据Svensson(1966)报道,马铃薯生长和产量的变化主要取决于每一批种薯的特性。他认为,一批之中种薯间比重的差异代表着不同的化学组成和生理年龄。种薯的生理年龄是根据可见芽的发育程度来确定的,它能影响植株的茎数、产量和熱期。因此种薯比重对幼芽发育的影响既可改变密度和块茎的成熟度, According to Svensson (1966), changes in potato growth and yield are largely dependent on the characteristics of each batch of potato. In his opinion, the differences among the proportions of seed potatoes in a group represent different chemical compositions and physiological ages. Physiological age of seed potato is determined by the degree of development of the visible bud, which affects the number of stems, the yield and the heat phase of the plant. Therefore, the proportion of seedling on the development of young shoots both to change the density and maturity of tubers,