Method for preparing organic fertilizer from vegetable sick and stubborn plants and application of prepared organic fertilizer

Abstract

The invention belongs to the technical field of aerobic composting, and particularly relates to a method for preparing an organic fertilizer from vegetable sick and stubborn plants and application of the prepared organic fertilizer. The composition structure of microorganisms in the preparation raw materials can be optimized through the aerobic composting process, more non-pathogenic microorganisms are enriched into the organic fertilizer, breeding of pathogenic bacteria can be inhibited through increase of the non-pathogenic microorganisms, composition of the pathogenic bacteria in the organic fertilizer is reduced, and an organic fertilizer product with disease inhibiting and growth promoting effects is produced. The method provided by the invention not only is beneficial to sustainable management of vegetable wastes, but also solves the contradiction between the existing vegetable sick and stubborn plants and soil-borne diseases.

Description

Technical Field

[0001] The invention belongs to the technical field of aerobic composting, and particularly relates to a method for preparing organic fertilizer by using diseased and damaged vegetable plants and application of the prepared organic fertilizer. Background Art

[0002] Diseased vegetable plants, such as those infected by Fusarium oxysporum, pose a major challenge in agricultural waste management. If these diseased plants are not handled properly, they will cause environmental pollution, and the pathogens will multiply rapidly, causing soil-borne diseases and endangering subsequent planting. At present, the treatment methods for diseased plants include direct return to the field, composting and energy treatment, but each has its limitations. For example, the energy treatment methods of direct return to the field or incineration not only pollute the environment but also waste resources; although aerobic composting is an effective method for treating vegetable waste, it can degrade organic matter, kill pathogenic microorganisms and improve the soil. However, it is still uncertain whether the high concentration of pathogens in diseased plants can be completely removed during the composting process.

[0003] Recent studies have shown that non-pathogenic microorganisms have great potential in the composting process, especially in aerobic composting for treating diseased and damaged plants. However, in current agricultural practice, this technology has not been actually developed, and there is still a lack of aerobic composting methods for effectively treating diseased and damaged vegetable plants. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing organic fertilizer with diseased and damaged vegetable plants and application of the organic fertilizer prepared therefrom. The composition structure of microorganisms in the raw materials can be optimized through the aerobic composting process in the method, so that more non-pathogenic microorganisms can be enriched in the organic fertilizer, thereby inhibiting the reproduction of pathogens, reducing the composition of pathogens in the organic fertilizer, and producing an organic fertilizer product with disease inhibition and growth promotion effects.

[0005] The present invention provides a method for preparing organic fertilizer from diseased and damaged vegetable plants, comprising the following steps:

[0006] Mixing diseased and damaged vegetable plants with agricultural organic waste to obtain a mixed material;

[0007] The water content of the mixed material is adjusted to 55wt.% to 65wt.% and then aerobic composting is performed to obtain organic fertilizer.

[0008] Preferably, the diseased and damaged vegetable plants include diseased and damaged vegetable plants carrying Fusarium oxysporum.

[0009] Preferably, the vegetables include cucumbers.

[0010] Preferably, the carbon-nitrogen mass ratio of the mixed material is 18 to 25:1.

[0011] Preferably, after adjusting the water content of the mixed material to 55 wt.% to 65 wt.%, the method further includes adjusting the filling density of the mixed material to 0.20 to 0.60 kg / L.

[0012] Preferably, the aerobic composting time is 16 to 28 days, and continuous aeration and ventilation are performed during the aerobic composting process, and the aeration rate of the aeration and ventilation is 0.10 to 0.30 L·min -1 kg -1 .

[0013] Preferably, the compost is turned during the aerobic composting process and the lost water is replenished during the turning process to ensure that the water content of the mixed material is 55wt.% to 65wt.%.

[0014] Preferably, the agricultural organic waste includes crop straws, and the length of the crop straws is 2 to 3 cm; the vegetable diseased and residual plants include vegetable diseased and residual plant powder, and the particle size of the vegetable diseased and residual plant powder is 14 to 16 mm.

[0015] The present invention also provides the use of the organic fertilizer prepared by the method described in the above technical solution in promoting plant growth and / or improving plant disease resistance.

[0016] Preferably, the promoting plant growth comprises increasing one or more of the above-ground fresh weight, underground fresh weight, root length and plant height of the plant; and the improving the disease resistance of the plant comprises improving the ability of the plant to resist soil-borne diseases.

[0017] Beneficial effects:

[0018] The present invention provides a method for preparing organic fertilizer with diseased and damaged vegetable plants, comprising the following steps: mixing diseased and damaged vegetable plants with agricultural organic waste to obtain a mixed material; and aerobic composting after adjusting the water content of the mixed material to 55-65% to obtain organic fertilizer. The present invention can optimize the composition structure of microorganisms in the raw material through the aerobic composting process, so that more non-pathogenic microorganisms are enriched in the organic fertilizer. The increase of non-pathogenic microorganisms inhibits the reproduction of pathogenic bacteria, reduces the composition of pathogenic bacteria in the organic fertilizer, and produces an organic fertilizer product with disease inhibition and growth promotion effects. The method of the present invention not only contributes to the sustainable management of vegetable waste, but also solves the contradiction between existing diseased and damaged vegetable plants and soil-borne diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.

[0020] Figure 1The experimental results of potted plant growth of organic fertilizers of Example 1 and Comparative Example 1, wherein different letters indicate significant differences P < 0.05;

[0021] Figure 2 The changes of soil physical and chemical indexes of each group after the application of organic fertilizers in Example 1 and Comparative Example 1, where different letters indicate significant differences (P<0.05);

[0022] Figure 3 The following are the experimental results of the potted plant disease incidence of the organic fertilizers of Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0023] The present invention provides a method for preparing organic fertilizer from diseased and damaged vegetable plants, comprising the following steps:

[0024] Mixing diseased and damaged vegetable plants with agricultural organic waste to obtain a mixed material;

[0025] The water content of the mixed material is adjusted to 55wt.% to 65wt.% and then aerobic composting is performed to obtain organic fertilizer.

[0026] The present invention mixes vegetable diseased plants with agricultural organic waste to obtain a mixed material. As an embodiment, the vegetable diseased plants of the present invention may be, but are not limited to, vegetable diseased plants carrying Fusarium oxysporum. The present invention does not specifically limit the amount of Fusarium oxysporum carried in the vegetable diseased plants carrying Fusarium oxysporum, and a conventional selection may be sufficient; in a specific embodiment, the effective concentration of Fusarium oxysporum in the vegetable diseased plants carrying Fusarium oxysporum may be 10 9 CFU / g. As an embodiment, the vegetables of the present invention include but are not limited to cucumbers.

[0027] As an embodiment, the vegetable diseased and residual plants of the present invention can be vegetable diseased and residual plants powder; as an embodiment, the particle size of the vegetable diseased and residual plants powder can be 14-16 mm; as another embodiment, the particle size of the vegetable diseased and residual plants powder can be 15 mm. In the present invention, the particle size of the vegetable diseased and residual plants powder is within the range of 14-16 mm, which has the following advantages: 1. Air permeability and water permeability: the vegetable diseased and residual plants powder with a particle size of 14-16 mm can ensure good air permeability and water permeability during composting, promote aerobic decomposition activities of microorganisms, and prevent anaerobic conditions from occurring during composting; 2. Decomposition rate: the particle size range of 14-16 mm provides sufficient surface area for contact with microorganisms, while also avoiding agglomeration caused by too small particle size and material compaction during composting; 3. Structural stability: larger powder particle size helps to maintain the stability of the pile structure in the compost, and is not easy to be too densely stacked, which can provide a better growth environment for microorganisms, and is conducive to the reproduction and function of beneficial microorganisms such as biocontrol bacteria. 4. Economic and convenient operation: The particle size of 14-16 mm is easy to obtain through conventional crushing equipment, which is relatively simple to operate and can reduce production costs. At the same time, the moderate particle size can also reduce the generation of dust, which is conducive to the maintenance of the production environment.

[0028] As an embodiment, the carbon-nitrogen mass ratio of the mixed material of the present invention can be 18 to 25: 1; as another embodiment, the carbon-nitrogen mass ratio of the mixed material can be 20: 1. In the present invention, controlling the carbon-nitrogen mass ratio in the mixed material within the range of 18 to 25: 1 has the advantages of promoting microbial activity, preventing compost acidification, improving the quality of compost products, and inhibiting ammonia volatilization.

[0029] As an embodiment, the agricultural organic waste of the present invention may be crop straw; as another embodiment, the crop straw includes but is not limited to wheat straw. As an embodiment, the length of the crop straw of the present invention may be 2 to 3 cm.

[0030] After obtaining the mixed material, the present invention adjusts the water content of the mixed material to 55wt.% to 65wt.% and then performs aerobic composting to obtain organic fertilizer. As an embodiment, the water content of the mixed material of the present invention can be 60wt.% to 63wt.%. The present invention adjusts the water content of the mixed material to 55wt.% to 65wt.% to provide an ideal biological and physical environment for composting, ensures that the composting process is carried out efficiently, and obtains the advantage of high-quality organic fertilizer products.

[0031] As an embodiment, the present invention further comprises adjusting the filling bulk density of the mixture to 0.20-0.60 kg / L after adjusting the water content of the mixture to 55 wt.%-65 wt.%; as another embodiment, the filling bulk density of the mixture can be 0.35 kg / L. The present invention adjusts the filling bulk density to optimize the aerobic conditions, temperature management, physical structure and water balance in the subsequent composting process, thereby improving the efficiency of composting and the quality of the final organic fertilizer, and when the bulk density is 0.35 kg / L, it is more conducive to increasing the energy density generated by the degradation of materials per unit volume, increasing the fermentation temperature, and shortening the fermentation cycle.

[0032] As an embodiment, the aerobic composting time of the present invention can be 16 to 28 days; as another embodiment, the aerobic composting time can be 18 days. As an embodiment, the aerobic composting of the present invention can be carried out in a composting reactor. The present invention does not specifically limit the specifications and sources of the composting reactor, and a conventional composting reactor in the art can be used. As an embodiment, continuous aeration and ventilation are performed during the aerobic composting process of the present invention, and the aeration volume of the aeration and ventilation can be 0.10 to 0.30 L·min -1 kg -1 As another embodiment, the aeration rate of the aeration ventilation can be 0.2L·min -1 kg -1 As an embodiment, during the aerobic composting process of the present invention, the compost is turned and the lost water is replenished during the turning process to ensure that the moisture content of the mixed material is 55wt.% to 65wt.%. The present invention has no special limitation on the frequency of turning the compost, and those skilled in the art can adjust it according to the temperature, water content, material type and maturity of the compost. For example, in a specific embodiment of the present invention, the aerobic composting time is 18 days, and the turning time is the 0th, 3rd, 5th, 8th, 13th and 18th day of aerobic composting.

[0033] The method comprises the following steps: aerobic composting is performed after the diseased and damaged vegetable plants and agricultural organic waste are configured in a specific ratio, and the obtained organic fertilizer product increases the content of soil alkaline nitrogen, quick-acting potassium and organic matter, improves soil physical and chemical properties and microbial environment, and promotes crop growth.

[0034] The present invention can optimize the composition structure of microorganisms in the raw material through the process of aerobic composting, so that more non-pathogenic microorganisms are enriched in organic fertilizer. The increase of non-pathogenic microorganisms inhibits the reproduction of pathogens, reduces the composition of pathogens in organic fertilizer, and produces organic fertilizer products with disease inhibition and growth promotion effects. At the same time, the present invention makes vegetable diseased and damaged plants carrying pathogens, such as Fusarium oxysporum, resourceful, avoids the pollution of the environment by vegetable diseased and damaged plants, and improves their utilization value; by combining vegetable diseased and damaged plants with agricultural organic waste, more efficient organic fertilizer products can be produced, providing reliable support for sustainable agriculture.

[0035] Based on the above advantages, the present invention also provides the use of the organic fertilizer prepared by the method described in the above technical solution in promoting plant growth and / or improving the disease resistance of plants. As an embodiment, the promoting plant growth of the present invention may be to increase one or more of the aboveground fresh weight, underground fresh weight, root length and plant height of the plant; as another embodiment, the promoting plant growth may be to increase the plant height and / or root length of the plant. As an embodiment, the improving the disease resistance of plants may be to improve the ability of plants to resist soil-borne diseases; as another embodiment, the improving the ability of plants to resist soil-borne diseases may be to improve the ability to resist wilt.

[0036] In order to further illustrate the present invention, the technical solution provided by the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0037] Example 1

[0038] A method for preparing organic fertilizer from diseased and damaged vegetable plants, wherein the pathogenicity and phenotypic characteristics of the diseased and damaged cucumber plants are: Grade 4 disease, all leaves wilt or die, and the concentration of Fusarium oxysporum is 10 9 CFU / g.

[0039] The specific method for preparing organic fertilizer is as follows:

[0040] The cucumber diseased and damaged plants were crushed using a crusher to obtain cucumber diseased and damaged plant powder with a particle size of 15 mm;

[0041] Wheat straw with a length of 2 to 3 cm and cucumber diseased and damaged plant powder were mixed at a C / N mass ratio of 25:1, and the moisture content was adjusted to 65%. The filling density of the mixed material was set to 0.35 kg / L;

[0042] The mixed materials are placed in a fermentation barrel. The bottom of the fermentation barrel is equipped with an aeration system to continuously ventilate the pile at a ventilation rate of 0.2 L min. -1 kg -1The composting process lasts for 18 days, with the compost turned on days 0, 3, 5, 8, 13, and 18 to replenish lost water.

[0043] After the composting is completed, it is further stabilized and dried, and then screened and crushed to produce organic fertilizer.

[0044] Comparative Example 1

[0045] The method in Example 1 was used to prepare organic fertilizer, except that healthy cucumber plants were used in Comparative Example 1, rather than diseased and damaged cucumber plants.

[0046] Application Example 1

[0047] 1. The physical and chemical indicators of the organic fertilizer prepared in Example 1 and Comparative Example 1 were measured. The specific physical and chemical indicators included pH value, C / N mass ratio, E4 / E6, EC (μS·cm -1 )、GI(%)、NH 4+ -N / NO 3- -N and NH 4+ -N(g·kg -1 ), and the results are shown in Table 1.

[0048] Table 1 Physical and chemical index measurement results of organic fertilizer in Example 1 and Comparative Example 1

[0049] index Comparative Example 1 Example 1 Maturity Standard pH 8.40 7.92 5.5-8.5 C / N 16.04 18.32 10-20 E4 / E6 1.82 1.74 1.4-3.0 <![CDATA[EC(μS·cm -1 )]]> 2571 3401 <![CDATA[<4.0mS·cm -1 ]]> GI (%) 119.61 116.31 >80％

[0050] It can be concluded from Table 1 that at the end of the final composting, both Comparative Example 1 and Example 1 have reached the maturity standard. The method of this embodiment can effectively treat the diseased and damaged cucumber plants, thereby reaching the maturity standard of organic fertilizer.

[0051] 2. The organic fertilizers in Example 1 and Comparative Example 1 were used in a potted plant growth test, and the specific steps were as follows:

[0052] This experimental stage is divided into a blank group and a treatment group, among which,

[0053] Blank group: Add 10% of the potting soil weight of potting soil into the potting soil, where the potting soil is composed of 50% peat soil, 30% perlite and 20% garden soil, with a pH value between 6.5 and 8.0, which is within the optimal range of soil microbial activity and can provide favorable conditions for plant growth;

[0054] Treatment group 1: adding 10% of the weight of potting soil to the organic fertilizer in comparative example 1;

[0055] Treatment group 2: adding 10% of the weight of potting soil to the organic fertilizer in Example 1;

[0056] Each treatment was repeated five times.

[0057] The test method for potted plant growth is as follows:

[0058] 1) The surface of cucumber seeds was sterilized by soaking in 75% (v / v) ethanol solution and 1% sodium hypochlorite in turn. The specific method of sterilization is: soak the cucumber seeds in 75% ethanol solution for 1-2 minutes to kill surface bacteria, and then rinse with sterile water. Next, soak the seeds in 1% sodium hypochlorite solution for 5-10 minutes, and then rinse with sterile water to remove the sodium hypochlorite residue. The sterilized cucumber seeds were sown in a plug tray and covered with a layer of soil.

[0059] The potting soil was divided into plastic flower pots, with each flower pot containing about 400 g of potting soil. According to the above test grouping treatment, 10% of the total weight of the potting soil or organic fertilizer was added to the flower pots and mixed with the soil.

[0060] 2) After the cucumber seedlings in the seedling trays grew to two leaves and one heart, they were transplanted into flower pots. The pot experiment lasted for 20 days.

[0061] The plants in each treatment group grew well. The plants in treatment group 2, to which the organic fertilizer in Example 1 was applied, showed no symptoms or trends of wilt disease, such as leaf wilting and plant death, indicating that composting of diseased and damaged plants is safe.

[0062] The underground fresh weight, plant height, root length and aboveground fresh weight of the potted cucumbers in the blank group, treatment group 1 and treatment group 2 were measured. Figure 1 shown.

[0063] Depend on Figure 1 It can be concluded that the difference in the fresh weight of the underground part of each group is small, among which the fresh weight of the underground part of the cucumber seedlings in the blank group, treatment group 1 and treatment group 2 are 5.99g, 6.49g and 7.85g, respectively, and there is no significant difference among the three. There are significant differences in the plant height of each group, among which the blank group, treatment group 1 and treatment group 2 are 6.11cm, 8.3cm and 9.4cm, respectively. The plant height of treatment group 1 is 35.8% higher than that of the blank group, and the plant height of treatment group 2 is 53.8% higher than that of the blank group. The root length of the blank group, treatment group 1 and treatment group 2 are 1865.21cm, 1222.50cm and 1985.11cm, respectively, among which treatment group 2 is significantly higher than treatment group 1. The aboveground fresh weights of the blank group, treatment group 1 and treatment group 2 were 5.51g, 9.72g and 11.87g, respectively. The aboveground fresh weights of the blank group were the lowest. The aboveground fresh weights of treatment groups 1 and 2 were significantly increased by 76.4% and 115.4% respectively compared with the blank group.

[0064] Based on the above results, it can be seen that the application of organic fertilizer can increase the aboveground fresh weight, underground fresh weight and plant height of the plant, indicating that the application of organic fertilizer has a certain effect on plant growth, which may be because organic fertilizer is rich in microorganisms and nutrients, which can promote plant growth. Among them, the effect of organic fertilizer on the aboveground fresh weight and plant height is the most significant, and the aboveground fresh weight, underground fresh weight, root length and plant height of the organic fertilizer applied in Example 1 are the highest among the three treatments, among which the root length and plant height of the organic fertilizer treatment in Example 1 are significantly higher than those of the healthy plant compost, and the aboveground fresh weight and underground fresh weight are slightly higher than those of the healthy plant compost, indicating that compared with the healthy plant compost, the diseased and disabled plant compost has a better effect on plant growth.

[0065] 3. The soil physical and chemical indicators of each group in the potted plant growth experiment were measured. The specific physical and chemical indicators included alkaline nitrogen, available potassium, and organic matter. The results are as follows: Figure 2 shown.

[0066] Depend on Figure 2 It can be concluded that the addition of compost in each treatment group can increase the nutrient content in the soil. The alkaline nitrogen content of each group was 191.37 mg / kg, 216.95 mg / kg, and 218.37 mg / kg, respectively. Compared with the blank group, the alkaline nitrogen content of the soil in treatment group 1 and treatment group 2 increased by 13% and 14%; the available potassium content of each treatment was 0.98 g / kg, 2.02 g / kg, and 2.57 g / kg, respectively. Compared with the blank group, the available potassium content of the soil in treatment group 1 and treatment group 2 increased by 104% and 158%, respectively, and treatment group 2 was significantly higher than treatment group 1; the soil organic matter content of each treatment was 225.21 g / kg, 248.99 g / kg, and 292.41 g / kg, respectively. The soil organic matter content in treatment group 1 was slightly higher than that in the blank group but there was no significant difference, and treatment group 2 was significantly higher than the blank group. The content of alkaline nitrogen, available potassium and organic matter in the soil is the main indicator for evaluating the nutrient content of soil, which will affect soil health and plant growth. The application of compost can improve soil nutrients and has a greater impact on the available phosphorus and available potassium in the soil. Compared with healthy plants, compost of diseased and damaged plants can increase the content of alkaline nitrogen, available potassium and organic matter in the soil.

[0067] Based on the above results, it can be seen that the present invention configures vegetable diseased and damaged plants and agricultural organic waste in a specific ratio and then performs aerobic composting. The obtained organic fertilizer product can increase the content of soil alkaline nitrogen, quick-acting potassium, and organic matter, improve the physical and chemical properties of the soil, and has a better effect in promoting crop growth.

[0068] Application Example 2

[0069] The organic fertilizer prepared in Example 1 was applied to the potted plant disease experiment, and the specific design was as follows:

[0070] This experimental stage is divided into blank group, pathogen group and treatment group:

[0071] The blank group refers to normal potted plants without any fertilizer or pathogen suspension;

[0072] The pathogen group refers to the potted plants to which the pathogen suspension was applied, and the pathogen suspension was applied at 30% of the weight of the potted soil, wherein the pathogen suspension was Fusarium oxysporum suspension, and the effective concentration was 10 9 CFU / g, Fusarium oxysporum is distributed in potato dextrose broth PDB culture liquid (potato extract powder 3.0g / L, glucose 20.0g / L).

[0073] Treatment group 1 refers to the application of pathogen suspension and organic fertilizer prepared in comparative example 1, where 30% of the pathogen suspension (same pathogen group) and 10% of the organic fertilizer by weight of the potting soil are added to the potting soil;

[0074] Treatment group 2 refers to the application of pathogen suspension and organic fertilizer prepared in Example 1, where 30% of the weight of the pathogen suspension (same pathogen group) and 10% of the weight of the organic fertilizer were added to the potting soil;

[0075] Each treatment was repeated five times.

[0076] The experimental method for the disease occurrence of potted plants is as follows:

[0077] 1) The surface of cucumber seeds was sterilized by soaking in 75% (v / v) ethanol solution and 1% sodium hypochlorite in sequence (the specific process is the same as in Application Example 1), and then rinsed with sterile water. The sterilized cucumber seeds were sown in a plug tray and covered with a layer of soil.

[0078] The potting soil was divided into plastic pots, each plastic pot containing about 400 g of potting soil, and pathogen suspension and organic fertilizer were added according to the above grouping treatment, and mixed with the potting soil. The pathogen spore suspension was added by root injury perfusion method.

[0079] 2) When the cucumber seedlings in the seedling tray grow to two leaves and one heart, transplant them into flower pots. Observe the growth and disease of the plants. When all the plants in the pathogen group are diseased, measure the disease index of each treatment.

[0080] The results of the potted plant disease experiment are as follows Figure 3As shown. The disease is divided into 0 to 4 levels according to the severity, the higher the level, the more serious the disease, and 0 represents no disease. All plants in the blank group were graded as 0, and all plants in the pathogen group were sick, of which 11% were graded as 1, 33% were graded as 2, 33% were graded as 3, and 22% were graded as 4. The overall disease was serious; the overall disease level of the treatment groups with organic fertilizer (treatment group 1 and treatment group 2) was significantly lower than that of the pathogen group, of which 33% of the plants in treatment group 1 were not sick, and more than half (67%) of the plants in treatment group 2 were not sick, indicating that the addition of organic fertilizer can inhibit the occurrence of the disease, and most of the treatment group 1 had a mild disease, of which 56% were graded as 1, 11% were graded as 2, and there were no plants with grade 3 or 4 diseases. Treatment group 2 had only plants with grade 1 disease (33%). In comparison, the number of plants without disease in treatment group 2 was 34% higher than that in treatment group 1, and the number of plants with grade 1 disease was reduced by 23%.

[0081] Based on the results of the wilt disease index of cucumber plants treated with the above-mentioned methods, it can be obtained that the addition of organic fertilizer has a good disease inhibition effect, and the organic fertilizer prepared with diseased and damaged plants in Example 1 can also reduce the severity of the disease. Compared with the organic fertilizer prepared with healthy plants in Comparative Example 1, the organic fertilizer prepared with diseased and damaged plants in Example 1 enhances the disease inhibition and biological control effect, and the disease inhibition and control effect is increased by 17%.

[0082] It can be concluded from the above embodiments that the composition structure of microorganisms in the raw materials can be optimized in the aerobic composting process in the method of the present invention, so that more non-pathogenic microorganisms can be enriched in the organic fertilizer, thereby inhibiting the reproduction of pathogenic bacteria and producing an organic fertilizer product with disease inhibition and growth promotion effects.

[0083] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for preparing organic fertilizer from diseased and damaged vegetable plants, characterized in that: The steps include: Mixing diseased and damaged vegetable plants with agricultural organic waste to obtain a mixed material; The water content of the mixed material is adjusted to 55wt.% to 65wt.% and then aerobic composting is performed to obtain organic fertilizer.

2. The method according to claim 1, characterized in that The vegetable diseased and damaged plants include vegetable diseased and damaged plants carrying Fusarium oxysporum.

3. The method according to claim 2, characterized in that The vegetables include cucumbers.

4. The method according to any one of claims 1 to 3, characterized in that: The carbon-nitrogen mass ratio of the mixed material is 18-25:

1.

5. The method according to claim 1, characterized in that After adjusting the water content of the mixed material to 55wt.% to 65wt.%, the method further includes adjusting the filling density of the mixed material to 0.20 to 0.60kg / L.

6. The method according to claim 1, characterized in that The aerobic composting time is 16 to 28 days, and continuous aeration and ventilation are performed during the aerobic composting process, and the aeration volume of the aeration and ventilation is 0.10 to 0.30 L·min -1 kg -1 .

7. The method according to claim 1 or 6, characterized in that: During the aerobic composting process, the compost is turned and the lost water is replenished during the turning process to ensure that the water content of the mixed material is 55wt.% to 65wt.%.

8. The method according to claim 1, characterized in that The agricultural organic waste includes crop straws, and the length of the crop straws is 2 to 3 cm; the vegetable diseased and residual plants include vegetable diseased and residual plant powder, and the particle size of the vegetable diseased and residual plant powder is 14 to 16 mm.

9. Use of the organic fertilizer prepared by the method according to any one of claims 1 to 8 in promoting plant growth and / or improving plant disease resistance.

10. The use according to claim 9, characterized in that: The promoting of plant growth comprises increasing one or more of the above-ground fresh weight, underground fresh weight, root length and plant height of the plant; and the improving of plant disease resistance comprises improving the ability of the plant to resist soil-borne diseases.

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