Cultivation practices on fresh sweetpotato were conducted on both farmland and interplanting poplars field with three factors of cultivar, planting density and potassium fertilizer. It was different in composition of marketable root yield among three cultivars. Ningshu 192 was a kind of root-weight type cultivar which gave high ratio of marketable root yield. Ningzi 1 was a kind of root-number type cultivar which gave lots of small root. Jishu 18 was the intermediate which gave higher ratio of marketable root number following a better cultivation method. On farmland the high marketable root yield were harvested through planting density 1 hm 2 48 000 cuttings and more application of 225 kg/hm potassium sulfate fertilizer. The fresh sweetpotato production was unavailable on the interplanting poplars field due to very low marketable root yield.
