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在青南高寒牧区播种期是影响莞根产量的最关键因素，秋季降温是决定完报停止生长的主要因素，气温日较差大是莞根获得高产的重要原因。青南高寒地区降水量基本满足莞根生长对水分的需求，莞根可以在海拔高度4500m以下较平坦、气候条件相对较好的地区种植，并可获得较高的产量，这对大力发展人工青饲料，指导畜牧业生产具有重要的现实意义。
The sowing date in Qingnan alpine pasturing area is the most important factor that affects the yield of sweet potato. Autumn cooling is the main factor that determines the ending of growth. The bad day temperature is the main reason for the high yield of sweet potato. Precipitation in the alpine area of Qingnan basically meets the demand for water from the growth of Wandan root. Wandan can be planted in a relatively flat elevation area with a relatively good climatic conditions at 4500m above sea level and obtain higher yield. This is of great significance to the development of artificial green fodder, Guidance of animal husbandry production has important practical significance.