Water, fertilizer and gas integrated trickle irrigation system and method

Abstract

The invention relates to a water, fertilizer and gas integrated trickle irrigation system and method. The trickle irrigation system comprises a water supply pump, wherein the water supply pump is connected with a mixing tank which is provided with a float ball water level gauge; a pH sensor, an EC (Electric Conductivity) sensor and a DO (Dissolved Oxygen) sensor are arranged in the mixing tank; a water outlet pipe of the mixing tank is connected with a pipeline pump through a two-way solenoid valve; an outlet of the pipeline pump is connected with a three-way solenoid valve; one outlet of the three-way solenoid valve is connected with a mesh filter; another outlet of the three-way solenoid valve is connected with branch pipes of a plurality of Venturi fertilizer injectors; an outlet of each branch pipe is connected with the mixing tank; a liquid inlet of each Venturi fertilizer injector is connected with a tank body; the lowest part of the mixing tank is connected with a submicron bubble generating device through a two-way solenoid valve I; the pH sensor and the EC sensor are connected with an EC / pH controller; the DO sensor is connected with a DO controller; the EC / pH controller and the DO controller are connected with a programmable controller; and each two-way solenoid valves, each three-way solenoid valve, the float ball water level gauge, the water supply pump, the pipeline pump and the submicron bubble generating device are respectively and electrically connected with the programmable controller. The trickle irrigation system and the trickle irrigation method can be widely used in various water, fertilizer and gas integrated trickle irrigation processes.

Description

technical field [0001] The invention relates to a drip irrigation system and a drip irrigation method, in particular to a water, fertilizer and gas integrated drip irrigation system and a drip irrigation method suitable for root zone irrigation of greenhouse crops. Background technique [0002] Water, fertilizer, air, heat, and light are the five external factors of plant growth and development, and all factors are interconnected to control plant growth and development. Among them, soil moisture and fertilizer, as the necessary conditions for plant growth, play an obvious role in regulating the growth characteristics of plants, and fertigation is one of the main sources of soil moisture and fertilizer. Reasonable irrigation can regulate the growth and development of crop roots, so that the stems, roots, and leaves can maintain the optimal growth, so as to achieve the best output ratio. Soil aeration had a significant impact on root zone respiration and organic matter decomp...

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Problems solved by technology

But there are some problems: 1. Due to its simple structure, its structural stability in practical application needs to be verified; 2. The solubility of gas in water is low, and the storage time is short, which makes the ventilation time long and the frequency high; 3. The irrigation method is relatively simple Wait

[0005] Another example: in the prior art, there is also a field air injector to add oxygen in the air to the irrigation water flow, and then transport the oxygen to the crop root zone through the ground irrigation system, although the air injector adds oxygen to the crop root zone. The potential for growth, but there are also the following shortcomings: 1. The air injector operates according to the Venturi principle, that is, the pressure of the inlet and outlet of the injector is controlled by the valve to form a pressure difference on both sides, thereby controlling the amount of air entering the irrigation water; but the air injector Installed behind the water pump, when the water flow rate is unstable, it will inevitably cause changes in the pressure on both sides of the syringe, and the accuracy of adjusting the pressure through the valve is also relatively low. Unstable pressure is difficult to ensure the stability of the air concentration in the irrigation water; secondly, the pressure The gas in the pipeline will also cause the instability of the system operation

2. Since the air injector directly adds air to the irrigation water, the solubility of air in the water is small, and the air is easy to escape from the irrigation point during ground irrigation, so it is only suitable for underground drip irrigation; at the same time, the hydraulic loss of the injector is large. A certain working pressure difference needs to be maintained on both sides of the outlet, and the pressure loss is relatively large, which in turn results in high energy consumption, which greatly limits the application of oxygen irrigation in actual production

[0006] In addition, the drip irrigation emitter used in the prior art is very prone to clogging, once it is clogged, it cannot be used, and it is necessary to stop the system operation for cleaning, which is time-consuming and laborious

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