Chemical fertilizer acidifying Chinese soil

Chemical fertilizer acidifying Chinese soil

A Chinese peasant adds the nitrogen in her crops ' The picture is offered: Zhang Fu's lock) It is reported China has been all the time in order that 7% cultivated land supports the people of 1/5 of whole world and struggles with the earth. Nowadays, some side effects brought in fast development of China's economy are forming the new challenge too: The pollution of air and water quality, nibbling to farmland of urbanization, all these are threatening the Chinese cultivated land. Nowadays, one new research make not in accordance with natural law soil acidifying to add the list to, and this is exactly because of excessively using to chemical fertilizer in the past 30 years.

According to American Science's online news, pH value of the soil is essential for plant to grow. Most crops will be neutral - -PH value equals 7- - or grow in the a little acid soil healthy and strongly. And once pH value of the soil drops, disease and pest brought by it will hinder the growth of the plant. And the strong acid environment will also accelerate the poisonous metal to the leaching of water body around. So as soil pH value begins to drop - -Just like nowadays things happened in China, the scientist begins to worry.

Soil scientist Zhang Fu's lock of Beijing China Agricultural University has carried on research with colleague's trend acidifying to this kind of soil. They compare the result that soil was surveyed of once carried on the eighties of last century with measurement result in the past 10 years. Researchers also collected and monitored the data obtained to the agricultural area of China tightly over the last 25 years at the same time. Researchers say on American Science published on February 12, from early period of the eighties of last century to the present, pH value of all soil types nearly found in China has dropped 0.13 to 0.80 units. Zhang Fu's lock shows, pH value of this kind of scale drops " usually takes dozens of ten thousand years " .

This article points out, such large-scale soil is acidifying may threaten the sustainable development of agricultural production, and will influence biochemistry of the nutriment to circulate and toxic component in the soil. The article reveals, the rate of utilization of the nitrogen in China - -But the speech of especially to the cereal crops and for example vegetables industrial crops growing in the greenhouse system - -Seem quite high compared with North America and Europe.

In nature, acid soil account for the whole world, have 30% of soil that ice cover, they and bio-diversity and productivity competence low and relevant often. It may be made of acid rain that the soil is acidifying, but the nitrogen that excessively uses a certain type is another reason, and this is confirmed as and cause the acidifying root of the trouble of Chinese soil by researchers. Since the seventies of last century, in order to obtain high output, Chinese peasants begin to use the chemical fertilizer more and more. But this kind of method has also caused the pollution of water quality and air while raising the output of crops. Nowadays, the agricultural expert estimates, in some areas of China, the use of the chemical fertilizer may have been already cut down by 60%.

Will be produced some very harmful influence by the decline of this pH value level that research institute verifies. The acid soil may be those paradise of destroying the nematode of the crops. Critical value that and pH value of at least part of Chinese soil has already approached aluminium and manganese leaches to the surface water, this will be a potential poisonous source.

Soil scientist Zhang GanLin in Chinese Academy of Sciences, Nanjing says: "This is a very important job. " He should get higher concern in China while agreeing to the acidifying effect of the nitrogen. But he says, this data that research institute obtains have some problems, " it only lacks accurate fixed information to the collection of the sample " . Dutch ISRIC - reputable soil scientist AlfredHartemink of the world soil information center agrees on this. He says: "You do not know where these samples come from. " And emphasize it is a soil scientist knowing little about China, after seeing the chemical fertilizer use of a large number of here, can predict too soil is acidifying.

But locks and rejects these queries, and show it is " from each province and each soil system " that his research has been adopted in a good fortune Large-scale fixed information. His supporter agrees with such a fact unanimously at the same time: This thesis has indicated to reduce the importance that the chemical fertilizer uses in China. The acid soil can be neutralized through adding the lime, but this is a little too expensive to not rich Chinese peasant. Zhang Fu's lock says, a better solution is to " stops excessively using (the chemical fertilizer) " . (beautiful and fragrant flowers)
Chemical fertilizer acidifying Chinese soil