Main crop varieties Mira and 783-1 with 3 plant density treatmentswere used in the experiment and the results showed that the numbers of mainstems and tubers increased as the number of plants per unit area increased.

• 主栽品种 Mira 和783-1各3种密度的试验结果表明,随着单位面积播种密度的增加,单位面积上的主茎数及块茎数目均增加,而块茎的平均重量及大中薯率则减少。