Ploughing layer construction material and preparation method and application thereof

Abstract

The invention provides a plough layer construction material as well as a preparation method and application thereof, and relates to the technical field of soil remediation. The method comprises the following steps: mixing garden waste with a nitrogen-containing organic material, and composting to obtain waste compost; the mass ratio of the trimmed branches in the garden waste is 50-80%; and mixing the waste compost with a calcium oxide-containing inorganic material to obtain the plough layer construction material. The prepared plough layer construction material aims at an acidified / acidic low-fertility soil plough layer, the pH value of soil can be rapidly adjusted, soil organic matter is increased, the soil agglomeration structure and the soil microbial environment are effectively improved, in-season transformation and in-season planting can be achieved, and the comprehensive application effect is better than that of commercial organic fertilizer, biochar and other organic material products. Furthermore, the selected garden waste, nitrogen-containing organic materials and calcium oxide-containing inorganic materials all belong to waste products, waste is turned into wealth, the preparation cost is low, and the requirements of circular economy and low-carbon emission reduction are met.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a tillage layer construction material and a preparation method and application thereof. Background Art

[0002] Ensuring the quantity and quality of cultivated land is an important foundation for achieving food safety. In some areas, the problem of "non-grain" cultivated land is quite serious, among which the largest proportion is the planting of seedlings and flowers, which is as high as more than 80%. The planting of garden plants such as seedlings and flowers has produced a large amount of "non-grain" cultivated land with peeling of the tillage layer. The transplanting measures of such plants with soil have caused the surface of the cultivated land to be peeled off, the tillage layer and the plow bottom layer to become shallower or even disappear, and the original soil structure to be destroyed, resulting in soil acidification, reduced fertility, nutrient imbalance and deterioration of soil structure. In addition, due to the need for balance between cultivated land occupation and compensation, a large number of newly reclaimed cultivated land have been built on hilly and gentle slopes. The tillage layer of these newly reclaimed cultivated lands uses foreign soil, which generally has acidic and low fertility characteristics, and the soil aggregation structure and soil microbial environment also need to be further improved.

[0003] In recent years, in order to quickly achieve the coordinated improvement of soil structure and soil nutrients, the application of engineering materials to improve the efficiency of soil tillage layer construction has received widespread attention. For example, related technologies use a combination of peat, biochar, functional microbial agents and soil conditioners to quickly construct the tillage layer of non-grain farmland. However, there are some problems in this research. On the one hand, the price of organic materials such as peat and biochar is relatively high, which is not conducive to large-scale promotion in terms of transformation cost; on the other hand, this method requires multiple materials to be applied in steps, and the operation procedure is relatively complicated, which is not conducive to implementation. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a tillage layer construction material and its preparation method and application. The tillage layer construction material prepared by the present invention can quickly adjust the pH value of the acidified / acidic low-fertility soil tillage layer, increase the soil organic matter, and is low-cost and easy to implement.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing a tillage layer construction material, comprising the following steps:

[0007] Mixing garden waste with nitrogen-containing organic materials, and composting the obtained mixture to obtain waste compost; the garden waste includes first garden waste and second garden waste, the first garden waste is pruned branches, and the second garden waste includes one or more of garden greening leaves, lawn trimmings, and river maintenance aquatic plants; the mass proportion of the first garden waste in the garden waste is 50-80%, the mass ratio of carbon and nitrogen in the garden waste is ≥50; the mass ratio of carbon and nitrogen in the nitrogen-containing organic materials is ≤15;

[0008] The waste compost is mixed with inorganic materials containing calcium oxide to obtain the tillage layer construction material; the mass content of calcium oxide in the inorganic materials containing calcium oxide is ≥20%.

[0009] Preferably, the nitrogen-containing organic material includes livestock and poultry breeding waste and / or organic sludge.

[0010] Preferably, the mass ratio of the garden waste to the nitrogen-containing organic material is (2-4):1; the mass ratio of carbon and nitrogen elements in the mixture is 25:1-40:1.

[0011] Preferably, before composting, the water content of the mixture is adjusted to 50-60 wt %; and the composting time is 30-50 days.

[0012] Preferably, the moisture content of the waste compost is less than 35%, and the seed germination index is ≥ 70%.

[0013] Preferably, the inorganic material containing calcium oxide includes fly ash; and the mass ratio of the waste compost to the inorganic material containing calcium oxide is (70-90):(10-30).

[0014] The present invention provides a tillage layer construction material prepared by the preparation method described in the above technical solution.

[0015] Preferably, the pH value of the tillage layer construction material is 8-12, the organic matter is ≥20wt%, the total nutrients are ≥2wt%, the calcium oxide is ≥5wt%, and the mass content of stable organic carbon in the total organic carbon is ≥80wt%.

[0016] The present invention provides an application of the tillage layer construction material described in the above technical solution in improving acidified / acidic low-fertility soil, and the application method comprises the following steps:

[0017] The tillage layer construction material is added to the surface layer of the acidified / acidic low-fertility soil tillage layer and tillage is performed.

[0018] Preferably, the pH value of the acidified / acidic low-fertility soil is ≤5.5, and the soil organic matter content is ≤20g / kg; the added amount of the tillage layer construction material is 250kg / mu to 1000kg / mu.

[0019] The present invention provides a method for preparing a tillage layer construction material, comprising the following steps: mixing garden waste with nitrogen-containing organic materials, composting the obtained mixture to obtain waste compost; mixing the waste compost with an inorganic material containing calcium oxide to obtain the tillage layer construction material. The present invention selects garden waste with a mass ratio of 50 to 80% of pruned branches as raw materials, which contains a large amount of lignin, so that the proportion of stable organic carbon in the prepared tillage layer construction material is high, which is difficult to decompose quickly, and is conducive to the stable improvement of soil organic matter. At the same time, it contains a certain proportion of fallen leaves, lawn trimmings and one or more of river maintenance aquatic plants. These materials contain a high proportion of easily degradable organic carbon, which can be quickly converted and utilized by soil microorganisms and plants; the present invention compounded garden waste compost and inorganic materials containing calcium oxide, and the inorganic materials contain a large amount of calcium oxide components, which can quickly adjust the pH value of acidic soil. The tillage layer construction material prepared by the present invention is aimed at the tillage layer of acidified / acidic low-fertility soil, can quickly adjust the soil pH value, increase soil organic matter, and effectively improve the soil aggregation structure and soil microbial environment. Moreover, since the compost is fully mature, it can be transformed and planted in the same season, and the comprehensive application effect is better than commercial organic fertilizers, peat, biochar and other organic material products. Furthermore, the garden waste, nitrogen-containing organic materials and calcium oxide-containing inorganic materials selected by the present invention are all waste products, which are turned into treasures, with low preparation costs, and meet the requirements of circular economy and low carbon emissions.

[0020] The present invention provides the application of the tillage layer construction material described in the above technical solution in the improvement of acidified / acidic low-fertility soil. The tillage layer construction material prepared by the present invention can quickly adjust the soil pH value of the acidified / acidic low-fertility soil tillage layer, increase soil organic matter, and effectively improve the soil aggregation structure and soil microbial environment. The production cost is low, low-carbon and environmentally friendly. It is directly applied during application, and the steps are simple and easy to implement. DETAILED DESCRIPTION

[0021] The present invention provides a method for preparing a tillage layer construction material, comprising the following steps:

[0022] Mixing garden waste with nitrogen-containing organic materials, and composting the obtained mixture to obtain waste compost; the garden waste includes first garden waste and second garden waste, the first garden waste is pruned branches, and the second garden waste includes one or more of garden greening leaves, lawn trimmings, and river maintenance aquatic plants; the mass proportion of the first garden waste in the garden waste is 50-80%, the mass ratio of carbon and nitrogen in the garden waste is ≥50; the mass ratio of carbon and nitrogen in the nitrogen-containing organic materials is ≤15;

[0023] The waste compost is mixed with an inorganic material containing calcium oxide to obtain the tillage layer construction material; the mass content of calcium oxide in the inorganic material containing calcium oxide is ≥20%.

[0024] The invention mixes garden waste with nitrogen-containing organic materials, composts the obtained mixture, and obtains waste compost.

[0025] In the present invention, the garden waste includes a first garden waste and a second garden waste, the first garden waste is a pruning branch, and the second garden waste includes one or more of easily degradable garden greening fallen leaves, lawn prunings and river maintenance aquatic plants. In the present invention, the first garden waste has a high lignin content and is difficult to degrade; the second garden waste is easily degradable. In the present invention, the mass proportion of the first garden waste in the garden waste is 50-80%, preferably 60-70%; the mass ratio of carbon and nitrogen elements (i.e. C / N) in the garden waste is ≥50. The garden waste selected in the present invention has a high carbon content and contains a high proportion of pruning branches with a high lignin content and not easily degradable, so that the proportion of stable carbon in the cultivated layer construction material obtained is high, which is difficult to decompose quickly, and is conducive to the stable improvement of soil organic matter; at the same time, the garden waste contains a certain proportion of easily degradable garden greening fallen leaves, lawn prunings and river maintenance aquatic plants, which can provide easily degradable organic carbon required for soil microorganisms and plant growth.

[0026] Before use, the garden waste is preferably crushed in the present invention, the crushed particle size is preferably less than 3 cm, and the crushing is preferably performed using a crusher.

[0027] In the present invention, the carbon-nitrogen mass ratio of the nitrogen-containing organic material is ≤15, and the nitrogen-containing organic matter is a material with a high nitrogen content. In the present invention, the nitrogen-containing organic material preferably includes livestock and poultry breeding waste (such as livestock and poultry manure) and / or organic sludge.

[0028] In the present invention, the mass ratio of the garden waste to the nitrogen-containing organic material is preferably (2-4):1, specifically, so that the mass ratio of carbon and nitrogen elements in the mixture is 25:1-40:1.

[0029] In the present invention, before the composting, the moisture content of the mixture is preferably adjusted to 50-60wt%. When the moisture content of the mixture is less than the above range, additional water is required to adjust it to the required range value. The present invention controls the moisture content of the mixture, which is conducive to the growth and reproduction of composting microorganisms. In the present invention, the composting is preferably aerobic composting, and the specific operation of the aerobic composting is preferably turning the compost once every 7 to 10 days. In the present invention, the composting time is preferably 30 to 50 days, specifically 30 days, 35 days, 40 days, 45 days, and 50 days. In the present invention, the moisture content of the waste compost is preferably <35%, the seed germination index is preferably ≥70%, and more preferably ≥90%, and the seed germination index is determined according to NYT525-2021 "Organic Fertilizer". The compost of garden waste after composting treatment contains a certain proportion of stable organic carbon and easily degradable organic carbon components, which can effectively replace stable organic carbon sources such as herbaceous peat, woody peat, biochar, etc., and provide easily degradable organic carbon sources for soil microorganisms and plants to transform and absorb.

[0030] After obtaining the waste compost, the present invention mixes the waste compost with an inorganic material containing calcium oxide to obtain the tillage layer construction material.

[0031] Before the mixing, the waste compost is preferably crushed in the present invention, and the crushed particle size is preferably less than 1 cm. The crushing is preferably performed using a crusher.

[0032] In the present invention, the mass content of calcium oxide in the inorganic material containing calcium oxide is ≥20%, preferably 60-70%, and the inorganic material containing calcium oxide is preferably fly ash, which is industrial waste. In the present invention, the mass ratio of the waste compost to the inorganic material containing calcium oxide is preferably (70-90): (10-30), specifically 70:30, 80:20, 90:10. The present invention compounds organic materials and inorganic materials, and adds inorganic materials containing a large amount of calcium oxide components, which can quickly adjust the pH value of acidic soil, realize the improvement of soil acidification function, and the effect is stable and continuous.

[0033] The present invention has no special requirements for the method of mixing the waste compost with the inorganic material containing calcium oxide, as long as they are fully mixed. The garden waste, nitrogen-containing organic material and inorganic material selected by the present invention are waste products, which turn waste into treasure, reduce preparation costs, and meet the requirements of circular economy and low carbon emissions.

[0034] The present invention provides a tillage layer construction material prepared by the preparation method described in the above technical solution. In the present invention, the pH value of the tillage layer construction material is preferably 8-12, the organic matter is preferably ≥20wt%, the total nutrients (i.e., N+P2O5+K2O) is preferably ≥2wt%, the calcium oxide is preferably ≥5wt%, and the mass content of stable organic carbon in the total organic carbon is preferably ≥80%. The present invention provides a high-quality tillage layer construction material that can quickly adjust the pH value of acidic soil, increase soil organic matter, and effectively improve soil aggregation structure and soil microbial environment.

[0035] The present invention provides an application of the tillage layer construction material described in the above technical solution in the restoration of acidified / acidic low-fertility soil, and the application method comprises the following steps:

[0036] The tillage layer construction material is added to the surface layer of the acidified / acidic low-fertility soil tillage layer and tillage is performed.

[0037] In the present invention, the pH value of the acidified / acidic low-fertility soil is preferably ≤5.5, and the soil organic matter content is preferably ≤20g / kg; the addition amount of the tillage layer construction material is preferably 250kg / mu to 1000kg / mu; when the soil acidity is high, it is necessary to increase the proportion of calcium oxide-containing inorganic materials, and when the soil organic matter content is low, it is necessary to increase the addition amount of the tillage layer construction material.

[0038] The tillage layer construction material provided by the present invention can realize the rapid repair of acidified / acidic low-fertility soil tillage layer (such as "non-grain" farmland or newly reclaimed farmland), and quickly achieve the effect of acid adjustment and quality improvement. Since the tillage layer construction material is a decomposed material, it can be planted in the same season after the transformation.

[0039] In order to further illustrate the present invention, the tillage layer construction material provided by the present invention and its preparation method and application are described in detail below in combination with examples, but they should not be understood as limiting the protection scope of the present invention.

[0040] Example 1

[0041] A method for preparing a high-quality tillage layer construction material is as follows:

[0042] Selecting garden waste raw materials such as pruned branches, fallen leaves, lawn trimmings and river maintenance aquatic plants, wherein the proportion of pruned branches in the garden waste is 60wt%, and the mass ratio of carbon and nitrogen elements in the garden waste is 55; crushing the garden waste with a crusher to a particle size of less than 3cm, and the water content of the crushed garden waste is 30.1wt%;

[0043] The livestock and poultry manure cleaned from the pig farm was selected as the organic material, the livestock and poultry manure had a water content of 70.9wt% and a carbon-nitrogen mass ratio of 13;

[0044] The garden waste and livestock and poultry manure are mixed in a mass ratio of 2:1 and then aerobic composting is performed, the initial moisture content of the compost is adjusted to 55wt%, the compost is turned once every 7 days, and after 40 days of composting, the compost is basically decomposed to obtain garden waste compost, and the seed germination index is 90.20%;

[0045] The garden waste compost and fly ash were mixed in a mass ratio of 8:2 to obtain a tillage layer construction material, wherein the fly ash had a CaO (calcium oxide) content of 69.78 wt % according to XRF analysis. Table 1 shows the physicochemical indexes of the garden waste compost, and Table 2 shows the elemental composition of the selected fly ash. The physicochemical properties of the tillage layer construction material prepared in Example 1 are shown in Table 3.

[0046] Table 1 Physical and chemical indicators of garden waste composting

[0047]

[0048] Table 2 Elemental composition of fly ash

[0049] element <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Fe2O3]]> <![CDATA[K2O]]> CaO MgO <![CDATA[SO3]]> <![CDATA[TiO2]]> <![CDATA[P2O5]]> Content (wt%) 9.22 5.41 2.62 0.61 69.78 0.82 9.34 0.86 0.09

[0050] Table 3 Physical and chemical properties of tillage layer construction materials

[0051]

[0052] Example 2

[0053] The tillage layer construction material prepared in Example 1 was subjected to an indoor simulation test, and the following treatment groups were designed: CK (control group); treatment 1: commercial organic fertilizer; treatment 2: garden waste compost (prepared in Example 1); treatment 3: tillage layer construction material (prepared in Example 1); treatment 4: commercially available rice straw biochar. Experimental process: Treatments 1 to 4 were added with equal amounts of organic carbon, and soil physicochemical properties and microbial determinations such as soil pH, organic matter, water-stable macroaggregates, and microbial biomass carbon were performed after 90 days of cultivation. Table 4 shows the physicochemical properties of materials in different treatment groups.

[0054] Table 4 Physicochemical properties of materials in different treatment groups

[0055]

[0056] Note: In Table 4, SOC is total organic carbon, organic matter = 1.724 × SOC; LCP1 is mainly composed of non-cellulosic polysaccharides from plant cells or microbial cells, and the main component of LCP2 is plant-derived cellulose. LCP1 + LCP2 represents easily degradable organic carbon, and stable organic carbon = SOC - LCP1 - LCP2.

[0057] According to the data in Table 4, the lowest proportion of stable organic carbon in commercial organic fertilizer is 64.0%, the highest proportion of stable organic carbon in rice straw biochar is 99.1%, the stable proportions of garden waste compost and tillage layer construction materials are 83.1% and 84.3%, respectively. The proportions of stable and easily degradable organic carbon are between those of commercial organic fertilizer and rice straw biochar.

[0058] The test soil for the indoor simulation test was red soil with a pH value of 4.62, 13.74 g / kg organic matter, 0.65 g / kg total nitrogen, 2.16 mg / kg available phosphorus, and 114.85 mg / kg available potassium, which is an acidic soil with low fertility level.

[0059] 100g of air-dried soil sample was weighed into a culture bottle, and the tillage layer construction material (5g) was used as the basis. The remaining treatments added organic materials with equal organic carbon content, added deionized water with a maximum field water holding capacity of 65%, and covered with a bottle cap with a vent to ensure air exchange. The culture bottle was then placed in a constant temperature incubator at a temperature of 25°C and a humidity of 75% for a 90-day culture experiment. After 90 days of culture, the pH value, soil organic matter, water-stable macroaggregates, and microbial biomass carbon of each treatment were determined, and the results are shown in Table 5.

[0060] Table 5 Soil physicochemical properties and microbiological determination results of different treatment groups after 90 days of cultivation

[0061]

[0062] According to Table 5, the addition of organic materials such as commercial organic fertilizer, garden waste compost, tillage layer construction materials, and rice straw biochar can improve the pH value, soil organic matter, water-stable macroaggregates, and microbial biomass carbon of the culture soil to a certain extent, but there are differences between the treatments with different added materials. The addition of commercial organic fertilizer has the smallest increase in soil organic matter among the four treatments, which is related to the relatively high content of easily degradable organic carbon in commercial organic fertilizer, and more carbon loss during the cultivation process. The addition of garden waste compost can increase soil organic matter, water-stable macroaggregates, and microbial biomass carbon, but the effect of improving soil pH is limited, and the pH value is only increased by 0.14 units. The tillage layer construction materials contain stable organic carbon, easily degradable organic carbon, and inorganic materials containing calcium oxide at the same time, which can not only effectively adjust the pH value of acidic soil, increase the pH value of soil organic matter, but also effectively improve the soil aggregation structure and soil microbial biomass content. Rice straw biochar has the highest proportion of stable organic carbon content and is the most effective in improving soil organic matter, but its effects on pH adjustment, soil aggregate structure, and soil microorganisms are not as good as those of tillage layer construction materials.

[0063] The addition of the tillage layer construction material in the embodiment of the present invention can quickly adjust the pH value of acidic soil, stably increase soil organic matter, and effectively improve soil aggregation structure and soil microbial environment, and its comprehensive application effect is the best among the four treatments. On the other hand, the raw materials of garden waste, livestock and poultry breeding waste and inorganic material fly ash selected for the tillage layer construction material in the embodiment of the present invention are all waste products, and the production cost is only 1 / 3 and 1 / 10 of the market price of commercial organic fertilizer and rice straw biochar.

[0064] Example 3

[0065] The tillage layer construction material prepared in Example 1 was subjected to a field test. The test area was located in Chunhu Ao Village, Chunhu Street, Fenghua District, Ningbo City, Zhejiang Province. The test plot was non-grain cultivated land for planting seedlings and flowers in the early stage. After land consolidation, there were many problems such as shallow tillage layer, soil acidification and soil fertility decline. Before the test, the physical and chemical properties of the tillage layer soil were pH 5.24, organic matter 17.36g / kg, total nitrogen 1.04g / kg, effective phosphorus 32.43mg / kg, and available potassium 90.75mg / kg. The soil was generally acidified and low in fertility. Before the test, the test plots were uniformly deep plowed 15cm to thicken the soil tillage layer. The test used the same 4 kinds of organic materials as in Example 2, and applied them according to 500kg / mu of tillage layer construction materials. The remaining treatments added organic materials with equal organic carbon content. The experimental field was planted with the rice variety "Yongyou 1540", and the cultivation management of each treatment was carried out in conventional ways. The experiment was carried out from June to November 2024. After the experiment, rice yield measurement and soil sampling analysis were carried out on November 5, 2024. The results are shown in Table 6.

[0066] Table 6 Results of rice yield and soil physical and chemical properties after the experiment

[0067]

[0068] According to Table 6, for soil improvement and restoration of non-grain cultivated land, treatment 3 using tillage layer construction materials has a significant effect on soil acidification improvement, soil organic matter increased by 4.56g / kg compared with the control, soil aggregation structure and soil microorganisms were significantly improved, and rice yield increased by 20.16% compared with the control. The comprehensive application effect is better than other organic material treatments. According to calculations, the material cost of using tillage layer construction materials is reduced by 200 yuan / mu and 400 yuan / mu respectively compared with commercial organic fertilizers and rice straw biochar.

[0069] Example 4

[0070] The tillage layer construction material prepared in Implementation 1 was subjected to field tests. The test area was located in Li'ao Village, Longguan Township, Haishu District, Ningbo City, Zhejiang Province. The test plot was newly reclaimed arable land. After reclamation, red soil was used as guest soil and 20 cm was recultivated as tillage layer soil. The soil physicochemical properties of the guest soil in the tillage layer of the test area were pH 4.43, organic matter 9.98g / kg, total nitrogen 0.54g / kg, available phosphorus 1.89mg / kg, and available potassium 98.65mg / kg. The guest soil belonged to acidic low-fertility soil. The test used the same 4 kinds of organic materials as in Example 2, and applied them according to 1000kg / mu of tillage layer construction materials. Organic materials with equal organic carbon content were added to the rest of the treatments. The experimental field was planted with the upland rice variety "Huhan 19", and the cultivation and management of each treatment were carried out in conventional ways. The experiment was carried out from June to November 2024. After the experiment, rice yield was measured and soil sampling and analysis were carried out on November 10, 2024. The results are shown in Table 7.

[0071] Table 7 Results of rice yield measurement and soil physical and chemical properties after the experiment

[0072]

[0073] According to Table 7, for the soil improvement and restoration of newly reclaimed cultivated land, the treatment 3 using tillage layer construction materials has a significant effect on soil acidification improvement, with soil organic matter increasing by 5.17 g / kg compared with the control, soil aggregation structure and soil microorganisms being significantly improved, and rice yield increasing by 20.84% ​​compared with the control, and the comprehensive application effect is better than other organic material treatments. According to calculations, the material cost of using tillage layer construction materials is reduced by 400 yuan / mu and 800 yuan / mu respectively compared with commercial organic fertilizers and rice straw biochar.

[0074] It can be seen from the above Examples 1 to 4 that the present invention has developed an efficient, economical, low-carbon and environmentally friendly soil improvement material, which makes full use of the renewable resource of garden waste. Through composting treatment, it not only realizes the resource utilization of waste, but also retains rich organic matter, nutrients and microbial communities. At the same time, the mixing of inorganic materials containing calcium oxide effectively improves the acidification regulation ability. The high-quality tillage layer construction material of the present invention, with its unique formula and significant improvement effect, provides a new idea for solving the soil tillage layer acidification / acidic low fertility problems existing in non-grain cultivated land and newly reclaimed cultivated land in the southern region. Its characteristics of rapid effectiveness and low cost are in line with the urgent needs of modern agriculture for efficient and economic soil improvement technology, and have broad application prospects and market promotion value.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. 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, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a tillage layer construction material, characterized in that: The following steps are involved: Mixing garden waste with nitrogen-containing organic materials, and composting the obtained mixture to obtain waste compost; the garden waste includes first garden waste and second garden waste, the first garden waste is pruned branches, and the second garden waste includes one or more of garden greening leaves, lawn trimmings, and river maintenance aquatic plants; the mass proportion of the first garden waste in the garden waste is 50-80%, the mass ratio of carbon and nitrogen in the garden waste is ≥50; the mass ratio of carbon and nitrogen in the nitrogen-containing organic materials is ≤15; The waste compost is mixed with inorganic materials containing calcium oxide to obtain the tillage layer construction material; the mass content of calcium oxide in the inorganic materials containing calcium oxide is ≥20%.

2. The preparation method according to claim 1, characterized in that: The nitrogen-containing organic materials include livestock and poultry breeding waste and / or organic sludge.

3. The preparation method according to claim 1 or 2, characterized in that: The mass ratio of the garden waste to the nitrogen-containing organic material is (2-4):1; the mass ratio of carbon and nitrogen elements in the mixture is 25:1-40:

1.

4. The preparation method according to claim 1, characterized in that: Before the composting, the water content of the mixed material is adjusted to 50-60wt%; the composting time is 30-50 days.

5. The preparation method according to claim 1 or 4, characterized in that: The water content of the waste compost is less than 35%, and the seed germination index is greater than or equal to 70%.

6. The preparation method according to claim 1, characterized in that: The inorganic material containing calcium oxide includes fly ash; the mass ratio of the waste compost to the inorganic material containing calcium oxide is (70-90): (10-30).

7. The tillage layer construction material obtained by the preparation method according to any one of claims 1 to 6.

8. The tillage layer construction material according to claim 7, characterized in that: The pH value of the tillage layer construction material is 8-12, the organic matter is ≥20wt%, the total nutrients are ≥2wt%, the calcium oxide is ≥5wt%, and the mass content of the stable organic carbon in the total organic carbon is ≥80wt%.

9. Use of the tillage layer construction material according to claim 7 or 8 in improving acidified / acidic low-fertility soil, the method of using the material comprising the following steps: The tillage layer construction material is added to the surface layer of the acidified / acidic low-fertility soil tillage layer and tillage is performed.

10. The use according to claim 9, characterized in that: The pH value of the acidified / acidic low-fertility soil is ≤5.5, and the soil organic matter content is ≤20g / kg; the added amount of the tillage layer construction material is 250kg / mu to 1000kg / mu.

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