Over long time, human meals and clothing depended primarily on agriculture. While ever for the reason that historic time, agriculture had always relied on quite a lot of human labor, which was subject to numerous kinds of natural conditions. So the development of agriculture was very slow. In the course of the nineteenth century, using agricultural machinery gradually improved the working conditions. Nonetheless, in agricultural production, it was the application of chemical fertilizers and pesticides that really increased the agricultural output in per unit area.
Apply shows that, amongst all the measures to increase the agricultural production, the position performed by chemical fertilizers is forty% to sixty five%. On the basis of the booming within the petrochemical trade, artificial ammonia and urea have realized giant-scale production, which makes the output of chemical fertilizer occupy a large proportion within the chemical products. In 1985, the total output of chemical fertilizer on the planet amounted to approximately 140 million ton, which made it grow to be one of the bulk chemical products. In recent years, the development of nitrogen, phosphorus and potassium compound fertilizer and trace components fertilizer has further meet the demands of various soil constructions and totally different crops.
In the early interval, people used natural animals, plants and minerals to prevent and treat crop pests and diseases. Until the late 19th century, after the formation of contemporary chemical trade, individuals started to use arsenic preparation to kill beetles on potato, and use Bordeaux combination to prevent and deal with downy mildew on grapes, so that agriculture started a new era of chemical prevention and treatment. During the Forties, quite a lot of pesticides and herbicides, reminiscent of organic chlorine, organic phosphorus, have been produced and widely used in agriculture, forestry, animal husbandry and public health. However, among the pesticides during this period were rich in residues or poison, which caused ecological air pollution, so that they had been banned by many countries.
Lately, a number of environment friendly, low-residue, low-poisonousity pesticides have been developed, including pyrethroid, which is a bionic pesticide and will not pollute the environment. It has been put into industrial production. As a result, bio-pesticides have develop into the most active areas in pesticide research currently.
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