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Beginning of Paper
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Over the 10,000 years since agriculture began to be developed, peoples everywhere have discovered the food value of wild plants and animals, and domesticated and bred them. The most important crops are cereals such as wheat, rice, barley, corn, and rye; sugarcane and sugar beets; meat animals such as sheep, cattle, goats, and p ....
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Middle of Paper
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.... attention to reducing fertilizer loss, partly for environmental reasons but also because of fertilizer prices. The amount of water pollution contributed by fertilizer is generally low compared to other sources, and it can be reduced by avoiding excessive fertilization and by reducing soil runoff. Despite some pollution risks, the use of fertilizers, both organic and manufactured, is essential to enrich heavily used croplands.
Crop farmers must continually battle the insects and diseases that attack their plants. When used correctly and with care, chemical ....
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