As far as I know the soil need one whole year to regenerate it fertility. Because of this most farmers use a system of splitting up the their farms into 3 part and only use 2 for each season, thus leaving one to regenerate.
The answer to this question depends on many factors: soil quality, types of plants, rainy days and sunny days per year, etc. Different plants take different nutrients from the soil, and at different rates. Certain crops, like cotton, deplete the soil to such an extent that it may be wise to let the fields lie fallow once in awhile, as well as rotating crops. But there are many cases of farmers who never let a field “lie fallow” in the true sense and instead increase the soil’s fertility year after year. Masanobu Fukuoka, for example, plants rice and winter grain in the same field, sowing one before the other is even harvested in the fall and in the spring.
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