Potato residue fermented organic fertilizer and preparation method thereof

Abstract

The invention relates to the technical field of fertilizer preparation, in particular to a potato residue fermented organic fertilizer and a preparation method thereof. The invention provides a potato residue fermented organic fertilizer. The potato residue fermented organic fertilizer is prepared from the following components in parts by mass: 150-200 parts of potato residues, 10-20 parts of bran, 4-6 parts of soybean meal, 4-6 parts of corn flour, 10-20 parts of furfural residues, 1-2 parts of a fermentation inoculant and 1-2 parts of a composite inoculant. The potato residue fermented organic fertilizer prepared by the invention not only can effectively promote the growth of crops and remarkably improve the yield and quality of potatoes, but also can activate soil, improve the contents of organic matters, nitrogen, phosphorus and potassium in the soil and improve the fertility of the soil, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer preparation, in particular to a potato residue fermented organic fertilizer and a preparation method thereof. Background Art

[0002] Among the food crops widely grown around the world, production efficiency and quality directly affect food safety and farmers' income, and are of great significance for ensuring food security and improving farmers' living standards.

[0003] Nowadays, unreasonable or excessive fertilizer application may lead to soil quality degradation, environmental pollution, and crop yield and quality decline. Strengthening and improving the treatment of pollutants and improving the efficiency of pollutant resource utilization are urgent issues to be solved in the development of green industries. Using composting technology to produce organic fertilizer can achieve harmless treatment and resource utilization of potato residues more quickly.

[0004] In the potato processing process, in order to extract starch or make potato chips, multiple steps such as washing, peeling, slicing, and soaking are required. The waste generated in these steps is mainly the potato skin, fragments, and starch that cannot be completely extracted, which together constitute potato residue. Although these wastes contain certain nutrients, the proportion is unbalanced and difficult to use directly. Processing potato residue into efficient organic fertilizer required for agricultural production can not only utilize waste, but also reduce the use of chemical fertilizers in agricultural production, reduce the negative impact of chemical fertilizers on soil and crops, and increase the yield and safety of agricultural products.

[0005] Although the production of organic fertilizer is the main mode of harmless treatment and resource utilization of potato residue, the lack of mature supporting technology in organic fertilizer production has resulted in uneven treatment effects. Aerobic composting of potato residue still has problems such as high moisture content, insufficient fermentation, and low nutrient content. Therefore, how to make full use of the surplus value of potato residue and further process it into organic fertilizer with rich nutrient content and high fertilizer efficiency is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] The invention aims to provide a potato residue fermented organic fertilizer and a preparation method thereof.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The invention provides a potato residue fermented organic fertilizer, which is prepared from the following components in parts by weight: 150-200 parts of potato residue, 10-20 parts of bran, 4-6 parts of soybean meal, 4-6 parts of cornmeal, 10-20 parts of furfural residue, 1-2 parts of fermentation bacteria agent, and 1-2 parts of composite bacteria agent; the fermentation bacteria agent comprises: Bacillus subtilis, Lactobacillus mansoni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride; the composite bacteria agent comprises: Bacillus cereus, Paenibacillus alvei, Spore-Lactobacillus inulinus and Pseudoalteromonas.

[0009] Preferably, the bacterial content of Bacillus subtilis, Lactobacillus mansoni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation bacteria agent is 200-400 million / mL.

[0010] Preferably, the bacterial content of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 300-500 million / mL.

[0011] Preferably, the volume ratio of Bacillus subtilis, Lactobacillus reiterii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation bacteria agent is 20-26:18-24:15-19:7-13:4-6.

[0012] Preferably, the volume ratio of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 12-16:10-14:6-10:5-9.

[0013] The present invention also provides a method for preparing the organic fertilizer, comprising the following steps:

[0014] (1) Mixing potato residue, bran, soybean meal, cornmeal, furfural residue and fermentation agent, adjusting the water content and then composting;

[0015] (2) The composted material obtained in step (1) is mixed with a composite bacterial agent for fermentation, and after aging, a potato residue fermented organic fertilizer is obtained.

[0016] Preferably, in step (1), the water content is adjusted to 60-65%.

[0017] Preferably, the composting time in step (1) is 15 to 20 days, and the compost is turned every 4 to 6 days.

[0018] Preferably, the fermentation time in step (2) is 7 to 10 days.

[0019] Preferably, the aging time in step (2) is 20 to 30 days.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Potato residue is a byproduct produced in the production process of potato starch. It has high water content, many self-contained bacteria, and is easy to spoil. However, it contains a large amount of available components such as cellulose, pectin, and crude protein, and has a high development and utilization value. Among the fermentation bacteria used in the present invention, Trichoderma harzianum and Trichoderma viride can effectively decompose the crude fiber in potato residue, and the use of capsule-coated yeast can decompose macromolecular proteins into small molecular proteins that can be directly utilized. Bacillus subtilis can decompose various organic substances, and Lactobacillus mansoni has the effect of activating the middle elements such as silicon, calcium, and magnesium in the fermentation material, and also has the function of decomposing phosphorus and potassium.

[0022] The composite bacterial agent used in the present invention can further decompose and utilize the fermented material, and its main function is that it can be applied to the soil as a probiotic strain, which can activate the soil and improve the fertilizer efficiency of the fertilizer. The Bacillus cereus and Lactobacillus inulinus added in the composite bacterial agent have the functions of solubilizing phosphorus and potassium, which can improve the soil fertilizer efficiency and reduce the amount of chemical fertilizer. Bacillus alvei and Pseudomonas have an antibacterial effect, have excellent control effects on a variety of plant pathogens, and can also enhance the stress resistance of crops.

[0023] The potato residue fermented organic fertilizer prepared by the present invention can not only effectively promote the growth of potatoes and significantly improve the yield and quality of potatoes, but also activate the soil, increase the content of organic matter and nitrogen, phosphorus and potassium in the soil, and improve the fertility of the soil, and has broad application prospects. DETAILED DESCRIPTION

[0024] The invention provides a potato residue fermented organic fertilizer, which is prepared by the following components in parts by weight: 150-200 parts of potato residue, 10-20 parts of bran, 4-6 parts of soybean meal, 4-6 parts of cornmeal, 10-20 parts of furfural residue, 1-2 parts of fermentation bacteria agent, and 1-2 parts of composite bacteria agent; preferably 160-190 parts of potato residue, 12-18 parts of bran, 5 parts of soybean meal, 5 parts of cornmeal, 12-1 8 parts, fermentation agent 1.5 parts, and compound agent 1.5 parts; further preferably, 170-180 parts of potato residue, 14-16 parts of bran, 5 parts of soybean meal, 5 parts of cornmeal, 14-16 parts of furfural residue, 1.5 parts of fermentation agent, and 1.5 parts of compound agent; more preferably, 175 parts of potato residue, 15 parts of bran, 5 parts of soybean meal, 5 parts of cornmeal, 15 parts of furfural residue, 1.5 parts of fermentation agent, and 1.5 parts of compound agent.

[0025] In the present invention, the fermentation agent includes: Bacillus subtilis, Lactobacillus leishmanni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride; the composite agent includes: Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas.

[0026] In the present invention, the bacterial content of Bacillus subtilis, Lactobacillus mansoni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation agent is 200-400 million / mL, preferably 300 million / mL.

[0027] In the present invention, the bacterial content of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 300-500 million / mL, preferably 400 million / mL.

[0028] In the present invention, the volume ratio of Bacillus subtilis, Lactobacillus reiterii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation bacteria agent is 20-26:18-24:15-19:7-13:4-6; preferably 21-25:19-23:16-18:8-12:5; further preferably 22-24:20-22:17:9-11:5; more preferably 23:21:17:10:5.

[0029] In the present invention, the volume ratio of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 12-16:10-14:6-10:5-9; preferably 13-15:11-13:7-9:6-8; further preferably 14:12:8:7.

[0030] The present invention also provides a method for preparing the organic fertilizer, comprising the following steps:

[0031] (1) Mixing potato residue, bran, soybean meal, cornmeal, furfural residue and fermentation agent, adjusting the water content and then composting;

[0032] (2) The composted material obtained in step (1) is mixed with a composite bacterial agent for fermentation, and after aging, a potato residue fermented organic fertilizer is obtained.

[0033] In the present invention, the water content in step (1) is adjusted to 60-65%, preferably 61-64%, more preferably 62-63%, and more preferably 62%.

[0034] In the present invention, the composting time in step (1) is 15 to 20 days, and the pile is turned every 4 to 6 days; preferably, the composting time is 16 to 19 days, and the pile is turned every 5 days; more preferably, the composting time is 17 to 18 days, and the pile is turned every 5 days; more preferably, the composting time is 18 days, and the pile is turned every 5 days.

[0035] In the present invention, the fermentation time in step (2) is 7 to 10 days, preferably 8 to 9 days, and more preferably 9 days.

[0036] In the present invention, the aging time in step (2) is 20 to 30 days; preferably 22 to 28 days; more preferably 24 to 26 days; and more preferably 25 days.

[0037] In the present invention, the bacterial species are Bacillus subtilis (Mingzhou Bio B12039), Lactobacillus mansoni (ATCC7830), Saccharomyces cerevisiae (ATCC 32693), Trichoderma harzianum (Mingzhou Bio BMZ112200), Trichoderma viride (Mingzhou Bio BMZ127533), Bacillus cereus (Mingzhou Bio B81109), Paenibacillus alvei (Mingzhou Bio B94678), Sporolactobacillus inulinus (ATCC 15538) and Pseudomonas aeruginosa (NCCB 100134).

[0038] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0039] Example 1

[0040] A method for preparing potato residue fermented organic fertilizer, comprising the following steps:

[0041] (1) 150 kg of potato residue, 10 kg of bran, 4 kg of soybean meal, 4 kg of cornmeal, and 10 kg of furfural residue are stirred evenly with a turning and tumbling vehicle, and then tumbled and oxygenated to obtain a fermentation base material.

[0042] (2) Add 1 kg of brown sugar to 55 L of room temperature water, add 1.2 kg of salt and 1.2 kg of urea, heat and boil to remove bacteria, and when the temperature drops to 37°C, put it into a fermentation barrel for later use.

[0043] (3) Divide the brown sugar water obtained in step (2) into 9 portions, inoculate Bacillus subtilis, Lactobacillus leishmanni, Saccharomyces cerevisiae, Trichoderma harzianum, Trichoderma viride, Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas in a volume ratio of 4.5%, stir evenly, seal, place in a culture chamber, control the temperature of the culture chamber at 25±2° C., and culture for 24 hours.

[0044] (4) The Bacillus subtilis, Lactobacillus reimanii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride obtained in step (3) are mixed to obtain a fermentation agent, wherein the volume ratio of Bacillus subtilis, Lactobacillus reimanii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation agent is 20:18:15:7:4; and the bacterial content is 200 million / mL.

[0045] (5) The Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas obtained in step (3) are mixed to obtain a composite bacterial agent, wherein the volume ratio of Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 12:10:6:5, and the bacterial content of each of the composite bacterial agent is 300 million / mL.

[0046] (6) Mix the fermentation base material and 1 kg of fermentation agent, adjust the moisture content to 60%, and compost for 15 days, turning the pile every 4 days;

[0047] (7) The composted material obtained in step (6) was mixed with 1 kg of a composite bacterial agent and fermented for 7 days. After aging for 20 days, a potato residue fermented organic fertilizer was obtained.

[0048] Example 2

[0049] A method for preparing potato residue fermented organic fertilizer, comprising the following steps:

[0050] (1) 200 kg of potato residue, 20 kg of bran, 6 kg of soybean meal, 6 kg of cornmeal, and 20 kg of furfural residue are uniformly stirred with a turning and tumbling vehicle, and then tumbled and oxygenated to obtain a fermentation base material.

[0051] (2) Add 1 kg of brown sugar to 45 L of room temperature water, add 1 kg of salt and 1 kg of urea, heat and boil to remove bacteria, and when the temperature drops to 37°C, put it into a fermentation barrel for later use.

[0052] (3) The brown sugar water obtained in step (2) is divided into 9 portions, and Bacillus subtilis, Lactobacillus leishmanni, Saccharomyces cerevisiae, Trichoderma harzianum, Trichoderma viride, Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas are inoculated respectively at a volume ratio of 3.6%, stirred evenly, sealed, and placed in a culture chamber, the temperature of the culture chamber is controlled at 25±2° C., and cultured for 24 hours.

[0053] (4) The Bacillus subtilis, Lactobacillus reiterii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride obtained in step (3) are mixed to obtain a fermentation agent, wherein the volume ratio of Bacillus subtilis, Lactobacillus reiterii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation agent is 26:24:19:13:6; and the bacterial content is 400 million / mL.

[0054] (5) The Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas obtained in step (3) are mixed to obtain a composite bacterial agent, wherein the volume ratio of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 16:14:10:9, and the bacterial content of each of the composite bacterial agent is 500 million / mL.

[0055] (6) Mix the fermentation base material and 2 kg of fermentation agent, adjust the moisture content to 65%, and compost for 20 days, turning the pile every 6 days;

[0056] (7) The composted material obtained in step (6) was mixed with 2 kg of a composite bacterial agent and fermented for 10 days. After aging for 30 days, a potato residue fermented organic fertilizer was obtained.

[0057] Example 3

[0058] A method for preparing potato residue fermented organic fertilizer, comprising the following steps:

[0059] (1) 185 kg of potato residue, 15 kg of bran, 5 kg of soybean meal, 5 kg of cornmeal, and 15 kg of furfural residue were stirred evenly with a turning and tumbling vehicle, and then tumbled and oxygenated to obtain a fermentation base material.

[0060] (2) Add 1 kg of brown sugar to 50 L of room temperature water, add 1 kg of salt and 1 kg of urea, heat and boil to remove bacteria, and when the temperature drops to 37°C, put it into a fermentation barrel for later use.

[0061] (3) The brown sugar water obtained in step (2) is divided into 9 portions, and Bacillus subtilis, Lactobacillus leishmanni, Saccharomyces cerevisiae, Trichoderma harzianum, Trichoderma viride, Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas are inoculated into the portions at a volume ratio of 4%, respectively, and the portions are stirred evenly, sealed, and placed in a culture chamber, the temperature of the culture chamber is controlled at 25±2° C., and cultured for 24 hours.

[0062] (4) The Bacillus subtilis, Lactobacillus reimanii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride obtained in step (3) are mixed to obtain a fermentation agent, wherein the volume ratio of Bacillus subtilis, Lactobacillus reimanii, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation agent is 23:21:17:11:5; and the bacterial content is 300 million / mL.

[0063] (5) The Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas obtained in step (3) are mixed to obtain a composite bacterial agent, wherein the volume ratio of Bacillus cereus, Paenibacillus alvei, Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent is 14:12:8:7, and the bacterial content of each of the composite bacterial agent is 400 million / mL.

[0064] (6) Mix the fermentation base material and 1.5 kg of fermentation agent, adjust the moisture content to 60%, and compost for 18 days, turning the pile every 5 days;

[0065] (7) The composted material obtained in step (6) was mixed with 1.5 kg of a composite bacterial agent and fermented for 8 days. After aging for 25 days, a potato residue fermented organic fertilizer was obtained.

[0066] Experimental Example 1

[0067] A potato planting experiment was conducted in a potato planting field in Aksu area of ​​Xinjiang Uygur Autonomous Region, and the potato variety selected was Xinjiang Shu No. 2.

[0068] Among them, the potato residue fermented organic fertilizer obtained by the method of Example 3 was used as the experimental group;

[0069] Control group 1, other methods are the same as Example 3, the only difference is that the composite bacterial agent is replaced by an equal amount of garden soil.

[0070] In control group 2, other methods were the same as those in Example 3, except that the Lactobacillus mansoni and Saccharomyces cerevisiae in the fermentation bacteria were replaced with equal amounts of Bacillus megaterium and Saccharomyces cerevisiae.

[0071] Control group 3, other methods are the same as those of Example 3, except that the alveolar Bacillus and inulinus sporolactobacillus in the composite bacterial agent are replaced by equal amounts of Bacillus megaterium and Lactobacillus acidophilus.

[0072] Control group 4, other methods are the same as Example 3, the only difference is that in step (6), the fermentation base material, 1.5 kg of fermentation agent and 1.5 kg of composite agent are mixed, the water content is adjusted to 60%, and then composted for 18 days, and the compost is turned every 5 days; after aging for 25 days, the potato residue fermented organic fertilizer is obtained without undergoing a secondary fermentation process. The total amount of fertilizer applied in the experimental group and the control groups 1 to 4 is 600 kg / mu.

[0073] Existing technology group: the total amount of fertilizer applied is 100kg / mu, and the mass ratio between nitrogen, phosphorus and potassium is 3:2:2.

[0074] Each experimental group treated three plots, selected 25±7g tubers, and planted them in high ridges with double rows covered with film. 1 / 2 of the total fertilizer was used as base fertilizer. After digging a furrow in the middle of the sowing ridge, the fertilizer was spread in the furrow, covered with soil and planted in ridges. Topdressing was applied once after the emergence of potatoes and before flowering. The amount of topdressing each time was 1 / 4 of the total fertilizer. Other field management measures were the same as those in the field. Except for the different fertilizers used, other growth management methods were the same for each experimental group.

[0075] After the potato harvest, 5 plants were randomly selected from each plot to investigate the weight of individual tubers and tubers per plant in each experimental group, and to determine the content of dry matter, starch, soluble protein and reducing sugar in the tubers. Finally, the yield per mu of each plot was investigated, and all data were averaged. The results are shown in Tables 1 and 2.

[0076] Among them, the dry matter content was determined by using the water specific gravity method; the starch content was determined by using the polarimetry; the soluble protein content was determined by the Coomassie brilliant blue method; and the reducing sugar content was determined by the direct titration method.

[0077] Table 1 Production data survey form

[0078] Group Single tuber weight g Single tuber weight g Yield per mu kg / mu Experimental Group 192.7 573.3 3675.8 Control group 1 168.2 522.8 2901.4 Control group 2 184.9 564.5 3314.2 Control group 3 179.6 558.3 3123.0 Control group 4 171.8 526.7 2989.6 Existing Technology Group 153.7 438.4 2789.7

[0079] Table 2 Quality data survey form

[0080]

[0081] It is not difficult to see from the contents recorded in Table 1 and Table 2 that the organic fertilizer provided by the present invention can significantly increase the yield and agronomic traits of potatoes, and improve the quality of potatoes, and the use effect of the fertilizer is significantly better than that of the prior art group and other control groups.

[0082] From the data of control groups 1 to 3, it can be seen that if some strains are abandoned or replaced, the effect of organic fertilizer will be significantly affected. From the data of control group 4, it can also be seen that only by using fermentation agents and compound agents separately and performing two-stage fermentation can the best technical effect be achieved. If all strains are directly mixed and fermented, the fertilizer efficiency of organic fertilizer will be greatly reduced.

[0083] Experimental Example 2

[0084] When the potatoes of each test group in Example 1 grew to the tuber stage, soil samples were taken from each plot, and the physical and chemical properties of the soil samples were measured three times and the average value was taken. The results are shown in Table 3.

[0085] Among them, the method for determining the soil organic matter content adopts the potassium dichromate volumetric method; the method for determining the soil hydrolyzable nitrogen content adopts the Kjeldahl nitrogen determination method; the method for determining the soil effective phosphorus content adopts the sodium bicarbonate method; and the method for determining the soil available potassium content adopts the flame photometer method.

[0086] Table 3 Survey table of soil sample physical and chemical properties

[0087]

[0088] As shown in Table 3, the organic fertilizer provided by the present invention can significantly improve the content of organic matter in the soil, and improve the ratio of nitrogen, phosphorus and potassium in the soil, relative to the prior art group, and has the best effect on the content of hydrolyzed nitrogen in the soil, and can provide a strong nitrogen supply and nutritional guarantee for the growth of potatoes. It can also be seen from the data of the control group that the use of different strains or the different settings of the fermentation method will also indirectly affect the content of nutrients in the soil, and then have a significant impact on the growth of potatoes.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A potato residue fermented organic fertilizer, characterized in that: The invention is prepared by comprising the following components in parts by weight: 150-200 parts of potato residue, 10-20 parts of bran, 4-6 parts of soybean meal, 4-6 parts of cornmeal, 10-20 parts of furfural residue, 1-2 parts of fermentation bacterial agent, and 1-2 parts of composite bacterial agent; The fermentation bacterial agent comprises: Bacillus subtilis, Lactobacillus leishmanni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride; the composite bacterial agent comprises: Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas.

2. The organic fertilizer according to claim 1, wherein The bacterial contents of Bacillus subtilis, Lactobacillus mansoni, Saccharomyces cerevisiae, Trichoderma harzianum and Trichoderma viride in the fermentation bacterial agent are all 200-400 million / mL.

3. The organic fertilizer according to claim 1, wherein The bacterial contents of Bacillus cereus, Paenibacillus alvei, Spore Lactobacillus inulinus and Pseudoalteromonas in the composite bacterial agent are all 300 million to 500 million per mL.

4. The organic fertilizer according to claim 1, characterized in that The volume ratio of bacillus subtilis, lactobacillus leishmanni, saccharomyces cerevisiae, trichoderma harzianum and trichoderma viride in the fermentation bacterial agent is 20-26:18-24:15-19:7-13:4-6.

5. The organic fertilizer according to claim 1, characterized in that The volume ratio of bacillus cereus, bacillus alvei, lactobacillus inulinus and pseudoalteromonas in the composite bacterial agent is 12-16:10-14:6-10:5-9.

6. The method for preparing an organic fertilizer according to any one of claims 1 to 5, characterized in that: The steps include: (1) Mixing potato residue, bran, soybean meal, cornmeal, furfural residue and fermentation agent, adjusting the water content and then composting; (2) The composted material obtained in step (1) is mixed with a composite bacterial agent for fermentation, and after aging, a potato residue fermented organic fertilizer is obtained.

7. The preparation method according to claim 6, characterized in that: In step (1), the water content is adjusted to 60-65%.

8. The preparation method according to claim 6, characterized in that: The composting time in step (1) is 15 to 20 days, and the compost is turned every 4 to 6 days.

9. The preparation method according to claim 6, characterized in that: The fermentation time in step (2) is 7 to 10 days.

10. The preparation method according to claim 6, characterized in that: The aging time in step (2) is 20 to 30 days.

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