Question

Ms gupta grew wheat crop on his field continuesly for ten years he found that gradually the yeild decreased why do you think this happen

Answer 1

Because of using too minerals from soil

Answer 2

The main reason for this is that the soil got low on the nutrient required by the wheat crop.As a specific type of crops requires some specific nutrients to grow so when the crop is grown regularly on the field without letting​ the soil refill that nutrient the yield will definitely decrease