An anti-corrosion type liquid membrane and a planting method of climate intelligent agriculture in a semi-arid sandy area

Abstract

The application provides an anti-erosion liquid membrane and a planting method of semi-arid sandy area climate intelligent agriculture, and belongs to the technical field of desertification farmland management and desertification prevention and control. The anti-erosion liquid membrane is composed of humic acid, sodium alginate, carboxymethyl chitosan, polyethylene glycol, guar gum and water. The anti-erosion liquid membrane has good anti-erosion and soil conservation capacity, can promote soil to form granules, improve soil structure, has good film forming property and tensile strength, is easy to degrade, and will not pollute the environment. After the previous crop is harvested, the application is applied to fertilization, ridge building, sowing of grass seeds, spraying of the anti-erosion liquid membrane, and planting of crops according to soil moisture in spring. The method can improve the emergence rate and yield of crops in the sandy farmland, effectively cope with climate change, improve the soil organic matter content and soil porosity, increase the economic benefits while preventing wind and sand, achieve the purpose of improving the degraded sandy land, increasing carbon and fertilizing, and preventing and reducing disasters.

Description

Technical Field

[0001] This invention relates to the field of desertification control technology, and in particular to a corrosion-resistant liquid membrane and a planting method for intelligent agriculture in semi-arid and wind-blown sand areas. Background Technology

[0002] Wind erosion refers to the soil erosion process caused by the wind blowing or transporting loose materials on the earth's surface. Dry soil and relatively stable winds above the surface are the main conditions for severe wind erosion. Wind erosion is a major cause of the decline in productivity in desertified land. It not only damages soil structure and causes severe nutrient loss, but also has a significant impact on crop growth. The large area and wide distribution of desertification have seriously restricted and threatened the survival and development of people in desertified areas. Every year, a large amount of arable land in desertified areas suffers severe productivity decline due to wind erosion, resulting in serious economic losses and threatening food security.

[0003] Currently, methods for preventing wind erosion include physical, chemical, biological, and integrated desertification control methods. Physical methods involve constructing engineering projects to increase the resistance to windblown sand, promoting sand deposition; common methods include setting up high vertical sand barriers, fences, and retaining walls. Chemical methods utilize chemical materials and processes to create a consolidation layer on sand dunes or sandy surfaces prone to sand damage. This layer prevents wind erosion while retaining moisture and improving the properties of the sandy land, thus controlling and improving the environment for sand erosion. Biological methods involve sowing drought-resistant psammophytic plants to improve desertified land and control and stabilize shifting sand. Because psammophytic plants have extensive root systems that can bind sand particles, and the accumulation of organic matter from decomposing fallen leaves and branches promotes soil formation, altering the properties of the sandy land and making the shifting sand more stable. However, physical methods involve large engineering projects and are costly; chemical components can easily pollute the soil and cause the surface of desertified land to harden; as for biological sand fixation, due to the low rainfall and uneven distribution of rainfall in arid and semi-arid regions, as well as the dry and windy conditions in spring, the sand surface is unstable and lacks water. The seeds of sand-loving crops are small and are often buried by sand or blown away by the wind, resulting in low plant survival rates and poor ability to cope with agricultural natural disasters.

[0004] Liquid mulch is made by extracting natural polymer materials such as lignin, cellulose, and polysaccharides from agricultural waste straw, adding various trace elements and organic matter, and cross-linking and polymerizing them to form a high-molecular biopolymer. After being evenly diluted, it is atomized through nozzles and sprayed onto the ground surface to form a functional ecological film. Liquid mulch can promote soil aggregate formation, improve soil structure, consolidate sand particles, collect and retain water, conserve moisture, and promote plant growth. It can be used in deserts, farmland, sloping farmland, and wind-eroded areas. Patent application number "201510026651.2" discloses a biodegradable liquid agricultural mulch film, but its preparation process is complex, and the acrylic acid used is flammable, posing a threat to the environment and human health. Patent application number "201510171846.6" discloses a water-retaining and sand-fixing liquid mulch film, but the water glass used can cause soil compaction. Furthermore, some existing liquid mulch films on the market also have many problems, such as poor film-forming properties, low tensile strength, high permeability, and easy breakage on the soil surface. They are only suitable for crops on flat and sloping farmland, and not for use on grasslands and wastelands in arid and semi-arid regions. Previous liquid mulch film products were only used during the crop growing season, functioning similarly to traditional mulch films in terms of warming and moisture retention, but their effectiveness was generally short-lived and unsuitable for use during the "fallback period" after the autumn harvest in northern regions, failing to provide windbreak and soil stabilization. Especially with the current global climate change, there is an urgent need for "climate-smart" agricultural technologies that can solve wind erosion and desertification and adapt to climate change in ecologically fragile areas such as semi-arid and wind-blown sandy areas. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a corrosion-resistant liquid film and a planting method for intelligent agriculture in semi-arid and wind-blown sandy areas. This method solves the problems of corrosion-resistant liquid films being environmentally unfriendly, having poor film-forming properties, low tensile strength, and high moisture permeability. Consequently, it addresses the issue of low plant survival rates in semi-arid areas and ultimately achieves corrosion prevention, carbon enrichment, and fertilization of soil in wind-blown sandy areas.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] The present invention provides a corrosion-resistant liquid film comprising the following components in parts by weight: 80-120 parts of humic acid, 60-100 parts of sodium alginate, 30-50 parts of carboxymethyl chitosan, 10-15 parts of crosslinking agent, 8-12 parts of guar gum, and 120-150 parts of water; wherein the crosslinking agent is polyethylene glycol.

[0008] The present invention also provides a method for preparing the corrosion-resistant liquid film, comprising the following steps:

[0009] S1. Mix humic acid, sodium alginate, carboxymethyl chitosan, crosslinking agent, guar gum and water to obtain a mixed solution;

[0010] S2. The mixed solution is stirred at 45-65℃ for 2-4 hours to obtain the corrosion-resistant liquid film.

[0011] This invention also provides a planting method for smart agriculture in semi-arid, wind-blown sandy areas, comprising the following steps:

[0012] (1) After the previous crop is harvested in mid-to-late September, apply fertilizer and build ridges;

[0013] (2) After establishing the ridges, sow grass seeds; spray the aforementioned anti-corrosion liquid film after sowing;

[0014] (3) Soil moisture was measured from late April to early May. If the soil volume moisture content was ≥16%, the grass was cut, lightly rolled and compacted, and corn was planted. If the soil volume moisture content was <16%, the grass was not cut.

[0015] (4) If the grass is not cut from late April to early May, the soil moisture should be measured again in mid to late May. If the soil volume moisture content is ≥16%, the grass should be cut and peanuts or millet should be planted without tillage. If the soil volume moisture content is <16%, the grass should not be cut.

[0016] (5) If the grass is not cut in mid-to-late May, sunflowers can be sown without tillage after the grass seeds are harvested in late June to early July.

[0017] Preferably, the ridge specifications are as follows: ridge height 13-15cm, ridge bottom width 80-100cm, ridge surface width 50-70cm, and ridge furrow between two ridges with a furrow width of 80-100cm.

[0018] Preferably, the grass species include grass species from the Poaceae family and leguminous family, wherein the grass species include ryegrass and the leguminous species include white clover.

[0019] Preferably, the mass ratio of the grass species to the legume species is 2-3:1, and the sowing rate of the grass species is 1.2-1.5 kg / mu.

[0020] Preferably, the row spacing for sowing the grass seeds is 15-20 cm.

[0021] Preferably, the method of using the anti-corrosion liquid film is as follows: the anti-corrosion liquid film is mixed with water at a volume ratio of 1:3 to 6, and then sprayed, with a spraying amount of 20 to 30 kg / mu.

[0022] Preferably, the applied fertilizers include organic fertilizer and inorganic compound fertilizer, with the application rate of organic fertilizer being 300-500 kg / mu and the application rate of inorganic compound fertilizer being 20-30 kg / mu.

[0023] Preferably, the mass ratio of urea, potassium sulfate and calcium magnesium phosphate in the inorganic compound fertilizer is 8-12:5-10:3-6.

[0024] By adopting the above technical solution, the present invention has the following beneficial effects: The anti-corrosion liquid membrane of the present invention is composed of humic acid, sodium alginate, carboxymethyl chitosan, polyethylene glycol, guar gum, and water. The anti-corrosion liquid membrane of the present invention has good anti-corrosion and moisture retention capabilities, can promote soil aggregate formation, improve soil structure, and has good film-forming properties and tensile strength. It is also easily degradable and will not cause environmental pollution. After the previous crop is harvested, the present invention involves fertilization, ridging, sowing grass seeds, and then spraying the aforementioned anti-corrosion liquid membrane. Crops are then planted in the spring according to soil moisture conditions. This method can improve the survival rate and yield of crops in sandy degraded areas, while effectively increasing soil organic matter content and soil porosity. It can increase economic benefits while preventing wind erosion and sand fixation, achieving the purpose of improving sandy land degradation and increasing carbon dioxide and fertility. Detailed Implementation

[0025] The present invention provides a corrosion-resistant liquid film comprising the following components in parts by weight: 80-120 parts of humic acid, 60-100 parts of sodium alginate, 30-50 parts of carboxymethyl chitosan, 10-15 parts of crosslinking agent, 8-12 parts of guar gum, and 120-150 parts of water; wherein the crosslinking agent is polyethylene glycol.

[0026] In the anti-corrosion liquid film of the present invention, the mass fraction of humic acid is 80-120 parts, more preferably 90-110 parts, and even more preferably 100 parts;

[0027] The sodium alginate is present in a mass fraction of 60-100 parts, more preferably 70-90 parts, and even more preferably 80 parts;

[0028] The carboxymethyl chitosan is present in a mass fraction of 30-50 parts, more preferably 35-45 parts, and even more preferably 40 parts.

[0029] The crosslinking agent is 10 to 15 parts by mass, more preferably 11 to 14 parts, and more preferably 12 parts by mass.

[0030] The guar gum is present in 8 to 12 parts by weight, more preferably 9 to 11 parts, and even more preferably 10 parts by weight.

[0031] The water content is 120 to 150 parts by mass, more preferably 130 to 140 parts, and even more preferably 135 parts.

[0032] The humic acid, sodium alginate, carboxymethyl chitosan, and guar gum of this invention are cross-linked with a specific cross-linking agent to form a corrosion-resistant liquid membrane with good water retention capacity, which can promote soil aggregate formation, improve soil structure, and has good film-forming properties and tensile strength. At the same time, the raw material components used in the corrosion-resistant liquid membrane of this invention are mostly natural substances, which are easily degradable and environmentally friendly.

[0033] The present invention also provides a method for preparing the corrosion-resistant liquid film, comprising the following steps:

[0034] S1. Mix humic acid, sodium alginate, carboxymethyl chitosan, crosslinking agent, guar gum and water to obtain a mixed solution;

[0035] S2. The mixed solution is stirred at 45-65℃ for 2-4 hours to obtain the corrosion-resistant liquid film.

[0036] This invention involves pulverizing humic acid, sodium alginate, carboxymethyl chitosan, a crosslinking agent, and guar gum into powders and then mixing them. The fineness of the powders is 80-120 mesh, more preferably 90-110 mesh, and even more preferably 100 mesh. The pulverized powders are then mixed with water to obtain a mixed solution. The mixed solution is then crosslinked and polymerized under stirring conditions to obtain the corrosion-resistant liquid film. The reaction temperature is 45-65°C, more preferably 50-60°C, and even more preferably 55°C. The reaction time is 2-4 hours, more preferably 2.5-3.5 hours, and even more preferably 3 hours. This invention does not have a specific limitation on the stirring speed, as long as it can fully mix the raw materials. For example, it can be 80-100 rpm, more preferably 85-95 rpm, and even more preferably 90 rpm.

[0037] This invention also provides a planting method for smart agriculture in semi-arid, wind-blown sandy areas, comprising the following steps:

[0038] (1) After the previous crop is harvested in mid-to-late September, apply fertilizer and build ridges;

[0039] (2) After establishing the ridges, sow grass seeds; spray the aforementioned anti-corrosion liquid film after sowing;

[0040] (3) Soil moisture was measured from late April to early May. If the soil volume moisture content was ≥16%, the grass was cut, lightly rolled and compacted, and corn was planted. If the soil volume moisture content was <16%, the grass was not cut.

[0041] (4) If the grass is not cut from late April to early May, the soil moisture should be measured again in mid to late May. If the soil volume moisture content is ≥16%, the grass should be cut and peanuts or millet should be planted without tillage. If the soil volume moisture content is <16%, the grass should not be cut.

[0042] (5) If the grass is not cut in mid-to-late May, sunflowers can be sown without tillage after the grass seeds are harvested in late June to early July.

[0043] This invention involves fertilizing, land preparation, and ridging after the previous crop is harvested in mid-to-late September. The applied fertilizer includes organic and inorganic fertilizers. The amount of organic fertilizer applied is 300-500 kg / mu, more preferably 350-450 kg / mu, and even more preferably 400 kg / mu. The organic fertilizer can be composted organic fertilizer, well-rotted animal manure, or organic fertilizer purchased through commercial channels. This invention does not have any special limitations on the composting process; conventional raw materials and methods in the art can be used for composting. The amount of inorganic fertilizer applied is 20-30 kg / mu, more preferably 22-28 kg / mu, and even more preferably 25 kg / mu. The inorganic compound fertilizer includes urea, potassium sulfate, and calcium magnesium phosphate fertilizer. The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate fertilizer is 8-12:5-10:3-6, more preferably 9-11:7-9:4-5, and even more preferably 10:8:4.5.

[0044] This invention involves preparing the land and constructing ridges after fertilization. The ridge specifications are as follows: ridge height 13-15cm, ridge bottom width 80-100cm, ridge top width 50-70cm, and a furrow between ridges, with a furrow width of 80-100cm. In this invention, the ridge height is 13-15cm, more preferably 13.5-14.5cm, and even more preferably 13cm; the ridge bottom width is 80-100cm, more preferably 85-95cm, and even more preferably 90cm; the ridge top width is 50-70cm, more preferably 55-65cm, and even more preferably 60cm; and the furrow between ridges is 80-100cm wide, more preferably 85-95cm, and even more preferably 90cm. The purpose of setting up ridges in this invention is to create a wavy, undulating effect after planting, increasing resistance, reducing wind speed, and minimizing wind erosion. Furthermore, the specific ridge specifications of this invention achieve a good wind erosion resistance effect.

[0045] This invention involves sowing grass seeds after ridging, with sowing occurring on the ridge surface and in the furrows. After sowing, an anti-corrosion liquid film is sprayed. The grass seeds include gramineous grasses and leguminous grasses. The gramineous grasses have well-developed fibrous roots and germinate quickly, providing shade and moisture retention for other varieties. The leguminous grasses have deep root systems and can help stabilize sand. The gramineous grasses include ryegrass, and the leguminous grasses include white clover. The weight ratio of the gramineous grasses to the leguminous grasses is 2–3:1, more preferably 2.2–2.8:1, and more preferably 2.5:1. The sowing rate is 1.2–1.5 kg / mu, more preferably 1.3–1.4 kg / mu, and more preferably 1.35 kg / mu. The row spacing is 15–20 cm, more preferably 16–19 cm, and more preferably 18 cm.

[0046] This invention involves spraying an anti-corrosion liquid film after sowing grass seeds. The method of using the anti-corrosion liquid film is as follows: the anti-corrosion liquid film is mixed with water and then sprayed. The volume ratio of the anti-corrosion liquid film to water is 1:3 to 6, more preferably 1:4 to 5, and even more preferably 1:4.5. The spraying amount is 15 to 25 kg / mu, more preferably 17 to 22 kg / mu, and even more preferably 20 kg / mu.

[0047] In this invention, soil moisture is measured from late April to early May. If the soil volumetric moisture content is ≥16%, the grass is cut, lightly tilled, and then corn is planted. The tillage depth is 6-10 cm, more preferably 7-9 cm, and more preferably 8 cm. After tillage, corn is planted on the ridges and in the furrows. The row spacing for corn is 40-50 cm, more preferably 43-47 cm, and more preferably 45 cm. The plant spacing for corn is 25-30 cm, more preferably 27-29 cm, and more preferably 28 cm. If the soil volumetric moisture content is <16%, the grass is not cut.

[0048] If the grass is not cut from late April to early May, soil moisture should be measured again in mid-to-late May. If the soil volumetric moisture content is ≥16%, the grass should be cut, and peanuts or millet should be planted without tillage. The purpose of no-tillage is to reduce the direct impact of rainwater on the soil by covering the ground with stubble, reduce surface runoff and soil erosion, reduce surface evaporation, lower wind speed, and resist wind erosion. At the same time, no-tillage is also conducive to the biodiversity of insects and microorganisms in the soil and to the accumulation of soil organic matter. This invention does not have any special limitations on the planting of peanuts or millet; they can be planted at conventional densities. For example, the planting density of peanuts is 9,000 to 11,000 holes / mu, more preferably 9,500 to 10,500 holes / mu, and more preferably 10,000 holes / mu; the planting density of millet is 22,000 to 28,000 plants / mu, more preferably 24,000 to 26,000 plants / mu, and more preferably 25,000 plants / mu. If the soil volumetric moisture content is less than 16% in mid-to-late May, the grass should not be cut.

[0049] If the ryegrass is not cut in mid-to-late May, sunflowers can be sown without tillage after the ryegrass seeds are harvested in late June to early July. The planting density of sunflowers is 1800-2200 plants / acre, further preferably 1900-2100 plants / acre, and even more preferably 2000 plants / acre.

[0050] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0051] The organic fertilizer used in this embodiment of the invention was purchased from Xuzhou Fengrun Bio-organic Fertilizer Technology Development Co., Ltd. Unless otherwise specified, other raw materials or reagents can be purchased through conventional channels.

[0052] Example 1

[0053] 80 kg of humic acid, 60 kg of sodium alginate, 30 kg of carboxymethyl chitosan, 10 kg of polyethylene glycol, and 8 kg of guar gum were pulverized into powder with a fineness of 80 mesh, mixed with 120 kg of water, and stirred at 45°C and 80 rpm for 2 hours to obtain a corrosion-resistant liquid film.

[0054] Example 2

[0055] 100 kg of humic acid, 80 kg of sodium alginate, 40 kg of carboxymethyl chitosan, 12 kg of polyethylene glycol, and 10 kg of guar gum were pulverized into a powder with a fineness of 100 mesh and mixed with 135 kg of water. The mixture was stirred at 50°C and 90 rpm for 3 hours to obtain a corrosion-resistant liquid film.

[0056] Example 3

[0057] 120 kg of humic acid, 100 kg of sodium alginate, 50 kg of carboxymethyl chitosan, 15 kg of polyethylene glycol, and 12 kg of guar gum were pulverized into a powder with a fineness of 120 mesh and mixed with 150 kg of water. The mixture was stirred at 65°C and 100 rpm for 4 hours to obtain a corrosion-resistant liquid film.

[0058] Example 4

[0059] After the previous crop is harvested in mid-September, apply organic and inorganic fertilizers. The application rate of organic fertilizer is 300 kg / mu, and the application rate of inorganic fertilizer is 20 kg / mu. The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate in the inorganic compound fertilizer is 8:5:3. After fertilization, establish ridges with the following specifications: ridge height 13 cm, ridge bottom width 80 cm, ridge top width 50 cm, and furrows 80 cm wide between ridges. After establishing ridges, sow ryegrass and white clover. The seeding rate is 1.2 kg / mu, and the mass ratio of ryegrass to white clover seeds is 2:1. After sowing the seeds, spray with an anti-corrosion liquid film. The specific spraying method is as follows: mix the prepared anti-corrosion liquid film with water at a volume ratio of 1:3, and then spray. The spraying rate is 15 kg / mu.

[0060] In early May, soil moisture was measured, and the measured soil volumetric moisture content was 18%. Ryegrass and white clover were cut, and the soil was rotary tilled and compacted to a depth of 8 cm. Then, corn was planted with a row spacing of 45 cm and a plant spacing of 30 cm.

[0061] Example 5

[0062] After the previous crop is harvested in mid-September, apply organic and inorganic fertilizers. The application rate of organic fertilizer is 400 kg / mu, and the application rate of inorganic fertilizer is 25 kg / mu. The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate in the inorganic compound fertilizer is 10:8:4. After fertilization, establish ridges with the following specifications: ridge height 14 cm, ridge bottom width 90 cm, ridge top width 60 cm, and furrows between ridges, with a furrow width of 90 cm. After establishing the ridges, sow ryegrass and white clover. The seeding rate is 1.3 kg / mu, and the mass ratio of ryegrass to white clover seeds is 2.5:1. After sowing the grass seeds, spray with an anti-corrosion liquid film. The specific spraying method is as follows: mix the prepared anti-corrosion liquid film with water at a volume ratio of 1:4, and then spray. The spraying rate is 20 kg / mu.

[0063] Soil moisture was measured in late April, and the measured soil volumetric moisture content was 10%. Due to the low soil moisture, ryegrass and white clover were not cut for the time being. Soil moisture was measured again in late May, and the soil moisture content was 20%. At this time, the ryegrass and white clover were cut, and peanuts were planted using no-till planting, with a planting density of 10,000 holes per acre.

[0064] Example 6

[0065] After the previous crop is harvested in mid-September, apply organic and inorganic fertilizers. The application rate of organic fertilizer is 500 kg / mu, and the application rate of inorganic fertilizer is 30 kg / mu. The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate in the inorganic compound fertilizer is 12:10:6. After fertilization, establish ridges with the following specifications: ridge height 15 cm, ridge bottom width 100 cm, ridge top width 70 cm, and furrows 100 cm wide between ridges. After establishing ridges, sow ryegrass and white clover. The seeding rate is 1.5 kg / mu, and the mass ratio of ryegrass to white clover seeds is 3:1. After sowing the seeds, spray with an anti-corrosion liquid film. The specific spraying method is as follows: mix the prepared anti-corrosion liquid film with water at a volume ratio of 1:6, and then spray. The spraying rate is 25 kg / mu.

[0066] Soil moisture was measured in late April, with a volumetric water content of 10%. Due to the low soil moisture, ryegrass and white clover were not harvested at this time. Soil moisture was measured again in mid-May, with a water content of 14%, and harvesting was still not carried out. After the ryegrass matured in early July, the ryegrass seeds were harvested, and the ryegrass and white clover were harvested. Sunflowers were then planted using no-till methods at a planting density of 2000 plants per acre.

[0067] Comparative Example 1

[0068] Unlike Example 1, carboxymethyl chitosan was replaced with carboxymethyl cellulose, while the remaining components and preparation methods were the same as in Example 1.

[0069] Comparative Example 2

[0070] Unlike Example 1, guar gum was replaced with gum arabic, while the remaining components and preparation methods were the same as in Example 1.

[0071] Comparative Example 3

[0072] Unlike Example 1, the crosslinking agent was replaced with N,N-methylenebisacrylamide.

[0073] Comparative Example 4

[0074] Unlike Example 1, the crosslinking agent was replaced with epoxy silane.

[0075] Experiment Example 1 Mechanical Property Testing

[0076] The anti-corrosion liquid films prepared in Examples 1-3 and Comparative Examples 1-4 were cast onto a smooth, clean polyethylene plastic sheet surface. After drying under natural conditions for 12 hours, the films were peeled off, and the tensile strength of each group of films was measured. According to GB13022-91, dumbbell-shaped specimens were prepared with a specimen width of 20 mm and an initial gauge length of 60 mm. The test speed was 200 mm / min, and five parallel specimens were prepared each time. The average value was taken. The experimental results are shown in Table 1.

[0077] Table 1 Tensile strength of each group of corrosion-resistant liquid films

[0078] Group Tensile strength (MPa) Example 1 25.76 Example 2 25.43 Example 3 26.18 Comparative Example 1 18.57 Comparative Example 2 19.62 Comparative Example 3 19.04 Comparative Example 4 18.39

[0079] Tensile strength refers to the maximum tensile strength of a material under tensile loading. It is the material's resistance to tensile fracture stress and represents its tensile performance during stress. It is used to measure the tensile properties of a material. As shown in Table 1, the corrosion-resistant liquid films prepared in Examples 1-3 of this invention have good tensile properties, while the tensile properties decrease after changing the composition or crosslinking agent.

[0080] Experiment Example 2: Water Retention Performance Test

[0081] The water vapor transmission rate was tested using a water vapor transmission rate tester in accordance with GB / T 1037-2021. The mulch films from the above examples and comparative examples were cut into circular samples of equal area. Each sample, along with a permeation cup containing an appropriate amount of ultrapure water, was placed in a sample rack within the tester's sample chamber. The water vapor transmission rate of each sample was tested twice, and the average value was calculated. The test parameters were set as follows: temperature 35℃, relative humidity 90%, and wind speed 1.5 m / s. The results are shown in Table 2.

[0082] Table 2. Water vapor transmission rate of each group of corrosion-resistant liquid films.

[0083] Group <![CDATA[Water vapor transmission rate (g / m 2 ·24h)]]> Example 1 198.2 Example 2 201.4 Example 3 195.7 Comparative Example 1 254.1 Comparative Example 2 236.5 Comparative Example 3 241.7 Comparative Example 4 247.3

[0084] As shown in Table 2, the corrosion-resistant liquid membrane of this invention exhibits good moisture retention performance. This is because humic acid, sodium alginate, carboxymethyl chitosan, and guar gum form a three-dimensional network structure under the action of the crosslinking agent polyethylene glycol, which improves the water retention capacity of the corrosion-resistant liquid membrane. However, changing the raw material components or the type of crosslinking agent of the corrosion-resistant liquid membrane increases the water vapor permeability and reduces its water retention capacity.

[0085] Experimental Example 3

[0086] The experiment was conducted on September 20, 2020, in Baojiatun Town, Faku County, Liaoning Province. Three treatment groups were set up, each with a field length of 30m and a width of 20m. After the previous crop was harvested in mid-September, treatments 1-3 were fertilized with organic and inorganic fertilizers. The application rate of organic fertilizer was 300 kg / mu, and the application rate of inorganic fertilizer was 20 kg / mu. The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate in the inorganic compound fertilizer was 8:5:3. After fertilization, ridges were established in treatment 1. The ridge specifications were: ridge height 13cm, ridge bottom width 80cm, ridge top width 50cm, and a furrow between ridges, with a furrow width of 80cm. After ridge establishment, ryegrass and white clover were interspersed, with a seeding rate of 1.2 kg / mu and a seed mass ratio of ryegrass to white clover of 2:1. After sowing grass seeds, an anti-corrosion liquid film was sprayed. The specific spraying method was as follows: the prepared anti-corrosion liquid film was mixed with water at a volume ratio of 1:3, and then sprayed at a rate of 15 kg / mu. Treatment group 1 was sprayed with the anti-corrosion liquid film from Example 1; treatment group 2 did not establish ridges; other treatments were the same as treatment group 1; treatment group 3 neither established ridges nor was sprayed with the anti-corrosion liquid film. The average moisture content of the topsoil (0–20 cm) and soil wind erosion were monitored in each group, from the date of ridge establishment until two months after sowing.

[0087] Soil wind erosion was assessed using the dust collection bin method: sand collection boxes were buried in the field, with dimensions of length × width × depth (cm) = 33.5 × 22.5 × 11.5 (cm). After tillage, sowing, and liquid film spraying were completed, nine of these sand collection boxes were evenly buried in each group's field, for a total of 27 boxes. The sand inlet of each collection box was 10cm below the ground surface. Soil wind erosion monitoring required cleaning, sampling, bagging, and labeling of each of the 27 collection boxes in the field. Data processing was then performed, and the monitoring results are shown in Table 3.

[0088] Table 3 Soil moisture and soil erosion in each treatment group

[0089]

[0090] As shown in Table 3, the method of ridging and spraying with anti-corrosion liquid film of the present invention can effectively reduce soil wind erosion and water loss. Ridging allows natural rainfall to be stored, reducing soil erosion and loss of soil nutrients. The anti-corrosion liquid film can prevent erosion and retain moisture, which can alleviate and improve the growth environment of ryegrass and white clover.

[0091] Soil moisture was measured in late April. The soil volumetric moisture content of treatments 1-5 was 18%, 17%, 19%, 13%, and 12%, respectively. Due to the poor soil moisture in treatments 4 and 5, no harvesting was carried out in any of these groups. Soil moisture was measured again in mid-May. The soil volumetric moisture content of treatments 1-3 was all >16%, therefore peanuts were planted according to the planting method in Example 5. Half a month after planting, the survival rate and yield of peanuts were counted. After peanut harvest, soil bulk density, soil porosity, and organic matter content were statistically analyzed, and the results are shown in Table 4.

[0092] Table 4. Survival rate, yield, and soil assessment of peanuts in each group.

[0093]

[0094] Organic matter is an important condition for the formation of soil aggregates. If the soil forms a large number of aggregates, there will be multi-level voids of varying sizes, resulting in a loose and porous interior and increased soil porosity. As shown in Table 4, the planting method of the present invention for intelligent agriculture in semi-arid and wind-blown sandy areas can effectively achieve erosion prevention, carbon enrichment, and fertilization. It can effectively increase soil organic matter content and soil porosity, and improve the survival rate and yield of crops in sandy degraded areas. While preventing wind erosion and fixing sand, it can also increase economic benefits and improve sandy land degradation and carbon enrichment in the long term.

[0095] As can be seen from the above embodiments, the anti-corrosion liquid film of the present invention has good anti-corrosion and moisture retention capabilities, can promote soil aggregate formation, improve soil structure, and has good film-forming properties and tensile strength. The planting method of the present invention for intelligent agriculture in semi-arid and wind-blown sandy areas can improve the survival rate and yield of crops in sandy land degradation areas, and can effectively increase soil organic matter content and soil porosity. While preventing wind erosion and fixing sand, it can also increase economic benefits and improve sandy land degradation and increase carbon and fertility in the long term.

[0096] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A corrosion-resistant liquid film, characterized in that, The product comprises the following components in parts by weight: 80-120 parts humic acid, 60-100 parts sodium alginate, 30-50 parts carboxymethyl chitosan, 10-15 parts crosslinking agent, 8-12 parts guar gum, and 120-150 parts water; wherein the crosslinking agent is polyethylene glycol.

2. The method for preparing the anti-corrosion liquid film according to claim 1, characterized in that, Includes the following steps: S1. Mix humic acid, sodium alginate, carboxymethyl chitosan, crosslinking agent, guar gum and water to obtain a mixed solution; S2. The mixed solution is stirred at 45-65℃ for 2-4 hours to obtain the corrosion-resistant liquid film.

3. A planting method for intelligent agriculture in semi-arid, wind-blown sandy areas, characterized in that... Includes the following steps: (1) After the previous crop is harvested in mid-to-late September, apply fertilizer and build ridges; (2) After establishing the ridges, sow grass seeds; after sowing, spray the anti-corrosion liquid film as described in claim 1; (3) Soil moisture was measured from late April to early May. If the soil volume moisture content was ≥16%, the grass was cut, lightly rolled and compacted, and corn was planted. If the soil volume moisture content was <16%, the grass was not cut. (4) If the grass is not cut from late April to early May, the soil moisture should be measured again in mid to late May. If the soil volume moisture content is ≥16%, the grass should be cut and peanuts or millet should be planted without tillage. If the soil volume moisture content is <16%, the grass should not be cut. (5) If the grass is not cut in mid-to-late May, sunflowers can be sown without tillage after the grass seeds are harvested in late June to early July.

4. The planting method according to claim 3, characterized in that, The specifications for the ridges are as follows: ridge height 13-15cm, ridge bottom width 80-100cm, ridge surface width 50-70cm, and ridge furrows between ridges, with furrow width 80-100cm.

5. The planting method according to claim 3, characterized in that, The grass species include grass species from the Poaceae family and legume species from the Fabaceae family. The grass species from the Poaceae family include ryegrass, and the legume species from the Fabaceae family include white clover.

6. The planting method according to claim 5, characterized in that, The mass ratio of grass species to leguminous grass species is 2-3:1, and the sowing rate of the grass species is 1.2-1.5 kg / mu.

7. The planting method according to claim 6, characterized in that, The sowing row spacing for the grass seeds is 15–20 cm.

8. The planting method according to claim 3, characterized in that, The method of using the anti-corrosion liquid film is as follows: mix the anti-corrosion liquid film with water at a volume ratio of 1:3 to 6, and then spray it at a rate of 20 to 30 kg / mu.

9. The planting method according to claim 3, characterized in that, The applied fertilizers include organic fertilizer and inorganic compound fertilizer. The application rate of organic fertilizer is 300-500 kg / mu, and the application rate of inorganic compound fertilizer is 20-30 kg / mu.

10. The planting method according to claim 9, characterized in that, The mass ratio of urea, potassium sulfate, and calcium magnesium phosphate in the inorganic compound fertilizer is 8-12:5-10:3-6.

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