System for improving saline-alkali soil by industrial carbon dioxide and method for promoting yield increase of root vegetables by using system

Abstract

The invention discloses an industrial carbon dioxide improved saline-alkali soil system and a method for promoting yield increase of root 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, a one-film two-pipe four-row dry sowing and wet discharging mode is adopted to sow, the row spacing is 25 cm + 40 cm + 25 cm + 50 cm, the plant spacing is set according to the requirement of varieties on density, and the plant spacing is set according to the requirement of varieties on density. After final singling of seedlings, irrigation and topdressing are conducted for the first time, irrigation is generally conducted once every 7-9 days later, and 25 kg of diammonium phosphate, 20 kg of potassium sulfate or 20 kg of urea and 25 kg of ternary composite water-soluble fertilizer are topdressed in the whole growth period in combination with irrigation; from the first time of irrigation and topdressing, a carbon dioxide aqueous solution can be dripped during each time of irrigation, and the dosage of carbon dioxide is 5-7kg / 667m < 2 > each time.

Description

Technical Field

[0001] The invention technology belongs to the field of agriculture, in particular to a technology for applying carbon dioxide in agriculture. Background Art

[0002] Whether it is grain crops or vegetables, their fruits are mostly composed of carbohydrates, with very little trace elements. The formation of carbohydrates requires "gas (carbon dioxide), water, and light", that is, photosynthesis. Carbon dioxide is the main raw material for photosynthesis of crops. Insufficient carbon dioxide will cause vegetable growth to stagnate, affecting yield and quality.

[0003] Take root vegetables as an example: during the day, under the sunlight, the leaves accumulate carbohydrates through photosynthesis; at night, the leaves distribute the carbohydrates stored during the day through aerobic respiration, a small part of which is transported to the roots and the plant for use in the development of the root system and the plant, and the vast majority of the rest is transported to the fruit. This cycle repeats itself, causing the plants to gradually grow taller and the yield to gradually form.

[0004] Chinese Patent No. 202210909281.7 discloses a carrot cultivation method, including pre-sowing preparation, seed treatment, direct seeding with seed ropes, field management, pest and disease control, and harvesting. The field management includes the following steps: seedling selection, water management, drip irrigation and topdressing, inter-cultivation and soil cultivation, prevention of root divergence, and prevention of root cracking. Water management refers to drip irrigation to keep the soil moist. The first drip irrigation is to apply 50% dichlorodiphenylphosphine emulsifiable concentrate with water, and the usage amount is 1-2 kg / 667 m 2 Drip irrigation and topdressing refers to the application of high nitrogen water-soluble fertilizer and biological protein solution by drip irrigation after seedlings, and balanced water-soluble fertilizer in the early stage of fleshy root expansion; high potassium water-soluble fertilizer is applied after ridge sealing; seed treatment refers to the pelleting of seeds and processing them into seed strips with a seed spacing of 3 to 6 cm. A fully mechanized and standardized cultivation technology has been established, which has improved the operating efficiency of carrot planting and achieved high quality, high yield and high efficiency of carrots.

[0005] The disadvantages of the above prior art are that the seeds need to be pelletized and processed into seed strips with a seed spacing of 3 to 6 cm, which increases the planting cost. Summary of the invention

[0006] The industrial carbon dioxide improving saline-alkali land system of the present invention solves the technical problems existing in the prior art such as the need for seed pelletization treatment.

[0007] The industrial carbon dioxide improved saline-alkali land system to promote the yield increase of root vegetables in the present invention solves the technical problems existing in the prior art such as the need for seed pelleting treatment, reduces direct carbon dioxide emissions, avoids waste of carbon resources, and achieves the purpose of increasing the yield of root vegetables.

[0008] The idea of ​​the present invention is to use industrial carbon dioxide to dissolve in water to form an acidic aqueous solution 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 root vegetables under membrane drip irrigation, promotes the increase of root vegetables, and achieves the purpose of reducing carbon, reducing costs and increasing efficiency.

[0009] 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.

[0010] Furthermore, in the industrial carbon dioxide improving saline-alkali land system, the carbon dioxide dissolving device comprises:

[0011] 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;

[0012] The air inlet is fixed in the middle of the side of the cylinder near the water inlet end by means of a pair of threads. The air inlet is connected to the air inlet pipe, the check valve, the air inlet pressure gauge, the air inlet valve, and the air inlet connecting parts 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.

[0013] 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 in sequence.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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%.

[0020] Furthermore, the industrial carbon dioxide improving saline-alkali land system also includes a laid ground film.

[0021] The method for improving saline-alkali land system and increasing the yield of root vegetables by using industrial carbon dioxide comprises the following steps:

[0022] 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;

[0023] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0024] 3) Film laying and sowing: When the ground temperature 5cm below the film is stable at above 15℃, sowing can be carried out. The drip irrigation tape, film laying and sowing are laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after sowing, and the water volume is 375m 3 / hm 2 ;

[0025] 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 root 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;

[0026] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 7-9 days. During the whole growth period, 25kg of diammonium phosphate, 20kg of potassium sulfate or 20kg of urea, and 25kg of ternary composite water-soluble fertilizer are applied in combination with irrigation. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide applied each time is 5-7kg / 667m 2 ;

[0027] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0028] 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.

[0029] Furthermore, in the 4) preparation of the acidic aqueous solution, 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 solenoid valve at the water inlet end is started by the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa. 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 0.055-0.405MPa.

[0030] Furthermore, in the drip application of the acidic aqueous solution in step 5), when the acidic aqueous solution prepared in step 4) is added to the drip irrigation system through the control device for application, the outlet solenoid valve is started through the DCS control cabinet to control the aboveground pipe network pressure of the drip irrigation system to 0.05-0.15 MPa.

[0031] 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.

[0032] 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 national emission standards. The direct emission of carbon dioxide aggravates the greenhouse effect, is not in line with national policies, and causes a waste of carbon resources. 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 a large area of ​​salinized land, carbon resources can be comprehensively utilized to improve soil salinization and promote crop production, and environmental pollution caused by industrial waste gas emissions can be controlled, thereby deeply integrating industry and agriculture and developing together.

[0033] The industrial carbon dioxide improvement saline-alkali land system and the method for using the system to promote the increase of root vegetable production are simple to operate. The existing water-saving drip irrigation system is used, and the acidic aqueous solution containing carbon dioxide is applied to the crop root layer soil along with the drip irrigation system, which can not only improve soil salinization and make the pH value and total salt content of the soil change significantly, but also use the bicarbonate ions of the carbon dioxide aqueous solution to neutralize the alkali metal ions in the soil to form bicarbonate 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, while the carbon dioxide aqueous solution analyzes carbon dioxide in the middle of the root soil of the root vegetable. Due to the covering effect of the mulch, the precipitated carbon dioxide is trapped in the soil root layer and absorbed by the root system of the root vegetable, thereby promoting the photosynthesis of the root vegetable and promoting the increase of the production and efficiency of the root vegetable.

[0034] 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

[0035] 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

[0036] Figure 1 This is a schematic diagram of the connection of an industrial carbon dioxide improved saline-alkali land system;

[0037] Figure 2 It is a schematic diagram of the overall structure of a carbon dioxide gas dissolving water device;

[0038] Figure 3 This is a schematic diagram of the air inlet pipe structure of the carbon dioxide gas dissolving device;

[0039] Figure 4 It is a schematic cross-sectional view of an air inlet pipe of a device for dissolving carbon dioxide gas in water;

[0040] Figure 5 This is a schematic diagram of the arrangement of the salt leakage pipe;

[0041] Figure 6 This is a schematic diagram of the layout of the salt drainage culvert;

[0042] 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

[0043] 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.

[0044] Example 1

[0045] 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.

[0046] 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;

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 .

[0052] 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.

[0053] When sowing, lay the mulch.

[0054] 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.

[0055] Example 2

[0056] 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.

[0057] 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;

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 .

[0063] 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.

[0064] When sowing, lay the mulch.

[0065] 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.

[0066] Example 3

[0067] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5An 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.

[0068] 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;

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 .

[0074] 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.

[0075] When sowing, lay the mulch.

[0076] 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.

[0077] Example 4

[0078] 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.

[0079] Example 5

[0080] 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.

[0081] Example 6

[0082] 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.

[0083] Example 7

[0084] 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.

[0085] Example 8

[0086] 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.

[0087] Example 9

[0088] 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.

[0089] Example 10

[0090] 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.

[0091] Embodiment 11

[0092] 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%.

[0093] Example 12

[0094] 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%.

[0095] The following is an example of a method for improving saline-alkali land system and promoting the production of root vegetables using industrial carbon dioxide.

[0096] Example 13

[0097] The method for improving the saline-alkali land system and increasing the yield of root vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 1 includes the following method:

[0098] 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;

[0099] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0100] 3) Film laying and sowing: When the ground temperature 5cm below the film is stable at above 15℃, sowing can be carried out. The drip irrigation tape, film laying and sowing are laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after sowing, and the water volume is 375m 3 / hm 2 ;

[0101] 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 root 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;

[0102] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 7 days. During the whole growth period, 25kg of diammonium phosphate and 20kg of potassium sulfate are applied in combination with irrigation. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide applied each time is 5kg / 667m 2 ;

[0103] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0104] 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.

[0105] Among them, the key points are as follows:

[0106] 4) In the preparation of the acidic aqueous solution, 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 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.

[0107] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.05MPa.

[0108] Embodiment 14

[0109] The method for improving the saline-alkali land system and increasing the yield of root vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 2 includes the following method:

[0110] The method for improving the saline-alkali land system and increasing the yield of root vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 1 includes the following method:

[0111] 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;

[0112] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0113] 3) Film laying and sowing: When the ground temperature 5cm below the film is stable at above 15℃, sowing can be carried out. The drip irrigation tape, film laying and sowing are laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after sowing, and the water volume is 375m 3 / hm 2 ;

[0114] 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 root 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;

[0115] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 9 days. During the whole growth period, 20kg of urea and 25kg of ternary composite water-soluble fertilizer are applied in combination with irrigation. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide applied each time is 7kg / 667m 2 ;

[0116] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0117] 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.

[0118] Among them, the key points are as follows:

[0119] 4) In the preparation of the acidic aqueous solution, 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 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.

[0120] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.15MPa.

[0121] Embodiment 15

[0122] The method for improving the saline-alkali land system and increasing the yield of root vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 3 includes the following method:

[0123] The method for improving the saline-alkali land system and increasing the yield of root vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 1 includes the following method:

[0124] 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;

[0125] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0126] 3) Film laying and sowing: When the ground temperature 5cm below the film is stable at above 15℃, sowing can be carried out. The drip irrigation tape, film laying and sowing are laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after sowing, and the water volume is 375m 3 / hm 2 ;

[0127] 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 root 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;

[0128] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application. After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 8 days. During the whole growth period, 25kg of diammonium phosphate and 20kg of potassium sulfate are applied in combination with irrigation. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide applied each time is 6kg / 667m 2 ;

[0129] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0130] 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.

[0131] Among them, the key points are as follows:

[0132] 4) In the preparation of the acidic aqueous solution, 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 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.

[0133] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.10MPa.

[0134] Example 16

[0135] In the process of root vegetable cultivation and management in the Tianye Chemical Park experimental site in 2022, a method of industrial carbon dioxide improvement of saline-alkali land system to promote crop income increase was used to manage the cultivation of root vegetables, including the following methods:

[0136] 1) The pH values ​​of soil and water were measured to be 9.1 and 7.9 respectively, to determine whether it was saline-alkali land, and to design and determine the industrial carbon dioxide improvement system and plan for saline-alkali land;

[0137] 2) Preparation for farming: The equipment in Example 7 is installed in place. Since the Tianye Chemical Park test site is located in the chemical park and is close to the industrial waste gas treatment system of the calcium carbide furnace tail gas, the liquid carbon dioxide (with a purity of 99.9%) obtained through the carbon monoxide conversion device, decarbonization device, regeneration device, desulfurization device, and cooling liquefaction device is directly transported through a pipeline to the carbon dioxide water dissolving device located at the head of the drip irrigation system of the Tianye Chemical Park test site, and is connected to the pressure reducing valve of the control device;

[0138] 3) When the ground temperature 5cm below the film is stable at above 15℃, sowing can be carried out. The drip irrigation tape, film and sowing can be laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after sowing. The water volume is 375m 3 / hm 2 After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 8 days. During the whole growth period, 20kg of urea and 25kg of ternary compound water-soluble fertilizer are applied in combination with irrigation. From the first irrigation and topdressing, carbon dioxide solution can be dripped during each irrigation. The amount of carbon dioxide applied each time is 6kg / 667m 2 ;

[0139] 4) Prepare acidic aqueous solution: determine the soil pH value after irrigation in 3), and use the conventional neutralization reaction calculation formula to determine that the pH value of the acidic aqueous solution is 5.7. Combined with the growth habits of root vegetables, soil environmental requirements and water demand patterns, refer to the water source pH value determined in 1), and use the pH adjustment calculation formula to determine the amount of carbon dioxide to be added. 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 is not lower than the internal pressure of the carbon dioxide dissolving device, which is controlled at 0.105MPa.

[0140] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application, start the water outlet solenoid valve through the DCS control cabinet, the pressure of the drip irrigation system is 0.08MPa, and apply the acidic aqueous solution from the ear stage. Before each application of the acidic aqueous solution, measure the soil pH value, and then perform the above 4) and 5) in sequence: According to the soil pH value measured before the application of 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. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide used each time is 6kg / 667m 2 ;

[0141] 6) After being treated by the above method, the salt water in the soil is discharged through the salt drainage seepage pipe.

[0142] The actual yield (kg / 666.67m2) of the planting area using the scheme of the present invention and the planting area using the conventional method is 2 ) The data are as follows:

[0143]

[0144]

[0145] 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 changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An industrial carbon dioxide improvement system for saline-alkali land, 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 1, characterized in that: The air inlet pipe is located inside the cylinder and is a spiral-shaped circular pipe 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 1, characterized in that: The air intake pipe 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 comprises a drip irrigation belt; the flow rate of the drip irrigation belt is 1.0-2.8 L / h, and an anti-reverse diffusion mechanism is arranged on the flow channel.

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. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: Also includes the mulch that is laid.

10. A method for increasing the yield of root vegetables by using the system for improving saline-alkali land using industrial carbon dioxide according to any one of claims 1 to 9, characterized in that The steps include: 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; 3) Film laying and sowing: When the ground temperature at 5cm is stable above 15℃, the film can be laid and sown. The drip irrigation tape, film laying and sowing are laid by the sub-film drip irrigation seeder. The film width is 115cm. The mode of one film, two tubes and four rows is adopted. The drip irrigation tape is laid between two plantings. The row spacing is 25cm+40cm+25cm+50cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out after sowing, and the water volume is 375m 3 / hm 2 ; 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 root 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. After the seedlings are settled, the first irrigation and topdressing are carried out. After that, irrigation is generally carried out once every 7-9 days. During the whole growth period, 25kg of diammonium phosphate, 20kg of potassium sulfate or 20kg of urea, and 25kg of ternary composite water-soluble fertilizer are applied in combination with irrigation. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide applied each time is 5-7kg / 667m 2 ; 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.

11. The method for improving saline-alkali land system by using industrial carbon dioxide to increase the yield of root vegetables according to claim 10, characterized in that: In the preparation of the acidic aqueous solution, 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 water inlet end solenoid valve is started by the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa. 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 0.055-0.405MPa.

12. The method for improving saline-alkali land system by using industrial carbon dioxide to increase the yield of root vegetables according to claim 10, characterized in that: 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 outlet solenoid valve is started through a DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to be 0.05-0.15 MPa.

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