Soil Moisture Analyzer for Analysis of Water Demand of Potato

Water is the main component of plant tissue structure, and many physiological processes depend on it, which is very important for plant growth. However, the water needed by plants is also within a certain amount. If water stress occurs, one or more physiological processes will be inhibited or stopped. For example, transpiration, photosynthesis, etc. will be affected. Compared with other crops, potato is less sensitive to water stress. In order to reduce potato yield loss caused by water coercion, the frequency of potato irrigation is more than tomatoes, corn, and sugar beets, indicating that potato is a hi wet crop. The determination of moisture in soil can generally be measured using a soil moisture meter.

The soil moisture tester measures the content of soil moisture and analyzes the growth status of the potato. Planting tubers in arid soil will inhibit the emergence or non- emergence of seedlings, hinder or even stop the growth of roots, resulting in asexual growth period. Shortened, this condition generally affects the number of stems. Seeding under severe drought conditions and irrigating at the time of emergence will significantly delay the tuberization time and shorten the tuber formation period. Compared with the constant high soil moisture, 20% to 30% of soil drought within 24 days after emergence. , and then irrigation, will initially reduce the leaf area, but later will increase the leaf weight. Soil drought delays tuber. However, some researchers believe that there is a negative correlation between stem and leaf growth and tuber growth. For example, inhibition of stem and leaf growth will promote the development of tuber. Soil drought at the beginning of tuber will reduce the number of tubers per plant, and the higher soil moisture at the early stages of growth will accelerate aging, especially under drought conditions.

The length of the maximum potential growth of the tuber day is determined by the duration of the ridge closure. Water shortage during this period will speed up the aging of the potato. The drought after flowering has the same result, and the late water coercion also has such effect. From the bottom of the plant, the leaves wilted and yellowed until they fell off. At the same time, the drought also inhibited the formation of new leaves. In the early stages of tuber enlargement, the above mentioned conditions may also change due to the occurrence of secondary growth. After experiencing a period of drought and high temperature, sufficient water will be obtained and the growth of the shoot will be promoted, resulting in the formation of bunches of potatoes [19, 20]. The secondary growth of potato leaves is much more abundant than the leaves without this stage. During senescence and maturation, the more drought, the faster the aging. Throughout the growing season, if the drought is not severe, it will extend the period of asexual growth.

The soil moisture tester analyzes the relative changes in soil moisture, and proposes relevant measures for the soil moisture content in combination with potato growth stages. Drought treatment is carried out 12 to 36 days after emergence (soil moisture is 20% to 30% WHC). Then, the soil moisture was increased to 80% to 100% WHC, and the yield after this treatment was higher than the yield obtained when the soil water holding capacity remained high. The reason is that the rate of net assimilation of potatoes after drought-resistant exercises is higher than that of potatoes that have been under wet conditions. The mechanism of this drought-resistance effect may be that stomata is insensitive to drought.

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