Corrosion-resistant liquid film and planting method for climate intelligent agriculture in semi-arid windy and sandy area

Abstract

The invention provides an anti-corrosion liquid film and a planting method for climate intelligent agriculture in a semi-arid windy desert area, and belongs to the technical field of desertification cultivated land control and desertification control. The anti-corrosion liquid film is prepared from humic acid, sodium alginate, carboxymethyl chitosan, polyethylene glycol, guar gum and water. The anti-corrosion liquid film has good anti-corrosion and soil moisture preservation capacity, can promote soil to form aggregates and improve the soil structure, has good film forming performance and tensile strength, is easy to degrade and does not cause pollution to the environment. After previous crops are harvested, fertilization, ridging and grass seed sowing are carried out, then the anti-corrosion liquid film is sprayed, and the crops are planted in spring according to the soil moisture content. By means of the method, the emergence rate and yield of desertification farmland crops can be increased, meanwhile, climate environment changes are effectively coped, the soil organic matter content and the soil porosity are increased, economic benefits can be increased while wind prevention and sand fixation are achieved, and the purposes of improving desertification degradation, recarburizing, fertilizing and disaster prevention and reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of desertification prevention and control, and in particular to an anti-corrosion liquid film and a planting method of climate-smart agriculture in semi-arid sandy areas. Background Art

[0002] Wind erosion refers to the soil erosion process in which loose surface materials are blown or transported by the wind. Dry soil and relatively stable wind above the surface are the main conditions for severe wind erosion. Wind erosion is the main cause of the decline in productivity of desertified land. Wind erosion not only leads to the destruction of soil structure and serious loss of nutrients, but also has a huge impact on the growth of crops. The large area and wide distribution of desertification have seriously restricted and threatened the survival and development of people in the sandy areas. Every year, a large amount of cultivated land in the desertified land area has a serious decline in productivity due to wind erosion, causing serious economic losses and posing a threat to food security.

[0003] At present, methods for preventing and controlling wind erosion include physical, chemical, biological and comprehensive sand control methods. The physical method is to build projects to increase the movement resistance of wind and sand flow and promote the deposition of sand particles; common methods include setting up high vertical sand barriers, fences, sand retaining walls, etc. The chemical method is to use chemical materials and processes to build a consolidation layer on sand dunes or sandy surfaces that are prone to sand damage, which can prevent wind from blowing and retain moisture and improve the properties of sand, so as to control and improve the sand damage environment. The biological method is to improve desertified land, control and fix quicksand by sowing some drought-resistant sand plants. Because sand plants have developed root systems that can consolidate sand particles, and the accumulation of organic matter after the decay of dead branches and fallen leaves promotes the soil formation of sand, changes the properties of sand, and makes quicksand tend to be fixed. However, physical methods require large amounts of engineering work and are relatively costly; chemical components can easily pollute the soil and cause compaction on the surface of desertified land; in terms of biological sand fixation, due to the low rainfall and uneven rainfall distribution in arid and semi-arid areas, spring droughts with little rain and high winds lead to problems such as unstable sand surface and water shortages. The seeds of sand-growing crops are small and are often buried in the 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 crop waste straw, adding a variety of trace elements and organic matter, and cross-linking and polymerizing to form high-molecular biopolymers. After uniform dilution, it is atomized by a nozzle and sprayed on the surface to form a functional ecological film on the soil surface. Liquid mulch can promote the formation of soil aggregates, improve soil structure, consolidate sand, collect water, retain moisture, and promote plant growth. It can be used in deserts, farmlands, sloping farmland, and wind erosion areas. The invention patent with application number "201510026651.2" discloses a biodegradable agricultural liquid mulch film, but the preparation process is complicated, and the acrylic acid used is flammable, which is harmful to the environment and human health; the invention patent with application number "201510171846.6" discloses a water-retaining and sand-fixing liquid mulch film, but the water glass used in it will cause soil compaction; in addition, some of the existing liquid mulch films on the market also have many problems, such as poor film-forming properties, poor tensile strength, high moisture permeability, easy damage on the soil surface, and are only suitable for use on crops on flat land and sloping cultivated land, and are not suitable for use on grasslands and wastelands in arid and semi-arid areas. In the past, liquid mulch film products were only used in the crop growing season, playing a role similar to mulch films, playing a role in warming and retaining moisture, but the effectiveness is generally short, and it is not suitable for use in the "leisure period" after the autumn harvest of crops in the north, and it does not play a role in windbreak and soil fixation. 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 sandy areas. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an anti-corrosion liquid membrane and a planting method for climate-smart agriculture in semi-arid sandy areas, which solves the problems of the anti-corrosion liquid membrane being environmentally unfriendly, having poor film-forming properties, poor tensile strength, and high moisture permeability, and further solves the problem of low plant survival rate in semi-arid areas, and ultimately achieves soil anti-corrosion, carbon enhancement, and fertilization in sandy areas.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

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

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

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

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

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

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

[0013] (2) after ridge building, sowing grass seeds; after sowing, spraying the anti-corrosion liquid film;

[0014] (3) Measure soil moisture from late April to early May. If the soil moisture content is ≥16%, mow the grass, press it down with shallow rotation, and plant corn. If the soil moisture content is <16%, do not mow.

[0015] (4) If the grass is not cut in late April to early May, continue to measure the soil moisture in mid-to-late May. If the soil volume moisture content is ≥16%, cut the grass and plant peanuts or millet without tillage; if the soil volume moisture content is <16%, do not cut the grass;

[0016] (5) If the grass is not mowed in mid-to-late May, wait until late June to early July when the grass seeds are ripe and harvested, and then sow sunflowers in a no-till manner.

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

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

[0019] Preferably, the mass ratio of the grass seeds of the Poaceae family to the grass seeds of the Leguminosae family is 2 to 3:1, and the sowing amount of the grass seeds is 1.2 to 1.5 kg / mu.

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

[0021] Preferably, the method for using the anti-corrosion liquid film is: after mixing the anti-corrosion liquid film with water in a volume ratio of 1:3-6, spraying the mixture, with a spraying amount of 20-30 kg / mu.

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

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

[0024] By adopting the above technical scheme, the present invention has the following beneficial effects: the anti-corrosion liquid film of the present invention is composed of humic acid, sodium alginate, carboxymethyl chitosan, polyethylene glycol, guar gum and water. The anti-corrosion liquid film of the present invention has good anti-corrosion and moisture retention capabilities, can promote soil to form aggregates, improve soil structure, and has good film-forming properties and tensile strength. At the same time, it is easy to degrade and will not pollute the environment. After the previous crop is harvested, the present invention applies fertilizers, builds ridges, sows grass seeds, and then sprays the anti-corrosion liquid film, and plants crops in spring according to the soil moisture conditions. This method can improve the survival rate and yield of crops in sandy land degradation areas, while effectively improving the soil organic matter content and soil porosity, and can increase economic benefits while preventing wind and fixing sand, thereby achieving the purpose of improving sandy land degradation and increasing carbon and fertilizing. DETAILED DESCRIPTION

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

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

[0027] The mass fraction of the sodium alginate is 60 to 100 parts, more preferably 70 to 90 parts, and more preferably 80 parts;

[0028] The mass fraction of the carboxymethyl chitosan is 30 to 50 parts, more preferably 35 to 45 parts, and more preferably 40 parts;

[0029] The mass fraction of the cross-linking agent is 10 to 15 parts, more preferably 11 to 14 parts, and more preferably 12 parts;

[0030] The mass fraction of the guar gum is 8 to 12 parts, more preferably 9 to 11 parts, and more preferably 10 parts;

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

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

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

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

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

[0036] The present invention grinds humic acid, sodium alginate, carboxymethyl chitosan, a crosslinking agent and guar gum into powders and then mixes them, wherein the fineness of the powders is 80-120 meshes, more preferably 90-110 meshes, and more preferably 100 meshes; the grinded powders are mixed with water to obtain a mixed solution; then the mixed solution is crosslinked and polymerized under stirring conditions to obtain the anti-corrosion liquid film; the reaction temperature is 45-65°C, more preferably 50-60°C, and more preferably 55°C; the reaction time is 2-4h, more preferably 2.5-3.5h, and more preferably 3h; the present invention has no special limitation on the stirring speed, as long as the raw materials can be fully mixed, for example, it can be 80-100rpm, more preferably 85-95rpm, and more preferably 90rpm.

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

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

[0039] (2) after ridge building, sowing grass seeds; after sowing, spraying the anti-corrosion liquid film;

[0040] (3) Measure soil moisture from late April to early May. If the soil moisture content is ≥16%, mow the grass, press it down with shallow rotation, and plant corn. If the soil moisture content is <16%, do not mow.

[0041] (4) If the grass is not cut in late April to early May, continue to measure the soil moisture in mid-to-late May. If the soil volume moisture content is ≥16%, cut the grass and plant peanuts or millet without tillage; if the soil volume moisture content is <16%, do not cut the grass;

[0042] (5) If the grass is not mowed in mid-to-late May, wait until late June to early July when the grass seeds are ripe and harvested, and then sow sunflowers in a no-till manner.

[0043] The present invention applies fertilizer, prepares the land and builds ridges after the previous crop is harvested in mid-to-late September; the applied fertilizers include organic fertilizers and inorganic fertilizers, and the application amount of the organic fertilizer is 300-500 kg / mu, more preferably 350-450 kg / mu, and more preferably 400 kg / mu; the organic fertilizer can be organic fertilizer prepared by composting, or it can be decomposed animal manure, or it can be organic fertilizer purchased through commercial channels; the present invention has no special restrictions on the composting process, and the composting can be carried out using conventional raw materials and methods in the field. The application amount of the inorganic fertilizer is 20-30 kg / mu, more preferably 22-28 kg / mu, and more preferably 25 kg / mu; the inorganic compound fertilizer includes urea, potassium sulfate and calcium magnesium phosphate, and the mass ratio of urea, potassium sulfate and calcium magnesium phosphate is 8-12:5-10:3-6, more preferably 9-11:7-9:4-5, and more preferably 10:8:4.5.

[0044] The present invention prepares the land after fertilization and builds ridges; the ridge body specifications are as follows: ridge height 13-15cm, ridge bottom width 80-100cm, ridge surface width 50-70cm, ridge ditch between two ridges, ridge ditch width 80-100cm. In the present invention, the height of the ridge body is 13-15cm, more preferably 13.5-14.5cm, more preferably 13cm; the width of the ridge bottom is 80-100cm, more preferably 85-95cm, more preferably 90cm; the ridge surface width is 50-70cm, more preferably 55-65cm, more preferably 60cm; the ridge ditch between two ridges, ridge ditch width 80-100cm, more preferably 85-95cm, more preferably 90cm. The purpose of setting the ridges in the present invention is that after planting plants, they are wavy, which increases resistance, can reduce wind speed, and reduce wind erosion. And under the specific ridge body specifications of the present invention, a good anti-wind erosion effect is achieved.

[0045] The present invention sows grass seeds after building ridges, and the sowing is carried out on the ridge surface and the furrow. After sowing, the anti-corrosion liquid film is sprayed; the grass seeds include grass seeds of the Gramineae family and grass seeds of the Leguminosae family. Grass seeds of the Gramineae family have well-developed fibrous roots and fast emergence, and can provide shade and moisture conservation for other varieties; Leguminous grass seeds have deep roots and can play a role in sand fixation. The Gramineae family grass seeds include ryegrass, and the Leguminous family grass seeds include white clover. The weight ratio of the Gramineae family grass seeds to the Leguminous family grass seeds is 2 to 3:1, more preferably 2.2 to 2.8:1, and more preferably 2.5:1; the sowing amount of the grass seeds is 1.2 to 1.5 kg / mu, more preferably 1.3 to 1.4 kg / mu, and more preferably 1.35 kg / mu. The sowing row spacing of the grass seeds is 15 to 20 cm, more preferably 16 to 19 cm, and more preferably 18 cm.

[0046] The present invention sprays an anti-corrosion liquid film after sowing grass seeds. The method for 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 1:3-6, more preferably 1:4-5, and more preferably 1:4.5. The spraying amount is 15-25 kg / mu, more preferably 17-22 kg / mu, and more preferably 20 kg / mu.

[0047] The present invention measures soil moisture from late April to early May. If the soil volume moisture content is greater than or equal to 16%, grass is mowed, shallow rotary compaction is performed, and corn is planted; the rotary tillage depth is 6 to 10 cm, more preferably 7 to 9 cm, and more preferably 8 cm; corn is planted after rotary tillage, and the corn is planted on ridge surfaces and ridge furrows, and the row spacing of corn planting is 40 to 50 cm, more preferably 43 to 47 cm, and more preferably 45 cm; the plant spacing of corn planting is 25 to 30 cm, more preferably 27 to 29 cm, and more preferably 28 cm; if the soil volume moisture content is less than 16%, no mowing is performed.

[0048] If the grass is not mowed from late April to early May, the soil moisture is continuously measured in mid-to-late May. If the soil volume moisture content is ≥16%, the grass is mowed and peanuts or millet are planted without tillage. The purpose of no-tillage is that the ground stubble covering can reduce the direct impact of rain on the soil, reduce surface runoff and soil erosion, reduce ground evaporation, reduce wind speed, and resist wind erosion. At the same time, no-tillage is also beneficial to the biodiversity of insects and microorganisms in the soil, and is beneficial to the accumulation of soil organic matter. The present invention has no special limitation on the planting of peanuts or millet, and can be planted according to conventional density. For example, the planting density of peanuts is 9000-11000 holes / mu, more preferably 9500-10500 holes / mu, and more preferably 10000 holes / mu; the planting density of millet is 22,000-28,000 plants / mu, more preferably 24,000-26,000 plants / mu, and more preferably 25,000 plants / mu. If the soil volume moisture content is less than 16% in mid-to-late May, do not mow the grass.

[0049] If the grass is not mowed in mid-to-late May, wait until late June to early July, when the ryegrass grains are mature and harvested, and then sow sunflowers without tillage. The planting density of sunflowers is 1800 to 2200 plants / mu, more preferably 1900 to 2100 plants / mu, and more preferably 2000 plants / mu.

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

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

[0052] Example 1

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

[0054] Example 2

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

[0056] Example 3

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

[0058] Example 4

[0059] After the previous crop was harvested in mid-September, organic and inorganic fertilizers were applied. The amount of organic fertilizer applied was 300kg / mu, and the amount of inorganic fertilizer applied was 20kg / mu. The mass ratio of urea, potassium sulfate and calcium magnesium phosphate fertilizer in the inorganic compound fertilizer was 8:5:3. After fertilization, ridges were built. The specifications of the ridge body were: ridge height 13cm, ridge bottom width 80cm, ridge surface width 50cm, and ridge furrows between the two ridges, with a ridge furrow width of 80cm. After ridge building, ryegrass and white clover were mixed, and the sowing amount of grass seeds was 1.2kg / mu, and the mass ratio of ryegrass and white clover seeds was 2:1. After sowing grass seeds, anti-corrosion liquid film was sprayed. The specific spraying method was: the prepared anti-corrosion liquid film was mixed with water in a volume ratio of 1:3, and sprayed after mixing. The spraying amount was 15kg / mu.

[0060] The soil moisture content was measured in early May, and the measured soil volume moisture content was 18%. The ryegrass and white clover were mowed and rotary tilled 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 was harvested in mid-September, organic and inorganic fertilizers were applied. The amount of organic fertilizer applied was 400kg / mu, and the amount of inorganic fertilizer applied was 25kg / mu. The mass ratio of urea, potassium sulfate and calcium magnesium phosphate fertilizer in the inorganic compound fertilizer was 10:8:4. After fertilization, ridges were built. The specifications of the ridge body were: ridge height 14cm, ridge bottom width 90cm, ridge surface width 60cm, and ridge furrows between the two ridges, with a ridge furrow width of 90cm. After ridge building, ryegrass and white clover were mixed, and the sowing amount of grass seeds was 1.3kg / mu, and the mass ratio of ryegrass and white clover seeds was 2.5:1. After sowing grass seeds, anti-corrosion liquid film was sprayed. The specific spraying method was: the prepared anti-corrosion liquid film was mixed with water in a volume ratio of 1:4, and sprayed after mixing, and the spraying amount was 20kg / mu.

[0063] In late April, the soil moisture was measured, and the measured soil volume moisture content was 10%. Because the soil moisture was low, ryegrass and white clover were not cut temporarily. In late May, the soil moisture was measured again, and the soil moisture content was 20%. At this time, ryegrass and white clover were cut, and peanuts were planted without tillage. The planting density of peanuts was 10,000 holes / mu.

[0064] Example 6

[0065] After the previous crop was harvested in mid-September, organic and inorganic fertilizers were applied. The amount of organic fertilizer applied was 500kg / mu, the amount of inorganic fertilizer applied was 30kg / mu, and the mass ratio of urea, potassium sulfate and calcium magnesium phosphate fertilizer in the inorganic compound fertilizer was 12:10:6. After fertilization, ridges were built. The specifications of the ridge body were: ridge height 15cm, ridge bottom width 100cm, ridge surface width 70cm, and ridge furrows between the two ridges, with a ridge furrow width of 100cm. After ridge building, ryegrass and white clover were mixed, the sowing amount of grass seeds was 1.5kg / mu, and the mass ratio of ryegrass and white clover seeds was 3:1. After sowing grass seeds, anti-corrosion liquid film was sprayed. The specific spraying method was: the prepared anti-corrosion liquid film was mixed with water in a volume ratio of 1:6, and sprayed after mixing, and the spraying amount was 25kg / mu.

[0066] In late April, the soil moisture content was measured, and the measured soil volume moisture content was 10%. Because the soil moisture content was low, ryegrass and white clover were not cut temporarily. In mid-May, the soil moisture content was measured again, and the soil moisture content was 14%, so no cutting was performed. After the ryegrass matured in early July, the ryegrass seeds were harvested, the ryegrass and white clover were cut, and sunflowers were planted without tillage. The planting density of sunflowers was 2,000 plants / mu.

[0067] Comparative Example 1

[0068] The difference from Example 1 is that carboxymethyl chitosan is replaced by carboxymethyl cellulose, and the remaining components and preparation method are the same as those of Example 1.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that guar gum is replaced by gum arabic, and the remaining components and preparation method are the same as those of Example 1.

[0071] Comparative Example 3

[0072] The difference from Example 1 is that the cross-linking agent is replaced by N,N-methylenebisacrylamide.

[0073] Comparative Example 4

[0074] The difference from Example 1 is that the crosslinking agent is replaced by epoxy silane.

[0075] Experimental Example 1 Mechanical Properties Test

[0076] The anti-corrosion liquid films prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were cast on the surface of a smooth and clean polyethylene plastic plate, and the films were removed after drying for 12 hours under natural conditions, and the tensile strength of each group of ground films was measured. According to GB13022-91, dumbbell-shaped specimens were made, the specimen width was 20 mm, the original gauge length was 60 mm, the test speed was 200 mm / min, 5 parallel specimens were made each time, and the average value was taken. The experimental results are shown in Table 1.

[0077] Table 1 Tensile strength of each group of anti-corrosion 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 resistance of a material under tensile fracture stress, indicating the tensile performance of a material during stress, and is used to measure the tensile performance of a material. As shown in Table 1, the anti-corrosion liquid films prepared in Examples 1 to 3 of the present invention have good tensile performance, while the tensile performance decreases after changing the components or cross-linking agent.

[0080] Experimental Example 2 Water Retention Performance Test

[0081] Refer to GB / T 1037-2021 and use a water vapor transmission rate tester for testing. Cut the mulch films of the above embodiments and comparative examples into circular samples of the same area, put the samples together with a permeable cup filled with an appropriate amount of ultrapure water into the sample rack, and place them in the sample chamber of the tester to test the water vapor transmission rate of each sample. Each sample was tested twice and the average value was calculated. The test parameters were set as follows: temperature of 35°C, relative humidity of 90%, wind speed of 1.5m / s, and the test results are shown in Table 2.

[0082] Table 2 Water vapor transmission rate of each group of anti-corrosion 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 can be seen from Table 2, the anti-corrosion liquid film of the embodiment of the present invention has good moisture retention performance, which is because humic acid, sodium alginate, carboxymethyl chitosan, and guar gum form a three-dimensional network structure under the action of the cross-linking agent polyethylene glycol, thereby improving the water and moisture retention capacity of the anti-corrosion liquid film. However, by changing the raw material components of the anti-corrosion liquid film or the type of the cross-linking agent, the water vapor permeability of the anti-corrosion liquid film increases, and the water and moisture retention capacity decreases.

[0085] Experimental Example 3

[0086] The experiment was conducted in Baojiatun Town, Faku County, Liaoning Province on September 20, 2020. Three treatment groups were set up, each with a plot length of 30m and a width of 20m. After the previous crop was harvested in mid-September, treatment groups 1 to 3 applied organic and inorganic fertilizers. The application amount of organic fertilizer was 300kg / mu, and the application amount of inorganic fertilizer was 20kg / mu. The mass ratio of urea, potassium sulfate and calcium magnesium phosphate fertilizer in the inorganic compound fertilizer was 8:5:3. After fertilization, treatment 1 built ridges, and the ridge body specifications were: ridge height 13cm, ridge bottom width 80cm, ridge surface width 50cm, ridge ditch between the two ridges, and ridge ditch width 80cm. After ridge construction, ryegrass and white clover were mixed, the sowing amount of grass seeds was 1.2kg / mu, and the mass ratio of ryegrass and white clover seeds was 2:1. After sowing grass seeds, spray the anti-corrosion liquid film. The specific spraying method is: mix the prepared anti-corrosion liquid film with water in a volume ratio of 1:3, spray after mixing, and the spraying amount is 15kg / mu. Among them, treatment group 1 sprays the anti-corrosion liquid film of Example 1, treatment group 2 does not build ridges, and other treatments are the same as treatment group 1; treatment group 3 neither builds ridges nor sprays the anti-corrosion liquid film. Each group monitors the average moisture content of the surface soil (0-20cm) and the amount of soil wind erosion, and the monitoring period starts from the day of ridge formation and ends two months after sowing.

[0087] The amount of soil wind erosion was measured using the dust suppression cylinder method: a sand collection box was buried in the field, and the size of the sand collection box was: length × width × depth (cm) = 33.5 × 22.5 × 11.5 (cm). After the tillage, sowing and spraying of liquid film were completed, 9 of the above sand collection boxes were evenly buried in the field of each group, for a total of 27. The sand inlet of the sand collection box was 10 cm above the ground. The monitoring of soil wind erosion required cleaning, sampling, bagging, marking of the 27 sand collection boxes in the field one by one, and finally data processing. The monitoring results are shown in Table 3.

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

[0089]

[0090] It can be seen from Table 3 that the method of ridge building + spraying anti-corrosion liquid film of the present invention can effectively reduce soil wind erosion and water loss. Ridge building can accumulate natural precipitation, reduce soil erosion and soil nutrient loss, and the anti-corrosion liquid film can prevent erosion and retain moisture, and can alleviate and improve the growth environment of ryegrass and white clover.

[0091] The soil moisture was measured in late April, and the soil volume moisture contents of treatment groups 1 to 5 were 18%, 17%, 19%, 13%, and 12%, respectively. Since the soil moisture of treatment groups 4 and 5 was poor, no mowing was performed in each group. The soil moisture was measured again in mid-May, and the soil volume moisture contents of treatment groups 1 to 3 were all >16%. Therefore, peanuts were planted according to the planting method of Example 5. Half a month after planting, the survival rate and yield of peanuts were counted. After the peanuts were harvested, the soil bulk density, soil porosity, and organic matter content were counted, and the results are shown in Table 4.

[0092] Table 4 Survival rate, yield and soil evaluation of each group of peanuts

[0093]

[0094] Organic matter is an important condition for the formation of soil aggregate structure. If the soil forms a relatively large number of aggregate structures, there will be multi-level gaps of different sizes, the interior will be loose and porous, and the soil porosity will increase accordingly. As shown in Table 4, the planting method of climate-smart agriculture in semi-arid windy and sandy areas of the present invention can effectively achieve erosion prevention, carbon increase and fertilization, can effectively increase the soil organic matter content and soil porosity, and increase the survival rate and yield of crops in sandy land degradation areas, while preventing wind and fixing sand, it can increase economic benefits, and can improve sandy land degradation and carbon increase and fertilization in the long term.

[0095] It can be seen from the above embodiments that the anti-corrosion liquid membrane of the present invention has good anti-corrosion and moisture retention capabilities, can promote soil granulation, improve soil structure, and has good film-forming properties and tensile strength; the planting method of climate-smart agriculture in semi-arid windy and sandy areas of the present invention can improve the survival rate and yield of crops in sandy degraded areas, and can effectively increase the soil organic matter content and soil porosity, which can increase economic benefits while preventing wind and fixing sand, and can improve sand degradation and increase carbon and fertility in the long term.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant liquid film, It is characterized in that The invention comprises 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 a crosslinking agent, 8-12 parts of guar gum and 120-150 parts of water; the crosslinking agent is polyethylene glycol.

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

3. A planting method for climate-smart agriculture in semi-arid sandy areas, It is characterized in that The following steps are involved: (1) After the previous crop is harvested in mid-to-late September, fertilize and build ridges; (2) after ridge building, sowing grass seeds; after sowing, spraying the anti-corrosion liquid film according to claim 1; (3) Measure soil moisture from late April to early May. If the soil moisture content is ≥16%, mow the grass, press it down with shallow rotation, and plant corn. If the soil moisture content is <16%, do not mow. (4) If the grass is not cut in late April to early May, continue to measure the soil moisture in mid-to-late May. If the soil volume moisture content is ≥16%, cut the grass and plant peanuts or millet without tillage; if the soil volume moisture content is <16%, do not cut the grass; (5) If the grass is not mowed in mid-to-late May, wait until late June to early July when the grass seeds are ripe and harvested, and then sow sunflowers in a no-till manner.

4. The planting method according to claim 3, It is characterized in that The specifications of the ridge body are as follows: ridge height 13-15cm, ridge bottom width 80-100cm, ridge surface width 50-70cm, ridge ditch between two ridges, ridge ditch width 80-100cm.

5. The planting method according to claim 3, It is characterized in that The grass species include grass species of the Poaceae family and grass species of the Leguminosae family. The grass species of the Poaceae family include ryegrass, and the leguminous grass species include white clover.

6. The planting method according to claim 5, It is characterized in that The mass ratio of the grass seeds of the Gramineae family to the grass seeds of the Leguminosae family is 2 to 3:1, and the sowing amount of the grass seeds is 1.2 to 1.5 kg / mu.

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

8. The planting method according to claim 3, It is characterized in that The method for using the anti-corrosion liquid film is as follows: after mixing the anti-corrosion liquid film with water in a volume ratio of 1:3-6, spraying is performed, and the spraying amount is 20-30 kg / mu.

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

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

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