First, the heading and flowering period - shallow water irrigation. There is a great demand for water in the late flowering stage of late rice, especially hybrid late rice. In this period, paddy fields need to be filled with shallow water. When the weather is fine and the temperature is high, the field should generally maintain a shallow water layer of about 3 cm; in rainy days, it can be drained and dried to keep the field moist.
Second, the grouting period - irrigation "horse water". After the late rice enters the filling and filling period, it should be based on the “running horse waterâ€, dry and wet, mainly wet. Generally, the water is first poured once, let it dry naturally, and then water once every 1-2 days. He repeated several times, so that pension rice flowing water, about seven days before harvest without water is appropriate.
Third, encounter low temperature cold damage - deep water insulation. Late rice is often affected by low temperature chilling damage during the filling stage of the flowering stage, which affects the filling and firming. When this happens, the water can be kept for a short time, and the water layer is generally about 10 cm. When the temperature rises after the cold air, the normal irrigation is resumed. If the weather is fine during the day, you can also take the night irrigation method to increase the temperature of the paddy field and reduce the cold damage. Fourth, the rice paddy that broadcasts green manure - flexible irrigation. For the late rice fields with green manure, the symbiotic period of late rice and green manure lasts for about 1 month. To solve the contradiction between water requirement for late rice and green water and water, it is necessary to adopt a flexible irrigation method to make the growth of rice and green manure. First of all, it is necessary to promptly clear the drainage ditch in the field and master the initiative of irrigation and discharge. Then, according to the weather and soil conditions, the water is flexible, the soil is sticky, the rainy weather is more, and the irrigation can be less or not; if it is sandy or the weather is relatively dry, the number of irrigation should be increased appropriately. Irrigation should also be "Happy Valley water" mainly to the field moist but not water is appropriate.
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