Potatoes need more water for growth and development. For each dry matter formed, about 400 pounds of water is needed. In the early stages of germination and seedlings, the water needed by the tuber itself can be used for seedling. For example, if the soil moisture after seeding is too small, the sprouting sprouts cannot excavate the soil and many juvenile potatoes are formed. When the drought is severe, the tubers are shrunk and the seedlings are thin, while the weight is not. From the bud to the flowering stage is the period of rapid tuber enlargement, the maximum water demand, such as the lack of water during this period, will affect the formation of tubers, or the cork cells of the tuber epidermis, so that the potato skin aging and forced mature. In case of good rain conditions, plant photosynthetic activity is re-energized, nutrients are transferred to the tuber, and the tuber grows again. The phenomenon of “spring down†occurs, also called secondary tuber. Because the original tuber has become inflated, only the stems from the buds with meristems have formed, and they have grown into new tubers and some have become stringy. During the growth period of the potato, the soil moisture in the 0-40 cm tillage layer reached 60%-75% of the maximum water holding capacity in the field, and the plant growth was normal. In case of excessive rainfall during the growing season, not only the lower leaves of the plants turn yellow and die, affecting the yield, but also easily causing late blight, causing tuber rot in the field or difficulties in storage.
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Water management in potato development is key
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