The potato yield factor is the product of the number of trees per unit area and the yield per plant. Yield per plant is determined by the number of potato plants per plant and the weight of individual potatoes. There is a contradiction between the increase in population and the increase in yield per plant. When the number of plants per unit area increased, the yield per plant decreased correspondingly, both of which had a certain dependency on the planting density. Within a certain density range, the yield of the population increased with the increase of the density; the yield per plant decreased with the increase of the density. Therefore, the determination of density must consider the harmonization of the two contradictory factors of population yield and individual yield. If the density is small, although the single plant is well developed and the yield is high, the yield per mu will not be very high because the total number of plants per unit area is small. If the density is too high, although the total number of plants is large, the single potato weight is very low and the same yield is not high. Therefore, the rational close planting is to make a reasonable group structure within the unit area, which can not only make individuals develop well, but also can exert the group's production increase effect, so as to make full use of light energy and land force, and thus obtain high yield. Considering the coordinated development of populations and individuals, the potato has about 6,000 plants per acre under the general cultivation level, and each plant has 2-3 stems.

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