Hybrid late rice has strict water requirements, and requires different amounts of water in different growth periods. In order to ensure the stable and high yield of hybrid late rice, scientific water management should be implemented for different growth periods. During the delivery period, shallow water ground irrigation is performed. In shallow water during the tillering period, ground irrigation can make the base of the late hybrid rice plants shine well, and sunlight can directly illuminate the base of the rice plant, increase water temperature and soil temperature, increase oxygen in the soil, promote root development, increase fertilizer absorption capacity, promote early-onset tillering, and improve Tillering rate. Irrigation depth, due to weather conditions, is generally 3 cm -5 cm, slightly cloudy with rainy weather, slightly higher temperatures in hot and dry weather is appropriate. The seedlings will be drained and put in time. In the late post-harvest period, when the hybrid late rice has reached 200,000 - 20,000 plants per acre, it should be promptly drained to control the invalid tillering, which is beneficial to the main stem and the big oysters growing faster and longer, so as to achieve a large ear and large panicle. The grain is full and the grain is high in weight. The fields should be characterized by weather, rainy weather, difficult fields, and a long time to put aside the fields. They should also pay close attention to early days of sunny field depots, or strive to clear the fields for sunny days; dry weather, water conditions are poor or lack of water, May be light or free of field. Spike differentiation period shallow water often irrigation. If the water is insufficient during the spikelet differentiation period, the number of spikelets will be reduced, resulting in the degradation of spikelets and the reduction of the number of grains per panicle. If the irrigation is too much, too deep, it will make the stem of the rice plant soft, easy to cause lodging, generally to maintain the water layer of 6 cm to 8 cm is appropriate; in case of dry weather, the water layer can be slightly deeper. Rainy weather or high groundwater levels, or fields with gluttonous rice seedlings, can be moistened and kept dry. Hybrid late rice is not resistant to low temperatures during the spikelet differentiation period. When strong cold air is encountered, deep water must be poured to maintain a certain deep water layer to stabilize the soil temperature and avoid low temperature affecting the development of young panicles. In case of typhoon floods, drainage should be conducted in time to wash the seedlings while draining, and the sludge on the stems and leaves of rice plants should be washed off. At the earing stage, the water layer was maintained. At the earing stage of booting, a deep water layer of 8 cm to 10 cm should be maintained to regulate the soil temperature and increase the air humidity between the plants, so as to promote the panicle 1 day to 2 days before the “equinoxâ€. In case of a cold shower, deep water should be filled to keep warm. Grout milk dry and wet alternating. Maize milk ripening period is a critical period for grain filling of late hybrid rice. If there is drought and water shortage, it will cause premature leaf sensation, photosynthesis efficiency will decline, and grain filling will be affected. If the deepwater layer is maintained, the oxygen in the soil will decrease, affecting the root activity in the later period, and it will also cause premature leaf failure, resulting in poor grouting. Therefore, it is advisable to keep the soil moist during the milk-growing period of grouting. The method of “running horse water†should be adopted so that the irrigation water does not accumulate water, the water-cut water does not lack water, and the wet and dry alternates. The temperature is dominant to facilitate grain filling. After the yellow ripening period, the water requirement is greatly reduced. In this period, avoid the accumulation of water in the field to promote maturity and facilitate harvesting. China Agricultural Network Editor
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