Water level and water quality layering control weir of drainage ditch of rice field

Abstract

The invention relates to a water level and water quality layering control weir of a drainage ditch of a rice field. Three types of five weir plates in different heights are designed according to the characteristics of each growth period of rice; the heights of the five weir plates are determined according to the buried depth of underground water required by the rice in different growth periods; by combining the five weir plates, outlet control weirs in different heights of the drainage ditches can be formed, and the drainage control requirements of rice reviving, early stage of tillering, late stage of tillering, booting stage, tasseling stage, milky ripeness stage, yellow ripening stage and late stage of fertilizing; two hand grabs are arranged on the lateral surface of each weir plate; an arc rubber waterstop band is arranged at the bottom of each weir plate which ensures overall seamless joint water stop among the weir plates; doorframe grooves are arranged on two sides of the drainage ditch; rubber waterstop bands are arranged on two sides in the doorframe grooves; the weir plates can be slidingly taken out or placed into the frame grooves and cannot leak water; two pull rod handles for taking and placing the weir plates are additionally arranged; and rhombus rings of the pull rod handles can be sleeved with hand grabs on the weir plates to place or take out the weir plates from the doorframe grooves on two sides of the drainage ditch. The invention has the advantages that the combined height of the weir plates cannot cause the flooding damage on the rice, can be used for retaining nitrogen, phosphor and other nutrients in the rice field and reducing the pollution of high-concentration nitrogen and phosphor in the drain to a water body. The invention saves the water consumption for irrigation, improves the utilization rate of underground water resources, has favorable waterstop effect among the weir plates and is convenient to manually operate.

Description

technical field [0001] The invention proposes a paddy field drainage ditch water level and water quality layered control weir installed at the outlet of the farmland drainage ditch, which belongs to the technical field of agricultural water and soil engineering. Background technique [0002] In the vast humid areas of our country, the buried depth of groundwater is relatively shallow. By regulating the groundwater level of farmland and using the capillary water rise of groundwater to supplement surface soil moisture is an important way to improve the utilization rate of water resources. In the season when the rainfall exceeds the evapotranspiration of paddy fields, the groundwater level rises. In order to meet the needs of rice growth and paddy field leakage, measures should be taken to reduce the groundwater level of paddy fields. In the season when the evapotranspiration exceeds the rainfall in the paddy field, the water in the surface layer of the soil is in short supply....

AI Technical Summary

Problems solved by technology

The traditional water level control of the drainage ditch is realized through the gate or control weir at the outlet of the drainage ditch. Since the gate is a bottom hole, it is difficult to maintain the water level of the drainage ditch at a certain height by using a manual control gate. The cost and expense of automatic control are too high and unaffordable

Although the fixed-height control weir is widely used at home and abroad, it can only maintain a fixed water level in the drainage ditch, and cannot meet the needs of the groundwater level at different growth stages of rice and the control drainage requirements after fertilization

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