What is meant in farming by the four-course system of rotation of crops ?

This is a system which is in almost universal use and aims at securing the best possible yield from the soil.
It was found that if the same kind of crop were sown or planted year after year, the yield fell off and the land
became tired. After much experimenting the four-course system of rotation was settled upon. In successive
years the following crops are sown: wheat or oats, roots, barley, clover.

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