WO2016174576A1 - Irrigation and fertilization system powered by solar energy - Google Patents

Irrigation and fertilization system powered by solar energy Download PDF

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Publication number
WO2016174576A1
WO2016174576A1 PCT/IB2016/052361 IB2016052361W WO2016174576A1 WO 2016174576 A1 WO2016174576 A1 WO 2016174576A1 IB 2016052361 W IB2016052361 W IB 2016052361W WO 2016174576 A1 WO2016174576 A1 WO 2016174576A1
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Prior art keywords
irrigation
fertilization
fertilizer
solar energy
managing
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PCT/IB2016/052361
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French (fr)
Inventor
Sergio STRAZZELLA
Original Assignee
Strazzella Sergio
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Publication of WO2016174576A1 publication Critical patent/WO2016174576A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • A01G25/16—Control of watering
    • A01G25/167—Control by humidity of the soil itself or of devices simulating soil or of the atmosphere; Soil humidity sensors
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C23/00—Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
    • A01C23/04—Distributing under pressure; Distributing mud; Adaptation of watering systems for fertilising-liquids
    • A01C23/042—Adding fertiliser to watering systems
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C23/00—Distributing devices specially adapted for liquid manure or other fertilising liquid, including ammonia, e.g. transport tanks or sprinkling wagons
    • A01C23/007—Metering or regulating systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/12—Technologies relating to agriculture, livestock or agroalimentary industries using renewable energies, e.g. solar water pumping

Definitions

  • the present invention relates to a system which allows the fertilization and irrigation of agricultural lands, which is supplied with photovoltaic solar energy, in particular of stand-alone type.
  • the system described is characterized in that it is predominantly intended for not electrified areas, thus allowing the cultivation in rural areas as well.
  • the solar fertilization and irrigation system integrates basically two complementary technologies:
  • Fertirrigation is an agronomic technique which allows to irrigate and distribute at the same time the fertilizer in solution needed for plants; the fertirrigation system can be adapted to any type of irrigation technique, some of which are described in the following:
  • drop-wise irrigation system (also called micro-irrigation) is realized by means of a series of hoses in plastic laid on the surface of the soil to be irrigated, the different lines are laid in parallel to each other; each hose represents an irrigation line, the same is provided with different drips, i.e. points where water (with possibly the addition of fertilizer) goes out to sprinkle the soil.
  • sub-irrigation system or under-soil irrigation where the dropping wing is laid directly under the root of the plants; the system represents one of the most developed irrigation forms, with an optimal efficiency, even if it requires particular measures to avoid that the dropping wings get obstructed due to the soil or to the same roots of the plants.
  • the systems provided with dropping wings can be provided with drips of professional systems which allow to compensate the pressure going out to allow the same quantity of water to go out both from the first drip in line and from the last one.
  • the fertirrigation system is supplied upwards by a pump which provides the low prevalence sufficient pressure (average between 0.3 to 5 bar maximum) to overcome the charge losses of the above described systems; the distance between the various lines, the distance between the drips of the same line and the irrigation time of each single line are defined in a specific plan according to:
  • the fertirrigation system is further integrated with apparatuses which allow to distribute the fertilizer in solution needed for the respective culture, further provided with a mixing system of the fertilizer inside the tank of water stored to carry out the irrigation.
  • a photovoltaic system is able to transform, without any energetic conversion and instantly solar energy in electric energy without using any fuel.
  • the stand alone photovoltaic system is essentially made up of a generator made up of various panels positioned on a suitable support structure, a conditioning and control system of power and for the users not connected to the public distribution network, also of an energy accumulator (accumulator batteries) and an inverter for the transformation of direct current electric energy in alternating current for supplying charges.
  • accumulator batteries energy accumulator batteries
  • the invention can be considered a development of other ones concerning single specific elements, as the Patent US7048204 B1 , which describes a similar logic module, which allows to irrigate (regardless of the fertilization and the evaluation of the irrigation techniques) with 24V charges solar energy supplying, in such application the system supplies directly the pump regardless of the climatic parameters, soil humidity, irrigation technique and any other value.
  • Patent US201 10087379 A1 relates instead to a control system of solar radiation with irrigation need, by correlating them, also in this case there is no mention to the type of culture, real humidity of soil, and fertilizer needed.
  • Patent GB2493970 Another solution of lands fertilization and irrigation is the Patent GB2493970 which describes a fertirrigation technique based on statistical and not detected parameters and on a variable proportion of fluid flows for the fertilization of different areas, such Patent provides the use of solar energy and sensors, but it does not correlate the use thereof, in addition the fertilizer is stored in liquid form thus allowing a mixing by means of a regulation of proportional flow. Description of the solar irrigation and fertilization system
  • the proposed system (100) is made up of a container (101 ) realized with structural and supporting elements realized in zinc-coated and varnished steel; to such elements insulated panels in polyurethane, coated with zinc-coated and varnished foil will be coupled for closing the walls and the roof, the system will be completed with a door in aluminum and transparent glass to allow the entrance in the room.
  • the elements of the mixing system made up of steel drawers (6) for housing fertilizers in powder or granules, the motor (7) connected to the Archimedean screw (5) for metering the fertilizer inside the container for the solution (8).
  • a distribution system made up of an electro-pump (9) for the distribution of the solution, the same will be connected to a manifold subdivided in lines, each one of which being provided with an electrically controlled solenoid valve (4).
  • the system (100) is electrically supplied by means of a solar energy system made up of photovoltaic panels (102) which will be laid on the roof of the container (101 ) and bolted to a system realized with metal structures, an electric board (2) containing the charge regulators, all the switches and protection, disconnecting and control systems, an accumulation system by means of batteries (1 ), an inverter (3) for conversion of direct current in alternating current.
  • a solar energy system made up of photovoltaic panels (102) which will be laid on the roof of the container (101 ) and bolted to a system realized with metal structures, an electric board (2) containing the charge regulators, all the switches and protection, disconnecting and control systems, an accumulation system by means of batteries (1 ), an inverter (3) for conversion of direct current in alternating current.
  • control and automation PLC able to record the parameters of inlet data and to control the metering and mixing system and distribution system of water by opening the solenoid valves (4) one by one to which the various lines will be connected.
  • the proposed system will be developed in different sizes, intended to cover different dimensions of agricultural system:
  • photovoltaic generation system between 500 Wp (2 panels) and 3000 Wp (12 panels) subdivided in different sizes (2, 3, 6, 9, or 12 panels)
  • inverter system of different sizes between 500 W and 3000 W for conversion of electric energy for supplying 230V charges in AC (pumps, stirrers, valves and sensors)
  • FIGS. 1 , 2 and 3 show perspective, front and top views of the 500 W model of the proposed solar fertilization and irrigation system.
  • Figure 4 represents as a way of example the inner plant of the 500 W model of the proposed system, which is provided with the following elements:
  • Such integration will be carried out by means of a multifunction modular CPU, i.e. a micro PLC (Programmable Logic Control) provided with web server and connection module by means of various currently existing systems (Internet, GSM/GPRS, wireless short or wide range) or available in the future.
  • a micro PLC Programmable Logic Control
  • the logic module described in the following will detect some physical quantities in the field and according to some locally preselected parameters or by means of the web server will actuate the charge system of the accumulators and fertirrigator.
  • Adxx water available of the area xx detected by the field sensor expressed in mm of water/metres of soil
  • Ac/cox optimal water available of culture xx expressed in mm of water/metres of soil (where xx indicates the specific culture planted in the respective area).
  • the available water of culture is calculated on the basis of table values and corrected according to two coefficients relative to the type of soil and radiation available, by means of the following formula:
  • Ac/cx water available of culture xx for the respective growing phase deriving from table statistical values expressed in mm of water/metres of soil
  • Kso/e non-dimensional corrective factor equal to the ratio between average radiation detected in the last two hours expressed in W/m 2 and the estimated value in 1000 W/m 2
  • Ksuoio non-dimensional table corrective factor dependent on the type of soil. Description of the logic module
  • the system (100) subdivides the area to be fertirrigated in a predetermined number of areas (103) for example 5 (see figure 6), each one of these areas (103) is provided with a humidity sensor of the soil which detects the quantity of water present; each area is also connected to the fertirrigation system in the container by a tele-controlled automatic valve which allows, if opened, to irrigate that area.
  • the system detects other environmental parameters such as temperature and solar radiation, in addition to the charge status of accumulators.
  • the system individuates, as previously described, the soil area where the humidity value of soil Upcx is minimum among all the areas cultivated in that time, and carries out the irrigation cycle in that area.
  • the quantity of fertilizer it is calculated in terms of kg of product for Ha of culture for season, and in the following it is distributed with an average value for single sprinkling cycle for a number of predetermined number of cycles.
  • the system carries out the irrigations without mixing the fertilizer.
  • the fertirrigation step consists in the addition in the tank of the water needed first, in the following the estimated fertilizer (in liquid, powder or granule form), in the following the system actuates the stirrer for a predetermined time interval to allow the distribution of fertilizer in the water.

Abstract

Object of the present invention is a system which allows the fertilization and irrigation of agricultural lands, supplied with photovoltaic solar energy, in particular of the stand alone type, particularly adapted for use in predominantly not electrified areas, thus allowing the cultivation in rural areas as well.

Description

IRRIGATION AND FERTILIZATION SYSTEM POWERED BY SOLAR
ENERGY
The present invention relates to a system which allows the fertilization and irrigation of agricultural lands, which is supplied with photovoltaic solar energy, in particular of stand-alone type.
The system described is characterized in that it is predominantly intended for not electrified areas, thus allowing the cultivation in rural areas as well.
Today and increasingly in the future, the problem of the cultivation of ever more extended areas is a strategic aspect which will become ever more important. In fact some studies indicate that in the next decades the world population will increase up to reach 9 billion people and the pro capite average consumption of food supplies will grow as well.
The same importance will be given to the field of energy where the amount of exhaustible fossil fuels will grow in absolute terms of year consumption, but will be reduced in terms of percentages at the expense of the renewable energy sources.
The increase in demand will generate an increase of prices in the middle and long period, thus opening to new solutions for the correct management of the above mentioned primary resources.
The solar fertilization and irrigation system integrates basically two complementary technologies:
• fertilization and irrigation of lands
• the stand alone photovoltaic system for electric supply Such both systems will be interfaced to each other by means of a unique data detection system and unit control which will allow the systems to interact according to the variables detected.
In the following it is described the state of the art in three elements, the functions of the fertirrigation system, the stand alone photovoltaic system and the industrial inventions of irrigation and fertilization systems supplied with solar energy.
Fertirrigation
Fertirrigation is an agronomic technique which allows to irrigate and distribute at the same time the fertilizer in solution needed for plants; the fertirrigation system can be adapted to any type of irrigation technique, some of which are described in the following:
• method of irrigation by submersion, where the soil is provided with more or less regular water layers with different thicknesses for more or less long periods. This method is applied in plain for determined cultures (for example rice) and for determined soil types (little permeable), the system requires very much water and currently it is little used.
• method of sliding irrigation which provides a water flow during the irrigation period, which infiltrates in the soil, such system can be conceived in different modes, and it is expensive in terms of water resources and little used as well.
• method of irrigation by aspersion which simulates a rain system with different kinds of irrigators with different measures and flow rates with different ranges and irrigation forms, it reduces the irrigation losses with respect to the preceding systems thanks to the absence of losses due to deep sliding and percolation, in addition it does not require particular arrangements in the soil.
• drop-wise irrigation system (also called micro-irrigation) is realized by means of a series of hoses in plastic laid on the surface of the soil to be irrigated, the different lines are laid in parallel to each other; each hose represents an irrigation line, the same is provided with different drips, i.e. points where water (with possibly the addition of fertilizer) goes out to sprinkle the soil.
• sub-irrigation system or under-soil irrigation, where the dropping wing is laid directly under the root of the plants; the system represents one of the most developed irrigation forms, with an optimal efficiency, even if it requires particular measures to avoid that the dropping wings get obstructed due to the soil or to the same roots of the plants.
Generally, the systems provided with dropping wings can be provided with drips of professional systems which allow to compensate the pressure going out to allow the same quantity of water to go out both from the first drip in line and from the last one.
For clear reasons the proposed system will be adapted in particular to the last three types of irrigation.
The fertirrigation system is supplied upwards by a pump which provides the low prevalence sufficient pressure (average between 0.3 to 5 bar maximum) to overcome the charge losses of the above described systems; the distance between the various lines, the distance between the drips of the same line and the irrigation time of each single line are defined in a specific plan according to:
• the type of soil • the type of culture
• the developing step of the respective culture
The fertirrigation system is further integrated with apparatuses which allow to distribute the fertilizer in solution needed for the respective culture, further provided with a mixing system of the fertilizer inside the tank of water stored to carry out the irrigation.
Stand alone photovoltaic solar system
A photovoltaic system is able to transform, without any energetic conversion and instantly solar energy in electric energy without using any fuel.
It exploits the so called photovoltaic effect, i.e. the capacity of some semiconductor materials, suitably treated, to generate electricity if exposed to light radiation. The stand alone photovoltaic system is essentially made up of a generator made up of various panels positioned on a suitable support structure, a conditioning and control system of power and for the users not connected to the public distribution network, also of an energy accumulator (accumulator batteries) and an inverter for the transformation of direct current electric energy in alternating current for supplying charges. Description of the state of the art of industrial inventions of the field
In literature there exist many applications for which there have been obtained patents, or which are following the iter in this field, but all the solutions do not integrate the whole system in an harmonious solution which detects a plurality of land data (temperature, soil humidity, charge status of the batteries system, growth phase and culture type), as it will be explained in the following, and controls actuators and solenoid valves to obtain the optimal fertirrigation according to the previously detected parameters; the innovation consists in integrating and making organic the system elements, decoupled so far.
The invention can be considered a development of other ones concerning single specific elements, as the Patent US7048204 B1 , which describes a similar logic module, which allows to irrigate (regardless of the fertilization and the evaluation of the irrigation techniques) with 24V charges solar energy supplying, in such application the system supplies directly the pump regardless of the climatic parameters, soil humidity, irrigation technique and any other value.
The more recently issued Patent US201 10087379 A1 relates instead to a control system of solar radiation with irrigation need, by correlating them, also in this case there is no mention to the type of culture, real humidity of soil, and fertilizer needed.
Other systems as the application CN103477950 A transform the thermal energy developed by means of solar rays in mechanic energy for irrigation or as the Patent US7809475 B2 which develops a controller to carry out the fertirrigation of cultures.
Another solution of lands fertilization and irrigation is the Patent GB2493970 which describes a fertirrigation technique based on statistical and not detected parameters and on a variable proportion of fluid flows for the fertilization of different areas, such Patent provides the use of solar energy and sensors, but it does not correlate the use thereof, in addition the fertilizer is stored in liquid form thus allowing a mixing by means of a regulation of proportional flow. Description of the solar irrigation and fertilization system
The proposed system (100) is made up of a container (101 ) realized with structural and supporting elements realized in zinc-coated and varnished steel; to such elements insulated panels in polyurethane, coated with zinc-coated and varnished foil will be coupled for closing the walls and the roof, the system will be completed with a door in aluminum and transparent glass to allow the entrance in the room.
Inside the container there will be housed the elements of the mixing system made up of steel drawers (6) for housing fertilizers in powder or granules, the motor (7) connected to the Archimedean screw (5) for metering the fertilizer inside the container for the solution (8).
Moreover, inside the container it will be installed a distribution system made up of an electro-pump (9) for the distribution of the solution, the same will be connected to a manifold subdivided in lines, each one of which being provided with an electrically controlled solenoid valve (4).
The system (100) is electrically supplied by means of a solar energy system made up of photovoltaic panels (102) which will be laid on the roof of the container (101 ) and bolted to a system realized with metal structures, an electric board (2) containing the charge regulators, all the switches and protection, disconnecting and control systems, an accumulation system by means of batteries (1 ), an inverter (3) for conversion of direct current in alternating current.
In addition inside the board (2) it will be arranged the control and automation PLC, able to record the parameters of inlet data and to control the metering and mixing system and distribution system of water by opening the solenoid valves (4) one by one to which the various lines will be connected. The proposed system will be developed in different sizes, intended to cover different dimensions of agricultural system:
• photovoltaic generation system between 500 Wp (2 panels) and 3000 Wp (12 panels) subdivided in different sizes (2, 3, 6, 9, or 12 panels) · inverter system (of different sizes between 500 W and 3000 W) for conversion of electric energy for supplying 230V charges in AC (pumps, stirrers, valves and sensors)
• battery accumulation systems between 1000 and 8000 VA
• the respective irrigation and fertilization system will be modular as well.
As a way of example of the different sizes see figures 1 , 2 and 3 which show perspective, front and top views of the 500 W model of the proposed solar fertilization and irrigation system.
Figure 4 represents as a way of example the inner plant of the 500 W model of the proposed system, which is provided with the following elements:
1. accumulation battery system for electric energy
2. electric board system
3. inverter system for energy conversion
4. hydraulic system made up of pipes, manifolds, solenoid valves to which the outer irrigation lines are to be connected
5. metering Archimedean screw for fertilizer in powder
6. container for fertilizer in powder
7. metering device electric motor
8. container for fertilizer solution
9. electro-pump for irrigation In figure 5 it is possible to see the perspective of the metering system with Archimedean screw (5), motor (7) and accumulation system (8) of the irrigation solution.
Description of automation interface of new systems and elements of the system
As yet said the innovation of this system is the optimized integration and management of the two above separately described systems.
Such integration will be carried out by means of a multifunction modular CPU, i.e. a micro PLC (Programmable Logic Control) provided with web server and connection module by means of various currently existing systems (Internet, GSM/GPRS, wireless short or wide range) or available in the future.
The logic module described in the following will detect some physical quantities in the field and according to some locally preselected parameters or by means of the web server will actuate the charge system of the accumulators and fertirrigator.
To define some functions of the logic module it is needed to define some parameters according to environmental and cultures data, in particular:
U cx = Ac/xx/Acfcox
where:
Upcx = humidity percentage for area
Adxx = water available of the area xx detected by the field sensor expressed in mm of water/metres of soil Ac/cox = optimal water available of culture xx expressed in mm of water/metres of soil (where xx indicates the specific culture planted in the respective area).
The available water of culture is calculated on the basis of table values and corrected according to two coefficients relative to the type of soil and radiation available, by means of the following formula:
Ac/cox = Ac/cx ' Kso/e ' Ksi/o/o
where
Ac/cx = water available of culture xx for the respective growing phase deriving from table statistical values expressed in mm of water/metres of soil
Kso/e = non-dimensional corrective factor equal to the ratio between average radiation detected in the last two hours expressed in W/m2 and the estimated value in 1000 W/m2
Ksuoio = non-dimensional table corrective factor dependent on the type of soil. Description of the logic module
The system (100) subdivides the area to be fertirrigated in a predetermined number of areas (103) for example 5 (see figure 6), each one of these areas (103) is provided with a humidity sensor of the soil which detects the quantity of water present; each area is also connected to the fertirrigation system in the container by a tele-controlled automatic valve which allows, if opened, to irrigate that area.
In addition to such parameters the system detects other environmental parameters such as temperature and solar radiation, in addition to the charge status of accumulators.
Once the maximum charge of the accumulators is detected the system, according to the detected environmental parameters (humidity, temperature and solar radiation) individuates, as previously described, the soil area where the humidity value of soil Upcx is minimum among all the areas cultivated in that time, and carries out the irrigation cycle in that area.
Referring instead to the quantity of fertilizer it is calculated in terms of kg of product for Ha of culture for season, and in the following it is distributed with an average value for single sprinkling cycle for a number of predetermined number of cycles.
Once reached the predetermined number of cycles where to distribute the fertilizer for each single area for a predetermined time interval (week or month) the system carries out the irrigations without mixing the fertilizer.
The fertirrigation step consists in the addition in the tank of the water needed first, in the following the estimated fertilizer (in liquid, powder or granule form), in the following the system actuates the stirrer for a predetermined time interval to allow the distribution of fertilizer in the water.
When this step is ended the system starts the distribution pump of the water by opening the valve of the respective area and by keeping the other valves closed.
At the end the system turns back in stand by allowing the photovoltaic panels to recharge the batteries.
Once the completed recharge of the accumulators is reached the system restarts the previously described cycle.

Claims

1. Method for managing a device (100) of fertilization and irrigation supplied with solar energy configured to allow the fertilization and irrigation of grasses, gardens and the like, without the need to be connected to the electric network, said device (100) of fertilization comprising a prefabricated container (101 ) realized in metal elements and insulated panels, at least a tank (8) for water storage, at least an electro-pump (9) for irrigation, a plurality of solenoid valves (4) for controlling the irrigation areas (103), at least an electric board (2) for controlling a plurality of field sensors and controlling the irrigation system, a plurality of sensors for measuring the relative humidity of the soil, a fertilizer metering system (6), a plurality of electric energy accumulation batteries (1 ), a plurality of photovoltaic panels (102) for recharging batteries (1 ), at least a controller with programmable logic for interaction of said elements of device (100), said method being characterized by the following steps:
a) testing that the charge status of the batteries (1 ) allows the correct completing of the irrigation cycle
b) testing that the area section (103) to be irrigated has the minimum value of relative humidity among all the monitored sections c) testing that the area section (103) to be irrigated has a value of relative humidity lower than a predetermined threshold, different for type of culture and growing phase
d) filling the tank (8) of water storage of the system e) introducing the fertilizer in powder or liquid form, in the predetermined quantity by the system, inside the water tank (8) to obtain the irrigation solution
f) starting and completing the irrigation cycle of the system.
2. Method for managing a device (100) of fertilization and irrigation supplied with solar energy according to claim 1 , characterized in that said introducing step of fertilizer inside the water tank (8) is actuated by means of an Archimedean screw electromechanical system (5), in case of fertilizer in powder.
3. Method for managing a device (100) of fertilization and irrigation supplied with solar energy according to claim 1 , characterized in that said introducing step of fertilizer inside the water tank (8) is actuated by means of a system comprising a Venturi tube or metering pomp, in case of liquid fertilizer.
4. Method for managing a device (100) of fertilization and irrigation supplied with solar energy according to claim 1 , characterized in that said fertilization and irrigation device comprises also an electronic board connected to the Internet for consulting and upgrading the irrigation parameters of the system by inquiring a remote database.
PCT/IB2016/052361 2015-04-27 2016-04-26 Irrigation and fertilization system powered by solar energy WO2016174576A1 (en)

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ITUB2015A000618A ITUB20150618A1 (en) 2015-04-27 2015-04-27 Solar Fertigator
ITUB2015A000618 2015-04-27

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CN108419578A (en) * 2018-05-04 2018-08-21 肇庆学院 A kind of photovoltaic agricultural greenhouse trickle irrigation spray fertilizer apparatus of tunable optical
CN108450117A (en) * 2018-05-25 2018-08-28 山东农业大学 High bar liquid manure all-in-one machine based on wireless telecommunications
CN109168752A (en) * 2018-10-22 2019-01-11 北京师范大学珠海分校 A kind of intelligent irrigation flowerpot and its control method based on photovoltaic power generation
CN109348819A (en) * 2018-11-14 2019-02-19 山东省农业机械科学研究院 A kind of intelligent and high-efficiency water-fertilizer-pesticide integral system
CN112237082A (en) * 2020-10-19 2021-01-19 柴亚强 Agricultural is with fertigation irrigation system
CN113728779A (en) * 2021-08-11 2021-12-03 刘明启 Low-pressure high-frequency secondary agricultural water-saving irrigation system and method
US11205896B2 (en) 2018-11-21 2021-12-21 Black & Decker Inc. Solar power system
CN116195421A (en) * 2023-02-25 2023-06-02 郭英 A fertigation integration equipment for farming

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CN108419578A (en) * 2018-05-04 2018-08-21 肇庆学院 A kind of photovoltaic agricultural greenhouse trickle irrigation spray fertilizer apparatus of tunable optical
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CN112237082A (en) * 2020-10-19 2021-01-19 柴亚强 Agricultural is with fertigation irrigation system
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