马铃薯植株的生长曲线可分成3个时期: 1.叶的形成为植株已经达到的发育程度的函数。 2.块茎的发育系由于匍匐枝顶端碳水化合物的高浓度以及较强的光照和低温所引起。 3.块茎的生长与叶片的保持有关。块茎的早期生长可能阻止叶片的扩展。这种情况大多数会造成减产的后果。块茎已经形成以后,用尿素喷射,可使叶的功能延长。 The growth curve of potato plants can be divided into three periods: 1. Leaf formation as a function of the degree of development that the plant has reached. Tuber development is due to the high concentration of stolons at the top of the carbohydrate as well as the strong light and low temperature. 3. tuber growth and leaf retention. Early tuber growth may prevent the expansion of leaves. Most of this will result in a cut in production. After the tubers have been formed, spraying with urea can extend the function of the leaves.