A scholar recently published in the forum "Agriculture is the largest source of pollution in China" and "the amount of chemical fertilizer is reduced by 40%, China's grain output has no impact" remarks, which triggered a heated debate even behind and questioned the two factions. 

Even behind the camp, a scholar, made the remarks basis and emboldened from the domestic agricultural fertilizer utilization is low, the serious pollution of the environment reality. Needless to say, the utilization of chemical fertilizer in China is indeed lower ammonium bicarbonate utilization rate of less than 20%, urea utilization rate of less than 60%, the utilization rate of less than 20% of the phosphate fertilizer, potash fertilizer utilization rate is only about 45%. Such low utilization surface more than half of the fertilizer white, means that the reduction of four percent fertilizer is reasonable; according to the law of conservation of mass, since there is no loss of fertilizer used on the "right path", then it will formed by "evil ways" of soil or water pollution. So, from this point of view, seems to be well made the remarks. 

Questioned faction that argument untenable agricultural pollution blamed excessive fertilization. Because the debatable buckle in the head of the agriculture only based on sample data, it will be China's largest source of pollution "hat. Example, the pollution of Taihu Lake, Dianchi Lake, agricultural pollution in the end What percentage of the different researchers, different time to do the data are not the same. 

I thought, "Agriculture is the largest source of pollution" and "the amount of chemical fertilizer is reduced by 40%, China's grain output no remarks from the actual situation in the idealistic and judgmental component, is a sensational speculation techniques easy to mislead public opinion, to bring the confusion of the guiding ideology of fertilizers and even agriculture. 

Conditions of Use As a large agricultural country, the reform and opening up 30 years, China's grain output has been achieved doubled; China's total grain output of 589.57 million tons in 2012, for nine consecutive years of bumper harvests; China accounts for one seventh of the world's arable land to feed the world one fifth of the population. These remarkable achievements, closely linked with fertilizer, which only nitrogen, phosphorus contribution rate of over 50%. Therefore can safely say that there is no adequate fertilizer on food security, not to mention the food security. 

According to the law of diminishing arable land fertility and land productivity will show a natural downward trend, and in order to restore soil fertility and maintaining crop yield harvest, it is necessary to rely on a variety of fertilizers, which fertilizer is the protagonist. This rural farming close planting the degree is very high, for example, planting wheat generally is the traditional the sower amount of 2 to 3 times more after emergence Catcher in the dense, almost did not leave the pin open space. This close planting the extent, if there is not enough fertilizer efficiency support crop growth and harvest is unthinkable. Obviously, contemporary agriculture, and fertilizer, even for a moment can not be separated. Some experts pointed out that the current contribution rate of fertilizer for grain production is still at 40% to 50%, fertilizer and fertilization technology is not a major breakthrough in the situation, to reduce fertilizer means cut. Therefore, to reduce the amount of chemical fertilizer for the reality of the current structure of fertilizer varieties is undoubtedly take food security kidding. 

Therefore, I think the scientific attitude towards fertilizer and the correct approach should be: it is necessary to fully understand the role of chemical fertilizers on agricultural farming decisions, but also to see fertilization there is a serious lack of; should actively improved the existing fertilizers and R & D of new fat species, but also accelerate the promotion slow control fertilization, soil testing, fertilizer, quantitative fertilization method, trying to reduce the loss of fertilizer to avoid fertilizer pollution.