In general, water shortage in paddy fields cannot be premature, and it is better to cut off the water 7 days before harvest. In terms of production, it can be flexibly controlled according to the soil moisture, weather conditions, rice maturity, and post-cultivation seedlings.
During the middle and late stages of rice filling, generally, as long as the soil in the field is moist, rice roots can absorb enough water to meet the grouting needs. If the soil is too dry, the water shortage in the rice plant will affect the grain filling of the rice, and even cause the branches and stems to be withered, the grouting will be insufficient, the grain weight will drop, and the yield will eventually drop. In later stage, rice with better root growth had stronger water absorption ability (live-seeded rice still had more white roots and strong root activity), and the dry soil could also satisfy the grouting water requirement. In later stage, rice roots with poor root growth have weak water absorption capacity (hand-planted rice, especially early-season paddy rice, generally has less white roots and weaker vigor), and a relatively moist soil environment is conducive to the roots absorbing enough water to meet The grouting needs water, and the intermittent water in the field cannot be premature. In addition, there are great differences in soil water retention in different plots. In general, early water cuts are appropriate for paddy fields, but water quality is good. In poorly drained plots, if the roots of rice plants grow poorly, the soil moisture in the fields is relatively low. Large, water cuts should not be premature.
When the temperature is lower than 15°C, the root activity of rice will be greatly reduced and the water absorption capacity will be weak. If the soil temperature is lower than 15°C for a long period of time, for example, a few days of low-temperature and rainy weather, the water absorption capacity of rice roots is almost lost. At this time, if the weather turns suddenly clear and the temperature rises suddenly, the green rice leaves lose water in a large amount and the root system cannot absorb water or Less water absorption will cause physiological water loss in rice plants, and light yellow rice leaves, some branches and stems will die, while rice will cause the whole plant to die, grouting will stop, and the significant decrease in the number of thousand grains, resulting in serious yield loss. Direct seeding, earing and maturation of wheat in direct seeding in Huaibei area of ​​Fuyang and other regions were late, and cold air in the north was frequent in the middle and late period of grouting. Physiological blue-green phenomenon was prone to occur. These plots should pay special attention not to prematurely cut off water. Before the rice grouting is basically completed, it is generally advisable to irrigate and incubate water immediately before each low temperature, which will help maintain the soil temperature and reduce the occurrence and damage of physiological blue-green.
Too late to mature rice, Teng Yu late, in order to avoid the rice soil after harvest is not conducive to timely sowing of wheat, etc., can be considered appropriate early break water according to the specific circumstances. When the daily average temperature is stable below 15°C, even if the rice leaves do not die, they remain green and generally cannot be refilled. The dry matter in the field rice no longer increases and the yield is basically determined. Generally, by the end of October, the average daily temperature in Fuyang and other Huaibei regions will be stable below 15°C, and rice will no longer be filled with groats. At this time, in order to facilitate post-planting of wheat and other seeds, it may be considered to cut off water as soon as possible. Of course, in different years, the temperature, rain conditions, etc. will change, should be based on the weather forecast, the field of rice growth and other flexible conditions, to minimize the loss of rice yield and to fight the wheat early sowing, early emergence.
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