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Crop rotation :
 the changing of crops in order or sequence to decrease the population level of pests . it is also used to control pests and dieseases that come in soil during a short period of time 
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crop rotation-
it is the practice of growing different types of crops in different seasons on the same land, on rotational basis, to replenish the soil with nutrients.
for example- farmers grow wheat crop alternately with leguminous crops.rhizobium in the root nodules of this plant replenishes nitrogen content of the soil and increase its fertility.
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