Negative pressure irrigation system and method

Abstract

The invention relates to a negative pressure irrigation system and method. The system comprises a negative pressure underground irrigation device and a negative pressure regulator. The negative pressure underground irrigation device irrigates crops under the action of negative pressure. The negative pressure regulator automatically regulates negative pressure of the system. A soil humidity sensor is used for monitoring water content of soil in real time, the real-time soil water content and expert's information about current actual water demand of crops are combined in a controller, and an optimal irrigation strategy is formulated. A step motor is driven for direction and speed regulation according to the optimal irrigation strategy, vertical position of a lift table is controlled, the position of a water supply unit can be regulated, water supply suction of the system is dynamically regulated, and accordingly the soil water content is dynamically regulated so as to truly supply water according to demands of the crops.

Description

technical field [0001] The invention relates to a negative pressure irrigation system and a method thereof, in particular to an underground irrigation system and a method thereof which can automatically regulate negative pressure. Background technique [0002] Negative pressure underground irrigation technology is a new type of water-saving active irrigation technology proposed for greenhouse potted crops. This technology buries the emitter deeply at the bottom of the basin, and uses the physiological characteristics of crop water and soil capillary suction to automatically infiltrate the water in the emitter into the soil, thereby forming a negative pressure in the water delivery pipe. Under the action of atmospheric pressure, water is pressed from the water supply into the water pipe to replenish the water flowing into the soil from the irrigator, thus ensuring the uninterrupted operation of the entire system, realizing the continuous and automatic acquisition of water by ...

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Problems solved by technology

[0003] In the prior art, the suction of water supply is basically fixed, which leads to the following problems: (1) The crops have different demands for water in different growth stages, but the existing negative pressure irrigation system cannot supply water to the crops according to the requirements of the crops. Supply based on demand, which will not achieve the best irrigation effect, but also lead to low water utilization rate, resulting in waste of water resources; (2) A negative pressure irrigation system is only suitable for one or several crops with similar habits , can not be widely used in various crops, when other crops adopt the irrigation system, it needs to be improved to meet the needs of different crops, the work is cumbersome, inefficient, and also leads to an increase in costs

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