Distributed joint monitoring system for farmland soil humidity and irrigation water quantity

Abstract

The invention discloses a distributed joint monitoring system for farmland soil humidity and irrigation water quantity, belonging to the technical field of farmland energy saving and water conservation. The system is characterized by a Zigbee protocol-based distributed computer monitoring system of a wireless humidity sensor and a wireless flowmeter based on a magnetic control valve; in a computer, a soil humidity sensor collects the soil humidity at each node of a center spoke type spray pipe net or drip net, the utilization factor of the canal water of the pipe net is monitored through two wireless flowmeters at a main pipe exit and a canal water entrance of the pipe net, a dual-power supply circuit composed of a solar panel and a standby battery supplies power to an electromagnetic coil of a control valve, and the computer calculates the maximum water content of the soil of unit volume by use of the soil humidity; and after multiplying the difference between the maximum water holding capacity of the field and the irrigation water quantity by an adjustment factor reflecting individual control, the increase and decrease control is performed until the maximum water holding capacity of the soil is equal to the total irrigation water quantity after the increase and decrease control. The system disclosed by the invention has the advantages of low energy consumption, low water consumption and synchronous monitoring of canal leakage.

Description

technical field [0001] The invention belongs to the technical field of water saving and energy saving during field or greenhouse operation, and in particular relates to the technical field of automatic farmland spray / drip irrigation based on a magnetic control valve. Background technique [0002] On the issue of farmland irrigation, energy saving does not necessarily save water, because there is waste in irrigation, but water saving must save energy. Eliminate the contradiction between energy saving and water saving. [0003] Traditional automatic irrigation systems based on soil control generally have the following defects: [0004] 1. There is a lack of a dual-circuit power supply circuit powered by solar power panels and batteries, which consumes more energy than solar power, and has low reliability. Faults cannot be detected and displayed, thus affecting the reliability of water inflow control. [0005] 2. The lack of a solar-powered water inlet control valve increases...

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Problems solved by technology

[0004] 1. There is a lack of a dual-circuit power supply circuit powered by solar power panels and batteries, which consumes more energy than solar power, has low reliability, and cannot detect and display faults, thus affecting the reliability of water inflow control.

[0005] 2. The lack of a solar-powered water inlet control valve increases the energy consumption of the system

[0006] 3. It is impossible to detect the leakage status of the channel at the same time in the field operation, the utilization coefficient of channel water is low, and the alarm display cannot be displayed

[0007] 4. In the control mode of soil moisture, the fixed value control mode with soil moisture as the control variable is generally adopted, which belongs to the intermittent control mode, and is actually an open-loop control system, which leads to frequent water supply and low control accuracy. Low water consumption and large water consumption, can not monitor the water utilization coefficient of the channel, and can not know the leakage of the channel

[0008] 5. It cannot be combined with the local field type (paddy field or dry field), soil type (clay or sandy soil), different growth periods of crops, meteorological conditions, historical planting experience and the nutritional status of the soil itself as individualized corrections at that time, so as to Better carry out personalized fine farming based on the current reality

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