Two tillage\|free methods using two kinds of tillage\|free reagents were tested in a fixed site for three years.The results showed that,the grain yields using direct sowing or direct transplating were increased by 8 0%-20 9% to compare with CK treatment(tillage),except the treatment of direct transplanting at the third year which was decreased by 6 7%.The economical benefit of tillage\|free treatments was also improved by 37 7%-126 2%.After a 3\|year tillage\|free cultivation,the total porosity of t...