CN114539003A - Dry land soil microbial diversity targeted regulating agent and preparation method and application thereof - Google Patents
Dry land soil microbial diversity targeted regulating agent and preparation method and application thereof Download PDFInfo
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- CN114539003A CN114539003A CN202210218822.1A CN202210218822A CN114539003A CN 114539003 A CN114539003 A CN 114539003A CN 202210218822 A CN202210218822 A CN 202210218822A CN 114539003 A CN114539003 A CN 114539003A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/45—Tobacco
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
- C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
Abstract
The invention relates to the technical field of soil conditioner preparation, in particular to a dry land soil microorganism diversity targeted regulating agent and a preparation method and application thereof. The special coating is prepared from the following components in parts by mass: 50-70 parts of organic fertilizer, 50-70 parts of carbon source, 40-60 parts of nitrogen source, 10-20 parts of fly ash, 10-20 parts of attapulgite, 3-7 parts of sodium chloride, 3-7 parts of dipotassium phosphate, 3-7 parts of ammonium sulfate and 1-3 parts of coating agent. The conditioner provided by the invention can improve the variety and the quantity of microorganisms in soil, and can change the variety of dominant flora in soil by adding different nitrogen sources, so that the variety of dominant flora can be changed according to different planting requirements.
Description
Technical Field
The invention relates to the technical field of soil conditioner preparation, in particular to a dry land soil microbial diversity targeted regulating agent and a preparation method and application thereof.
Background
The soil contains a large number of microorganisms including beneficial bacteria which have a growth promoting effect on crops. The beneficial bacteria can decompose organic matters in soil, increase granular structure of the soil and improve soil composition. The beneficial bacteria have very fast propagation speed in the soil, and are just like an invisible big net, which is complicated and complicated. After the thalli die, a plurality of fine pipelines are left in the soil, the fine pipelines not only increase the air permeability of the soil, but also enable the soil to become fluffy and soft, the nutrient and the moisture are not easy to lose, the water and fertilizer storage capacity of the soil is increased, and the hardening of the soil is avoided and eliminated. Beneficial bacteria can also inhibit the propagation of harmful bacteria, so that less pesticide is required to be applied, soil pests can be effectively inhibited, and the method is labor-saving, money-saving and pollution-free.
Therefore, the amount of beneficial bacteria in soil can be increased to improve the fertility of the soil, prevent the soil from hardening and the like, and a plurality of methods for increasing the amount of beneficial bacteria in the soil are recorded in the prior art, for example, CN201510126501.9 discloses a microbial phosphorus fertilizer which uses a carrier to adsorb beneficial bacteria and is applied to the soil to increase the amount of corresponding beneficial bacteria. However, due to factors such as external environment, the survival rate of the exogenous beneficial bacteria after being applied to soil is low, and the exogenous beneficial bacteria cannot be normally propagated. Therefore, the method has great technical difficulty and poor effect.
Therefore, the technical problem that the microbial fertilizer in the prior art is poor in fertilizer effect and cannot effectively improve the quantity of beneficial bacteria in soil is the problem that needs to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a dry land soil microbial diversity targeted regulating and controlling agent and a preparation method and application thereof, which improve the growth and propagation environment of microbial flora in dry land soil and improve the abundance of beneficial bacteria in soil by reasonably setting a nitrogen source and a carbon source.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a dry land soil microbial diversity targeted regulating agent which is prepared from the following components in parts by mass: 50-70 parts of organic fertilizer, 50-70 parts of carbon source, 40-60 parts of nitrogen source, 10-20 parts of fly ash, 10-20 parts of attapulgite, 3-7 parts of sodium chloride, 3-7 parts of dipotassium hydrogen phosphate, 3-7 parts of ammonium sulfate and 1-3 parts of coating agent.
Preferably, the carbon source is two or three of starch, molasses, glucose, sucrose, wheat bran, chicory residue, corn flour, sweet sorghum stalk powder and oil sand grass powder.
Preferably, the nitrogen source is one of soybean cake powder, peanut cake powder, cottonseed powder, fish meal and silkworm chrysalis powder.
Preferably, the mass ratio of the nitrogen, the phosphorus and the potassium in the organic fertilizer is 12-18: 10-16: 4-12.
Preferably, the coating agent is polyethylene oxide.
The invention also provides a preparation method of the dry land soil microbial diversity targeted regulator, which comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate to obtain material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a granulator.
Preferably, the step (1) of sieving after grinding is also included, wherein the sieving is to pass through a 120-140-mesh sieve, and the sieved component is collected to be the material 1.
Preferably, the granulator in the step (2) is a twin-screw extrusion granulator.
The invention further provides the dry land soil microbial diversity targeted regulating agent and application of the dry land soil microbial diversity targeted regulating agent prepared by the preparation method of the dry land soil microbial diversity targeted regulating agent in tobacco cultivation.
Compared with the prior art, the invention has the following beneficial effects:
1. the dry land soil microbial diversity targeted regulator can be used for replacing chemical fertilizers in crop growth and fertilization, and the using effect is superior to that of the fertilizers in the prior art.
2. The modifying agent provided by the invention not only can improve the variety and the quantity of microorganisms in soil, but also can change the variety of dominant flora in soil by adding and using different nitrogen sources, so that the variety of dominant flora can be changed according to different planting requirements.
Detailed Description
The invention provides a dry land soil microbial diversity targeted regulating agent which is prepared from the following components in parts by mass: 50-70 parts of organic fertilizer, 50-70 parts of carbon source, 40-60 parts of nitrogen source, 10-20 parts of fly ash, 10-20 parts of attapulgite, 3-7 parts of sodium chloride, 3-7 parts of dipotassium hydrogen phosphate, 3-7 parts of ammonium sulfate and 1-3 parts of coating agent;
the compound is preferably prepared from the following components in parts by mass: 54-66 parts of organic fertilizer, 54-66 parts of carbon source, 44-56 parts of nitrogen source, 12-18 parts of fly ash, 12-18 parts of attapulgite, 4-6 parts of sodium chloride, 4-6 parts of dipotassium hydrogen phosphate, 4-6 parts of ammonium sulfate and 2 parts of coating agent;
the composite material is further preferably prepared from the following components in parts by mass: 58-62 parts of organic fertilizer, 58-62 parts of carbon source, 48-52 parts of nitrogen source, 14-16 parts of fly ash, 14-16 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of coating agent;
more preferably, the composition is prepared from the following components in parts by mass: 60 parts of organic fertilizer, 60 parts of carbon source, 50 parts of nitrogen source, 15 parts of fly ash, 15 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of coating agent;
in the invention, the carbon source is two or three of starch, molasses, glucose, cane sugar, wheat bran, chicory residue, corn flour, sweet sorghum stalk powder and oil sand grass powder, and in the invention, different carbon source components are added according to the mass ratio.
In the invention, the nitrogen source is one of soybean cake powder, peanut cake powder, cottonseed powder, fish meal and silkworm chrysalis powder.
In the invention, the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 12-18: 10-16: 4-12; preferably 13-17: 11-15: 6-10; further preferably 14-16: 12-14: 7-9; more preferably 15: 13: 8.
In the invention, the coating agent is polyoxyethylene.
The invention also provides a preparation method of the dry land soil microbial diversity targeted regulator, which comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate to obtain material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a granulator.
In the invention, the step (1) of sieving after grinding is also included, wherein the sieving is to sieve through a 120-140-mesh sieve, and the sieved components are collected to be a material 1; preferably 124-136 meshes; further preferably 128 to 132 mesh; more preferably 130 mesh.
In the invention, the granulator in the step (2) is a double-screw extrusion granulator.
The twin-screw extrusion granulator of the present invention was purchased from Shiyu precision instruments Co., Ltd, Dongguan.
The invention further provides the application of the dry land soil microbial diversity targeted regulating agent prepared by the preparation method of the dry land soil microbial diversity targeted regulating agent in tobacco cultivation, wherein the dry land soil microbial diversity targeted regulating agent is used as a base fertilizer before tobacco transplanting and is used as an additional fertilizer for applying 40 days after the tobacco transplanting, and the dosage of each time is 100 kg/mu.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
The twin-screw extrusion granulator of the present invention was purchased from Shiyu precision instruments Co., Ltd, Dongguan.
Example 1
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 50 parts of organic fertilizer, 50 parts of carbon source, 40 parts of nitrogen source, 10 parts of fly ash, 10 parts of attapulgite, 3 parts of sodium chloride, 3 parts of dipotassium hydrogen phosphate, 3 parts of ammonium sulfate and 1 part of polyoxyethylene;
the carbon source is starch and oil sand grass powder, and the mass ratio of the starch to the oil sand grass powder is 1: 1; the nitrogen source is bean cake powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 12: 10: 4;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 120-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 2
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 70 parts of organic fertilizer, 70 parts of carbon source, 60 parts of nitrogen source, 20 parts of fly ash, 20 parts of attapulgite, 7 parts of sodium chloride, 7 parts of dipotassium hydrogen phosphate, 7 parts of ammonium sulfate and 3 parts of polyoxyethylene;
the carbon source comprises chicory slag, corn flour and sweet sorghum stalk powder, and the mass ratio of the chicory slag to the corn flour to the sweet sorghum stalk powder is 1: 1; the nitrogen source is silkworm chrysalis powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 18: 16: 12;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 140-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 3
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 60 parts of organic fertilizer, 60 parts of carbon source, 50 parts of nitrogen source, 15 parts of fly ash, 15 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of polyoxyethylene;
the carbon source is starch, molasses and wheat bran, and the mass ratio of the starch, the molasses and the wheat bran is 1: 1;
the nitrogen source is peanut cake powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 15: 13: 8;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 130-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 4
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 60 parts of organic fertilizer, 60 parts of carbon source, 50 parts of nitrogen source, 15 parts of fly ash, 15 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of polyoxyethylene;
the carbon source comprises chicory slag and corn flour, and the mass ratio of the chicory slag to the corn flour is 1: 1;
the nitrogen source is peanut cake powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 15: 13: 8;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 130-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 5
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 60 parts of organic fertilizer, 60 parts of carbon source, 50 parts of nitrogen source, 15 parts of fly ash, 15 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of polyoxyethylene;
the carbon source is starch, sweet sorghum stalk powder and oil sand grass powder, and the mass ratio of the starch to the sweet sorghum stalk powder to the oil sand grass powder is 1: 1;
the nitrogen source is peanut cake powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 15: 13: 8;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 130-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 6
A dry land soil microbial diversity targeted regulator is prepared from the following components in parts by mass: 60 parts of organic fertilizer, 60 parts of carbon source, 50 parts of nitrogen source, 15 parts of fly ash, 15 parts of attapulgite, 5 parts of sodium chloride, 5 parts of dipotassium hydrogen phosphate, 5 parts of ammonium sulfate and 2 parts of polyoxyethylene;
the carbon source is starch, glucose and sucrose, and the mass ratio of the starch to the glucose to the sucrose is 1: 1;
the nitrogen source is peanut cake powder;
the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 15: 13: 8;
the preparation method of the dry land soil microbial diversity targeted regulator comprises the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate, and sieving with a 130-mesh sieve to obtain a material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a double-screw extrusion granulator.
Example 7
And (3) comparison test: selecting a block with size of 1500m2The dry land (average annual precipitation amount is 258mm) is divided into 15 areas on average, and three areas are planted randomly in each test group.
Before the tobacco seedling plants are transplanted, the types and the quantity of microorganisms in the planting area are measured, dominant bacteria are detected, and the results are shown in table 1.
TABLE 1 measurement results before transplantation
Examples 3 to 6 were used as experimental groups 1 to 4, and applied as a base fertilizer before tobacco transplantation and as a top dressing 40 days after transplantation, each time using 100 kg/mu;
the control group was applied with conventional tobacco fertilizer (potassium sulfate type tobacco fertilizer 15-15-sanke fu, purchased from china-arabian chemical fertilizer limited), as base fertilizer after transplantation of tobacco and as top dressing at 40 days after transplantation, with the application amount according to the specification.
And (3) respectively measuring the types and the quantity of soil microorganisms 20 days and 60 days after the tobacco is transplanted, taking out the roots of the whole tobacco plant together with root soil, removing some large soil blocks at the roots, slightly shaking off the soil adhered to the fine roots, and uniformly mixing, wherein the soil is rhizosphere soil. The soil samples were stored after being mixed uniformly to determine the species and the number of rhizosphere soil microorganisms, and dominant bacteria were detected, with the results shown in tables 2 and 3.
TABLE 2 measurement results 20 days after transplantation
TABLE 3 measurement results 60 days after transplantation
As can be seen from the comparison of the data recorded in tables 1 to 3, the application of the dry land soil microbial diversity targeted regulator can obviously improve the number of microorganisms in the soil, and the using effect of the dry land soil microbial diversity targeted regulator is also obviously superior to that of the traditional fertilizer. The conditioner can also change the dominant flora in the soil, and the purpose of changing the dominant flora in the soil is achieved by changing the nitrogen source variety in the components, so that the dominant flora in the soil is changed due to the change of the components of the conditioner.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The dry land soil microbial diversity targeted regulating agent is characterized by being prepared from the following components in parts by mass: 50-70 parts of organic fertilizer, 50-70 parts of carbon source, 40-60 parts of nitrogen source, 10-20 parts of fly ash, 10-20 parts of attapulgite, 3-7 parts of sodium chloride, 3-7 parts of dipotassium hydrogen phosphate, 3-7 parts of ammonium sulfate and 1-3 parts of coating agent.
2. The dry land soil microorganism diversity targeted regulator as claimed in claim 1, wherein the carbon source is two or three of starch, molasses, glucose, sucrose, wheat bran, chicory residue, corn flour, sweet sorghum stalk powder and oilseed grass powder.
3. The dry land soil microorganism diversity targeted regulator as claimed in claim 1, wherein the nitrogen source is one of soybean cake powder, peanut cake powder, cottonseed powder, fish meal and silkworm chrysalis powder.
4. The dry land soil microbial diversity targeted regulator as claimed in claim 1, wherein the mass ratio of nitrogen, phosphorus and potassium in the organic fertilizer is 12-18: 10-16: 4-12.
5. The dry land soil microbial diversity targeted regulator of claim 1, wherein the coating agent is polyethylene oxide.
6. The preparation method of the dry land soil microbial diversity targeted regulating agent as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
(1) mixing and grinding organic fertilizer, carbon source, nitrogen source, fly ash, attapulgite, sodium chloride, dipotassium hydrogen phosphate and ammonium sulfate to obtain material 1;
(2) and (3) granulating and coating the material 1 obtained in the step (1) by using a granulator.
7. The preparation method of the dry land soil microbial diversity targeted regulator as claimed in claim 6, wherein the step (1) of sieving after grinding is a step of sieving with a 120-140-mesh sieve, and the sieved component is collected as material 1.
8. The preparation method of the dry land soil microbial diversity targeted regulator as claimed in claim 6, wherein the granulator in the step (2) is a twin-screw extrusion granulator.
9. The application of the dry land soil microbial diversity targeted regulator prepared by the dry land soil microbial diversity targeted regulator of any one of claims 1-5 and the preparation method of the dry land soil microbial diversity targeted regulator of any one of claims 6-8 in tobacco cultivation.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0411689A (en) * | 1990-01-30 | 1992-01-16 | Masanori Shinozaki | Soil conditioner and method of utilizing it |
| CN104876765A (en) * | 2015-05-13 | 2015-09-02 | 丽水学院 | Soil microbial community improver and preparation method and application thereof |
| CN108040565A (en) * | 2018-01-22 | 2018-05-18 | 浙江大学 | The method of Crop Improvement Flora of Rhizosphere Fungi structure of community |
| CN110776381A (en) * | 2019-12-02 | 2020-02-11 | 河南中烟工业有限责任公司 | Special tobacco fertilizer for improving functional diversity of tobacco-planting soil microorganisms |
| TWI709549B (en) * | 2020-03-24 | 2020-11-11 | 國立屏東科技大學 | Method for manufacturing organic fertilizer |
-
2022
- 2022-03-02 CN CN202210218822.1A patent/CN114539003A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0411689A (en) * | 1990-01-30 | 1992-01-16 | Masanori Shinozaki | Soil conditioner and method of utilizing it |
| CN104876765A (en) * | 2015-05-13 | 2015-09-02 | 丽水学院 | Soil microbial community improver and preparation method and application thereof |
| CN108040565A (en) * | 2018-01-22 | 2018-05-18 | 浙江大学 | The method of Crop Improvement Flora of Rhizosphere Fungi structure of community |
| CN110776381A (en) * | 2019-12-02 | 2020-02-11 | 河南中烟工业有限责任公司 | Special tobacco fertilizer for improving functional diversity of tobacco-planting soil microorganisms |
| TWI709549B (en) * | 2020-03-24 | 2020-11-11 | 國立屏東科技大學 | Method for manufacturing organic fertilizer |
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