Over long time, human meals and clothing depended primarily on agriculture. While ever since the historical time, agriculture had always relied on numerous human labor, which was topic to varied kinds of natural conditions. So the development of agriculture was very slow. Throughout the 19th century, the usage of 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 of the measures to increase the agricultural production, the position performed by chemical fertilizers is forty% to 65%. On the basis of the booming within the petrochemical industry, synthetic ammonia and urea have realized large-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 earth amounted to approximately 140 million ton, which made it develop into one of the bulk chemical products. In recent years, the development of nitrogen, phosphorus and potassium compound fertilizer and trace elements fertilizer has additional meet the calls for of various soil structures and completely different crops.

In the early interval, individuals used natural animals, plants and minerals to stop and deal with crop pests and diseases. Till the late nineteenth century, after the formation of contemporary chemical industry, individuals started to use arsenic preparation to kill beetles on potato, and use Bordeaux mixture to prevent and treat downy mildew on grapes, in order that agriculture started a new era of chemical prevention and treatment. In the course of the Forties, loads of pesticides and herbicides, resembling organic chlorine, natural phosphorus, had been produced and widely used in agriculture, forestry, animal husbandry and public health. Nonetheless, a number of the pesticides throughout this interval have been rich in residues or poison, which caused ecological air pollution, so that they had been banned by many countries.

In recent times, a number of efficient, 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. Because of this, bio-pesticides have change into essentially the most active areas in pesticide research currently.

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