Automatic irrigation-drainage system for farmland

Abstract

The invention relates to an automatic irrigation-drainage system for farmland. Irrigation water enters a water level control pond through a water level control valve; a floating ball drives the water level control valve to regulate the water supply amount until the supplied water is equal to the consumed water; the water level is stabilized at a certain water level when the water supply of the water level control valve is stopped at a water supply water level h1; the irrigation water enters a soil filling region at the upper part in a U-shaped concrete groove through a nonfine concrete cover plate and a sand inverted filter from the bottom of the inner part of the U-shaped concrete groove so as to form a soil saturated water layer lower than h1; the water in the saturated water layer is raised to the root layer of the crop in the form of capillary water; the water supply amount is increased or reduced along with water consumption amount so that the farmland is automatically irrigated;because the h1 is lower than the height h2 of the upper edge of the U-shaped concrete groove, no gravity water is leaked; once the soil saturated water layer is higher than the h1 because of raining,the water level control valve is turned off, the irrigation is stopped; if the water layer is higher than the upper edge h2 of the water level control pond, the water overflows to a water accumulation pond, and the water begins to be discharged; and the irrigation is recovered until the soil saturated water layer is lower than h1. The system has full automatic irrigation, high reliability and excellent durability.

Description

Technical field: [0001] The invention relates to a farmland irrigation and drainage technology, in particular to an automatic farmland irrigation and drainage system. Background technique: [0002] The existing automatic irrigation system needs to calculate and predict the appropriate irrigation time and irrigation amount by detecting plant physiological parameters, soil moisture parameters and many meteorological parameters. , the equipment is expensive, it is difficult for farmers to accept it, and it is also very difficult to popularize it. In addition, the existing automatic irrigation system only focuses on the decision-making of the appropriate irrigation time and water volume, while ignoring the important field irrigation link, that is, it cannot solve the ineffective evaporation of ground irrigation, nor can it solve the deep problem of underground irrigation (seepage irrigation). Leakage, ineffective irrigation and nutrient loss due to irrigation methods, irrigatio...

AI Technical Summary

Problems solved by technology

[0002] The existing automatic irrigation system needs to calculate and predict the appropriate irrigation time and irrigation amount by detecting plant physiological parameters, soil moisture parameters and many meteorological parameters. , the equipment is expensive, it is difficult for farmers to accept it, and it is also very difficult to popularize it

In addition, the existing automatic irrigation system only focuses on the decision-making of the appropriate irrigation time and water volume, while ignoring the important field irrigation link, that is, it cannot solve the ineffective evaporation of ground irrigation, nor can it solve the deep problem of underground irrigation (seepage irrigation). Leakage, ineffective irrigation and nutrient loss due to irrigation methods, irrigation efficiency has not been fundamentally improved

Poor durability and low reliability, especially for underground irrigation systems, because of clogging, the service life generally does not exceed 10 years, usually 4 to 6 years

Too short service life, too high investment, operation, and maintenance costs make the water saving benefits far lower than farmers' expectations, which greatly hurts farmers' enthusiasm for use

Irrigation time and irrigation volume are generally realized by switching on and off the water pump to control when to pressurize and how long to pressurize, further reducing energy consumption, and there are technically insurmountable obstacles

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