Professor says heavy metal pollution, 12 million tons of food per year, accounts for 2.4%

Sheder, director of the University of Natural Resources and environment, professor of soil science, said that increasing the total amount of arable land is now difficult to improve the quality of arable land is the urgent task of "Finance and New network" (Intern reporter Luru Mao Shouxin) with the industrialization of China, urbanization and the reduction of arable land, soil quality is　　Southwest University has conducted a survey of soil in Chongqing, and found that soil acidification in Chongqing is serious. Members of the CPPCC, the Communist Party of China, Chongqing Municipal Party committee Sheder, is also the University of Natural Resources and environmental school dean, soil science level two professor.　　He told Caixin News reporter, Chongqing farmland ph value of less than 5.5 of the soil has been close to 48%, compared to the 80 's 26%, and the southern region are facing the same situation. Sheder said the soil acidification was even more severe in the south, where the soil was inherently acidic, coupled with acid rain and improper fertilization.　　In some places, the long-term use of urban industrial sewage irrigation farmland, long-term large-scale use of chemical fertilizers, which led to a decline in soil quality. He told reporters that the agricultural sector often emphasized the regulation of soil nutrients by fertilizers, ignoring other problems.　　For example, phosphate fertilizer stressed the phosphorus, but the fertilizer in the lead, arsenic, cadmium and other heavy metal content is not too much demand, long-term application of phosphate fertilizer will lead to excessive heavy metal, affecting food security. "At present, China's annual heavy metal pollution of about 12 million tons of food, accounting for the total production of 2.4% of the whole of Chongqing, the entire grain production."　　He said it is becoming more and more difficult to increase the amount of arable land and improving the quality of arable land has become a top priority for China's food security. But Sheder that the balance of arable land is usually accounted for, "often to fill the mountains or remote areas of poor soil, and occupy a very good place."　　"To improve the quality of arable land, he thinks that first of all, we need to transform the medium and the middle-yielding farmland, the medium and the middle-yielding land accounted for two-thirds of the total farmland. But he argues that it is difficult to improve the soil, first and foremost because it is difficult to regulate production systems and production forms. "Although the state has a set of laws and regulations to prevent pollution, it is really difficult to implement and can not regulate the scattered land." "He suggested," to make the size of the business area, so that the scale of the farm, and land circulation, such large-scale production of agricultural products can be certified by the Ministry of Agriculture pollution-free, green, organic and other signs. "In addition, it is difficult to repair heavy metals in the soil," he said. For example, centipede grass can absorb a lot of arsenic in the soil, through the adsorption of centipede grass, 3-5 years will be able to clean up pollution. "But farmers are unwilling to grow their own grass unless they are subsidized." There is therefore a need for a unified plan and which expenditures are subsidized by the government. If the government has subsidies, farmers will not be able to grow crops and plant plants that can repair the soil. "Sheder proposed.