The appropriate sweet potato planting density should be determined according to the characteristics of sweet potato varieties, soil fertility, planting time and the length of growth period.
The principle of determining the planting density of sweet potatoes is: the long vine cultivars should be thin, and the short vine cultivars should be dense; the water and fertilizer land should be thin, the thin and dry land should be dense, the fertilization should be thin, and the fertilization should be less dense; the early planting should be thin; the late planting should be dense. The growth period should be thin; the growth period should be short. However, care should be taken not to over-close the plant; According to experiments, when the planting density per mu is more than 6,000, the yield has a downward trend; if the density is too thin, the yield will be reduced if it is less than 2,500, and the yield is reduced by 13.9% when 2,000 acres are planted.
According to the actual production of sweet potato, the average seedling planting density is 4000 when the yield is higher. Spring potato planted 3500-4000 plants per acre; summer plants planted 4000-4500 plants per acre. When the fertility in the plain area is better, the suitable planting density is 3000-3500 strains of spring potato, 3500-4000 strains of summer potato, and 4000-4500 strains of spring potato in dry hills.
In addition, the planting density is also related to the quality of sweet potato seedlings, planting methods, etc. In production, the planting density must be reasonably determined according to the principle of species, origin, season, and conditions.
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