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块根类的形态建成与种子或果实的建成,有很大的差别。块根形成通常无一定的开始期,亦无一定的终止期。二次增厚的范围很大。所以块根的形状,大小差异很大。在农业上,块根类有很大的潜在生产量。它的形态建成的过程,开始期与终止期,要受外界环境及地上部的枝叶生长及开花结实的影响。容易人为的控制。如甘藷的块根的形成,要求较低的气温(尤其是夜间的温度),及较短的日照。每株块根可以重达30—40斤,也可以根本不膨大。
There is a big difference between the formation of tuberous species and the construction of seeds or fruits. Roots usually do not have a certain start period, there is no certain termination period. The second thickening of a large area. So the shape of the root, the size varies widely. In agriculture, root tubers have a great potential for production. The process of its morphogenesis, its beginning and its termination, are affected by the growth of the foliage and the flowering and fruiting of the external environment and shoots. Easy man-made control. For example, the formation of sweet potato tubers requires lower temperatures (especially at night) and shorter sunshine. Roots per plant can weigh 30-40 pounds, it can not expand at all.