Study on Optimum Cultivation for New Sweet Potato Variety Xushu 22 with High Fecula

The high-yielding cultivation model for Xushu22 was established by means of quadratic orthogonal regressive rotation design with five factors and five levels.The effects of five factors on the yield were: potassium sulfate urea density calcium superphosphate transplanting date.The optimal agronomic conditions were as follows:applying urea 3.505～8.605 kg/667m2,phosphorus 31.860～39.750kg/667m2,potassium 23.400～35.900kg/667m2;density 3644～4296 stems/667m2;transplanting date 5/13～5/17 and the yield was up to 4000～4500kg/667m2 according to the computer simulation.