Using orthogonal design,the of root or minituber size, planting density and cultivar maturity on tuber yield,tuber number per plant and the ratio of small tuber(<259)to total tubers was studied. The results shown that when.the planting densities were more than12000plants/ mu and 10000 ̄12000 plants/ mu for early maturing cultivar,and late andmiddle-late cultivars, respectively,and the minituber size was larger than 0.5g per tuber,hightuber yield. high propagation coefficient and low seed quantity can be obta...