A mineral conditioner suitable for improving coastal saline soil and its preparation method

Abstract

This invention provides a mineral conditioner suitable for improving coastal saline soils. The mineral conditioner includes agent A, agent B, and agent C. Agent A is an alkaline soil conditioner, agent B is an acidic soil conditioner, and agent C is a biological conditioner. Agent A, by mass ratio, includes 10-90% activated carbon, 10-90% H-103 macroporous resin, and 15-40% zeolite. Agent B, by mass ratio, includes 15-35% quicklime, 25-55% hydrated lime, and 30-65% activated alumina. Agent C, by mass ratio... The mixture comprises 1-5% cyanobacterial bacterial solution, 0.1-0.6% calcium chloride, 0.1-0.5% dipotassium hydrogen phosphate, 0.3-0.8% ferric sulfate, 0.1-1.0% potassium sulfate, 0.5-1.0% sodium chloride, and the remainder is water. When used in combination with other reagents, it offers great flexibility in practical applications. Furthermore, this conditioner can improve coastal saline soil to industrial land standards, reducing erosion of buildings, and can also improve coastal saline soil to agricultural land standards, increasing soil fertility in addition to improving saline soil.

Description

Technical Field

[0001] This invention relates to the field of soil improvement, specifically to a mineral conditioner suitable for improving coastal saline soil and its preparation method. Background Technology

[0002] Coastal saline soils are soils developed from saline silt in coastal areas. Their formation involves salinization preceding soil formation, and can be divided into two stages: first, the geological deposition stage of salt, where continuous leaching by highly mineralized seawater enriches the near-shore sediments with large amounts of soluble salts. Once the soil emerges from the water and becomes land, the salts begin to redistribute and accumulate on the surface; second, the formation stage of saline soil, where the saline silt develops into coastal saline soil with the emergence of higher plants. Its characteristics are: ① Heavy salt accumulation in the surface layer, with high salt content in the subsoil and core. ② Generally high groundwater mineralization, increasing with distance from the sea. ③ The salt composition is mainly sodium chloride, with chloride ions accounting for 80-90% of the total anions. Except for the "saline-acid fields" in southern coastal areas which exhibit a strongly acidic reaction, the pH value is generally greater than 8.0.

[0003] In northern my country, such as the Yellow River Delta region of Shandong, the Cangzhou region of Hebei, and the Tianjin region, the parent material of coastal saline soils is coastal sediment. The soil profile consists of distinct layers including salt deposits, grass cover, sedimentary layers, tidal flats, and gleyed layers. The salinity composition of the entire soil and groundwater is basically consistent with that of seawater, with chlorides being the most dominant, accounting for over 80% of anions, followed by sulfates and bicarbonates. The dominant cations in the salts are sodium and potassium ions, followed by calcium and magnesium ions.

[0004] In southern my country, such as the coastal provinces of Guangdong, Guangxi, Hainan, and Fujian, the coastal saline soils are acidic and rich in sulfates. Under aeration, the acidic sulfate soils oxidize to produce sulfuric acid, causing a sharp drop in soil pH. This leads to a surge in the solubility of elements such as aluminum, iron, and manganese in the soil. At the same time, the strongly acidic sulfate environment causes soluble phosphorus to form insoluble phosphates and soluble potassium to form insoluble jaundice, resulting in phosphorus and potassium deficiencies.

[0005] The world's saline soil area is approximately 1 billion hectares; my country's saline soil area is approximately 34.6 million hectares, of which about 2.4 million hectares are coastal saline soil. Due to high soil salinity, lack of freshwater resources, low nutrient content, and high soil erosion, the growth of crops and the lifespan of buildings in coastal areas are severely affected, seriously restricting the development of coastal areas. Improving coastal saline soil has become an urgent problem to be solved.

[0006] Currently, engineering measures such as trenching to drain acidic soil or applying lime to improve acidic saline soils are commonly used. However, while engineering measures are effective at draining acid during flooding, soil acidity can increase significantly during the drying or exposed stages, jeopardizing crops. Using lime to improve soil acidity is ineffective in small quantities, and long-term, excessive use of lime can lead to soil compaction and increased phosphorus fixation. Research has also found that acidic sulfate soils generally lack essential nutrients for crop growth, such as nitrogen, phosphorus, and potassium.

[0007] Currently, there are four main methods for improving alkaline saline soil: physical improvement, water conservancy improvement, chemical improvement, and biological improvement. However, each of these methods has its own advantages and disadvantages. For example, physical improvement methods such as bottom sealing and raising the ground with topsoil require too much investment; water conservancy improvement methods such as large-scale water washing cause water waste; biological improvement methods such as microbial fertilizers are a sustainable measure, but they have problems such as single strains and low survival rates; and current chemical improvement methods have limited performance and are prone to reducing soil moisture and causing soil compaction.

[0008] Applying soil conditioners to improve saline soil is an economical and convenient method. It can improve the physical and chemical properties of the soil, enhance the soil's water and soil retention capacity, reduce salt stress in saline-alkali soil, and improve crop yield and quality.

[0009] However, current research on the improvement of saline-alkali coastal soils is extensive, including compound soil conditioners containing various materials such as biochar, calcium sulfate, composted plant materials, and humic acid, as well as engineering improvement measures related to irrigation and salt removal. There are many methods for improvement, but there is a lack of soil conditioners specifically designed for saline-alkali coastal soils. The improvement of saline-alkali coastal soils must be based on local soil conditions, and functional, efficient, environmentally friendly, and economical soil conditioners should be developed.

[0010] This invention provides a soil mineral conditioner for improving coastal saline soil. Unlike existing conditioners, this invention divides the conditioner into three parts: Agent A, Agent B, and Agent C. These components can be combined in pairs to work synergistically to condition the soil. Compared to existing conditioners that mix all components into a single solution, this invention's conditioner can be used in combination with two of the reagents, depending on local soil conditions, making it highly flexible in practical application. Furthermore, this invention's conditioner combines physical, chemical, and biological improvement methods, enabling it to improve coastal saline soil to industrial land standards, reducing erosion on buildings, or to agricultural land standards. In addition to improving saline soil, it also increases soil fertility.

[0011] Most importantly, the mineral conditioner of this invention is highly efficient and environmentally friendly, and its preparation is simple, with low raw material costs, making it highly economical. Summary of the Invention

[0012] This invention provides a mineral conditioner suitable for improving coastal saline soil and its preparation method, wherein the mineral conditioner includes agent A, agent B, and agent C;

[0013] Agent A is an alkaline soil conditioner, Agent B is an acidic soil conditioner, and Agent C is a biological conditioner;

[0014] The A agent, by mass ratio, comprises 10-90% activated carbon, 10-90% H-103 macroporous resin, and 15-40% zeolite; the A agent is mainly used to improve alkaline coastal saline soil.

[0015] The B agent, by mass ratio, comprises 15-35% quicklime, 25-55% hydrated lime, and 30-65% activated alumina; the B agent is mainly used to improve acidic coastal saline soils.

[0016] The C agent, by mass ratio, comprises 1-5% cyanobacterial bacterial solution, 0.1-0.6% calcium chloride, 0.1-0.5% dipotassium hydrogen phosphate, 0.3-0.8% ferric sulfate, 0.1-1.0% potassium sulfate, 0.5-1.0% sodium chloride, and the remainder is water; the C agent is mainly used to improve soil fertility and further reduce the salt content in the soil.

[0017] Preferably, agent A is specifically divided into agent A1 and agent A2. Agent A1 has the same composition as agent A, and agent A2, in addition to agent A, also includes 15-35% gypsum, 10-20% ferrous sulfate, and 10-25% calcium chloride.

[0018] The reason for classifying Agent A into Agent A1 and Agent A2 is that their soil improvement mechanisms differ. Agent A1 primarily uses physical adsorption to reduce anions in the soil, belonging to physical improvement. Agent A2, based on Agent A1, adds gypsum, ferrous sulfate, and calcium chloride to reduce sodium ions in the soil, belonging to a combination of physical and chemical improvement. Furthermore, the application of Agent A1 and Agent A2 differs. Land improved with Agent A1 has most of its anions adsorbed, significantly reducing the erosive effect of anions, making it suitable for industrial use. Land improved with Agent A2, in addition to the adsorption of anions, has most of its sodium ions exchanged, significantly reducing soil salt content and harm to crops, making it suitable for agricultural use.

[0019] The preferred activated carbon content of agent A is 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, or 90%.

[0020] The preferred contents of H-103 macroporous resin are 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, and 90%.

[0021] The preferred contents of zeolite are 15%, 20%, 25%, 35%, and 40%.

[0022] The activated carbon mainly adsorbs chloride salts precipitated in the soil, such as sodium chloride, sodium hypochlorite, and sodium chlorate.

[0023] The H-103 macroporous resin mainly adsorbs free chloride ions in the soil, such as chloride ions free in water.

[0024] Zeolite possesses excellent ion exchange and adsorption capabilities. Due to its low particle density and high porosity, incorporating natural zeolite into soil can loosen the soil, increase its porosity and aeration, and improve soil properties. Zeolite's powerful adsorption, ion exchange, and buffering properties enable it to remediate and improve soil pollution. It selectively adsorbs ammonia, hydrogen sulfide, methane, carbon dioxide, hydrocarbons, phenol, exotoxins and endotoxins, heavy metals, radionuclides, and certain microorganisms, while simultaneously releasing essential trace elements for plants and enhancing soil fertility.

[0025] Because chloride ions in the soil can penetrate concrete, causing the steel bars inside the concrete to lose their passivation film protection, this is a prerequisite for the corrosion of steel bars in concrete. In addition, nitrate ions and sulfate ions will combine with hydrogen ions to form sulfuric acid and nitric acid, which will further corrode the concrete and the internal steel bars. Therefore, after the saline soil is improved by agent A1, the impact of anions in the soil on the external environment has been greatly reduced, and it has met the standards for industrial land.

[0026] The specific content of activated carbon and H-103 macroporous resin can be determined based on the actual humidity of the land. For example, in Dongying, Shandong, the Yellow River Delta is close to the Bohai Sea, and its soil has a high water content. Chloride ions in the soil are mostly in a free state, so the content of H-103 macroporous resin should be increased and the content of activated carbon should be decreased. On the other hand, Dongying City is far from the Bohai Sea, and the soil in the city center has a high salt content and low water content. The soil is compacted, and most of the salt in the soil precipitates out. Therefore, the content of activated carbon should be increased and the content of H-103 macroporous resin should be decreased.

[0027] The optimal ratio of 40% activated carbon, 40% H-103 macroporous resin, and 20% zeolite is suitable for most alkaline coastal saline soils.

[0028] Based on agent A, the preferred gypsum content in agent A2 is 15%, 20%, 25%, 30%, and 35%.

[0029] The preferred contents of ferrous sulfate are 10%, 15%, and 20%.

[0030] The preferred contents of calcium chloride are 10%, 15%, 20%, and 25%.

[0031] The calcium ions in gypsum and calcium chloride react with alkaline substances in the soil, reducing soil alkalinity and improving soil physicochemical properties. Gypsum, calcium chloride, and ferrous sulfate can further improve the soil pH, bringing it to a level suitable for crop cultivation.

[0032] In the agent B, the preferred content of quicklime is 15%, 20%, 25%, 30%, or 35%.

[0033] The preferred contents of quicklime are 25%, 30%, 35%, 40%, 45%, 50%, and 55%.

[0034] The preferred contents of activated alumina are 30%, 35%, 40%, 45%, 50%, 55%, 60%, and 65%.

[0035] The quicklime and slaked lime work together to adjust the pH of acidic saline soil, and the quicklime has a drying effect, making it suitable for soils with high water content near the sea.

[0036] Because quicklime reacts with water and releases a lot of heat, which is very harmful to the eyes, the amount of quicklime should be minimized.

[0037] Activated alumina is a porous, highly dispersed solid material with a large surface area and permeability. It can adsorb sulfate ions in the soil. When sulfate ions collide with the surface of activated alumina, they are attracted by unbalanced forces and remain on the surface, thus achieving the purpose of removal.

[0038] In the C agent, the preferred content of the cyanobacterial bacterial solution is 1%, 2.5%, 4%, or 5%.

[0039] The preferred content of dipotassium hydrogen phosphate is 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%.

[0040] The preferred content of calcium chloride is 0.1%, 0.3%, 0.5%, or 0.6%.

[0041] The preferred content of the ferric sulfate is 0.3%, 0.5%, or 0.8%.

[0042] The preferred content of potassium sulfate is 0.1%, 0.3%, 0.6%, 0.8%, or 1.0%.

[0043] The preferred content of sodium chloride is 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1.0%.

[0044] In this invention, the cyanobacteria are obtained by purchasing algae that grows profusely in the ponds of local fish farmers at low prices during the peak season of fish farming, and then separating the cyanobacteria from them using conventional methods; during the off-season of fish farming, the purchased algae are used to cultivate the cyanobacteria on their own using conventional methods, such as simulating the fish pond environment.

[0045] In this invention, the cyanobacterial bacterial solution refers to a mixture of cyanobacteria and water. For example, the 5% cyanobacterial bacterial solution in this invention refers to a product made by uniformly mixing 5% cyanobacteria with 95% water by mass.

[0046] Cyanobacteria have excellent salt tolerance and the ability to regulate osmotic pressure. On the one hand, cyanobacteria are typical prokaryotic cells containing nucleic acids and muramic acid in their cell walls, thus playing a role in regulating pH. On the other hand, the cell walls of cyanobacteria carry a large number of negative charges, which can adsorb sodium ions. Furthermore, cyanobacteria use nitrates and nitrites as raw materials, promoting the conversion of nitrates and nitrites in the soil through their physiological activities, increasing the nitrogen content in the soil, and improving soil fertility. Cyanobacteria can also enrich phosphorus, improving the utilization rate of phosphorus in the soil, increasing the phosphorus content in the soil, and further improving soil fertility. Dead cyanobacteria can serve as a nutrient source for crops and other organisms, increasing the organic matter content in the soil and promoting crop growth.

[0047] As for the solution of dipotassium hydrogen phosphate, calcium chloride, ferric sulfate, potassium sulfate, sodium chloride and water, it serves as the culture medium for cyanobacteria, ensuring that the cyanobacteria remain active during transportation.

[0048] Preferably, an algae growth substrate, which is a polyarylate mesh, can also be placed inside the C agent bottle.

[0049] The specific preparation method of the mineral conditioner provided by the present invention is as follows:

[0050] The preparation method of the A1 agent is as follows: activated carbon and H-103 macroporous resin are put into a pulverizer and pulverized into a mixed powder. The mixed powder is sieved and then mixed with zeolite in a mixer and stirred evenly. Finally, it is bottled to obtain the A1 agent.

[0051] The preparation method of the A2 agent is as follows: activated carbon, H-103 macroporous resin, gypsum, ferrous sulfate and calcium chloride are put into a pulverizer and pulverized into a mixed powder. The mixed powder is sieved and then mixed with zeolite in a mixer and stirred evenly. Finally, it is bottled to obtain the A2 agent.

[0052] Preferably, the above-mentioned pulverizer is a 90-mesh pulverizer, the above-mentioned sieve is an 80-mesh sieve, the above-mentioned mixer speed is 60 r / min, and the mixing time is 15 min.

[0053] The 90-mesh particle size is similar to that of ordinary flour. This particle size can ensure that Agent A is fully mixed with the soil to increase the contact area and improve the improvement efficiency. It can also ensure that the powder is blocked by the cilia in the nasal cavity when it enters the human body, thus ensuring the safety of technicians.

[0054] The preparation method of Agent B is as follows: quicklime, hydrated lime, and activated alumina are respectively put into a pulverizer and pulverized into powder, and then sieved. The sieved quicklime powder, hydrated lime powder, and activated alumina powder are respectively put into a dryer to dry. The dried quicklime powder, hydrated lime powder, and activated alumina powder are put into a mixer and stirred into a uniform mixed powder. The mixed powder is put into a dryer again to dry, and finally cooled and bottled to obtain Agent B.

[0055] Preferably, the pulverizer is a 90-mesh pulverizer, the sieve is an 80-mesh sieve, the first drying temperature of the dryer is 200℃ and the drying time is 1 hour, the speed of the mixer is 60 r / min and the mixing time is 15 minutes, and the second drying temperature of the dryer is 300℃ and the drying time is 1 hour.

[0056] Because quicklime reacts readily with water, the raw materials need to be crushed separately. Powdered quicklime increases the surface area in contact with air, making it highly susceptible to deterioration and requiring rapid drying. Before mixing the raw material powders evenly, the moisture contained in the slaked lime and activated alumina must also be removed to prevent the quicklime from reacting and deteriorating. After mixing the three raw materials evenly, the mixed powder needs to be dried again to maintain dryness during transportation, and then bottled quickly after cooling.

[0057] The preparation method of Agent C is as follows: calcium chloride solid, dipotassium hydrogen phosphate solid, ferric sulfate solid, potassium sulfate solid, and sodium chloride solid are placed in a mixer, and water is added while stirring. After all the solids are dissolved in the water, cyanobacterial bacterial solution is added, and finally the mixture is bottled to obtain Agent C.

[0058] Preferably, the mixer speed is 60 r / min.

[0059] The present invention has the following beneficial effects:

[0060] 1. Compared with traditional integrated conditioners, the conditioner of this invention can be divided into three agents: A, B, and C. These agents can be combined in pairs to work together, such as agent A + agent C or agent B + agent C. It should be noted that the combination of agent A + agent B cannot be applied to alkaline saline soils, as the quicklime and hydrated lime components in agent B will aggravate soil alkalization. However, the combination of agent A1 + agent B can be applied to acidic saline soils because agent A1 does not contain components that aggravate soil acidification. Instead, it will significantly absorb sulfate and nitrate ions from acidic soils, further improving the degree of soil acidification.

[0061] 2. The raw materials for this invention are simple to obtain, especially cyanobacteria, which allows fish farmers to purchase and reuse algae at low prices, turning waste into treasure and making it green and environmentally friendly; moreover, the preparation process is simple and low in cost.

[0062] 3. Compared with traditional conditioning agents, this invention has a wider range of applications. It can not only adjust alkaline coastal saline soil, but also acidic coastal saline soil. Different reagents can be selected according to different standards for industrial land and agricultural land, avoiding the waste of other components in the conditioning agent, making the best use of resources and saving resources.

[0063] 4. This invention eliminates the need for digging salt ditches, flushing salt, and washing salt, saving manpower, material resources, financial resources, and water resources. Detailed Implementation

[0064] The technical solutions in the embodiments of the invention are described clearly and completely below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] The conditioners in the following examples were prepared according to the following method.

[0066] According to the mass ratio, 40% activated carbon and 40% H-103 macroporous resin are put into a 90-mesh pulverizer and pulverized into a mixed powder. After passing through an 80-mesh sieve, the sieved mixed powder is put into a mixer with 20% zeolite at a speed of 60 r / min and stirred for 15 min. Finally, it is bottled to obtain agent A1.

[0067] According to the mass ratio, 15% activated carbon, 15% H-103 macroporous resin, 25% gypsum, 15% ferrous sulfate, and 10% calcium chloride are put into a 90-mesh pulverizer and pulverized into a mixed powder. The powder is then passed through an 80-mesh sieve. The sieved mixed powder is then put into a mixer with 20% zeolite at a speed of 60 r / min and stirred for 15 min. Finally, it is bottled to obtain agent A2.

[0068] According to the mass ratio, 25% quicklime, 55% hydrated lime, and 20% activated alumina are respectively put into a 90-mesh pulverizer and pulverized into powder, and then passed through an 80-mesh sieve. The sieved quicklime powder, hydrated lime powder, and activated alumina powder are respectively put into a dryer and dried at 200°C for 1 hour. The dried quicklime powder, hydrated lime powder, and activated alumina powder are then put into a mixer with a speed of 60 r / min and stirred for 15 minutes. The stirred mixed powder is then put into a dryer again and dried at 300°C for 1 hour. Finally, it is cooled and bottled to obtain Agent B.

[0069] The acquired algae were separated into cyanobacteria using conventional methods, and 5% of the cyanobacteria were mixed with 95% of the water by mass ratio to prepare a 5% cyanobacteria bacterial solution.

[0070] Mix 0.5% calcium chloride solid, 0.5% dipotassium hydrogen phosphate solid, 0.8% ferric sulfate solid, 0.8% potassium sulfate solid, and 0.9% sodium chloride solid in a mixer at a speed of 60 r / min with 91.5% water, then add 5% cyanobacterial bacterial solution, and finally bottle to obtain Agent C.

[0071] Coastal saline soil from the Dongying area of ​​the Yellow River Delta in Shandong Province was selected and divided into several plots for the following implementation example. Measurements showed that the original soil pH was 7.5, with sodium ions accounting for 45.8% of the total cations, chloride ions accounting for 41.2% of the total anions, sulfate ions accounting for 26.3%, and nitrate ions accounting for 21.7%.

[0072] Example 1

[0073] Apply agent A1 to field 1 and measure the content of various ions in the soil after 3 days.

[0074] Example 2

[0075] Apply agent A2 to field 2 and measure the content of various ions in the soil after 3 days.

[0076] Example 3

[0077] Apply agent C to field 3 and measure the content of various ions in the soil after 3 days.

[0078] Example 4

[0079] Apply agent A1 + agent C to field 4, and measure the content of each ion in the soil after 3 days.

[0080] Example 5

[0081] Apply agent A2 + agent C to field 4, and measure the content of various ions in the soil after 3 days.

[0082] Table 1. Field conditions for Examples 1-5

[0083]

[0084] As demonstrated in Examples 1-5, the individual effects of agents A1, A2, and C are limited, even inferior to existing soil conditioners, and fail to achieve the technical effect of improving soil geology. However, the combined use of different agents significantly enhances the effect. Therefore, it is not recommended to use any one of these agents alone. It should be noted that because the effect of agent A1 alone already meets the standards for industrial land, if the purpose of improving the geology is to construct buildings, agent A1 can be used alone to make the best use of resources and avoid waste.

[0085] The preferred embodiment is Example 5, namely the combination of agent A2 and agent C. While significantly reducing the proportion of nitrate and sodium ions in the soil, the sulfate ions from gypsum and ferrous sulfate in agent A2, and the chloride ions from calcium chloride, have virtually no impact on the soil. Compared to agent A1 + agent C, the sulfate and chloride ion content in the soil is only slightly increased, but the pH value and sodium ion content are significantly reduced. It is worth mentioning that because agent C contains live cyanobacteria, most of the nitrates in the soil are converted into readily available nitrogen for crops. Furthermore, the cyanobacteria can enrich phosphorus in the soil, further providing nutrients for crops, thus improving soil fertility while simultaneously improving the geological conditions.

[0086] Acidic coastal saline soil from the Zhanjiang area of ​​Guangzhou was selected and divided into several plots for the following implementation example. Measurements showed that the original soil pH was 4.7, with sulfate ions accounting for 42.3% of the total anions and nitrate ions accounting for 36.4%.

[0087] Example 6

[0088] Agent B was applied to field 6, and the content of various ions in the soil was measured after 6 days.

[0089] Example 7

[0090] Apply Agent C to field 7 and measure the content of various ions in the soil after 6 days.

[0091] Example 8

[0092] Apply agent A1 + agent B to field 8, and measure the content of various ions in the soil after 6 days.

[0093] Example 9

[0094] In field 9, agent B and agent C were applied. It should be noted that because quicklime reacts with the moisture in the soil and generates a lot of heat, which affects the physiological activity of cyanobacteria, in this set of examples, agent B was applied first and waited for 3 days, then agent C was applied and waited for 3 days before measuring the content of various ions in the soil. Therefore, examples 6-9 all waited for 6 days.

[0095]

[0096] As shown in Examples 6-9, using Agent C alone is insufficient to improve soil acidity because cyanobacteria cannot survive in acidic conditions, and those applied to acidic soil die quickly. While Agent B alone can significantly reduce sulfate ions in the soil, it cannot effectively reduce nitrate ions, and using Agent B alone can easily cause soil compaction. The combination of Agent A1 and Agent B significantly reduces both sulfate and nitrate ions in the soil. Furthermore, the combination of Agent B and Agent C, building upon Example 8, further reduces sulfate ions in the soil and significantly reduces nitrate ions, thus improving soil fertility.

[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mineral conditioner suitable for improving coastal saline soil, characterized in that, The mineral conditioning agent includes Agent A, Agent B, and Agent C; Agent A is an alkaline soil conditioner, Agent B is an acidic soil conditioner, and Agent C is a biological conditioner; The A agent, by mass ratio, comprises 10-90% activated carbon, 10-90% H-103 macroporous resin, and 15-40% zeolite; The B agent, by mass ratio, comprises 15-35% quicklime, 25-55% hydrated lime, and 30-65% activated alumina; The C agent, by mass ratio, comprises 1-5% cyanobacterial bacterial solution, 0.1-0.6% calcium chloride, 0.1-0.5% dipotassium hydrogen phosphate, 0.3-0.8% ferric sulfate, 0.1-1.0% potassium sulfate, 0.5-1.0% sodium chloride, and the remainder is water.

2. The mineral conditioner for improving coastal saline soil according to claim 1, characterized in that, The A agent, by mass ratio, also includes 15-35% gypsum, 10-20% ferrous sulfate, and 10-25% calcium chloride.

3. A mineral conditioner for improving coastal saline soils according to claim 1, characterized in that, The A agent, by mass ratio, comprises 40% activated carbon, 40% H-103 macroporous resin, and 20% zeolite.

4. A mineral conditioner suitable for improving coastal saline soil according to claim 2, characterized in that, The A agent, by mass ratio, comprises 15% activated carbon, 15% H-103 macroporous resin, 20% zeolite, 25% gypsum, 15% ferrous sulfate, and 10% calcium chloride.

5. A mineral conditioner for improving coastal saline soils according to claim 1, characterized in that, The B agent, by mass ratio, comprises 25% quicklime, 55% hydrated lime, and 20% activated alumina.

6. A mineral conditioner for improving coastal saline soils according to claim 1, characterized in that, The C agent, by mass ratio, comprises 5% cyanobacterial bacterial solution, 0.5% calcium chloride, 0.5% dipotassium hydrogen phosphate, 0.8% ferric sulfate, 0.8% potassium sulfate, 0.9% sodium chloride, and the remainder being water.

7. A method for preparing a mineral conditioner suitable for improving coastal saline soils according to any one of claims 1-6, characterized in that, The preparation method of Agent A is as follows: weigh the raw materials according to the weight percentage, put all the raw materials except zeolite into a pulverizer to pulverize them into mixed powder, sieve the mixed powder and put it into a mixer together with zeolite to stir evenly, and finally bottle it to obtain Agent A; The preparation method of Agent B is as follows: quicklime, hydrated lime, and activated alumina are respectively put into a pulverizer and pulverized into powder, then sieved, and then put into a dryer to dry. The dried quicklime powder, hydrated lime powder, and activated alumina powder are put into a mixer and stirred into a uniform mixed powder. The mixed powder is put into a dryer again to dry, and finally cooled and bottled to obtain Agent B. The preparation method of Agent C is as follows: calcium chloride solid, dipotassium hydrogen phosphate solid, ferric sulfate solid, potassium sulfate solid, and sodium chloride solid are placed in a mixer, and water is added while stirring. After all the solids are dissolved in the water, cyanobacterial bacterial solution is added, and finally the mixture is bottled to obtain Agent C.

8. A method for preparing a mineral conditioner suitable for improving coastal saline soil according to claim 7, characterized in that, In the preparation method of Agent A, the pulverizer is a 90-mesh pulverizer, the sieve is an 80-mesh sieve, the mixer speed is 60 r / min, and the mixing time is 15 min.

9. A method for preparing a mineral conditioner suitable for improving coastal saline soil according to claim 7, characterized in that, In the preparation method of Agent B, the pulverizer is a 90-mesh pulverizer, the sieve is an 80-mesh sieve, the first drying temperature of the dryer is 200℃ and the drying time is 1 hour, the stirring speed of the stirrer is 60 r / min and the stirring time is 15 minutes, and the second drying temperature of the dryer is 300℃ and the drying time is 1 hour.

10. A method for preparing a mineral conditioner suitable for improving coastal saline soil according to claim 7, characterized in that, In the preparation method of Agent C, the speed of the mixer is 60 r / min.

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