sentences: harvest the same sow every second increase the rough required by that mean of sow & hay is a mean of sow ->  planting corn every year decreases the nutrients required by corn to grow  planting corn every year decreases the nutrients required by corn to grow & hay is a mean of sow & as the takes of thunder in sand increase , the sow nonproductive will increase -> planting corn every year decreases the crop production because of decreased nutrients in soil