System for improving saline-alkali soil by using industrial carbon dioxide and method for increasing yield of green leaf vegetables by using system

Abstract

The invention relates to an industrial carbon dioxide improved saline-alkali soil system and a method for promoting yield increase of green leaf vegetables by using the system, and adopts the following technical scheme: the industrial carbon dioxide improved saline-alkali soil system is utilized to transform a land parcel, fine seeds are selected, sowing is performed in a dry sowing and wet outlet mode, flat furrows with the width of 1.7 m are made, passages with the width of 0.6 m are reserved between the furrows, four drip irrigation belts are laid on one furrow surface, and the laying mode is 25 cm + 40 cm + 40 cm + 40 cm + 25 cm; drip irrigation is carried out for 4-6 times in the whole growth period, the irrigation period is 7-9 days, the irrigation period is adjusted to 5-7 days in the water demand peak period, the irrigation quantity is 100-150 m < 3 > / mu, the acid aqueous solution is applied for 4-6 times, and the total carbon dioxide consumption is 20-30 kg / mu.

Description

Technical Field

[0001] The invention technology belongs to the agricultural field, in particular to a method for applying carbon dioxide to green leafy vegetables. Background Art

[0002] Carbon dioxide is a byproduct of industrial production. Most of the carbon dioxide produced by industrial production evaporates directly into the atmosphere. Only a small amount of carbon dioxide is used in agricultural production, but the economic benefits are not very obvious. Applying carbon dioxide to vegetables (green leafy) can not only increase plant photosynthesis and thus increase yield, but also consume a large amount of carbon dioxide, which is conducive to the goal of carbon neutrality and carbon peak.

[0003] Chinese patent 20241031192.6 discloses a "high-density cultivation method for non-heading cabbage". After the previous crop is harvested, the tillage is timely 20cm to 30cm, and every 667m 2 After applying 1000kg of decomposed organic fertilizer + 20kg of high-nitrogen compound fertilizer + 10kg of plant ash, rotary tillage is performed again, and the ridge is prepared; the N:P2O5:K2O in the high-nitrogen compound fertilizer is 25:5:10; 3 to 5 days after the ridge is prepared, 2mm18 rows are selected for sowing, and 1cm thick rice husk is covered after sowing and water is sprayed again. Within 7 days after sowing, water is sprayed once in the morning and evening every day. After 20 to 25 days in summer and autumn, and 25 to 30 days in winter and spring, after 4 to 5 leaves are grown, the whole garden is harvested. The present invention reduces the cultivation steps, can save a lot of labor costs and shorten the planting cycle, can plant multiple crops a year, improve the yield and quality of non-heading cabbage, and significantly improve economic benefits.

[0004] This method involves covering the seeds with 1 cm thick rice husks and spraying water again after sowing. Within 7 days after sowing, water is sprayed once in the morning and once in the evening every day. This method consumes a lot of manpower, so it is difficult to promote it to large-scale vegetable planting. Summary of the invention

[0005] The industrial carbon dioxide improving saline-alkali land system of the present invention solves the problems of the prior art that it consumes a lot of manpower and is difficult to promote to large-scale vegetable planting, and reduces direct carbon dioxide emissions to avoid wasting carbon resources.

[0006] The method for increasing the yield of green leafy vegetables by the system described in the present invention solves the problem of the prior art that it consumes a lot of manpower and is therefore difficult to promote to a large range of vegetable plantings, and reduces direct carbon dioxide emissions, avoids waste of carbon resources, and achieves the purpose of increasing the yield of green leafy vegetables.

[0007] The idea of ​​the present invention is to use industrial carbon dioxide to form an acidic aqueous solution after dissolving in water to neutralize the salt and alkali in the soil and discharge the salt and alkali out of the cultivated land through a salt discharge device, so as to achieve the purpose of completely improving the saline-alkali land. There is no problem of alkali return, because carbon dioxide is used to form an acidic aqueous solution, which reduces the emission of carbon dioxide and achieves waste gas utilization. A part of the overflowed carbon dioxide gas promotes the photosynthesis of green leafy vegetables under membrane drip irrigation, promotes the increase of green leafy vegetables, and achieves the purpose of reducing carbon, reducing costs and increasing efficiency.

[0008] In order to achieve the above-mentioned purpose, an industrial carbon dioxide system for improving saline-alkali land is adopted, which includes: a liquid carbon dioxide storage device, a carbon dioxide water dissolving device, a control device, a drip irrigation system and a salt discharge device; the above-mentioned drip irrigation system includes a head and a pipe network; the above-mentioned liquid carbon dioxide storage device is connected to the carbon dioxide water dissolving device through a pipe and is connected to the control device; the carbon dioxide water dissolving device is connected to the drip irrigation system through a pipe and is connected to the control device; the salt discharge device is arranged below the tillage layer and discharges the soil washing liquid.

[0009] Furthermore, in the industrial carbon dioxide improving saline-alkali land system, the carbon dioxide dissolving device comprises:

[0010] The cylinder body has two open ends connected to a circular steel pipe with flanges, the middle position of the top of the circular steel pipe is connected to the exhaust port, and the middle position of the side of the circular steel pipe near the water inlet is connected to the air inlet;

[0011] The air inlet is fixed in the middle of the side of the cylinder near the water inlet end by threading. The air inlet is connected to the air inlet pipe, check valve, air inlet pressure gauge, air inlet valve, and air inlet connection parts from the inside to the outside. The air inlet pipe is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0012] Exhaust port: The exhaust port is fixed at the middle position of the top end of the circular steel pipe by means of thread connection, and is connected to the pressure gauge and the exhaust valve from the inside to the outside.

[0013] Preferably, the air inlet pipe is located inside the cylinder and is a spiral tube with one end closed, and the spiral diameter is 1 / 3 to 2 / 3 of the inner diameter of the cylinder.

[0014] Preferably, the air intake pipe is composed of two layers, the inner layer is a polyvinyl chloride layer with circular small holes with a pore size of 0.3-0.5 mm for air intake, and the outer layer is a polypropylene layer with a microporous structure.

[0015] Furthermore, the drip irrigation system includes a drip irrigation belt; the flow rate of the drip irrigation belt is 1.0-2.8L / h, and an anti-reverse diffusion mechanism is provided on the flow channel. The mechanism can prevent the small amount of carbon dioxide gas precipitated due to the pressure reduction of the acidic aqueous solution entering the flow channel from flowing back, and continue to move forward with the water flow, and further dissolve into the water after the contact time is prolonged.

[0016] Furthermore, the salt discharge device is a salt discharge seepage pipe, which is a plurality of seepage pipes laid in parallel, with a diameter of 110-300 mm, a spacing of 25-35 meters, and a top of the seepage pipe 50-100 cm from the ground surface.

[0017] Furthermore, the salt discharge device is a salt discharge culvert, which is a plurality of parallel culverts with a width of 110-300 mm, a spacing of 25-35 meters, and a top of the culvert 50-100 cm from the ground surface.

[0018] Furthermore, the industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

[0019] Industrial carbon dioxide improved saline-alkali land system and a method for increasing the yield of green leafy vegetables using the system, characterized by comprising the following methods:

[0020] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0021] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system, evenly spread 400-600 kg of high-quality commercial organic fertilizer per mu, mechanically plow 20-30 cm, level and harrow, ensure smooth drainage and irrigation, make 1.7 m wide flat ridges, and leave 0.6 m aisles between ridges;

[0022] 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seeding rate per mu is 0.5-0.8 kg for pakchoi, 1-1.5 kg for chrysanthemum, and 1.5-2 kg for spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying pattern of 25cm+40cm+40cm+40cm+25cm. Water thoroughly.

[0023] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of green leafy vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0024] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. Apply the acidic aqueous solution from the first irrigation after the emergence of the seedlings. Drip irrigation is carried out 4 to 6 times during the whole growth period, with an irrigation cycle of 7 to 9 days. The irrigation cycle is adjusted to 5 to 7 days during the peak period of water demand, and the irrigation quantity is 100 to 150 m 3 / mu, apply acidic aqueous solution 4 to 6 times, and the total carbon dioxide dosage is 20 to 30 kg / mu;

[0025] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0026] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0027] Furthermore, in the preparation of the acidic aqueous solution in the above 4), when the industrial carbon dioxide in the carbon dioxide storage device is decompressed by the control device and dissolved in the water of the carbon dioxide water dissolving device, the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa, and the pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055-0.405MPa.

[0028] Furthermore, in the step 5) of dripping the acidic aqueous solution, when the acidic aqueous solution prepared in step 4) is added to the drip irrigation system through a control device for application, the pressure of the aboveground pipe network of the drip irrigation system is controlled to be 0.05-0.15 MPa.

[0029] Furthermore, the method of using industrial carbon dioxide to improve saline-alkali land system to promote the increase of green leafy vegetable production also includes using an industrial waste gas treatment system to prepare carbon dioxide, and the industrial waste gas passes through a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device to obtain liquid carbon dioxide and store it in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

[0030] The industrial carbon dioxide referred to in the present invention refers to carbon dioxide prepared using waste gas generated in industrial production as raw material, specifically refers to waste gas containing carbon monoxide and carbon dioxide, mainly including waste gas generated by coal chemical industry, petrochemical industry, chlor-alkali chemical industry, steelmaking and fermented wine processing industries.

[0031] At present, the waste gas generated by industries such as coal chemical industry, petrochemical industry, chlor-alkali chemical industry, steelmaking and fermented wine processing is tested and treated for harmful substances such as sulfur and phosphorus according to the national three-waste emission standards. The direct emission of carbon dioxide aggravates the greenhouse effect, which is not in line with the country's "dual carbon" policy and causes a waste of carbon resources. With the proposal of carbon neutrality and carbon peak, these enterprises are required to reduce the direct emission of carbon dioxide into the air. If the industrial carbon dioxide improvement saline-alkali land system and the method of using the system to reduce carbon and increase production are implemented on large areas of salinized land, carbon resources can be comprehensively utilized to improve soil salinization and promote crop production. It can also control environmental pollution caused by industrial waste gas emissions, help industrial enterprises achieve carbon neutrality and carbon peak, and thus achieve deep integration of industry and agriculture and common development.

[0032] The industrial carbon dioxide system for improving saline-alkali land and the method for using the system to promote the increase of green leafy vegetable production are simple to operate. The acidic aqueous solution containing carbon dioxide is applied to the crop root layer soil through the drip irrigation system, which can not only improve soil salinization and cause significant changes in the pH value and total salt content of the soil, but also use the bicarbonate ions in the carbon dioxide aqueous solution to neutralize the alkali metal ions in the soil to form bicarbonate salt water that is easy to move with water, and move with water to the salt discharge device, thereby being discharged from the soil, and finally improving the crop root layer soil. The carbon dioxide aqueous solution analyzes carbon dioxide in the middle of the soil at the roots of green leafy vegetables, and the precipitated carbon dioxide is absorbed by the leaves of the crops, promoting the photosynthesis of green leafy vegetables and promoting the increase of green leafy vegetables.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the figure, 1 is a header, 2 is a carbon dioxide dissolving device, 21 is a cylinder, 211 is a circular steel pipe, 212 is a flange, 213 is a screw, 22 is an exhaust port, 221 is a pressure gauge, 222 is an exhaust valve, 23 is an air inlet, 231 is an air inlet pressure gauge, 232 is an air inlet valve, 233 is an air inlet connecting component, 234 is a check valve, 235 is an air inlet pipe, 2351 is a polyvinyl chloride layer with circular small holes for air inlet, 2352 is a polypropylene layer with a microporous structure, 24 is a water inlet end, 25 is a water outlet end, 3 is a pipe network, 31 is a drip irrigation belt, 4 is a salt discharge device, 41 is a leakage pipe, 42 is a salt discharge ditch, 8 is a liquid carbon dioxide storage device, 91 is a control device, 92 is a pressure reducing valve, 93 is an electromagnetic valve, 10 is a carbon monoxide conversion device, 11 is a decarbonization device, 12 is a regeneration device, 13 is a desulfurization device, and 14 is a cooling and liquefaction device

[0035] Figure 1 This is a schematic diagram of the connection of an industrial carbon dioxide improved saline-alkali land system;

[0036] Figure 2 It is a schematic diagram of the overall structure of a carbon dioxide gas dissolving water device;

[0037] Figure 3 This is a schematic diagram of the air inlet pipe structure of the carbon dioxide gas dissolving device;

[0038] Figure 4 It is a schematic cross-sectional view of an air inlet pipe of a device for dissolving carbon dioxide gas in water;

[0039] Figure 5 This is a schematic diagram of the arrangement of the salt leakage pipe;

[0040] Figure 6 This is a schematic diagram of the layout of the salt drainage culvert;

[0041] Figure 7 Schematic diagram of the connection of the industrial carbon dioxide improved saline-alkali land system including the industrial waste gas treatment system. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation, structure, characteristics and effects of an industrial carbon dioxide improved saline-alkali land system and a method for increasing crop yield using the system proposed by the present invention are described in detail below in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0043] Example 1

[0044] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0045] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0046] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0047] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0048] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 1 / 3 of the inner diameter of the cylinder.

[0049] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.3 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0050] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0051] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 1.0 L / h.

[0052] When sowing, lay the mulch.

[0053] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 110 mm, the spacing is 25 meters, and the top of the seepage pipe 41 is 50 cm away from the ground surface.

[0054] Example 2

[0055] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0056] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0057] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0058] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0059] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 2 / 3 of the inner diameter of the cylinder.

[0060] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.5 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0061] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0062] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 2.8 L / h.

[0063] When sowing, lay the mulch.

[0064] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 300 mm, the spacing is 35 meters, and the top of the seepage pipe 41 is 100 cm away from the ground surface.

[0065] Example 3

[0066] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0067] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0068] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0069] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0070] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 1 / 2 of the inner diameter of the cylinder.

[0071] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.4 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0072] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0073] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 1.9 L / h.

[0074] When sowing, lay the mulch.

[0075] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 205 mm, the spacing is 30 meters, and the top of the seepage pipe 41 is 75 cm away from the ground surface.

[0076] Example 4

[0077] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 1: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 110 mm, the spacing is 25 meters, and the top of the salt discharge ditch 42 is 50 cm away from the ground surface.

[0078] Example 5

[0079] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 2: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 300 mm, the spacing is 35 meters, and the top of the salt discharge ditch 42 is 100 cm away from the ground surface.

[0080] Example 6

[0081] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 3: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 205 mm, the spacing is 30 meters, and the top of the salt discharge ditch 42 is 75 cm away from the ground surface.

[0082] Example 7

[0083] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7, which is different from Example 1: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. After being treated by the above industrial waste gas treatment system, the industrial waste gas of coal chemical industry (calcium carbide furnace tail gas, whose main components are CO 80%, H2 9%, N2 9%, and CO2 1%), under the action of a catalyst, the CO and water therein react in the carbon monoxide conversion device 10 to generate CO2 and H2, enter the decarbonization device 11 for treatment, and then enter the regeneration device 12. The resulting mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 99.5%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the control device 91 of the air inlet end 23 of the carbon dioxide water dissolving device 2.

[0084] Example 8

[0085] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , which is different from Example 2: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas from industrial enterprises such as steelmaking (a lime kiln gas containing 35% carbon dioxide, the rest 63% nitrogen, oxygen and carbon monoxide content of 1.9%, in addition, it also contains trace amounts of H2S and COS) reacts with water in the carbon monoxide conversion device 10 under the action of a catalyst to generate CO2 and H2, enters the decarbonization device 11 for treatment, and then enters the regeneration device 12. The resulting mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 99%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the control device 91 at the air inlet end 23 of the carbon dioxide dissolving device 2.

[0086] Example 9

[0087] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7, which is different from Example 3: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas of petrochemical enterprises (containing 20% ​​carbon dioxide, the rest 53% nitrogen, 25% oxygen and carbon monoxide, and 2% H2S and COS) reacts with water in the carbon monoxide conversion device 10 under the action of a catalyst to generate CO2 and H2, enters the decarbonization device 11 for treatment, and then enters the regeneration device 12. The resulting mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 98%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the terminal control device 91 at the air inlet end 23 of the carbon dioxide dissolving device 2.

[0088] Example 10

[0089] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , which is different from Example 4: an industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas of the soda ash production enterprise (another lime kiln gas contains 40% carbon dioxide, 59% nitrogen, and about 0.9% oxygen and carbon monoxide content). Under the action of the catalyst, CO and water react in the carbon monoxide conversion device 10 to generate CO2 and H2, enter the decarbonization device 11 for treatment, and then enter the regeneration device 12. The resulting mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 97%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the terminal control device 91 at the air inlet end 23 of the carbon dioxide dissolving device 2.

[0090] Embodiment 11

[0091] Based on Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7, which is different from Example 5: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is 96%.

[0092] Example 12

[0093] Based on Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , which is different from Example 6: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is 95%.

[0094] The following is an example of a method for improving saline-alkali land system and promoting the production of green leafy vegetables using industrial carbon dioxide.

[0095] Embodiment 13

[0096] The method for improving the saline-alkali land system and increasing the yield of green leafy vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 1 includes the following method:

[0097] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0098] 2) Farming preparation: Install an industrial carbon dioxide system to improve saline-alkali land, evenly spread 400 kg of high-quality commercial organic fertilizer per mu, mechanically plow the land to 20 cm, level and harrow it to ensure smooth drainage and irrigation, and make a 1.7 m wide flat bed with a 0.6 m aisle between beds;

[0099] 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seeding rate per mu is 0.5 kg of pakchoi, 1 kg of chrysanthemum and 1.5 kg of spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying mode of 25cm+40cm+40cm+40cm+25cm. Water thoroughly.

[0100] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of green leafy vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0101] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. Apply the acidic aqueous solution from the first irrigation after the emergence of the seedlings. Drip irrigation is carried out 4 times in the whole growth period, with an irrigation cycle of 7 days. The irrigation cycle is adjusted to 5 days during the peak period of water demand, and the irrigation quantity is 100m 3 / mu, apply acidic aqueous solution 4 times, the total carbon dioxide dosage is 20kg / mu;

[0102] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0103] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0104] Among them, the key points are as follows:

[0105] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is reduced in pressure by the pressure reducing valve and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055MPa.

[0106] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added to the drip irrigation system through the control valve for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the pressure of the aboveground pipe network of the drip irrigation system to 0.05MPa.

[0107] Embodiment 14

[0108] The method for improving the saline-alkali land system and increasing the yield of green leafy vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 2 includes the following method:

[0109] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0110] 2) Farming preparation: Install an industrial carbon dioxide system to improve saline-alkali land, evenly spread 600 kg of high-quality commercial organic fertilizer per mu, mechanically plow the land 30 cm, level and harrow it, ensure smooth drainage and irrigation, make a 1.7 m wide flat bed, and leave a 0.6 m aisle between the beds;

[0111] 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seeding rate per mu is 0.8 kg of pakchoi, 1.5 kg of chrysanthemum and 2 kg of spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying mode of 25cm+40cm+40cm+40cm+25cm. Water thoroughly.

[0112] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of green leafy vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0113] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. Apply the acidic aqueous solution from the first irrigation after the emergence of the seedlings. Drip irrigation is carried out 6 times during the whole growth period, with an irrigation cycle of 9 days. The irrigation cycle is adjusted to 7 days during the peak period of water demand, and the irrigation quantity is 150m 3 / mu, apply acidic aqueous solution 6 times, and the total carbon dioxide dosage is 30kg / mu;

[0114] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0115] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0116] Among them, the key points are as follows:

[0117] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is reduced in pressure by the pressure reducing valve and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.40MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.405MPa.

[0118] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added to the drip irrigation system through the control valve for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the pressure of the aboveground pipe network of the drip irrigation system to 0.15MPa.

[0119] Embodiment 15

[0120] The method for improving the saline-alkali land system and increasing the yield of green leafy vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 3 includes the following method:

[0121] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0122] 2) Farming preparation: Install an industrial carbon dioxide system to improve saline-alkali land, evenly spread 500 kg of high-quality commercial organic fertilizer per mu, mechanically plow the land 25 cm, level and harrow it, ensure smooth drainage and irrigation, make a 1.7 m wide flat bed, and leave a 0.6 m aisle between the beds;

[0123] 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seed rate per mu is 0.65kg for various green vegetables, 1.25kg for chrysanthemum, and 1.75kg for spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying pattern of 25cm+40cm+40cm+40cm+25cm, and water thoroughly.

[0124] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of green leafy vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0125] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. Apply the acidic aqueous solution from the first irrigation after the emergence of the seedlings. Drip irrigation is carried out 5 times in the whole growth period, with an irrigation cycle of 8 days. The irrigation cycle is adjusted to 6 days during the peak period of water demand, and the irrigation quantity is 125m 3 / mu, apply acidic aqueous solution 5 times, the total carbon dioxide dosage is 25kg / mu;

[0126] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0127] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0128] Among them, the key points are as follows:

[0129] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is reduced in pressure by the pressure reducing valve and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.225MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.230MPa.

[0130] 5) dripping the acidic aqueous solution, the acidic aqueous solution prepared in 4) is added to the drip irrigation system through the control valve for drip application, and the solenoid valve at the water outlet is started through the DCS control cabinet, and the pressure of the drip irrigation system is 0.10MPa.

[0131] Example 16

[0132] In the process of leafy vegetable cultivation and management in the Tianye Chemical Park test site in 2022, a method of using industrial carbon dioxide to improve saline-alkali land system to increase the yield of leafy vegetables was used to manage the cultivation of leafy vegetables, including the following methods:

[0133] 1) The pH values ​​of soil and water were measured to be 9.1 and 7.9 respectively, which indicated that the land was slightly saline-alkali. The industrial carbon dioxide system and plan for improving the saline-alkali land were determined;

[0134] 2) Farming preparation: Install an industrial carbon dioxide system to improve saline-alkali land, evenly spread 500 kg of high-quality commercial organic fertilizer per mu, mechanically plow the land 25 cm, level and harrow it, ensure smooth drainage and irrigation, make a 1.7 m wide flat bed, and leave a 0.6 m aisle between the beds;

[0135] 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seeding rate per mu is 0.65kg for pakchoi, 1.25kg for chrysanthemum and 1.75kg for spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying pattern of 25cm+40cm+40cm+40cm+25cm. Water thoroughly.

[0136] 4) Prepare acidic aqueous solution: determine the soil pH value after irrigation in 3), and use the conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution to be 5.7. Combined with the growth habits, soil environmental requirements and water demand of green leafy vegetables, and referring to the water source pH value determined in 1), use the pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolve the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide dissolving device after reducing the pressure by the control device to form an acidic aqueous solution with the above pH value. Start the water inlet solenoid valve through the DCS control cabinet, and control the internal pressure of the carbon dioxide dissolving device at 0.100MPa. Adjust the air inlet pressure reducing valve of the carbon dioxide dissolving device, and the air inlet pressure of the carbon dioxide dissolving device shall not be lower than the internal pressure of the carbon dioxide dissolving device, which is controlled at 0.105MPa.

[0137] 5) Drip application of acidic aqueous solution: add the prepared acidic aqueous solution into the drip irrigation system through the control device for application, start the solenoid valve at the water outlet through the DCS control cabinet, the pressure of the drip irrigation system is 0.08MPa, and the acidic aqueous solution is applied from the first irrigation after the emergence of the seedlings;

[0138] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0139] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: according to the pH value of the soil measured before applying the acidic aqueous solution, determine the pH value of the acidic aqueous solution when applying the acidic aqueous solution this time, and determine the amount of carbon dioxide added when applying the acidic aqueous solution this time according to the pH value of the acidic aqueous solution applied this time: drip irrigation is carried out 5 times in the whole growth period, with an irrigation cycle of 8 days, and the irrigation cycle is adjusted to 6 days during the peak period of water demand, and the irrigation quantity is 125m 3 / mu, the acidic aqueous solution was applied 5 times, and the total carbon dioxide dosage was 25 kg / mu. The actual yield (kg / m 2 ) The data are as follows:

[0140]

[0141] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. Industrial carbon dioxide improves saline-alkali land system, characterized by: It includes a liquid carbon dioxide storage device, a carbon dioxide water dissolving device, a control device, a drip irrigation system and a salt discharge device; the above-mentioned drip irrigation system includes a head and a pipe network; the above-mentioned liquid carbon dioxide storage device is connected to the carbon dioxide water dissolving device through a pipe and is connected to the control device; the carbon dioxide water dissolving device is connected to the drip irrigation system through a pipe and is connected to the control device; the salt discharge device is arranged below the tillage layer and discharges the soil washing liquid.

2. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The carbon dioxide dissolving device comprises: The cylinder body has two open ends connected to a circular steel pipe with flanges, the middle position of the top of the circular steel pipe is connected to the exhaust port, and the middle position of the side of the circular steel pipe near the water inlet is connected to the air inlet; The air inlet is fixed in the middle of the side of the cylinder near the water inlet end by threading. The air inlet is connected to the air inlet pipe, check valve, air inlet pressure gauge, air inlet valve, and air inlet connection parts from the inside to the outside. The air inlet pipe is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system. Exhaust port: The exhaust port is fixed at the middle position of the top end of the circular steel pipe by means of thread connection, and is connected to the pressure gauge and the exhaust valve from the inside to the outside.

3. The industrial carbon dioxide improving saline-alkali land system according to claim 2, characterized in that: The air inlet pipe of the carbon dioxide water dissolving device is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 1 / 3 to 2 / 3 of the inner diameter of the cylinder.

4. The industrial carbon dioxide improving saline-alkali land system according to claim 2, characterized in that: The air inlet pipe of the carbon dioxide water dissolving device is composed of two layers, the inner layer is a polyvinyl chloride layer with circular small holes with a diameter of 0.3-0.5 mm for air intake, and the outer layer is a polypropylene layer with a microporous structure.

5. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The drip irrigation system includes an underground pipe network and an above-ground pipe network; the above-ground pipe network includes a drip irrigation belt; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 1.0-2.8L / h.

6. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The salt discharge device is a salt discharge seepage pipe, which is a plurality of seepage pipes laid in parallel, with a diameter of 110-300 mm, a spacing of 25-35 meters, and a top of the seepage pipe 50-100 cm away from the ground surface.

7. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The salt discharge device is a salt discharge culvert, which is a plurality of parallel culverts, with a culvert width of 110-300 mm, a spacing of 25-35 meters, and a top of the culvert 50-100 cm from the ground surface.

8. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: It also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

9. A method for increasing the yield of green leafy vegetables using the industrial carbon dioxide improved saline-alkali land system according to any one of claims 1 to 8, characterized in that The following methods are included: 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide; 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system, evenly spread 400-600 kg of high-quality commercial organic fertilizer per mu, mechanically plow 20-30 cm, level and harrow, ensure smooth drainage and irrigation, make 1.7 m wide flat ridges, and leave 0.6 m aisles between ridges; 3) Sowing: Sow the seeds evenly on the bed surface. Generally, the seeding rate per mu is 0.5-0.8 kg for pakchoi, 1-1.5 kg for chrysanthemum, and 1.5-2 kg for spinach. After sowing, rake shallowly and lay drip irrigation tapes. Four drip irrigation tapes are laid on one bed surface in a laying pattern of 25cm+40cm+40cm+40cm+25cm. Water thoroughly. 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of green leafy vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value; 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. Apply the acidic aqueous solution from the first irrigation after the emergence of the seedlings. Drip irrigation is carried out 4 to 6 times during the whole growth period, with an irrigation cycle of 7 to 9 days. The irrigation cycle is adjusted to 5 to 7 days during the peak period of water demand, and the irrigation quantity is 100 to 150 m 3 / mu, apply acidic aqueous solution 4 to 6 times, and the total carbon dioxide dosage is 20 to 30 kg / mu; 6) The salt discharge device discharges the soil elution generated in 5) above; Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

10. The method for improving saline-alkali land system by using industrial carbon dioxide as claimed in claim 9, characterized in that: In the above 4), when the industrial carbon dioxide in the carbon dioxide storage device is dissolved in the water of the carbon dioxide water dissolving device after being decompressed by the control device, the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa, and the pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055-0.405MPa.

11. The method for improving saline-alkali land system by using industrial carbon dioxide as claimed in claim 9, characterized in that: In the above 5), when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the aboveground pipe network pressure of the drip irrigation system is controlled to be 0.05-0.15 MPa.

Images