Due to the increasingly tense water resources in recent years, rice farmers are eager for water, while Others mistakenly believe that regular irrigation will reduce the water temperature and affect the normal growth of rice, so it will sew dead water (in the middle and late period of rice water, no irrigation or no drainage). It is believed that this will not only ensure the moisture supply but also increase the water temperature. The opposite is true for rice. Rice is either lodging or disease. Not only does it prevent production, but rice quality is also greatly reduced. The reason is: Rice water needs include physiological water demand and ecological water demand. Physiological water requirement is to maintain its physiological activity and maintain the body's water balance, ie, photosynthesis and the water needed for transpiration; ecological water requirement refers to the water needed to adjust the ecological conditions of rice, such as water, fertilizer and gas in the soil. In the microclimate of the field, water is used to keep warm at low temperatures, and water is used for cooling at high temperatures. The long-term circumfluence of water violates the objective requirements of rice growth and development on the environment, there are the following drawbacks. 1. The dead water in the circle causes the temperature of the water in the field to rise, which can easily cause rice growth, misalignment between roots and crowns, and make the rice plants too luxuriant. The young physiology organization is easy to induce sheath blight, rice false worm and rice borer, rice borer, rice leaf roller and other pests and diseases. At the same time, rice roots are prone to premature aging and are prone to lodging, resulting in reduced yields and reduced quality. 2. The solubility of oxygen in water is inversely proportional to the water temperature. When the water temperature rises, the oxygen content of the water decreases; the water temperature is high, the microorganisms in the paddy field are active, the respiration is enhanced, and a certain amount of oxygen is also consumed, eventually leading to hypoxia in the rice rhizosphere and increase in toxic reducing substances (such as ferrous ions and sulfides). Hydrogen, etc.) The lack of oxygen in the rhizosphere produces anaerobic respiration, resulting in alcohols, biogas, organic acids, etc. These substances in turn have a toxic effect on the root system of rice, making the rice root black and rot. Absorption capacity is greatly reduced, and the supply of nutrients to the aboveground parts is limited, resulting in weak growth of rice. Even premature aging, lodging. 3. The high temperature of paddy fields, the enhanced respiration of rice itself, the large consumption of organic nutrients in the body, is not conducive to the accumulation and transport of dry matter, thus reducing rice yield. Rice is native to swamps and is suitable for growing in shallow, wet and dry environments. The perception that "rice has blisters" is wrong. The correct irrigation method for rice should be: shallow irrigation, string irrigation, late water-cutting, that is, shallow moisture enthalpy (3.5 cm), seedlings enough to dry the field (Sun 5-7 days, to the surface of the soil "chicken paw", white root On the back, rice leaves were washed and the leaf color became lighter as the standard), shallow water was raised (3.3-5 cm), shallow, wet, dry alternately grouted, and water was cut off 7 to 10 days before harvest. During irrigation, all corners of the grid are required to flow, leaving no dead ends. During the middle and late stages of rice growth, vegetative bodies increase, genital organs form, and the root system reacts more sensitively to oxygen. This is accompanied by a high temperature season; rice fields Can't circle water.
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