A method of mitigating soil degradation in an installation

Abstract

A method for slowing down facility soil degradation, during the idle period after the planting of the previous crop of facility crops, according to the EC value of the 0-20 cm plough layer soil, adding easily decomposable organic material in the plough layer soil; after ploughing evenly, adjusting the soil moisture content to 80% to 100% of the field water holding capacity, covering the soil surface with a film, raising the plough layer soil temperature to 70-80 DEG C, keeping the soil high temperature for 3-7 days, then uncovering the film and airing for 3-5 days, then the planting of the next crop of facility crops can be carried out; during the planting period of the facility crops, keeping the plough layer soil temperature at 15-20 DEG C, and then applying special fertilizer. The application introduces soil high temperature treatment on the basis of implementing strong reduction soil sterilization method during the idle period, clearly defines the suitable interval of soil moisture treatment and the source of water, and according to the soil salt content, gives the optimized type and addition amount of organic material, and during the planting period of the facility crops, gives the matching water and fertilizer and soil temperature regulation scheme, avoiding the degradation of the facility soil again.

Description

Technical Field

[0001] This invention belongs to the field of soil management technology, specifically relating to a method for managing facility soil to mitigate the occurrence of facility soil degradation. Background Technology

[0002] Due to issues such as continuous cropping, excessive water and fertilizer input, and lack of natural rainfall leaching in greenhouse vegetable production, greenhouse soil degradation is rapid and severe, greatly hindering the sustainable production of greenhouse vegetables. Greenhouse soil degradation mainly includes soil acidification, salt accumulation, accumulation of autotoxic substances, and pathogen proliferation. In response to these greenhouse soil degradation problems, a series of prevention and control technologies have emerged. Regarding soil acidification and salinization, Chinese invention CN 107567744A provides a technology for irrigating and leaching salts during the fallow period and applying appropriate irrigation and fertilization during the planting period. However, irrigation and salt leaching leaches nitrogen, phosphorus, and other salts into the deeper soil layers, posing a risk of groundwater pollution, and is unsuitable for water-scarce areas. For soil-borne pathogens, the traditional method is soil fumigation using various chemical fungicides. However, while chemical fumigation kills soil pathogens, it also kills beneficial microorganisms in the soil. Furthermore, the residues of these chemical fumigants during and after use cause significant harm to human health and the ecological environment, leading to their gradual phasing out in recent years. Sun exposure and steam fumigation are also common practices, but their effects are inconsistent and they still indiscriminately kill most microorganisms in the soil, and may exacerbate salt accumulation.

[0003] Since the beginning of the 21st century, a method of strong reducing soil sterilization has been proposed, which involves adding organic materials to degraded greenhouse soil, followed by flooding, mulching, and fumigation to create intense soil reducing conditions in a short period of time. This method has been applied to greenhouse vegetable fields (CN 102405705A), banana continuous cropping soil (CN 107135699A), and sweet potato continuous cropping soil (CN 115231976A). The strong reducing soil sterilization method primarily utilizes the anaerobic environment and the substances released during the fermentation of organic materials that are toxic to soil-borne pathogens to kill aerobic pathogens. Simultaneously, it promotes the assimilation of nitrates and sulfates by soil microorganisms, converting them into organic or gaseous substances that leave the soil, thereby reducing the accumulation of nitrates and sulfates in the soil. However, this method still has many shortcomings: First, the treatment time is relatively long, usually requiring 2 to 4 weeks of mulching or flooding cultivation, followed by 7 to 10 days of sun-drying after removing the film or letting it dry; second, even when implemented during the high-temperature summer months, the soil temperature is usually below 50℃ due to mulching and sun exposure, which is insufficient to decompose autotoxic substances in the soil; third, it can only partially reduce the concentration of nitrates and sulfates accumulated in the soil, and has no effect on removing cations such as calcium, magnesium, and sodium; fourth, there is no optimized formula for the types and amounts of organic materials to be added; finally, if there are no corresponding water and fertilizer management and environmental control measures during the greenhouse crop planting period, the greenhouse soil will quickly degrade again. Summary of the Invention

[0004] Technical problem solved: In order to solve the above technical problems, this invention introduces high-temperature soil treatment on the basis of strong reducing soil sterilization during the fallow period, clarifies the suitable range of soil moisture treatment and the source of water, and provides optimized types and amounts of organic materials based on soil salinity. During the greenhouse crop planting period, it provides a matching water, fertilizer and soil temperature control scheme to avoid the re-degradation of greenhouse soil. Thus, it provides a fast and clean method to slow down the degradation of greenhouse soil.

[0005] Technical Solution: A method to mitigate soil degradation in greenhouse facilities, comprising the following steps: During the fallow period after the previous crop of greenhouse crops has finished growing, based on the EC value of the 0-20cm topsoil layer, add easily decomposable organic materials with a carbon-to-nitrogen ratio of 35-90 to the topsoil layer. When the EC value of the topsoil layer is ≥1000 μS / cm... -1 When adding organic material A (kg C ha) to the topsoil -1 )=30×EC(μS cm -1 ); Topsoil 1000 μS cm -1 EC≥500μS cm -1 When adding organic material A (kgC ha) to the topsoil -1 )=20×EC(μS cm -1 ); Topsoil EC < 500 μS cm -1 When adding organic material A (kgC ha) to the topsoil -1 )=10×EC(μS cm -1 After evenly tilling, adjust the soil moisture content to 80% to 100% of field capacity, cover the soil surface with film, raise the soil temperature to 70-80℃, maintain the high soil temperature for 3-7 days, then remove the film and let it dry for 3-5 days before planting the next crop of greenhouse crops; during the greenhouse crop planting period, maintain the soil temperature at 15-20℃, apply fertilizer with a sulfur content not exceeding 5wt.% and a chlorine content not exceeding 3wt.%, and apply at 80% of the recommended fertilizer amount for the target yield of the greenhouse crop.

[0006] Preferably, the above EC ≥ 1000 μS cm -1 Maintain high soil temperature for 7 days; 1000 μS cm -1 EC≥500μS cm -1 Maintain high soil temperature for 5 days; EC < 500 μS cm -1 At that time, keep the soil at a high temperature for 3 days.

[0007] Preferably, the aforementioned easily decomposable organic material is an organic material that has undergone ethanol fermentation.

[0008] Preferably, the organic material is distiller's grains, wheat straw, or sawdust.

[0009] Preferably, the above-mentioned soil heating is achieved by using a capillary water network buried in the soil for heat exchange.

[0010] During the fallow period, naturally collected rainwater is used to regulate soil moisture content, and during the planting period, naturally collected rainwater is also used to irrigate facility crops.

[0011] The heat source for the water flow used for heat exchange is a solar thermal collector installed above the rainwater collection pond.

[0012] Beneficial effects: First, the high-temperature treatment of soil during the fallow period significantly improves the strong reduction effect and greatly shortens the treatment time. Second, the short-term high-temperature treatment of soil during the fallow period kills pathogens and degrades autotoxic substances. Third, the invention provides an optimized amount of organic material to be added based on the soil salinity, ensuring the effectiveness of the strong reduction treatment while avoiding excessive input of organic materials, which would increase material and application costs. Fourth, the invention maintains a suitable moisture content in the fallow soil with rainwater and uses a mulch film treatment, which effectively removes nitrates and sulfates, saving water and preventing pathogens from river water, while also avoiding infiltration caused by flooding. This invention can pollute groundwater and dilute surface-accumulated cations such as calcium, magnesium, and sodium into deeper soil layers. Fifth, during the cultivation of greenhouse crops, this invention maintains the temperature of the topsoil within a suitable range for root growth, promoting root development, increasing root vitality, and accelerating the turnover of soil mineral nutrients, thereby improving nutrient absorption and utilization efficiency and reducing nutrient residues in the soil. Finally, this invention provides water and fertilizer management measures to support greenhouse crop cultivation, ensuring nutrient supply while controlling the excessive input of sulfur, chlorine, calcium, magnesium, and sodium ions, preventing the introduction of pathogens from river water, and avoiding further degradation of the greenhouse soil. In summary, this invention can quickly and effectively reduce salinity in greenhouse soil, degrade autotoxic substances in greenhouse soil, and kill pathogens in greenhouse soil using low-energy methods, while saving resources such as water, fertilizer, and organic materials. It also avoids the risk of groundwater pollution, and the greenhouse soil is less prone to re-degradation after replanting greenhouse crops. Detailed Implementation

[0013] The present invention will be further described in detail below through specific embodiments, but these embodiments do not limit the scope of the invention in any way. Unless otherwise specified, the technical solutions described in this invention are conventional techniques.

[0014] Example 1:

[0015] In a greenhouse where cucumbers have been grown for many years, during the fallow period after the previous cucumber crop was completed, the pH value of the topsoil (0-20 cm) was measured to be 4.87, and the EC value was 1220 μS cm⁻¹. -1 The gene copy number of the pathogen Fusarium oxysporum is 7.94 × 10⁻⁶. 7 copies g -1 The content of the self-toxic substance p-hydroxybenzoic acid is 96.3 μg. -1 In the topsoil, at 68.156 t ha -1 (36600kg C ha -1 The amount of lees added is 38.2 C / N ratio and 53.7% carbon content, with addition amounts set at 24400 and 12200 kg C ha. -1 A control group was established. After the distiller's grains and topsoil were evenly tilled, rainwater from the irrigation rainwater collection pond was used to adjust the soil moisture content to 80% to 100% field capacity. A control group using river water was also established. A 0.08mm thick transparent mulch film was then placed on the soil surface, with the edges buried in the soil to isolate it from air. A heat exchange system embedded in the soil was used to raise the topsoil temperature to 70–80℃. A control group without soil heating was also established. After maintaining the soil temperature for 7 days, the mulch film was removed, and the soil was allowed to dry for 3–5 days. The treated soil was then analyzed and tested before planting the next crop of cucumbers.

[0016] During the next cucumber crop planting period, based on the recommended fertilizer application rate per ton of target cucumber yield (3.2 kg N, 1.8 kg P2O5, and 4.5 kg K2O), and assuming a yield of 10 tons of cucumbers per mu (approximately 0.067 hectares) and 80% of the recommended application rate, the fertilizer application rate per mu was calculated to be 25.6 kg N, 14.4 kg P2O5, and 36.0 kg K2O. The fertilizer used was a low-sulfur, chlorine-free water-soluble fertilizer primarily composed of nitrates and phosphates (sulfur content less than 5 wt.%, chlorine content less than 3 wt.%). A conventional potassium sulfate compound fertilizer with the same nitrogen, phosphorus, and potassium application rate was used as a control. During cucumber cultivation, rainwater collected in a rainwater collection pond was used for irrigation, and a control group was irrigated with river water. A heat exchange system buried in the soil was used to maintain the topsoil temperature at 15–20℃, and a control group without soil heating was also included. After cucumber cultivation, the cucumber yield for each treatment was calculated, and the soil after planting was analyzed and tested.

[0017] The settings for the above 7 treatments are shown in Table 1. The soil properties after the 7 fallow periods, as well as the soil properties and cucumber yield after cucumber planting, are shown in Table 2.

[0018] Table 1. Processing Settings Table

[0019]

[0020] Table 2. Treatment Results

[0021]

[0022] 1) Different letters represent significant differences (p<0.05).

[0023] Table 2 shows the soil samples after 7 days of fallow treatment for treatments A, B, and C. The soil treated with organic material at a level of 30 EC (treatment A) showed the highest pH restoration to neutral, the lowest EC decrease, and the best control of soil pathogens (Fusarium oxysporum). Comparisons between treatments A, E, F, and D, G, under the same organic material addition and treatment time, raising the soil temperature from the natural 40–50℃ to 70–80℃ and using rainwater instead of river water significantly improved the remediation effect of degraded facility soils. Soil pH significantly increased to near neutral, EC significantly decreased, and the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid) significantly decreased.

[0024] Treatments A, E, and F all showed similar results in restoring fallow soil, demonstrating good remediation effects. However, when planting a cucumber crop after remediation, the application of low-sulfur, chlorine-free water-soluble fertilizer, irrigation with rainwater, and maintaining a topsoil temperature of 15–20°C resulted in minimal decreases in soil pH, minimal increases in EC, and no significant increases in the number of soil pathogens (Fusarium oxysporum) or the content of autotoxic substances (p-hydroxybenzoic acid). This indicates that treatment A maintained excellent soil quality. Conversely, maintaining a natural topsoil temperature of 8–12°C (treatment E) or applying sulfur-containing compound fertilizer and irrigating with river water (treatment F) caused a resurgence in soil pH, an increase in EC, and a rise in the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid), leading to a re-degradation of the remediated greenhouse soil. Cucumber yield also reflects the superior effectiveness of treatment A.

[0025] Using the same amount of organic material added, compared to natural soil temperature, application of sulfur-containing compound fertilizer, and irrigation with river water (Treatment G), the optimized Treatment A resulted in an 8.1% increase in soil pH, a 54.0% decrease in EC, a 96.2% decrease in the number of soil pathogens (Fusarium oxysporum), and a 73.1% decrease in the content of autotoxic substances (p-hydroxybenzoic acid) after the fallow period. After planting one season of cucumbers, the soil pH increased by 16.8%, the EC decreased by 62.1%, the number of soil pathogens (Fusarium oxysporum) decreased by 97.2%, the content of autotoxic substances (p-hydroxybenzoic acid) decreased by 72.7%, and the cucumber yield increased by 81.6%.

[0026] Example 2:

[0027] In a greenhouse where tomatoes have been grown for many years, during the fallow period after the previous tomato crop was completed, the pH value of the topsoil (0-20cm) was measured to be 5.11, and the EC value was 747 μS cm⁻¹. -1 The gene copy number of the pathogen Fusarium oxysporum is 2.87 × 10⁻⁶. 7 copies g -1 The content of the self-toxic substance p-hydroxybenzoic acid is 104.5 μg. -1 In the topsoil, at 25.670 t ha -1 (14940kg C ha -1 The addition amount is wheat straw fermented with ethanol, with a carbon-to-nitrogen ratio of 42.1 and a carbon content of 58.2%, and the addition amounts are set at 22410 and 7470 kg C ha. -1 A control group was established. Fermented wheat straw was evenly tilled into the topsoil, and rainwater from a rainwater collection pond was used to adjust the soil moisture content to 80%–100% field capacity. A control group using river water was also included. A 0.08 mm thick transparent mulch was then placed on the soil surface, with the edges buried in the soil to isolate it from air. A heat exchange system embedded in the soil was used to raise the topsoil temperature to 70–80°C. A control group without soil heating was also included. After maintaining the soil temperature for 5 days, the mulch was removed, and the soil was allowed to dry for 3–5 days. The treated soil was then analyzed and tested before planting the next crop of tomatoes.

[0028] During the next tomato crop, based on the recommended fertilizer application rate per ton of target tomato yield (3.3 kg N, 0.8 kg P2O5, and 4.8 kg K2O), and assuming a yield of 8 tons of tomatoes per acre and 80% of the recommended application rate, the fertilizer application rate per acre was calculated to be 21.12 kg N, 5.12 kg P2O5, and 30.72 kg K2O. A low-sulfur, chlorine-free water-soluble fertilizer primarily composed of nitrates and phosphates (sulfur content less than 5 wt.%, chlorine content less than 3 wt.%) was selected as the fertilizer. A conventional potassium sulfate compound fertilizer with the same nitrogen, phosphorus, and potassium application rate was used as a control. During the tomato planting period, rainwater collected in a rainwater collection pond was used for irrigation, and a control group was established using river water. A heat exchange system buried in the soil was used to maintain the topsoil temperature at 15–20°C, and a control group without soil heating was also included. After the tomato planting was completed, the tomato yield for each treatment was calculated, and the soil after planting was analyzed and tested.

[0029] The settings for the above 7 treatments are shown in Table 3. The soil properties after the 7 fallow periods, as well as the soil properties and tomato yield after tomato planting, are shown in Table 4.

[0030] Table 3. Processing Settings Table

[0031]

[0032] Table 4. Treatment Results

[0033]

[0034] 1) Different letters represent significant differences (p<0.05).

[0035] Table 4 shows the soil samples after 5 days of fallow treatment for treatments A, B, and C. The soils treated with organic materials at amounts of 20 EC (treatment A) and 30 EC (treatment B) showed comparable treatment effects. Treatments with 20 EC (treatment A) and 30 EC (treatment B) showed better results than those with 10 EC (treatment C) in restoring pH to neutral, reducing EC, killing soil pathogens (Fusarium oxysporum), and degrading autotoxic substances (p-hydroxybenzoic acid). Comparisons of the soils after treatments A, E, F, and D, G show that, with the same amount of organic materials added and treatment time, raising the soil temperature from the natural 40–50℃ to 70–80℃ and using rainwater instead of river water significantly improved the remediation effect of degraded facility soils. Soil pH significantly increased to near neutral, EC significantly decreased, and the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid) significantly decreased.

[0036] Treatments A, E, and F all showed similar effects in restoring fallow soil, demonstrating good remediation results. However, when planting a tomato crop after remediation, the application of low-sulfur, chlorine-free water-soluble fertilizer, irrigation with rainwater, and maintaining a topsoil temperature of 15–20°C resulted in minimal decreases in soil pH, minimal increases in EC, and no significant increases in the number of soil pathogens (Fusarium oxysporum) or the content of autotoxic substances (p-hydroxybenzoic acid). This indicates that treatment A maintained excellent soil quality. Conversely, when the topsoil was kept at a natural temperature of 8–12°C (treatment E) or irrigated with sulfur-containing compound fertilizer using river water (treatment F), the soil pH decreased again, EC increased again, and the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid) increased, leading to a re-degradation of the remediated greenhouse soil. Treatments A and B were comparable in their effectiveness in mitigating greenhouse soil degradation and in terms of tomato yield. Considering both operability and economic efficiency, treatment A was the preferred choice.

[0037] Using the same amount of organic material added, compared to natural soil temperature, application of sulfur-containing compound fertilizer, and irrigation with river water (Treatment G), the optimized Treatment A resulted in a 18.3% increase in soil pH, a 51.6% decrease in EC, a 94.6% decrease in the number of soil pathogens (Fusarium oxysporum), and a 75.4% decrease in the content of autotoxic substances (p-hydroxybenzoic acid) after the fallow period. After planting one season of tomatoes, the soil pH increased by 21.2%, EC decreased by 45.8%, the number of soil pathogens (Fusarium oxysporum) decreased by 95.7%, the content of autotoxic substances (p-hydroxybenzoic acid) decreased by 68.1%, and the tomato yield increased by 52.9%.

[0038] Example 3:

[0039] In a greenhouse where broccoli has been grown for many years, during the fallow period after the previous broccoli crop was completed, the pH value of the topsoil (0-20cm) was measured to be 5.32, and the EC value was 435 μS cm⁻¹. -1 The gene copy number of the pathogen Fusarium oxysporum is 3.63 × 10⁻⁶. 7 copies g -1 The content of the self-toxic substance p-hydroxybenzoic acid is 65.6 μg. -1 In the topsoil, at 6.378 t ha -1 (4350kg C ha -1 The addition amount is 63.3 carbon-nitrogen ratio and 68.2% carbon content wood chips that have undergone ethanol fermentation, with addition amounts set at 1305 and 8700 kg C ha. -1 A control group was established. After evenly mixing fermented sawdust with the topsoil, rainwater from a rainwater collection pond was used to adjust the soil moisture content to 80%–100% field capacity. A control group using river water was also included. A 0.08mm thick transparent mulch was then placed on the soil surface, with the edges buried in the soil to isolate it from air. A heat exchange system embedded in the soil was used to raise the topsoil temperature to 70–80°C. A control group without soil heating was also included. After maintaining the soil temperature for 3 days, the mulch was removed, and the soil was allowed to dry for 3–5 days. The treated soil was then analyzed and tested before planting the next crop of broccoli.

[0040] During the next broccoli planting season, based on the recommended fertilizer application rate per ton of target broccoli yield (10.8 kg N, 3.2 kg P2O5, and 9.6 kg K2O), and assuming a yield of 4 tons of broccoli per acre and 80% of the recommended application rate, the fertilizer application rate per acre was calculated to be 34.56 kg N, 10.24 kg P2O5, and 30.72 kg K2O. A low-sulfur, chlorine-free water-soluble fertilizer primarily composed of nitrates and phosphates (sulfur content less than 5 wt.%, chlorine content less than 3 wt.%) was selected as the fertilizer. A conventional potassium sulfate compound fertilizer with the same nitrogen, phosphorus, and potassium application rate was used as a control. During the broccoli planting season, rainwater collected in a rainwater collection pond was used for irrigation, and a control group was irrigated with river water. A heat exchange system buried in the soil was used to maintain the topsoil temperature at 15–20°C, and a control group without soil heating was also included. After the broccoli planting season, the broccoli yield for each treatment was calculated, and the soil after planting was analyzed and tested.

[0041] The settings for the above 7 treatments are shown in Table 5. The soil properties after the 7 fallow periods, as well as the soil properties and broccoli yield after planting, are shown in Table 6.

[0042] Table 5. Processing Settings Table

[0043]

[0044] Table 6. Treatment Results

[0045]

[0046] 1) Different letters represent significant differences (p<0.05).

[0047] Table 6 shows the soil samples after 3 days of fallow treatment for treatments A, B, and C. The treatment effects were comparable for soils treated with organic matter at amounts of 10 EC (treatment A), 30 EC (treatment B), and 20 EC (treatment C). All three treatments resulted in a return to neutral pH, a significant decrease in EC, and a significant reduction in the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid). Comparisons of the soil samples after treatments A, E, F, and D, G showed that, with the same amount of organic matter added and treatment time, raising the soil temperature from the natural 40–50℃ to 70–80℃ and using rainwater instead of river water significantly improved the remediation effect of degraded facility soils. These treatments resulted in a significant increase in soil pH, approaching neutral, a significant decrease in EC, and a significant reduction in the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid).

[0048] Treatments A, E, and F all showed similar effects in restoring fallow soil, demonstrating good remediation results. However, when planting a season of broccoli after remediation, the application of low-sulfur, chlorine-free water-soluble fertilizer, irrigation with rainwater, and maintaining a topsoil temperature of 15–20°C resulted in minimal decreases in soil pH, minimal increases in EC, and no significant increases in the number of soil pathogens (Fusarium oxysporum) or the content of autotoxic substances (p-hydroxybenzoic acid). This indicates that treatment A maintained excellent soil quality. Conversely, when the topsoil was kept at a natural temperature of 8–12°C (treatment E) or irrigated with sulfur-containing compound fertilizer using river water (treatment F), the soil pH decreased again, EC increased again, and the number of soil pathogens (Fusarium oxysporum) and the content of autotoxic substances (p-hydroxybenzoic acid) increased, leading to a re-degradation of the remediated greenhouse soil. Treatments A, B, and C showed comparable effects in mitigating greenhouse soil degradation and broccoli yield. Considering operability and economic efficiency, treatment A was the preferred choice.

[0049] Using the same amount of organic material added, compared to natural soil temperature, application of sulfur-containing compound fertilizer, and irrigation with river water (Treatment G), the optimized Treatment A resulted in a 9.92% increase in soil pH, a 35.7% decrease in EC, a 92.7% decrease in the number of soil pathogens (Fusarium oxysporum), and an 80.3% decrease in the content of autotoxic substances (p-hydroxybenzoic acid) after the fallow period. After planting one season of broccoli, the soil pH increased by 15.2%, the EC decreased by 33.8%, the number of soil pathogens (Fusarium oxysporum) decreased by 93.3%, the content of autotoxic substances (p-hydroxybenzoic acid) decreased by 65.9%, and the broccoli yield increased by 57.5%.

[0050] The above results indicate that the method for rapidly cleaning and mitigating facility soil degradation described in this invention can quickly and effectively reduce the salinity of facility soil, degrade autotoxic substances in facility soil, kill pathogens in facility soil, and save resources such as water, fertilizer, and organic materials. At the same time, it avoids the risk of groundwater pollution, and the facility soil is not prone to degradation again after facility crops are replanted.

[0051] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts of these solutions embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A method for mitigating soil degradation in facilities, characterized in that, The steps are as follows: During the fallow period after the previous crop of greenhouse crops has finished growing, based on the EC value of the 0-20 cm topsoil, add easily decomposable organic materials with a carbon-to-nitrogen ratio of 35-90 to the topsoil. When the EC value of the topsoil is ≥ 1000 μS / cm... −1 At that time, the amount of organic material added to the topsoil was A = 30 × EC; the topsoil density was 1000 μS cm. −1 EC ≥ 500 μS cm −1 When adding organic matter to the topsoil, the amount A = 20 × EC; when the topsoil EC < 500 μS cm⁻¹ −1 When adding organic material to the topsoil, the amount A = 10 × EC; the unit of the amount of organic material A is kg C ha. −1 The unit of EC is μS cm. −1 After evenly tilling, adjust the soil moisture content to 80% to 100% of field capacity, cover the soil surface with film, raise the soil temperature to 70-80 ℃, maintain the high soil temperature for 3-7 days, then remove the film and let it dry for 3-5 days before planting the next crop of greenhouse crops. During the greenhouse crop planting period, maintain the soil temperature at 15-20 ℃, apply fertilizer with a sulfur content not exceeding 5 wt.% and a chlorine content not exceeding 3 wt.%, and apply at 80% of the recommended fertilizer amount for the target yield of the greenhouse crop.

2. The method for mitigating facility soil degradation according to claim 1, characterized in that, The EC ≥ 1000 μS cm −1 Maintain high soil temperature for 7 days; 1000 μS cm −1 EC ≥ 500 μS cm −1 Maintain high soil temperature for 5 days; EC <500 μS cm −1 At that time, keep the soil at a high temperature for 3 days.

3. The method for mitigating facility soil degradation according to claim 1, characterized in that, The easily decomposable organic material is the organic material after ethanol fermentation.

4. The method for mitigating facility soil degradation according to claim 3, characterized in that, The organic material is distiller's grains, wheat straw, or sawdust.

5. The method for mitigating facility soil degradation according to claim 1, characterized in that, The soil heating is achieved through heat exchange via a capillary water network buried in the soil.

6. The method for mitigating facility soil degradation according to claim 1, characterized in that, The soil moisture content is adjusted during the fallow period using collected rainwater, and the irrigation facilities for crops during the planting period also use collected rainwater.

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