Follow the principle of irrigation to promote high rice yield
The principle of reasonable irrigation of rice is: deep water returns green, shallow moisture, strong water, dry and wet and strong seeds.
Deep water returns green. After transplanting rice, the root system is greatly damaged, and the ability to absorb water is greatly reduced. At this time, if there is a lack of water in the field, the rice root will absorb less water, and the leaves lose more water, resulting in insufficient income. From the light to the prolonged green period, the weight of the dead leaves is heavy. Therefore, the seedlings must be returned to deep water after transplanting to prevent physiological loss of water so as to return green earlier and reduce dead seedlings. However, deep water returns green is not the deeper the better the irrigation, generally 3 to 5 cm can be.
Shallow moisture. If irrigation is too deep during the tillering period of rice, the soil is anoxic and the nutrient is decomposed slowly, and the light at the base of the rice plant is weak, which is unfavorable for the tiller. However, during the delivery period, there must be no water layer. Generally, a 1.5-cm-thick shallow water layer should be filled and the water should not be seen before, in order to coordinate the contradiction between water and fertilizer in the soil.
Strong water. Rice ear formation period is the most water demand stage in rice life, especially in the meiosis period, it is more sensitive to the water reaction. At this time, if there is water shortage, the spikelets will be degraded, resulting in short spikes, few grains, and more empty shells. Therefore, during the period from booting of rice straw to heading, it is necessary to maintain a 3 cm layer of water in the field and increase grain growth.
Wet and dry seeds. After heading and flowering of rice, the leaves stopped growing, the stems and leaves no longer elongate, the development of spikelets was completed, and the water requirement for seedlings decreased. In order to strengthen air permeability in the field, reduce disease occurrence, improve root vitality, prevent premature leaf decay and promote sturdy stalks, dry and wet-wet and wet-based methods of water management should be adopted to achieve gas regula- tion and gas rooting. Root protection leaves, with the purpose of seedlings.
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