Soilless culture nutrient solution containing solid hydrogen supply material and irrigation method and system

Abstract

The invention discloses a soilless culture nutrient solution containing a solid hydrogen supply material and an irrigation method and system. Raw materials of the soilless culture nutrient solution comprise the solid hydrogen supply material, a nutrient solution and a pH regulator. The use amount of the solid hydrogen supply material is 0.05-5 mmol / L; the dosage of the pH regulator is 0.01 to 50 mmol; all the raw materials are mixed, and the soilless culture nutrient solution with the irrigation hydrogen concentration larger than or equal to 500 ppb / L and the pH value of 5-8 is provided. On the basis of applying the soilless culture nutrient solution, the pH value and the hydrogen concentration of the soilless culture nutrient solution are monitored in real time, and the pH value and the hydrogen concentration of the soilless culture nutrient solution are adjusted and controlled by adjusting and controlling at least one of the applying amount of the soilless culture nutrient solution, the applying speed of the soilless culture nutrient solution, the using amount of a solid hydrogen supply material and the using amount of a pH adjusting agent. The hydrogen-rich nutrient solution can be controllably provided for soilless culture plants, stable release of hydrogen and proper adjustment of the pH value and nutritional ingredients are achieved, and the requirements of different crops and different growth stages are met.

Description

Technical Field

[0001] The invention relates to the technical field of development and utilization of plant growth regulating substances, and in particular to a soilless culture nutrient solution containing solid hydrogen supplying materials, an irrigation method and an irrigation system. Background Art

[0002] Soilless cultivation is a modern agricultural innovation that subverts traditional farming methods. It does not use natural soil but uses substrate as the medium for plant growth, and uses nutrient solution for irrigation after planting. This technology not only effectively reduces the risk of soil-borne pests and diseases, but also significantly saves precious land resources, and has shown excellent results in water resource utilization and fertilizer and pesticide reduction. It is widely used in the cultivation of vegetables, flowers, fruits and Chinese medicinal materials, and has become an ideal choice for agricultural production in extreme environments such as deserts, islands and space.

[0003] Invention CN102657221B discloses a hydrogen-rich liquid plant growth regulator, a preparation method and an application thereof. The hydrogen-rich liquid plant growth regulator has a hydrogen saturation of 0.1 to 100% in the solvent, and the solvent is water or a 25 to 100% strength Hoagland nutrient solution or Kimura B nutrient solution or TAP nutrient solution or MS culture solution. Calcium salt or salicylic acid or salicylate or salicylic acid derivative or humic acid or humate with an effective concentration of 0 to 1000 μmol / L is also added to the solvent. The practical application of this liquid hydrogen-rich water in the preparation of nutrient solution faces many challenges, such as the difficulty in stably controlling the hydrogen solubility, the easy dissipation of hydrogen, the high energy consumption of the preparation process, and the technical bottleneck of large-scale application.

[0004] Solid-state hydrogen storage materials are new hydrogen supply materials developed in recent years. They can achieve sustained release of hydrogen through hydrolysis reactions and can adjust the hydrogen supply concentration according to crop growth needs and reaction conditions. They have the advantages of high hydrogen supply density, controllable concentration and long-term sustained release. They have great potential for hydrogen supply in soilless cultivation nutrient solution.

[0005] Invention CN106699330A discloses a preparation method and application of a slow-release hydrogen fertilizer or a composite hydrogen fertilizer. The novel fertilizer contains hydrogen-producing materials or hydrogen storage materials and other additives, and also includes inorganic coating materials or organic polymer coating materials. The method is prepared by adding or not adding clay, fertilizers, pesticides and other substances to one or more hydrogen-producing materials or hydrogen storage materials in a certain proportion, using a granulator to form compressed particles of a certain size, and then using inorganic or organic polymer waterproof materials for coating. However, since the solution of the solid hydrogen storage material is alkaline after hydrolysis, the pH adjustment of the plant growth regulator cannot be achieved. In addition, it is difficult to accurately monitor and regulate the hydrogen release conditions of the composite fertilizer by only using a composite fertilizer with a certain slow-release structure design, and it is impossible to meet the nutritional needs of different types of plants and plants at different stages.

[0006] Therefore, how to control the pH of the nutrient solution while maintaining a stable hydrogen supply to make it suitable for plant absorption, while ensuring the stability of the hydrogen concentration and reducing energy consumption during preparation and use, so as to meet the needs of the soilless cultivation system for hydrogen-rich nutrient solution, is an urgent problem to be solved by technicians in this field. Summary of the invention

[0007] In view of the defects existing in the above-mentioned prior art, the present invention provides a soilless cultivation nutrient solution and an irrigation method and system containing solid hydrogen supply materials. The soilless cultivation nutrient solution has an appropriate pH value, a stable continuous hydrogen supply concentration, and is convenient to prepare and use. In addition, through the coordinated design of the irrigation method and the irrigation system, the pH value and hydrogen concentration of the soilless cultivation process can be adjusted in real time to meet the needs of different crops and different growth stages.

[0008] In a first aspect, the present invention provides a soilless culture nutrient solution containing a solid hydrogen supply material, wherein the raw materials of the soilless culture nutrient solution include a solid hydrogen supply material, a nutrient solution and a pH regulator;

[0009] The dosage of solid hydrogen supply material is 0.05-5mmol / L;

[0010] The dosage of pH regulator is 0.01-50mmol;

[0011] The raw materials are mixed to provide a soilless culture nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8.

[0012] In soilless culture systems, the hydrolysis of solid hydrogen supply materials may cause pH changes in the nutrient solution, especially when using CaH 2 or MgH 2 When metal hydrides are present, the solution will tend to be alkaline after the reaction, which is not conducive to the plant's absorption of nutrients.

[0013] The present invention can effectively neutralize alkaline byproducts by adding pH regulators (such as nitric acid, phosphoric acid, citric acid, etc.), adjust and stabilize the pH value of the nutrient solution, keep it in a suitable range of 5-8, and optimize the nutrient absorption environment of the plant root system.

[0014] In order to provide a nutrient solution with a stable hydrogen concentration and pH value to soilless cultivated plants, the present invention adds a solid hydrogen supply material and a pH adjuster to the nutrient solution, preferably mixes the raw materials in a closed mixing tank, and detects the hydrogen concentration and pH value of the nutrient solution in the mixing tank. When the test result is within a set range, it is poured into the soilless cultivated plants, thereby providing a soilless cultivation nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8 to the plant roots.

[0015] Preferably, the solid hydrogen supply material has a purity of 20-99%, including MgH 2、 Ammonia borane, KBH 4 Mg(BH 4 ) 2 , Ca(BH 4 ) 2 , CaH 2 , at least one of KH.

[0016] In the present invention, the above-mentioned solid hydrogen supply materials can be flexibly adjusted to meet the hydrogen needs of different plants during the cultivation process, and the above-mentioned materials can slowly release hydrogen to varying degrees during the hydrolysis or dissolution process. Ammonia borane and potassium borohydride have a faster hydrogen release rate and are suitable for situations where a higher rate of hydrogen supply is required, while metal hydrides (MgH 2 , CaH 2 The slow release effect of the solid hydrogen supply material is better, and it is suitable for soilless cultivation applications that require long-term stable hydrogen supply. In addition, the product after the reaction of the solid hydrogen supply material can further provide plants with other nutrients such as magnesium, calcium, nitrogen, and boron, which can adapt to a variety of soilless cultivation plants and supplement their growth needs at different stages.

[0017] Preferably, the pH regulator is selected from HNO 3 , H 2 SO 4 , HCl, H 3 PO 4 , carbonic acid, amino acids, acetic acid, citric acid, formic acid, carboxylic acid, salicylic acid and its derivatives, fulvic acid, humic acid and its derivatives One or more.

[0018] Some pH regulators (such as amino acids, citric acid, humic acid and its derivatives) are plant nutrients themselves or play a role in plant metabolism. For example, amino acids participate in the nitrogen metabolism of plants, citric acid promotes the absorption of metal ions, and humic acid substances can improve the growth environment of plant roots. The above-mentioned acid regulating solution can not only adjust the pH value, but also improve the comprehensive nutritional benefits of the nutrient solution, increase the stress resistance of plants, and promote growth. It is a multifunctional additive that increases the nutrient diversity of the soilless culture nutrient solution.

[0019] Preferably, the molar ratio of the solid hydrogen supply material to the pH regulator is 10:(1-100). The present invention provides hydrogen to the nutrient solution through the solid hydrogen supply material to form a hydrogen-rich nutrient solution, which has better plant growth and development promotion effect and environmental adaptability than ordinary plant nutrient solution. On this basis, according to the amount of solid hydrogen supply material and the ratio of its reaction with the pH regulator, the amount of pH regulator is adjusted to effectively control the pH value of the nutrient solution.

[0020] In a second aspect, the present invention further provides a method for irrigating the soilless culture nutrient solution, comprising the following steps:

[0021] S1. Mix the measured raw materials evenly to obtain a soilless culture nutrient solution;

[0022] S2, transporting and applying the soilless culture nutrient solution to the soilless culture plants;

[0023] The pH value and hydrogen concentration of the soilless culture nutrient solution are monitored, and at least one of the application amount of the soilless culture nutrient solution, the application rate of the soilless culture nutrient solution, the amount of solid hydrogen supply material, and the amount of pH adjuster is adjusted to provide the soilless culture plants with a soilless culture nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8.

[0024] Preferably, before step S1, the nutrient solution is prepared using soilless nutrient mother solution and water.

[0025] The nutrient solution of the present invention can be regulated according to the nutrient requirements of different stages during plant growth. First, one or more nutrient mother solutions are mixed with water to prepare a nutrient solution, the concentration of which is higher than the concentration of the nutrient solution actually used in the planting pot. Then, according to different plants or different growth stages, the nutrient solution and water are further proportioned and a nutrient solution that can be applied is obtained in a mixing tank. Although there is an additional pre-mixing step compared to the nutrient solution obtained by directly diluting the mother solution, it is more conducive to concentration regulation and adapting to the needs of various plants and different growth stages.

[0026] Preferably, the measured solid hydrogen supply material, pH regulator, water and nutrient solution are uniformly mixed in a closed mixing tank, and the proportion of the solid hydrogen supply material, pH regulator, water and nutrient solution in the mixing tank is adjusted according to the pH value and hydrogen concentration monitoring results of the soilless culture nutrient solution; and / or

[0027] The measured solid hydrogen supply material, pH regulator, water and nutrient solution are evenly mixed in multiple closed mixing tanks to prepare soilless culture nutrient solutions with different pH values ​​and hydrogen concentrations. The opening or closing of each mixing tank is regulated according to the monitoring results of the pH value and hydrogen concentration of the soilless culture nutrient solution.

[0028] During the hydrogen slow release process, the pH value will fluctuate as the hydrogen is gradually released. Therefore, based on the real-time detected pH changes in the planting pot, the present invention dynamically optimizes the pH environment by accurately adjusting the proportion of the components of the nutrient solution in the closed mixing tank to maintain the optimal acid-base balance of the nutrient solution, ensuring a stable hydrogen supply effect and the ideal conditions required for plant growth. Through this real-time feedback and regulation mechanism, the system can provide plants with a continuous and high-quality nutrient supply, greatly improving the stability of the soilless cultivation environment and the nutrient utilization efficiency.

[0029] In actual cultivation, the set hydrogen concentration and pH value corresponding to different plant varieties and growth stages are different, and as the ambient temperature, humidity, air pressure and other conditions change, the actual hydrogen concentration that the plants can obtain and the pH value of the nutrient solution will also be in dynamic change. After monitoring the hydrogen concentration and pH value and obtaining the corresponding feedback data, how to make timely and effective adjustments is also an important design direction of the present invention.

[0030] At present, the present invention adopts single tank regulation, multi-tank regulation or a combination of the two to perform rapid response and regulation. Single tank regulation is relatively simple and easy to control, but a single tank mainly corresponds to soilless culture plants under the same culture conditions. Multi-tank regulation provides multiple mixing tanks of different concentrations. For example, a standard nutrient solution is configured in a mixing tank, wherein the pH value is set to A, and the hydrogen concentration is set to ppb / L. The remaining mixing tanks can be set accordingly (A-1, 95% B), (A+1, 105% B), and the flow valves of each mixing tank are controlled separately according to the plant variety or real-time monitoring data. After being evenly mixed by a mixer before entering each planting pot, the nutrient solutions with the same or different hydrogen concentrations and the same or different pH values ​​are input into each group of planting pots, providing each planting pot with the optimal nutrient solution in real time and quickly, forming a more widely applicable irrigation method and system.

[0031] The combination of the two is to enable each single tank to flexibly control the solid-liquid ratio based on the multi-tank control method. These are all achievable through existing control modules and computer control programs based on the concept of the present invention.

[0032] Step S2 satisfies at least one of the following conditions:

[0033] 1) The soilless culture nutrient solution is applied to the plants through sprinkler irrigation, drip irrigation, pipe irrigation or a combination thereof;

[0034] 2) After the soilless culture nutrient solution is applied and irrigated to the soilless culture plants, a recovery solution is formed, and the recovery solution is refluxed to prepare a nutrient solution.

[0035] The soilless culture nutrient solution and irrigation method of the present invention are suitable for a variety of plants, such as at least one of lettuce, spinach, cabbage, water spinach, radish, coriander, rape, amaranth, leek, sprouts, tomato, strawberry, pumpkin, cucumber, chrysanthemum, mint, wolfberry, salvia miltiorrhiza, and sempervivum. Particularly advantageously, the nutrient solution, irrigation method and system of the present invention can be used to cultivate the above plants in different planting pots at the same time. Since the hydrogen concentration and pH value are monitored separately and the input nutrient solution ratio is independently controlled, the growth of the plants in each planting pot does not affect each other. For the application cycle conditions of the nutrient solution.

[0036] Depending on the plant and its growth stage, different nutrient solution application methods are used, including pipe irrigation, drip irrigation or sprinkler irrigation, among which:

[0037] In the pipe irrigation application method, soilless cultivation nutrient solutions with different hydrogen concentrations, pH values ​​and nutrient concentrations are prepared according to different growth stages of the plants, and are replaced at predetermined intervals according to the actual growth stages of the plants, and the intervals are preferably 1 to 7 days.

[0038] In the drip irrigation or sprinkler irrigation application method, the plants are sprayed or root-irrigated according to a certain application frequency. After spraying / drip irrigation, the pH value and hydrogen concentration of the soilless culture nutrient solution for the next spraying are controlled in real time according to the data fed back by the pH value and hydrogen concentration detectors in the mixing tank and the plant planting pot, so as to ensure that the pH value and hydrogen concentration in the plant planting pot are always kept within the set range. The application frequency is 1 to 20 times / day, and the application cycle is determined according to the growth cycle of the plant, which can be arbitrarily selected from 1 to 360 days. The drip irrigation / tube irrigation days / frequency are preferably selected according to the growth characteristics of the plant.

[0039] In a third aspect, the present invention further provides an irrigation system for the irrigation method, comprising a feeding unit, a mixing unit and a planting unit;

[0040] A feeding unit, comprising a liquid feeding device and a solid feeding device;

[0041] A mixing unit, comprising a plurality of closed mixing tanks, each of which is connected to the liquid supply device and the solid material supply device respectively;

[0042] The planting unit comprises a plurality of planting pots for planting plants and an irrigation pipeline connecting the planting pots with a mixing tank.

[0043] Preferably, the liquid supply device includes a water storage tank, at least one mother liquid tank and a liquid preparation tank, the water storage tank and the mother liquid tank are respectively connected to the liquid preparation tank for mixing and storing the premixed liquid, and the water storage tank and the liquid preparation tank are also respectively connected to the mixing tank for regulating the concentration of the nutrient solution. Preferably, a metering device is provided at the outlet of each tank.

[0044] Preferably, the planting unit further comprises a planting rack, and the plurality of planting pots are arranged on the planting rack; the planting rack is also provided with a water seepage trough, a water return trough and an irrigator, and each planting pot is respectively arranged in a single water seepage trough.

[0045] More preferably, the irrigation system further comprises a liquid return unit, which comprises a return trough, a return pipe and a return tank. The liquid out of the infiltration trough of the planting unit is discharged into the return trough and transported to the return liquid tank by the return pipe for storage and / or secondary utilization, thereby improving the utilization rate of the hydrogen-rich nutrient solution.

[0046] Preferably, the solid feeding device is a closed tank. Since the solid hydrogen supply material is relatively active and easily reacts with solvents such as water, oxygen in the air, acidic substances, etc., and becomes ineffective, the solid feeding device of the present invention preferably uses a water-proof and air-proof closed tank, which can be set separately or fixed on the outer wall of the mixing tank, thereby shortening the transportation distance and reducing the risk of loss and leakage.

[0047] Preferably, the irrigation system further comprises an acid tank for quantitatively providing pH regulator to each mixing tank. The acid tank can be provided separately or fixed to the outer wall of the mixing tank.

[0048] Preferably, the irrigation system further comprises a control unit, and metering devices respectively arranged on the liquid supply device, the solid supply device and the optional acid tank, a metering irrigation pump arranged at the outlet of the mixing tank, a pH sensor and a hydrogen concentration sensor arranged on the planting pot, and an optional temperature and humidity sensor;

[0049] The control unit is connected to the metering device, the metering irrigation pump, the pH sensor, the hydrogen concentration sensor and the optional temperature and humidity sensor signals.

[0050] The present invention has at least the following beneficial effects:

[0051] (1) The present invention achieves flexible regulation of the hydrogen concentration in the nutrient solution ≥ 500 ppb / L by adjusting the amount of solid hydrogen supply material and the ratio of the nutrient solution to meet the different hydrogen requirements of different crops. By using solid hydrogen supply materials to slowly release hydrogen during the hydrolysis process, long-term supply and stable release of hydrogen are achieved, ensuring that crops continue to obtain an appropriate amount of hydrogen during the growth period.

[0052] (2) The present invention controls the ratio of the solid hydrogen supply material and the pH regulator so that the pH value of the nutrient solution is stabilized within the range of 5-8. The nutrient solution has an appropriate pH value while providing hydrogen, thereby promoting better nutrient absorption by crops. At the same time, the reaction product of the pH regulator and the solid hydrogen supply material used in the present invention is also a plant nutrient component. While providing hydrogen and regulating the pH value of the nutrient solution, it can play a role in plant metabolism, thereby improving the comprehensive nutritional benefits of the nutrient solution.

[0053] (3) The irrigation method and irrigation system provided by the present invention can monitor the changes in hydrogen concentration and pH value in the planting pot in real time, and dynamically adjust the composition ratio of the nutrient solution in the closed mixing tank or regulate multiple mixing tanks of different concentrations according to the detection results to maintain the optimal nutrient balance of the irrigation nutrient solution. It not only ensures a stable hydrogen supply effect, but also optimizes the growth environment of the plant root system, so that the plant can continuously obtain suitable nutrients and hydrogen supply, thereby significantly improving the stability of soilless cultivation and plant growth efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a flow chart of the irrigation method of the present invention;

[0055] Figure 2 The pH value and hydrogen concentration test result diagram of Example 1;

[0056] Figure 3 The pH value and hydrogen concentration test result diagram of Example 2-2;

[0057] Figure 4 The real-time monitoring data of pH value and hydrogen concentration in Example 4 and Control Group 4 are shown. DETAILED DESCRIPTION

[0058] In order to better understand the above technical solution, the above technical solution will be described in detail below in combination with the specification and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0060] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0061] The soilless culture nutrient solution and the irrigation method and irrigation system provided by the present invention will be further explained in the specific implementation manner.

[0062] A soilless culture nutrient solution containing solid hydrogen supply material, the raw materials of which specifically include:

[0063] (1) Solid hydrogen supply material, with a dosage of 0.05-5 mmol / L; the solid hydrogen supply material has a purity of 20-99%, including magnesium powder, MgH 2、 Ammonia borane, KBH 4 Mg(BH 4 ) 2 , Ca(BH4 ) 2 , CaH 2 , at least one of KH.

[0064] (2) Nutrient solution: the nutrient solution is prepared by premixing water and soil-less nutrient solution. The soil-less nutrient solution can be provided by one or more conventional soil-less nutrient solution products.

[0065] (3) a pH adjuster, wherein the pH adjuster is selected from HNO 3 , H 2 SO 4 , HCl, H 3 PO 4 , carbonic acid, amino acids, acetic acid, citric acid, formic acid, carboxylic acid, salicylic acid and its derivatives, fulvic acid, humic acid and its derivatives; the amount of pH regulator in the soilless culture nutrient solution is 0.01-50mmol / L.

[0066] The solid hydrogen supply material and the pH regulator are added to the soilless culture nutrient solution at a molar ratio of 10:(1-100) and mixed to obtain a soilless culture nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8.

[0067] A method for irrigating the soilless culture nutrient solution specifically comprises the following steps:

[0068] S0, mix water and soilless nutrient mother solution to prepare nutrient solution;

[0069] S1. Add the measured raw materials into a closed mixing tank and mix them evenly to obtain a soilless culture nutrient solution;

[0070] S2. The soilless culture nutrient solution is transported and applied to the soilless culture plants. The application method includes sprinkler irrigation, drip irrigation, pipe irrigation or a combination thereof. The application cycle is 1 day to 360 days and the interval cycle is 0.5 hours to 7 days.

[0071] According to the monitoring results of pH value and hydrogen concentration of soilless culture nutrient solution, the proportion of solid hydrogen supply material, pH regulator, water and nutrient solution in the mixing tank is adjusted and / or the opening or closing of each mixing tank is adjusted respectively, so as to continuously provide soilless culture plants with irrigation hydrogen concentration ≥500ppb / L and soilless culture nutrient solution with pH value of 5-8. Specifically including:

[0072] (1) mixing the measured solid hydrogen supply material, pH regulator, water and nutrient solution in a closed mixing tank, and adjusting the proportion of the solid hydrogen supply material, pH regulator, water and nutrient solution in the mixing tank according to the pH value and hydrogen concentration monitoring results of the soilless culture nutrient solution; and / or

[0073] (2) Evenly mix the measured solid hydrogen supply material, pH regulator, water and nutrient solution in multiple closed mixing tanks to prepare soilless culture nutrient solutions with different pH values ​​and hydrogen concentrations, and adjust the opening or closing of each mixing tank according to the monitoring results of the pH value and hydrogen concentration of the soilless culture nutrient solution.

[0074] An irrigation system for the soilless culture nutrient solution irrigation method, specifically comprising:

[0075] (1) a feeding unit, including a liquid feeding device and a solid feeding device;

[0076] (1.1) A liquid supply device, including a water storage tank, at least one mother liquid tank and a liquid preparation tank, wherein the water storage tank and the mother liquid tank are respectively connected to the liquid preparation tank for mixing and storing premixed liquid, and the water storage tank and the liquid preparation tank are also respectively connected to the mixing tank for adjusting the concentration of the nutrient solution. Preferably, a metering device is provided at the outlet of each tank;

[0077] (1.2) The solid feeding device is a closed tank body. The solid feeding device can be separately arranged to be connected to each mixing tank, or can be separately fixed on the outer wall of the mixing tank.

[0078] (1.3) an acid liquid tank, for providing a quantitative pH regulator to each mixing tank. The acid liquid tank can be separately provided to be connected to each mixing tank, or can be fixed to the outer wall of the mixing tank.

[0079] (2) A mixing unit, comprising a plurality of closed mixing tanks, each of which is connected to a water storage tank, a liquid distribution tank, a solid feed device and an acid tank in the liquid supply device, and the outlet of each mixing tank is connected to the planting unit through an irrigation pipeline. Preferably, the mixing tank is provided with a pH sensor and a hydrogen concentration sensor, a stirring paddle and an optional outlet filter.

[0080] (3) A planting unit, including a planting rack and a plurality of planting pots thereon for planting plants, and an irrigation pipeline connecting each planting pot with a mixing tank.

[0081] The planting rack is also provided with a water seepage trough, a water return trough and an irrigator, each planting pot is respectively arranged in a single water seepage trough, and the liquid outlet end of each water seepage trough is connected to the water return trough;

[0082] An irrigator, including at least one of a sprinkler head, a drip irrigation head, and a pipe irrigation device, connected to the irrigation pipeline, inputting the soilless culture hydrogen-rich nutrient solution into various plant pots, and draining the excess hydrogen-rich nutrient solution into the infiltration tank;

[0083] (4) A liquid return unit, including a water return tank, a reflux pipeline and a liquid return tank. The liquid from the seepage tank is discharged into the water return tank and transported to the reflux tank by the reflux pipeline for storage and / or secondary utilization, thereby improving the utilization rate of the hydrogen-rich nutrient solution.

[0084] (5) a control unit, which is respectively arranged on the liquid supply device, the solid feed device, the metering device of the acid tank, the metering irrigation pump arranged at the outlet of the mixing tank, the pH sensor and the hydrogen concentration sensor arranged on the planting pot, and the optional temperature and humidity sensor;

[0085] The control unit is connected to the metering device, metering irrigation pump, pH sensor, hydrogen concentration sensor and optional temperature and humidity sensor signals, so as to send control instructions to each metering device and metering irrigation pump according to the monitoring results of each sensor.

[0086] The following examples 1-4 will be used to illustrate the irrigation method, irrigation system, and irrigation effect of the soilless culture nutrient solution of the present invention. The control groups involved in some of the examples are soilless culture plants that only use the same amount of conventional nutrient solution.

[0087] Planting group "Purple Rosa"

[0088] Control group 1-1

[0089] In this control group, the nutrient solution prepared by diluting Hoagland's nutrient solution 20 times with water was used to carry out soilless cultivation of the lettuce variety "Purple Rosa", and the cultivation period was 30 days.

[0090] Control group 1-2

[0091] The control group 1-2 cultivated the lettuce variety "Purple Rosa", provided a soilless culture nutrient solution containing solid hydrogen supply materials and an irrigation method, including:

[0092] S0, first use Hoagland nutrient solution and dilute it 20 times with water to prepare nutrient solution;

[0093] S1. Add the nutrient solution to the mixing tank, then add MgH 2 (Purity 99%) 0.576mmol / L, after 1 hour, a uniform soilless culture nutrient solution was obtained.

[0094] S2. The soilless culture nutrient solution is transported and applied to the soilless culture plants in the planting unit. The planting unit includes 10 planting pots, each with 40 plants, and the application method is watering. Each pot is watered with 2L of nutrient solution. The nutrient solution required for the next stage of plant growth is replaced every 7 days, and the application cycle is 30 days.

[0095] Example 1

[0096] Example 1 Cultivating the lettuce variety "Purple Rosa", providing a soilless culture nutrient solution containing a solid hydrogen supply material and an irrigation method, comprising:

[0097] S0, first use Hoagland nutrient solution and dilute it 20 times with water to prepare nutrient solution;

[0098] S1. Add the nutrient solution to the mixing tank, then add MgH 2 (purity 99%) 0.576mmol / L, and HNO 3 2mmol / L, and a uniform soilless culture nutrient solution was obtained after about 1 hour. The pH value and hydrogen concentration in the mixing tank were monitored. The pH value was within the set range of 5-6, and the hydrogen concentration reached more than 500ppb / L. Figure 2 As shown;

[0099] S2, transporting and applying the soilless culture nutrient solution to the soilless culture plants in the planting unit. The planting unit includes 10 planting pots, each with 40 plants, and the application method is watering, 2L of nutrient solution is watered in each pot, and the nutrient solution required for the next stage of plant growth is replaced every 7 days, and the application cycle is 30 days. The culture results of the control groups 1-1 to 1-2 and Example 1 are shown in Table 1:

[0100] Table 1

[0101] category Plant height (cm) Fresh weight of aboveground parts (g) Remark Control group 1-1 7.27±0.93b 5.37±0.49b - Control group 1-2 10.45±0.07a 13.33±3.53a <![CDATA[MgH 2 ]]> Example 1 11.67±0.56a 14.12±2.78a <![CDATA[MgH 2 Hydrated acid]]>

[0102] After 30 days of culture, MgH 2 The aboveground dry weight of the lettuce of the control group 1-2 and Example 1 was increased by more than 1 times, the plant height was increased by more than 40%, and the vitamin C content was increased by more than 4 times compared with the control group 1-1. The overall performance of Example 1 using acid for pH adjustment was better than that of the control group 1-2.

[0103] "Meiro" planting group

[0104] Control group 2-1

[0105] In this control group, the nutrient solution prepared by diluting Hoagland's nutrient solution 20 times with water was used to carry out soilless cultivation of the lettuce variety "Mei Luo".

[0106] Control group 2-2

[0107] The control group 2-2 cultivated the lettuce variety "Mei Luo" and provided a soilless culture nutrient solution containing solid hydrogen supply materials and an irrigation method, including:

[0108] S0, first use Hoagland's nutrient solution and water to prepare the nutrient solution; control group 2 is the nutrient solution prepared by diluting Hoagland's nutrient solution 20 times with water.

[0109] S1. Add the nutrient solution into a mixing tank, then add magnesium powder (purity 99%) to make the magnesium concentration 0.576 mmol / L, and wait for 1 hour.

[0110] S2. The soilless culture nutrient solution is transported and applied to the soilless culture plants in the planting unit. The planting unit includes 10 planting pots, each with 40 plants, and the application method is drip irrigation. The hydrogen concentration is set to 700-1000 ppb / L, and the hydrogen concentration in the mixing tank is monitored; the hydrogen magnesium nutrient solution is drip irrigated once every 2 hours, 5 times a day, and the application cycle is 30 days.

[0111] Control group 2-3

[0112] The difference between this control group and control group 2-2 is that the nutrient solution is added to the mixing tank, followed by the addition of MgH 2 (Purity 99%) 0.144mmol / L.

[0113] Example 2-1

[0114] Example 2-1 Cultivating the lettuce variety "Meiro", providing a soilless culture nutrient solution containing a solid hydrogen supply material and an irrigation method, including:

[0115] S0. First, dilute the Hoagland nutrient solution 20 times with water to prepare the nutrient solution.

[0116] S1. Add the nutrient solution to the mixing tank, then add magnesium powder (purity 99%) 0.576mmol / L, and HNO 3 1.0mmol / L, wait for 1 hour for drip irrigation to monitor the pH value and hydrogen concentration in the mixing tank. The results are shown in Figure 3 ; Drip irrigate the magnesium hydrogen nutrient solution once every 2 hours, 5 times a day, and the application cycle is 30 days. The pH value is in the set range of 5-6, and the hydrogen concentration reaches the set range of 700-1000ppb / L;

[0117] S2, transporting and applying the soilless culture nutrient solution to the soilless culture plants in the planting unit. The planting unit includes 10 planting pots, each with 40 plants.

[0118] Example 2-2

[0119] The difference between Example 2-2 and Example 2-1 is that the nutrient solution is added to the mixing tank, and then MgH 2 (purity 99%) 0.144mmol / L, and HNO 3 1.0mmol / L, the pH value and hydrogen concentration monitoring results of Example 2-2 are shown in Figure 3 shown.

[0120] The culture results of control groups 2-1 to 2-3 and examples 2-1 and 2-2 are shown in Table 2:

[0121] Table 2

[0122] Group Plant height (cm) Fresh weight of aboveground parts (g) Remark Control group 2-1 13.83±0.76ab 6.67±1.02b - Control group 2-2 14.17±0.76a 10.79±1.07a Magnesium powder Control group 2-3 15.17±0.76a 13.48±0.25a <![CDATA[MgH 2 ]]> Example 2-1 15.05±0.65a 11.52±0.89a Magnesium powder and acid Example 2-2 15.92±0.82a 14.78±0.65a <![CDATA[MgH 2 Hydrated acid]]>

[0123] After 30 days of culture, magnesium powder or MgH 2 The dry weight of the aboveground part of the lettuce in the control groups 2-2 and 2-3 and the examples 2-1 and 2-2 was increased by more than 60% compared with the control group 2-1, and the vitamin C content was increased by more than 2.5 times. The overall situation of the example 2-1 using acid to adjust the pH value was better than that of the control group 2-2, and the example 2-2 was better than the control group 2-3. Relatively speaking, the overall effect of the example 2-2 was further improved than that of the example 2-1, and the MgH 2 Relatively less magnesium powder.

[0124] Rice Planting Group

[0125] Control group 3-1

[0126] The nutrient solution prepared by diluting Kimura B rice nutrient mother solution and water 50 times was used to immerse and accelerate the germination of the rice variety "Jianhu Glutinous No. 1", and the germination rate was 73.3% (expressed as CK).

[0127] Control group 3-2

[0128] The difference between control group 3-2 and control group 3-1 is that MgH 2 (purity 99%) 2.5mmol / L, stirred for about 4h to obtain a uniform germination nutrient solution, and the rice variety "Jianhu Glutinous No. 1" was used for germination, and the germination rate was 79.3% (expressed as H-Mg), and the pH value was detected between 8-10 during the period.

[0129] Example 3

[0130] Example 3 (H-Mg / CBS) A soilless culture nutrient solution containing a solid hydrogen supply material is provided to soak and germinate the seeds of a rice variety "Jianhu Glutinous Rice No. 1", comprising:

[0131] S0, firstly, Kimura B rice nutrient solution and water are diluted 50 times to prepare a nutrient solution;

[0132] S1. Add the nutrient solution to the mixing tank, then add MgH 2 (purity 99%) 2.5mmol / L, and citric acid 0.5mmol / L, stirred for about 4 hours to obtain a uniform germination nutrient solution, wherein the pH value is in the set range of 5-6, and the hydrogen concentration reaches the set range of 700-1000ppb / L. The seeds are soaked in this nutrient solution for 1.5 days, and then taken out for germination for 1.5 days, and the germination rate reaches 83.3%.

[0133] Tomato Planting Group

[0134] Example 4 To cultivate tomatoes in a hydroponic culture environment, a soilless culture nutrient solution containing a solid hydrogen supply material and an irrigation method are provided, including:

[0135] S0, soilless culture nutrient solution: A soilless culture nutrient solution obtained by mixing the mother solutions A and B of the garden test nutrient solution with 100 times pure water;

[0136] S1. Add the nutrient solution into a mixing tank, then add 2.0 mmol / L of magnesium hydride (purity 99%) and an appropriate amount of citric acid, and stir for about 2 hours to obtain a uniform soilless culture nutrient solution;

[0137] S2. Add the soilless culture nutrient solution into the tomato planting tank by using a drip arrow, and irrigate once every 1 hour. Set the pH value to 5-6.5, the hydrogen concentration to 700-1000ppb / L, monitor the pH value and hydrogen concentration in the planting pot, and the control system maintains the pH value and hydrogen concentration within the set range by adding acid and hydrogen supplying materials.

[0138] Control group 4

[0139] The difference between Control Group 4 and Example 4 is that citric acid is not used.

[0140] The pH value and hydrogen concentration test results of Example 4 and Control Group 4 are as follows: Figure 4 Through monitoring and adjustment, the pH value of Example 4 is relatively stable, and the fluctuation range of hydrogen concentration is narrower than that of Control Group 4. The pH value of the Control Group is difficult to maintain within the set range of 5-6.5, and the long-term soilless cultivation effect cannot be guaranteed.

[0141] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the present invention is intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention.

Claims

1. A soilless culture nutrient solution containing a solid hydrogen supply material, characterized in that: The raw materials of the soilless culture nutrient solution include solid hydrogen supply material, nutrient solution and pH regulator; The dosage of solid hydrogen supply material is 0.05-5mmol / L; The dosage of pH regulator is 0.01-50mmol; The raw materials are mixed to provide a soilless culture nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8.

2. The soilless culture nutrient solution according to claim 1, characterized in that: The solid hydrogen supply material has a purity of 20-99% and includes at least one of Mg powder, MgH2, ammonia borane, KBH4, Mg(BH4)2, Ca(BH4)2, CaH2, and KH.

3. The soilless culture nutrient solution according to claim 1 or 2, characterized in that: The pH adjuster comprises one or more of HNO3, H2SO4, HCl, H3PO4, carbonic acid, amino acid, acetic acid, citric acid, formic acid, carboxylic acid, salicylic acid and its derivatives, fulvic acid, humic acid and its derivatives.

4. The soilless culture nutrient solution according to claim 3, characterized in that: The molar ratio of the solid hydrogen supply material to the acid is 10:(1-100).

5. A method for irrigating a soilless culture nutrient solution as claimed in any one of claims 1 to 4, characterized in that: The steps include: S1. Mix the measured raw materials evenly to obtain a soilless culture nutrient solution; S2, transporting and applying the soilless culture nutrient solution to the soilless culture plants; The pH value and hydrogen concentration of the soilless culture nutrient solution are monitored, and at least one of the application amount of the soilless culture nutrient solution, the application rate of the soilless culture nutrient solution, the amount of solid hydrogen supply material, and the amount of pH adjuster is adjusted to provide the soilless culture plants with a soilless culture nutrient solution with an irrigation hydrogen concentration of ≥500ppb / L and a pH value of 5-8.

6. The irrigation method according to claim 5, characterized in that: Before step S1, the nutrient solution is prepared using soilless nutrient mother solution and water.

7. The irrigation method according to claim 6, characterized in that: The solid hydrogen supply material, pH regulator and nutrient solution are mixed evenly in a closed mixing tank, and the proportion of the solid hydrogen supply material, pH regulator and nutrient solution in the mixing tank is adjusted according to the pH value and hydrogen concentration monitoring results of the soilless culture nutrient solution; and / or The measured solid hydrogen supply material, pH regulator and nutrient solution are evenly mixed in multiple closed mixing tanks to prepare soilless culture nutrient solutions with different pH values ​​and hydrogen concentrations. The opening or closing of each mixing tank is regulated according to the monitoring results of the pH value and hydrogen concentration of the soilless culture nutrient solution.

8. The irrigation method according to any one of claims 5 to 7, characterized in that: Step S2 satisfies at least one of the following conditions: 1) The soilless culture nutrient solution is applied to the plants through sprinkler irrigation, drip irrigation, pipe irrigation or a combination thereof; 2) After the soilless culture nutrient solution is applied and irrigated to the soilless culture plants, a recovery solution is formed, and the recovery solution is refluxed to prepare a nutrient solution.

9. An irrigation system for use in the irrigation method according to any one of claims 5 to 8, characterized in that: It includes a feeding unit, a mixing unit and a planting unit; A feeding unit, comprising a liquid feeding device and a solid feeding device; A mixing unit, comprising a plurality of closed mixing tanks, each of which is connected to the liquid supply device and the solid material supply device respectively; The planting unit comprises a plurality of planting pots for planting plants and an irrigation pipeline connecting the planting pots with a mixing tank.

10. The irrigation system according to claim 9, characterized in that The irrigation system further comprises a control unit, and metering devices respectively arranged at the liquid supply device and the solid supply device, a metering irrigation pump arranged at the outlet of the mixing tank, a pH sensor and a hydrogen concentration sensor arranged at the planting pot, and an optional temperature and humidity sensor; The control unit is connected to the metering device, the metering irrigation pump, the pH sensor, the hydrogen concentration sensor and the optional temperature and humidity sensor signals.

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