Constant negative pressure irrigation system applied to agricultural irrigation

Abstract

The invention discloses a constant negative pressure irrigation system applied to agricultural irrigation. The constant negative pressure irrigation system comprises an irrigation head, a water storing device, a negative pressure adjusting device, a second negative pressure chamber and a communicating pipe, wherein the negative pressure adjusting device comprises a U-shaped pipe and a negative pressure adjusting pipe respectively communicated with a left side pipe and a right side pipe of the U-shaped pipe; a first negative chamber is formed between the upper side of the liquid surface of irrigation water stored in the water storing device and the top of the water storing device; the lower part of the water storing device is communicated with the second negative pressure chamber by the communicating pipe; the bottom of the water storing device is communicated with the irrigation head; the irrigation head is placed at the position of soil where a crop root system is grown; the left side pipe of the U-shaped pipe is communicated with and extends into the second negative pressure chamber by a through hole formed in the top of the second negative pressure chamber; the right side pipe of the U-shaped pipe is communicated with atmosphere. By applying the constant negative pressure irrigation system applied to the agricultural irrigation, the constant negative pressure irrigation can be realized, and the utilization rate of irrigation water is improved.

Description

technical field [0001] The invention relates to agricultural irrigation technology, in particular to a constant negative pressure irrigation system applied to agricultural irrigation. Background technique [0002] The water transpired by crops during their growth and development is often hundreds or even tens of thousands of times their own biomass, and the soil is often difficult to provide the water necessary for the growth and development of crops. Therefore, in the process of modern agricultural production, it is an essential agricultural activity to replenish water through irrigation to meet the water demand of crops. [0003] In the prior art, irrigation is the basic means for regulating the soil moisture status of crop growth, and there is always a certain time interval between two irrigations, which is a pulsed irrigation method. During this process, the soil moisture content exhibits pulse-like changes, that is, the soil moisture content suddenly jumps to saturatio...

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Problems solved by technology

[0008] It can be seen from the above that in the existing irrigation system, the water potential of the irrigation head is related to the air pressure and volume reserved in the negative pressure chamber and the water potential generated by the irrigation water in the water storage. As the volume of irrigation water decreases, the water potential of the irrigation head also increases. In this way, when there is still a certain amount of irrigation water in the water storage tank, the water potential of the irrigation head is balanced with the water potential of the soil, thereby stopping the water supply to the soil, resulting in a shorter irrigation time and low water use efficiency; further , in the equilibrium state, that is, when there is irrigation water in the water storage, it is necessary to refill the irrigation water in the water storage and set the reserved space and the air pressure in the reserved space, and the number of irrigations required is more. It takes more time and manpower, which makes the irrigation cost higher

Moreover, during the irrigation process, as the amount of water in the water storage decreases, the water potential of the irrigation head fluctuates to a certain extent, which cannot ensure that the crops are always growing under stable and optimal soil moisture conditions.

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