NOVELTY - Planting water saving sweet potato, involves (i) cutting-out head and root of corn straw, removing hard peel of mid-corn straw to form wheat straw, and rice straw in inner core, cutting wheat straw and rice straw of inner core in small segment; (ii) seedling for 12 hours for planting sweet potato, placing on straw core, pressing, adding water, leaching straw core and soaking; (iii) cutting potato; and (iv) placing soaked inner core level of straw of step (ii) on bottom of pit of step (iii), seedling inner round hole of sweet potato on two middle straw core, and performing soil covering.    USE - For planting water saving sweet potato (claimed).    ADVANTAGE - The method saves water consumption; has planting seedling efficiency of 70%; is environment-friendly; generates good smoothness; and provides high nutrition value.    DETAILED DESCRIPTION - Planting water saving sweet potato, involves (i) first taking the corn straw, cutting-out head and root to produce a middle-of-line, then removing hard peel of the mid-corn straw, to obtain wheat straw, and rice straw in inner core, cutting the wheat straw and rice straw of inner core into small segment having the length of 8-10 cm; (ii) seedling for 12 hours for planting sweet potato, planting the cross section of straw core into inner container and taking straw core in upto 3/5 volume of container, placing on the straw core, and pressing the heavy object on the grate, adding water to the container upto the opening distance of 10 cm, then stopping addition of water, leaching straw core for 12 hours in a container, during leaching, soaking period when there is insufficient time to time, it was found that the water with the addition of water, ensures adequate water supply to the inner core to absorb the straw, finally leaching the straw, immersing straw core before finishing out sweet potato seedling; (iii) cutting the field in a diameter of 20 cm and depth of 8-10 cm; and (iv) placing soaked inner core level of straw of step (ii) on the bottom of pit of step (iii), where the placing direction of straw core is northwest to southeast, seedling the inner round hole of sweet potato on two middle straw core, seedling head of stem tip of sweet potato towards the south direction and the bottom of stem of the sweet potato at an angle of 45 degrees , covering seedling root part of the sweet potato and pressing, where the soil covering thickness is 3-5 cm.