Water is an indispensable substance in the life activities of crop organisms. Therefore, we must understand the law of water demand, and create conditions to meet its water requirements in order to achieve high yields. The somatic cells and tissues of the potato must have a moderate amount of moisture. Under normal moisture conditions, the aboveground and underground parts can develop in equilibrium and assume a normal form. From the standpoint of improving photosynthetic efficiency, it seems that shoots and shoots on the shoot should be enlarged and expanded to increase dry matter production. From the standpoint of water physiology, it seems that shoots on the shoot should be small and underground roots should be large to reduce the loss of water. Expand the absorption area of ​​the root system. How to adjust the relationship between the aboveground and underground is an important key to obtaining high yield of potato tubers. For the moisture content in the soil, a soil moisture meter can be used for the determination.

The analysis of soil moisture at different stages of potato growth by the soil moisture quickness tester found that the demand for water is different. For example, in the middle of the irrigation area, due to the high groundwater level and sufficient bottoms, there is no need for irrigation before and after sowing. During the period of apparent budding of potato, the plants grow faster, the potato needs high amount of water, and there is an urgent need. The local also has the experience of “flower water” irrigation, and timely irrigation can promote the proliferation and expansion of the assimilation area of ​​the aboveground part; on the other hand, it can also reduce the temperature. , favorable tuber development. After the potato is sealed, the evaporation on the ground is reduced. Irrigated or not, depending on soil moisture. In the “rain-fed agriculture” region of Ningnan, there is little drought in the spring. In order to guarantee the complete emergence of potatoes, in addition to the selection of wheat stubble which is thick and well-preserved, it is advisable to use ploughs to open the ditch when sowing, and to step on the potato block with the feet. It is closely connected with wet soil to prevent running. There are also drought-resistant sowing techniques such as sowing of small sweet potatoes, drying and planting, greening, budping, and cutting of top buds.

Potato is a drought-tolerant crop. Under the study of the soil moisture quickness tester, it was found that due to lack of irrigation conditions, limited natural precipitation is mainly achieved through the use of drought-resistant cultivation techniques of “fat-saving water”. the goal of. Fertilizer has always attached great importance to potato fertilization, generally 6,000 to 8,000 jin per acre of high-quality fertilizer, or even ten thousand kilograms, because of the increase of high-quality agricultural fertilizer, can play a limited potential for natural precipitation, in order to increase potato production, according to research reports, arid areas, Semi-dry early-growing potato production 1 kg of dried potato (4 kg of fresh potatoes is equivalent to 1 kg of dried potatoes) water consumption coefficient of 0.72mm, is lower than the same fertility level of cereals like spring wheat, wolfberry fruit is much lower.