Compound agent for improving saline alkali soil and application

Abstract

The invention discloses a compound agent for improving saline alkali soil and application. Chlorella and photosynthetic bacteria are mixed and stirred to obtain a bacteria-algae mixed solution; the method comprises the following steps: uniformly spreading flue gas desulfurization gypsum on the surface of saline-alkali soil before sowing, and uniformly mixing the desulfurization gypsum with the soil by using a rotary cultivator; the method comprises the following steps: planting a saline-alkaline tolerant plant sorghum hybrid sudangrass on the soil, adding a bacteria-algae mixed solution into the saline-alkaline soil in a growth period of the sorghum hybrid sudangrass, and collecting a soil sample in a mature period of the sorghum hybrid sudangrass; the microorganisms promote the formation of aggregates, improve the porosity of soil, reduce water evaporation and increase the water-retaining property of the soil. The use of the desulfurized gypsum can further increase the number of microorganisms, promote the activity of microorganisms in the microbial agent and improve the granular structure of soil, so that the combined action of the desulfurized gypsum and the microbial agent improves the soil fertility, reduces the salt content of the soil and realizes the sustainable development of agriculture.

Description

Technical Field

[0001] The invention belongs to the technical field of soil remediation, and specifically relates to a compound agent for improving saline-alkali soil and an application thereof. Background Art

[0002] Soil salinization is a global environmental problem that needs to be solved urgently, and it is also an important reserve arable land resource. At present, the global saline-alkali land area accounts for 23% of the total arable land area. Due to the high salinity and alkali content of the soil and low fertilizer efficiency, the soil productivity is seriously restricted and the agricultural economy is affected. With the population growth, social and economic development and urbanization, the demand for electricity is increasing. The chemical waste desulfurization gypsum produced by the wet desulfurization of coal-fired flue gas byproducts has increased year by year, but the utilization rate is low, resulting in the accumulation of desulfurization gypsum and occupying a large amount of land resources. The application of desulfurization gypsum in saline-alkali improvement is not only low-cost, economical and practical, but also avoids the above problems.

[0003] In agricultural production, the long-term irrational application of chemical fertilizers has caused a large amount of chemical fertilizers to remain in the soil or be leached into the lower soil, which not only caused huge waste, but also polluted the groundwater source and damaged the ecological environment. In addition, factors such as low rainfall, strong evaporation and unreasonable irrigation systems in arid areas have restricted the movement of water, gas and nutrients in the soil, leading to soil compaction, deterioration of structure, nutrient imbalance, salinization and secondary salinization. The application of green and environmentally friendly microorganisms has become a new way to improve saline-alkali land.

[0004] In view of the above shortcomings, the industry is in urgent need of a compound agent that is environmentally friendly and can continuously improve the physical structure of the soil. Rationally taking measures such as chemical waste resources and biological improvers to improve soil utilization is of great significance to achieving sustainable agricultural development. Summary of the invention

[0005] Based on the above analysis, the present invention provides a compound agent for improving saline-alkali soil and its application, so as to solve the problem that industrial waste cannot be utilized, and achieve the effect of implementing sustainable green and environmentally friendly improvement of saline-alkali soil.

[0006] The present invention is achieved by the following technical means:

[0007] The invention discloses a compound agent for improving saline-alkali soil, comprising:

[0008] 20-60 parts of desulfurized gypsum; and

[0009] Bacteria and algae mixed solution; wherein:

[0010] The bacteria-algae mixed liquid is prepared by mixing 12-28 parts of Chlorella and 12-28 parts of photosynthetic bacteria.

[0011] Furthermore, the desulfurization gypsum is flue gas desulfurization gypsum.

[0012] Furthermore, the Chlorella is GY-D12 Chlorella pyrenoidosa, and the photosynthetic bacteria is Rhodopseudomonas capsulatus.

[0013] The present invention also discloses an application of any of the above compounding agents in improving saline-alkali soil, comprising:

[0014] Before sowing, spread the desulfurized gypsum on the surface of saline-alkali soil, and use a rotary tiller to mix the desulfurized gypsum and soil evenly;

[0015] Plant salt-alkali tolerant plants on the soil, add the bacteria-algae mixture to the saline-alkali soil during the plant growth period, irrigate according to the growth period, and harvest when the plants mature.

[0016] Furthermore, the salt-alkali tolerant plant is sorghum.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention uses industrial waste and microbial agents to prepare a compound agent for improving saline-alkali soil, and applies it to the improvement of saline-alkali soil to achieve green and sustainable improvement. It can effectively reduce the salinity and alkali content of the soil, increase soil fertility, and thus improve the overall quality of the soil, promote the growth of sorghum, and increase yield.

[0019] 2. The use of desulfurized gypsum in the formula of the present invention can make the composition of soluble salts in the soil mainly contain Na + 、HCO3 - 、CO3 2- and Cl - The sodium salt ions are converted into mainly Ca 2+ and SO4 2- Neutral salt ions. The use of microbial agents can promote the formation of aggregates, increase soil porosity, reduce water evaporation, and increase soil water retention. In addition, the addition of desulfurized gypsum can increase the number of microorganisms, promote the activity of microorganisms in microbial agents, and further synergize to reduce the salt content in the soil. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0022] Example 1

[0023] A saline-alkali soil conditioner and application thereof, comprising:

[0024] According to the weight ratio, 12 parts of GY-D12 Chlorella vulgaris and 28 parts of Rhodopseudomonas capsulatus are mixed and stirred evenly to obtain a bacteria-algae mixed solution for use;

[0025] Take 20 parts of flue gas desulfurization gypsum and apply it to saline-alkali soil before sowing, plant sorghum on the soil, add the bacteria and algae mixture to the saline-alkali soil during the growth period of sorghum, irrigate according to the growth period of sorghum, and harvest after sorghum matures.

[0026] Example 2

[0027] A saline-alkali soil conditioner and application thereof, comprising:

[0028] According to the weight ratio, 28 parts of GY-D12 Chlorella vulgaris and 12 parts of Rhodopseudomonas capsulatus are mixed and stirred evenly to obtain a bacterial-algae mixed solution for use;

[0029] Take 20 parts of flue gas desulfurization gypsum and apply it to saline-alkali soil before sowing, plant sorghum on the soil, add the bacteria and algae mixture to the saline-alkali soil during the growth period of sorghum, irrigate according to the growth period of sorghum, and harvest after sorghum matures.

[0030] Comparative Example 1

[0031] A saline-alkali soil conditioner and application thereof, comprising:

[0032] Take 20 parts of flue gas desulfurization gypsum and apply it to saline-alkali soil before sowing, plant sorghum on the soil, irrigate according to the growth period of sorghum, and harvest after sorghum matures.

[0033] Compared with Examples 1-2, Comparative Example 1 eliminates the use of the bacteria-algae mixed solution.

[0034] Comparative Example 2

[0035] A saline-alkali soil conditioner and application thereof, comprising:

[0036] According to the weight ratio, 12 parts of GY-D12 Chlorella vulgaris and 28 parts of Rhodopseudomonas capsulatus are mixed and stirred evenly to obtain a bacteria-algae mixed solution for use;

[0037] Sorghum is planted on saline-alkali soil. During the growth period of sorghum, a mixture of bacteria and algae is added to the saline-alkali soil. Irrigation is carried out according to the growth period of sorghum. Soil samples are collected after the sorghum matures.

[0038] Compared with Example 1, Comparative Example 2 eliminates the use of flue gas desulfurization gypsum.

[0039] Test Example 1

[0040] Comparison of planting experiments using the improvers in Examples 1-2 and Comparative Examples 1-2

[0041] 1. Overview of the test site

[0042] Soil conditions of experimental saline-alkali land: The soil in the experimental area is silt loam, with an organic matter content of 9.47g / kg, a total salt content of 8.64g / kg, an available nitrogen content of 43.25mg / kg, an available potassium content of 98.45g / kg, and an available phosphorus content of 33.35g / kg. There are 6 treatments, implementation groups and comparison groups, and 6 areas of the same size, each area is 0.08 acres.

[0043] 2. Test crops: Sorghum (Jiebao), planted in June 2022, irrigated according to the water consumption demand and rainfall during the growth period, and tested soil organic matter, available nitrogen, available potassium and other indicators after planting.

[0044] 3. Test the effect of the modifier of the present invention on the changes in soil physical and chemical properties before and after planting.

[0045] 4.1 Determination method

[0046] 4.1.1 Determination of soil nutrients:

[0047] Soil salinity, organic matter, available nitrogen, available phosphorus, and available potassium: For specific methods, refer to the third edition of Bao Shidan's "Soil Agrochemical Analysis".

[0048] The results are shown in Table 1:

[0049] Table 1 Data on soil and sorghum yield improvement

[0050] index Example 1 Example 2 Comparative Example 1 Comparative Example 2 Salt content (g / kg) 5.58 5.48 5.93 6.34 Organic matter (g / kg) 18.23 18.5 17.62 16.08 Available potassium (mg / kg) 166.1 170.7 164.5 154.33 Available nitrogen (mg / kg) 87.85 88.57 86.14 80.13 Available phosphorus (mg / kg) 60.39 62.58 57.98 55.11

[0051] According to the results in Table 1, the saline-alkali soil conditioner prepared by the method of the present invention can effectively increase the content of organic matter, available nitrogen, available phosphorus, and available potassium in the saline-alkali land, and reduce the salt content in the land. Among them, after the saline-alkali land was treated, the soil nutrients of Example 1 and Example 2 were higher than those of Comparative Examples 1-2, indicating that the bacteria-algae mixed solution and flue gas desulfurization gypsum in the soil conditioner prepared by the present invention played a significant synergistic role, which can effectively reduce the salinity and alkali content of the soil, increase soil fertility, and thus improve the overall quality of the soil.

[0052] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A compound agent for improving saline-alkali soil, comprising: Desulfurized gypsum 20-60 parts; as well as Bacteria and algae mixed solution; wherein: The bacteria-algae mixed liquid is prepared by mixing 12-28 parts of Chlorella and 12-28 parts of photosynthetic bacteria.

2. The compound according to claim 1, wherein: The desulfurization gypsum is flue gas desulfurization gypsum.

3. The compound according to claim 1, wherein: The chlorella is GY-D12 pyrenoid chlorella, and the photosynthetic bacteria is Rhodopseudomonas capsulatus.

4. An application of the compound according to any one of claims 1 to 3 in improving saline-alkali soil, comprising: Before sowing, spread the desulfurized gypsum on the surface of saline-alkali soil, and use a rotary tiller to mix the desulfurized gypsum and soil evenly; Plant salt-alkali tolerant plants on the soil, add the bacteria and algae mixture to the saline-alkali soil during the plant growth period, irrigate according to the growth period, and harvest when the plants mature.

5. The use according to claim 4, wherein: The salt-alkali tolerant plant is sorghum.