"N report" Success or failure nitrogen fertilizer
Unofficial report A continuation of decades directed the national fertilizer subsidy policy research report, whether it is late in the reflection, or the hasty conclusion?
If the case in 2008, nearly a quarter of total output in China as much N Loss to the farmland beyond, will not help food production, but also a source of pollution. This alarming data from a document called "the true cost of nitrogen fertilizer," the unofficial investigation report (hereinafter referred to as "N Report").
Similar "chemical agriculture" against many years ago has been perceived by industry experts, but not known to the public, while at the same time, as China's main agricultural products of nitrogen fertilizer production capacity has increased year by year, agriculture on nitrogen over-reliance is growing.
1 14, "three rural" expert investigation team led by Wen Tiejun published its findings, and attempt to persuade the relevant state departments to adjust the subsidies to the fertilizer industry, which will directly challenge the continuation of decades of state fertilizer industry to support the policy of tradition behind it while maintaining as high as hundreds of billions of chemical fertilizer industry.
Success nitrogen, nitrogen is also lost
Outbreaks in recent years, many water pollution incidents have been looming shadow of nitrogen "fertilizer report" attempts to show a causal association.
2007 and 2008, the outbreak of blue algae in Taihu Lake event twice, once considered the scourge of industrial pollution. "N Report" cited a number of agricultural experts, lab reports, that such pollution incident, the nitrogen is also a culprit. "Taihu Lake area, farmland accounts for lake surface water total nitrogen input 1 / 4." January 14, Chinese Academy of Sciences, Chinese Academy of Sciences, Nanjing Institute of Soil Nitrogen Migration researchers would also support the "N report." Algae bloom in Taihu Lake is the internal high nitrogen content of phosphorus, lake eutrophication.
The weight of soil nitrogen is also unbearable. CHENG Cun-Wang, "N report" major contributors, 2008 survey found in Shandong, Heilongjiang greenhouse farmers even went to buy the soil as crop rotation soil, "the local soil for a large number of excessive use of chemical fertilizers and heavy metal." His analysis said. "Agriculture is the point source pollution (that there is no fixed point sources of pollution emissions, such as there is no outfall sewage network) in the largest industry contribution." "N Report" headed by Wen Tiejun said. He is based from the beginning of 2008, China's first pollution survey. Wen Tiejun said that at present no right to publish the results, but certainly the seriousness of agricultural non-point source pollution has become an indisputable fact. The investigators believe that the nitrogen is undoubtedly the main culprit of agricultural nonpoint source pollution.
The early days, the Chinese fertilizer production is only 06,000 tons, after half a century, China is already the world's largest nitrogen fertilizer production and consumption countries of the world's nitrogen fertilizer production 1 / 3.
This stems from the effect of nitrogen fertilizer for grain production. Wen Tiejun also acknowledged, as nitrogen fertilizer production and increasing China's wheat, corn and rice output of major food crops, once output growth of nearly ten times.
However, the "N Report" noted that nitrogen fertilizer is now far exceeds the demand for food crops, fertilizer efficiency decreased rapidly. Soil and Fertilizer Institute of Chinese Academy of Agricultural Sciences report quoted a survey in 17 provinces throughout the country have an average nitrogen application rate exceeded the ceiling of the internationally recognized 225 kg / ha. The Agriculture Department of Henan Province, a survey showed that the province each year more than 300 tons of fertilizer application, only 1 / 3 absorbed by crops, while the other, or into the atmosphere, or Shen in the soil, residues of chemical fertilizers has become a major pollution undercurrent.
Nitrogen pollution like industrial pollution is so fast and intuitive, "it is invisible." Wen Tiejun said. "N Report" also attributed to several major harm: water pollution, greenhouse gas emissions, heavy metal pollution.
Deeper level is a huge negative impact on energy consumption.
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