The principle of rational irrigation of rice is: deep water returning to green, shallow moisture, sturdy water, strong and dry seeds.
Deep water returns to green. After transplanting rice, the root system is greatly damaged, and the ability to absorb water is greatly weakened. If the field lacks water, the water absorbed by the rice root will be less, and the leaves will lose more water, resulting in insufficient production. Lightly, the greening period is prolonged, and the weight is reduced. Therefore, after transplanting, the seedlings must be reclaimed in deep water to prevent physiological loss of water, so as to return to green early and reduce dead seedlings. However, deep water rejuvenation is not as deep as possible, generally 3 to 5 cm.
Shallow moisture. If the rice is too deep in the tillering stage, the soil is deprived of oxygen and gas, the nutrient decomposition is slow, and the light at the base of the rice plant is weak, which is unfavorable for tillering. However, there should be no water layer during the tillering period. Generally, a shallow water layer of 1.5 cm depth should be filled, and the “post-water can not be seen before the water†should be used to coordinate the contradiction between water, fertilizer and heat in the soil.
There is water and strong. The period of rice ear formation is the most demanding stage of rice in the whole life, especially in the meiosis stage, which is more sensitive to the response of water. At this time, if water is scarce, the spikelets will be degraded, resulting in short spikes, few grains, and more shells. Therefore, during the period from the straw to the heading, it is necessary to maintain a water layer of about 3 cm in the field to ensure the growth of the flowers.
Dry and wet seeds. After rice heading and flowering, the leaves stop growing, the stems and leaves no longer elongate, the floret development is completed, and the water requirement of the seedlings is reduced. In order to strengthen the field ventilation, reduce the occurrence of diseases, improve the vitality of the root system, prevent the premature senescence of the leaves, and promote the robustness of the stalks, the method of pipe drying should be adopted: dry and wet, wet and water-based, to achieve water regulation, gas cultivation, Root preservation leaves, the purpose of leaves strong seeds.
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