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Why use the agent that the agent is
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By Han Lewu
Posted:May 27,2011 Views:7 Subscribe:
Do not use a lot of external resources for its success in maintaining soil fertility and health. This is a hundred years ago, China's agriculture in Western agronomists found the most amazing place. But today, China's agriculture is on the road to industrialization by the large chemical fertilizer large pesticides, herbicides, additives, plastic sheeting and other running all the way coerced.
Now we are bogged down in the food security dilemma can not extricate themselves. Experts have warned that, should reflect our current agricultural production?
'White terror'
The 'white pollution', people tend to more concerned about the disposable plastic lunch boxes and the city shopping bags used. But the reporter was informed that currently there are about 500,000 tons of plastic sheeting year remains in the soil, plastic film rate of 40%. Agriculture film production in the agricultural use does not take into account a large number of the degradation problems, the ecological environment of China paid a heavy price, to accelerate the land of 'death(http://www.f-paper.com/).'
'I have a few field trips in ten countries, had never seen a country like ours, in a big way to promote the application of plastic sheeting, the country with mountains and rivers of a 'white'.' Jiang Gaoming researcher at the Institute of Botany says.
Long-term commitment of degraded ecosystems and rehabilitation of degraded farmland Jiang GM, told reporters a few days ago I start to see him in some rural areas was almost clear of a white plastic film covered farmland, hillside scene, the use of 'white terror' to describe.
According to Jiang Gaoming introduced a large number of residues in the soil in the plastic sheeting, 15-20 cm soil layer in the formation of hard permeable, breathable layer of hard farming. Some of his life and concluded: probably seven generations, 140 years is also degradation can not afford.
In Jiang Gaoming view, plastic sheeting is the most rubbish inventions of modern agriculture(News News http://www.f-paper.com/). People use it to be part of the increase resulting from dependence. Hoeing in the departure from the traditional approach, without organic manure, straw and other support, the covering layer of plastic sheeting to achieve the insulation, water, weeding, pesticides and other purposes, appear to be no better thing, but actually paid a heavy price, is accelerating land 'death.' tantamount to 'get its eggs.'
'Red lines' and endangered
Reporters were told that since the last century since the late 70s, just a few decades, China's cultivated land there is a clear decline in fertility, the national average of less than 1% of soil organic matter. And at the same time, China's chemical fertilizer and the growth rate is surprised.
According to Jiang Gaoming, the international recognized safety limits application of chemical fertilizer is 225 kg / ha, but the average per unit area of application of chemical fertilizers reached 434.3 kg / ha, 1.93 times the safe limit.
Provided from the average application rate of fertilizer chart shows changes in the last century, the age of 50 hectares (15 acres) of land more than 8 kg of chemical fertilizer is now 868 pounds. To a hundred times the speed increase.
'But these fertilizer utilization rate is only around 40%. Did not run out, have become contaminated.' Jiang Gaoming said.
Jiang Gaoming that maintaining the current food production, to pesticides and fertilizers, the application rate by half is sufficient.
There are a number for Jiang Gaoming to heart: China's factory farm animals produce 2.7 billion tons of animal waste every year, about 3.5 times the industrial solid waste. But separation of breeding and cultivation and other reasons, they could have become very good fertilizers, animal wastes should not use the place. results 'on the one hand agricultural non-point source pollution, on the one hand mass production of fertilizers. Both are due benefits or reduce. Victims are cultivated with consumers.' Jiang Gaoming said.
In fact, even without a direct result of chemical fertilizer and pesticide pollution, irrigation and other industrial and mining waste water sewage pollution on the land have made it an indirect overwhelmed. According to the survey, the country's arable land contaminated about 1.5 million mu, accounting for almost the total area of cultivated land in China one-tenth. this insight calls, hold 18 million mu of arable land 'red line' not just hold their number, but also keep their health, cleanliness of the 'red line.'
Where are we going?
In Jiang Gaoming view, Investment in agriculture rely on a large number of chemical substances called the salient features of the so-called modern agriculture, harm many, unsustainable. It is not only a large number of mining exploration, oil, etc., so that increased pollution and greenhouse gas emissions, a large number of chemicals into arable land, causing land pollution, 'but the damage must not stop there, land pollution is also a serious threat to food, food security.'
Jiang Gaoming said, 'around a circle, the ultimate land of toxic substances in the body to return to camp.' Recent reports 'cadmium rice' is an example.
When the 'hoe Wo day when afternoon' type replaced the traditional farming methods, pesticides, chemical fertilizers, herbicides, additives, plastic sheeting and other modern agricultural 'conventional weapons', the Jiang Gaoming that 'industrialization of agriculture has been greatly shaken our The agriculture. '
When the cause of watermelon 'explosion' is the leavening agent known to the public, people puzzled 'why use it' because it is clear that this is contrary to the laws of plant growth.
However, contrary to the laws of nature similar phenomenon in agricultural production everywhere, just as Jiang Gaoming cited: in-season fruit and vegetable production, exacerbated by drug residues in agricultural products, animals, 'crash course' to chickens, ducks, geese and other poultry class life cycle shortened to 28-45 days, the pigs reduced to 2.5-4 months. 'These serious breaches of the law of planting and breeding biology model inundation, so that a variety of pesticides, hormones and food additives, filled with urban and rural areas.'
People are confused: the source of our food - the primary agricultural products, have been subjected to such a chemical production, industrialization of the 'baptism', dare again in food processing, transport or preservation without restraint or even added a variety of chemical agents non-toxic and hazardous substances consumed? we really want to go?
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