Experimenting the result expresses, the cultivation by direct seeding in sweet potato has to synthesize the advantage obviously (root system is prosperity, branch is many, the proportion of green leaf number and big sweet potato is high), can defer the sweet potato decrepitude, prolonging photosynthesis time, the living creature yield is high, the performance is good, can resolve the summer in summer harvest grow the physical labor strain to continue the problem that dry not easy sweet potato cuttage with the summer, promotingdevelopment livestock husbandry produce have very much the function