Answers

2015-07-06T21:29:56+05:30
We know that soil has many kinds of nutrients and each nutrient is used for different crops. So if we plant only single type of crops, only same type type. of nutrients will be used up and other nutrients will not get used up. Therefore creating deficiency of single type of nutrient in soil.. as a result soil has to be left fallow for sme yrs to regain that nutrient
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