19 May Chemical Industry – The Backbone of Agricultural Development
Over long time, human meals and clothing depended primarily on agriculture. While ever for the reason that ancient time, agriculture had always relied on a variety of human labor, which was subject to various kinds of natural conditions. So the development of agriculture was very slow. Throughout the nineteenth century, the use of agricultural machinery gradually improved the working conditions. However, in agricultural production, it was the application of chemical fertilizers and pesticides that really elevated the agricultural output in per unit area.
Apply shows that, amongst all the measures to extend the agricultural production, the position played by chemical fertilizers is 40% to 65%. On the basis of the booming in the petrochemical business, artificial ammonia and urea have realized massive-scale production, which makes the output of chemical fertilizer occupy a big proportion in the chemical products. In 1985, the total output of chemical fertilizer on the earth amounted to approximately 140 million ton, which made it become one of the bulk chemical products. In recent times, the development of nitrogen, phosphorus and potassium compound fertilizer and hint components fertilizer has further meet the demands of various soil structures and completely different crops.
Within the early period, folks used natural animals, plants and minerals to prevent and treat crop pests and diseases. Till 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 stop and treat downy mildew on grapes, so that agriculture started a new period of chemical prevention and treatment. Through the Forties, a number of pesticides and herbicides, resembling organic chlorine, natural phosphorus, have been produced and widely used in agriculture, forestry, animal husbandry and public health. However, among the pesticides during this interval had been rich in residues or poison, which caused ecological air pollution, in order that they had been banned by many countries.
In recent times, a number of efficient, low-residue, low-poisonousity pesticides have been developed, together with 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 turn out to be probably the most active areas in pesticide research currently.
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