangjiang River in Hunan Changsha, Hengyang to coast due to the large number of industrial waste water being released into the River, resulting in vegetables of arsenic, cadmium,tmtd accelerator, nickel, lead and other heavy metals content seriously exceeded, these "crop" not only is food every day by local farmers, were also transported to more towns and cities. In brilliant new book, the ecological environment of China Chiang Kai-shek in the crisis, spent 4 page lists all over the country have been media reports of hundreds of "cancer". For example, "look in Xinjian County Nanchang city, Jiangxi province town Juan River Reclamation field: from a chemical plant inside leakage of sewage flow into rice fields, all black rice seedlings in the fields. In 2004, the 80 households almost 20 people suffering from cancer, laryngeal cancer, lung cancer. "More and more violations in the field of industrial pollution, a new" killer chemicals ".
"Traditional agricultural was as sunrise and sunset, the seasons, meets a complete cycle of plants. But modern agriculture are predatory, reduce plant growth time as far as possible, increase plant production, their nutrition, security, and all must have a certain impact. "The Chinese Center for disease control and prevention of nutrition and food safety, food science and Technology Director Huo Junsheng told reporters. Now, such as in food crops such as cereals, apart from carbohydrates, minerals, vitamins and other trace elements in decline than in the past. A survey conducted in foreign countries, tomatoes sweet and sour of values is 2.77 now than in the past losses of nearly 15%; content of vitamin c than they did 30 years ago have fallen 17 mg.
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