CN-122004113-A - Drip irrigation system for towel gourd cultivation

CN122004113ACN 122004113 ACN122004113 ACN 122004113ACN-122004113-A

Abstract

The invention relates to the technical field of drip irrigation control, and discloses a drip irrigation system for towel gourd cultivation, which comprises an atmospheric demand simulation unit, a soil humidity sensing unit, a drip irrigation execution unit and a main controller, wherein the main controller is used for generating feedforward demand signals by the atmospheric demand simulation unit With dynamically updated crop coefficients As the main irrigation basis, the feedback correction signal VWC generated by the soil humidity sensing unit is used for safety correction, and the main controller also uses the historical irrigation quantity and the net change quantity of soil humidity Time integrated value of VWC and feedforward demand signal, and crop coefficient is continuously updated through water balance calculation 。

Inventors

QIAN XIAOJIE
ZHANG SHICHANG
CHEN WENSHENG
XIAO QINGTIE
ZHENG XIANGZHENG
LIU YUQIAN

Assignees

福建农业职业技术学院

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (10)

1. A drip irrigation system for towel gourd cultivation, said system comprising: the system comprises an atmospheric demand simulation unit, a soil humidity sensing unit, a drip irrigation execution unit and a main controller; the atmospheric demand simulation unit is configured to generate a feed-forward demand signal indicative of an atmospheric transpiration driving force ; The soil moisture sensor unit is configured to generate a feedback correction signal indicative of the soil moisture of the root zone ; The main controller is configured to perform the steps of step a, based on the feedforward demand signal With a currently stored crop coefficient Multiplying to generate a basic irrigation command, and correcting the signal according to feedback Step c, at the end of a preset calibration period, based on the total irrigation volume applied by the drip irrigation execution unit during the period And measuring the net change in soil moisture between the start and stop points of the cycle by the soil moisture sensor unit Calculating an actual evapotranspiration Step d, in the same calibration period, by feeding forward the demand signal Time integration is carried out to calculate a total potential evaporation amount Step e, calculating the actual evapotranspiration And total potential evaporation Calculating and updating the ratio between the crop coefficients used in step a 。
2. The drip irrigation system for cultivation of towel gourd according to claim 1, wherein the atmospheric demand simulation unit comprises a standardized evaporator configured to be exposed to the canopy microclimate of the towel gourd, a micro-reservoir for supplying water to the standardized evaporator, and a measuring assembly configured to measure a loss rate of moisture in the micro-reservoir to generate the feedforward demand signal The measuring component is a weighing sensor or a liquid level sensor.
3. The drip irrigation system for cultivation of towel gourd according to claim 1, wherein the main controller, when executing step b, overrules or revises the towel gourd by feeding back a revise signal Overwetting the soil by a predetermined threshold value, overoverwetting the soil by a predetermined threshold value, overwetting or reducing the execution of the basic irrigation command, and feeding back a correction signal And triggering a supplementary irrigation command outside the basic irrigation command when the soil humidity is indicated to be lower than a preset drought threshold.
4. The drip irrigation system for towel gourd cultivation according to claim 1, wherein the main controller is further configured to, prior to performing step a, modify the signal based on feedback Calculating and determining a smoothing time constant, using a time domain smoothing filter with the smoothing time constant as a parameter, for the feedforward demand signal Processing to generate a smoothed feedforward demand signal, and the main controller uses the smoothed feedforward demand signal in step a in place of the feedforward demand signal To generate a base irrigation command, wherein the master controller is configured to increase the smoothing time constant when the soil moisture is above a preset smoothing adjustment threshold and decrease the smoothing time constant when the soil moisture is below the preset smoothing adjustment threshold.
5. The drip irrigation system for towel gourd cultivation according to claim 3, wherein the main controller is further configured to monitor the feedback correction signal in step b Event frequency triggering a preset drought threshold and resulting in supplemental irrigation instructions Frequency of event Satisfy the following requirements Determining a feed-forward demand signal when the condition is satisfied Is unreliable in that Degrading the control logic of the drip irrigation system to rely solely on the feedback correction signal in response to the determination And generates an alarm indicating that the atmospheric demand simulation unit requires maintenance.
6. The drip irrigation system for towel gourd cultivation according to claim 1, wherein the main controller is configured to read the total irrigation amount during a preset calibration period when performing step c Reading the net change of soil humidity at the beginning and the end of the preset calibration period Based on the water balance principle, by Calculating the actual evapotranspiration 。
7. The drip irrigation system for towel gourd cultivation according to claim 1, wherein the drip irrigation execution unit comprises a plurality of drip irrigation hardware units physically divided into at least two hydraulic isolation areas, each hydraulic isolation area comprising at least one independently controllable valve, the master controller is further configured to trigger a hydraulic isolation control strategy for the first hydraulic isolation area at a logical topology level of system control when the health status of the first hydraulic isolation area is assessed as a risk status, the hydraulic isolation control strategy comprising modifying an irrigation schedule of a second hydraulic isolation area physically adjacent to the first hydraulic isolation area such that irrigation execution times of the first hydraulic isolation area and the second hydraulic isolation area are forcibly separated on a time axis.
8. The drip irrigation system for cultivation of towel gourd according to claim 7, further comprising at least one root zone environmental sensor disposed in the hydraulic isolation zone for collecting root zone environmental data of the hydraulic isolation zone, the root zone environmental data including at least soil volume water content Data and soil conductivity The step of the master controller assessing the health status includes based on Data and data Data, diagnosing whether the first hydraulic isolation zone is in a specific risk mode of high humidity and high salt or losing the water absorbing capacity of the root system.
9. The drip irrigation system for towel gourd cultivation according to claim 8, wherein the main controller is further built-in with a hydrodynamic digital twin model, wherein the main controller is further configured to monitor the dynamic response curve of the environmental data of the root zone after the irrigation event occurs, compare the dynamic response curve with the health response curve predicted by the hydrodynamic digital twin model, and evaluate the health status of the hydraulically isolated zone as a risk status when the deviation of the dynamic response curve from the health response curve exceeds a preset threshold.
10. The drip irrigation system for towel gourd cultivation according to claim 7, further comprising flow or pressure sensors for monitoring the total piping and the branch piping of each hydraulic isolation area, wherein the main controller is further configured to perform energy flow or mass flow conservation verification of the physical integrity of the system based on the readings of the flow or pressure sensors prior to performing irrigation.

Description

Drip irrigation system for towel gourd cultivation Technical Field The invention relates to a drip irrigation system for towel gourd cultivation, and belongs to the technical field of drip irrigation control. Background In the current facility agriculture production, a drip irrigation system is widely applied, an automatic control logic of the drip irrigation system generally depends on a soil moisture sensor to work, the mode is to monitor the volume moisture content of a soil matrix, and start water replenishment when the volume moisture content is lower than a preset irrigation threshold value, so that a root zone environment is maintained in a relatively stable water holding state, a main operation mode of the conventional irrigation automation is formed, however, the soil moisture is a hysteresis index which reflects a historical accumulation result of moisture consumption and is not an instant requirement of plant transpiration, the characteristic is that the limitation of the drip irrigation system is obvious when the drip irrigation system is applied to crops with large canopy leaf areas such as luffa and high transpiration rate, the real moisture requirement of the luffa canopy is determined by the atmospheric microclimate with rapid changes of illumination, temperature, humidity and the like, when the atmospheric transpiration requirement is rapidly increased in a short time, the root system water absorption rate can not meet the canopy requirement, and the soil moisture sensor cannot enter the instant water stress due to the existence of a soil moisture holding buffer zone, the soil moisture sensor has no reading to reach the irrigation threshold value, and the real moisture requirement of the crop cannot respond to the high-time and the real photosynthetic efficiency is damaged due to the long-time and long-term stress. In order to solve the hysteresis problem, attempts of different paths are made in the industry, but new constraints are faced to 1, a calculation model of the evapotranspiration amount based on multidimensional weather parameters is built, the paths depend on high-cost weather station hardware and calculation resources, the model is calibrated to be complex and high in maintenance cost, the model is difficult to widely apply in conventional agricultural production, 2, a high-frequency and timed pulse type irrigation flow is adopted, the method is easy to cause the root system to be in a supersaturated state for a long time to cause hypoxia, and the irrigation time and the real requirements of crops lack of the same are directly associated, meanwhile, some researches are conducted on improvement of the physical structure of drip irrigation equipment, and the engineering problems such as drip irrigation equipment blocking are attempted to be solved, for example, chinese patent with an authorized announcement number of CN221128293U discloses drip irrigation equipment for cultivation, the technical key point of the scheme is to solve the problem that soil is easy to enter into a water outlet to cause blocking after the drip irrigation pipe is contacted with the ground for a long time, the problem that the drip irrigation equipment is easy to enter into a water outlet, the drip irrigation system is mainly comprises an arc plate, a water outlet pipe and a water outlet pipe is blocked by physical displacement, the problem is prevented from being in a physical displacement mode, however, when the drip irrigation logic is not controlled by the drip irrigation system is more than the water inlet, and the problem is controlled by the water blocking logic, and the water blocking problem is not triggered by the water blocking logic when the water blocking logic is controlled on the soil blocking problem is more than the water blocking problem. Therefore, how to design a new control mode can avoid the dependence on the hysteresis index, namely soil humidity, and can avoid adopting a complex and high digital calculation model, and the invention aims to solve the technical problems of obtaining a leading index capable of reflecting the atmospheric transpiration driving force in real time in a simple structure, controllable cost and reliable operation mode, constructing irrigation control logic based on the leading index, and realizing synchronous response of irrigation and real water demand of crops. Disclosure of Invention The invention provides a drip irrigation system for towel gourd cultivation, which mainly aims to solve the problems that a leading index capable of reflecting the atmospheric transpiration driving force in real time is obtained in a simple structure, cost-controllable and reliable operation mode, and irrigation control logic is constructed based on the leading index, so that synchronous response of irrigation and real water demand of crops is realized. In order to achieve the above object, the present invention provides a drip irrigation system for towel gourd cultivation, t