Method for producing and processing liquid fertilizer for leafy vegetables

Abstract

This invention discloses a method for producing liquid fertilizer from edible leafy grass, including the steps of planting and harvesting raw materials, cleaning and impurity removal, pressing to extract juice, high-temperature decomposition and fermentation, low-temperature mixing and compounding, filtration and testing, and packaging and sales. Under preferred conditions, the edible leafy grass is grown without chemical pesticides or fertilizers, and specific parameters are controlled during pressing, fermentation, and compounding, with a reasonable ratio of auxiliary raw materials. This invention uses edible leafy grass as raw material, which is low-cost, sustainable, and has a highly efficient and energy-saving process. The product is rich in amino acids and trace elements, and functions as both a fertilizer and a regulator, improving soil, promoting plant growth, and has high resource utilization and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the field of liquid fertilizer preparation technology, specifically relating to a method for producing and processing liquid fertilizer from leafy grasses. Background Technology

[0002] With the rapid development of agricultural modernization, the widespread use of chemical fertilizers, while increasing crop yields, has also brought a series of serious problems. The most prominent of these are soil compaction, increased salinization, and imbalances in soil microbial communities, leading to a decline in soil water and fertilizer retention capacity. This, in turn, results in reduced quality and poorer taste of agricultural products. Furthermore, excessive application of chemical fertilizers can cause eutrophication of water bodies and heavy metal residues in the soil, severely hindering sustainable agricultural development. Against this backdrop, the development of new, ecological, efficient, and multifunctional liquid fertilizers to replace traditional chemical fertilizers and achieve the dual goals of soil improvement and crop quality enhancement has become an urgent need and a research hotspot in the field of agricultural technology.

[0003] Currently, there are many types of liquid fertilizers on the market, mainly divided into three categories: chemical liquid fertilizers, organic liquid fertilizers, and biological liquid fertilizers. However, each type of product has obvious defects and shortcomings. Among them, chemical liquid fertilizers, although releasing nutrients quickly and showing rapid effects, have a single nutrient composition. Long-term use can further aggravate soil compaction and salinization, and lack bioactive components, failing to improve the soil's micro-ecological environment. Organic liquid fertilizers mostly use livestock and poultry manure, straw, etc., as raw materials, which have problems such as scattered raw material collection, difficulty in processing, long fermentation cycle (usually requiring 1-3 months), and high energy consumption. In addition, they are prone to producing foul-smelling gases during fermentation, polluting the surrounding environment. At the same time, their nutrient content is unstable, making it difficult to achieve standardized production. Although biological liquid fertilizers have a certain soil improvement effect, they mostly rely on imported strains, resulting in high production costs. Moreover, the raw materials mostly depend on grain crops or cash crops grown on high-quality arable land, occupying valuable staple food arable land resources, which is not conducive to large-scale promotion and application. In addition, existing liquid fertilizers generally suffer from limited functionality, mostly providing only basic nutrients such as nitrogen, phosphorus, and potassium, and are unable to simultaneously achieve multiple effects such as soil improvement, crop stress resistance enhancement, and agricultural product quality improvement, making it difficult to meet the development needs of modern agriculture for green, efficient, and ecological purposes.

[0004] Edible leaf grass (also known as protein grass or high-oxygen vegetable) is a perennial herbaceous plant that is high in protein, fast-growing, and highly resistant to adverse conditions. Its crude protein content can reach 28%-48%, far exceeding that of ordinary legumes. The fresh stems and leaves have a water content as high as 85-95%, with a carbon-to-nitrogen ratio of 10-15:1. It is naturally rich in 18 kinds of small-molecule amino acids, various trace elements, and plant growth factors (such as SOD and flavonoids). It also exhibits salt and alkali tolerance, cold resistance, and tolerance to poor soil conditions. With its rapid growth rate, it can be harvested more than 8 times a year. It can be planted on a large scale on marginal land, saline-alkali land, and other non-staple farmland without occupying valuable arable land resources, making it an ideal green and environmentally friendly fertilizer raw material. However, currently, the application of edible leaf grass is mainly concentrated in the fields of feed and food. There are no relevant technical solutions for producing liquid fertilizer using edible leaf grass as a core raw material. Its rich nutritional components and ecological advantages have not been fully utilized, and many technical defects of existing liquid fertilizers cannot be solved. Therefore, developing an ecological liquid fertilizer production method using edible leaf grass as a raw material has significant practical significance and application value. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing liquid fertilizers, such as reliance on staple food farmland, single nutrition, insufficient functionality, long fermentation cycle, high production cost, and poor ecological performance. This invention provides a method for producing liquid fertilizer from leafy grasses, using leafy grasses as the core raw material to achieve low-cost and sustainable supply of raw materials, while simultaneously producing an ecological liquid fertilizer with multiple functions such as nutrient supply, soil improvement, and crop stress resistance enhancement.

[0006] To achieve the above objectives, the present invention employs the following technical means: A method for producing liquid fertilizer from leafy greens includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 3-5 months until maturity, harvest 8 times a year, transport the harvested fresh leafy grass from the field to the processing plant, remove rotten and withered parts, and set aside for later use. S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. S3: Juice extraction: The washed and drained leafy grass is fed into a screw press for pressing, the juice obtained from the pressing is collected, and the filter residue after pressing is removed. S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a stainless steel reactor, brown sugar bacteria are added to the reactor, the reaction temperature is controlled at 55℃, and the high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. S5: Low-temperature mixing and compounding: Transfer the primary fermentation liquid into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials into the tank, start the stirring device, mix and stir for 2 hours to obtain a compound liquid fertilizer. S6: Filtration test: The crude compound liquid fertilizer is tested for indicators. After the test results meet the standards, it is filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in quantitative quantities and can be sold after passing inspection.

[0007] Preferably, in step S1, no chemical pesticides or fertilizers are used during the cultivation of the leafy grass to ensure the ecological safety of the raw materials.

[0008] Preferably, in step S1, the leafy grass is a fresh leafy grass with a crude protein content of 28%-48%, and its tender stems and leaves have a water content of 85-95% and a carbon-nitrogen ratio of 10-15:1.

[0009] Preferably, in step S3, the pressing pressure of the screw press is 1.5-2.5 MPa and the pressing temperature is room temperature, to ensure that the amino acids and active substances in the leafy grass are not destroyed.

[0010] Preferably, in step S4, the stainless steel reactor is a sealed reactor, and the stirring speed is maintained at 60-80 r / min during the reaction to ensure that the decomposition reaction is uniform and complete.

[0011] Preferably, in step S4, the amount of brown sugar bacteria added is 3%-8% of the mass of the leafy grass juice, and the brown sugar bacteria is an EM compound bacteria, which is a mixture of lactic acid bacteria, yeast and actinomycetes in a volume ratio of 1:1:1.

[0012] Preferably, in step S5, the stirring speed of the stainless steel mixing tank is 100-120 r / min, and the temperature is kept constant at 35°C during the stirring process to ensure that the raw materials are mixed evenly.

[0013] Preferably, in step S5, the other auxiliary raw materials, by mass, include: 10-15 parts urea, 8-12 parts potassium dihydrogen phosphate, 5-8 parts potassium sulfate, and 0.5-1 parts trace elements, wherein the trace elements are one or more of iron, zinc, manganese, and boron.

[0014] Preferably, in step S6, the test compliance means that the indicators of the finished liquid fertilizer product meet the following requirements: total amino acid content ≥100g / L, total nitrogen, phosphorus and potassium content ≥150g / L, pH value 5.5-7.5, and no obvious insoluble impurities.

[0015] Preferably, in step S7, the packaging is a light-proof, sealed plastic bucket or glass bottle.

[0016] The present invention has the following beneficial effects: 1. Significant advantages in raw materials, low cost and sustainability: This invention is the first to use leafy grass as raw material to produce liquid fertilizer. Leafy grass grows fast, can be harvested 8 times a year, is salt-tolerant and cold-resistant, and can be planted on marginal land without occupying staple food farmland, thus achieving a low-cost, large-scale and stable supply of raw materials. At the same time, leafy grass has a high crude protein content and is rich in nutrients, so there is no need to add a large amount of organic raw materials, which greatly reduces production costs.

[0017] 2. Scientific and rational process, high efficiency and energy saving: The present invention adopts a dual process of "high temperature decomposition and fermentation + low temperature mixing and compounding". High temperature fermentation can shorten the composting cycle, and low temperature compounding can retain active ingredients. Moreover, the tender stems and leaves of edible grass have a high water content, so there is no need to add a lot of external water for pressing, which greatly reduces the energy consumption of crushing and the water consumption of fermentation. The whole process is simple and easy to operate, and is suitable for large-scale industrial production.

[0018] 3. Comprehensive Product Functions and Eco-friendly: The prepared plant amino acid ecological liquid fertilizer is rich in 18 kinds of small molecule amino acids, nitrogen, phosphorus, potassium and trace elements. It has the dual function of "fertilizer + regulator". It can not only provide plants with fast-acting nutrition, but also serve as a plant health care product and soil conditioner. It can improve the soil's water and fertilizer retention capacity, stimulate plant seed germination and root development, enhance the plant's resistance to environmental stresses such as drought, salinity, and low temperature, increase fruit sugar content, improve color and taste, and establish a healthy soil micro-ecology. At the same time, no chemical pesticides or fertilizers are used in the raw material planting process, and the product has no harmful residues. It is eco-friendly and meets the needs of sustainable agricultural development.

[0019] 4. High resource utilization rate and high added value: The filter residue of the pressed leafy grass can be used as raw material for organic fertilizer, realizing the recycling of resources; the comprehensive utilization of leafy grass not only solves the problem of its resource utilization, but also increases the added value of the product, with significant economic and ecological benefits. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A method for producing liquid fertilizer from leafy greens includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 3-5 months until maturity, harvest 8 times a year, transport the harvested fresh leafy grass from the field to the processing plant, remove rotten and withered parts, and set aside for later use. In step S1, no chemical pesticides or fertilizers are used during the cultivation of leafy grass to ensure the ecological safety of the raw materials. The leafy grass is a fresh leafy grass with a crude protein content of 28%-48%, and its tender stems and leaves have a water content of 85-95% and a carbon-nitrogen ratio of 10-15:1. Leafy grass with these indicators is not only rich in nutrients, but also easy to press for juice and ferment and decompose, which can retain the active ingredients to the maximum extent.

[0022] S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. The purpose of this step is to remove impurities from the surface of the raw materials to prevent them from affecting the subsequent fermentation effect and product quality. Draining the surface water can prevent excessive water from diluting the nutrients in the leafy green juice and ensure the concentration of the raw materials.

[0023] S3: Juice extraction: The washed and drained leafy grass is fed into a screw press for pressing, the juice obtained from the pressing is collected, and the filter residue after pressing is removed. In step S3, the pressing pressure of the screw press is controlled at 1.5-2.5MPa and the pressing temperature is at room temperature. This parameter setting can ensure that the amino acids and active substances in the leafy grass are not destroyed, while maximizing the extraction of nutrients from the leafy grass and improving the juice recovery rate. The filter residue after pressing can be used as raw material for organic fertilizer, realizing the recycling of resources.

[0024] S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a stainless steel reactor, brown sugar bacteria are added to the reactor, the reaction temperature is controlled at 55℃, and the high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. In step S4, the stainless steel reactor adopts a sealed structure, and the stirring speed is maintained at 60-80 r / min during the reaction to ensure uniform and complete decomposition. The amount of brown sugar bacteria added is 3%-8% of the mass of the leafwort juice. The brown sugar bacteria is an EM compound bacteria, which is a mixture of lactic acid bacteria, yeast, and actinomycetes in a 1:1:1 volume ratio. The EM compound bacteria can quickly decompose proteins, carbohydrates, and other substances in the leafwort juice, converting them into nutrients such as amino acids and small molecule peptides that are easily absorbed by plants. The high temperature of 55℃ can accelerate the fermentation speed, shorten the fermentation cycle, and inhibit the growth of harmful microorganisms, ensuring the safety of the fermentation liquid.

[0025] S5: Low-temperature mixing and compounding: Transfer the primary fermentation liquid into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials into the tank, start the stirring device, mix and stir for 2 hours to obtain a compound liquid fertilizer. In step S5, the stirring speed of the stainless steel mixing tank is controlled at 100-120 r / min, and the temperature is maintained at a constant 35℃ during the stirring process to ensure that all raw materials are mixed evenly. The other auxiliary raw materials, by weight, include: 10-15 parts urea, 8-12 parts potassium dihydrogen phosphate, 5-8 parts potassium sulfate, and 0.5-1 parts trace elements, wherein the trace elements are one or more of iron, zinc, manganese, and boron. The low-temperature environment of 35℃ avoids high-temperature damage to the active ingredients in the primary fermentation broth, while ensuring that nitrogen, phosphorus, potassium, and auxiliary raw materials are fully dissolved and mixed evenly, compensating for the deficiency of some nutrients in the leafy green juice and improving the nutritional comprehensiveness of the product.

[0026] S6: Filtration test: The crude compound liquid fertilizer is tested for indicators. After the test results meet the standards, it is filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. In step S6, the "meeting the standards" means that the finished liquid fertilizer product meets the following requirements: total amino acid content ≥100g / L, total nitrogen, phosphorus, and potassium content ≥150g / L, pH value 5.5-7.5, and no obvious insoluble impurities. A 200-mesh vibrating screen can effectively remove insoluble impurities from the crude product, ensuring product uniformity and stability. The testing steps ensure that the product quality meets usage requirements and prevent unqualified products from leaving the factory.

[0027] S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in quantitative quantities and can be sold after passing inspection. In step S7, the packaging uses light-proof and sealed plastic buckets or glass bottles to prevent the active ingredients in the liquid fertilizer from being damaged by light, while also preventing air from entering and causing the product to deteriorate, thus extending the product's shelf life. Example

[0028] A method for producing liquid fertilizer from leafy greens includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 3 months until maturity. No chemical pesticides or fertilizers are used during the planting process. Harvest 8 times a year. After harvesting, transport the fresh leafy grass (crude protein content 28%, fresh tender stem and leaf water content 85%, carbon-nitrogen ratio 10:1) from the field to the processing plant, remove rotten and withered parts, and set aside for later use. S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. S3: Juice extraction: The washed and drained leafy grass is fed into a screw press. The pressing pressure is controlled at 1.5MPa and the pressing temperature is at room temperature. The pressing process is carried out, the juice of the leafy grass is collected, and the filter residue after pressing is removed. S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a sealed stainless steel reactor. 3% of the leafy grass juice mass of brown sugar bacteria (EM compound bacteria, which is a mixture of lactic acid bacteria, yeast and actinomycetes in a volume ratio of 1:1:1) is added to the reactor. The reaction temperature is controlled at 55℃, and the stirring speed is maintained at 60r / min. The high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. S5: Low-temperature mixing and compounding: Transfer the primary fermentation broth into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials (by mass: 10 parts urea, 8 parts potassium dihydrogen phosphate, 5 parts potassium sulfate, 0.5 parts trace elements, the trace elements being a mixture of iron and zinc), start the stirring device, control the stirring speed to 100r / min, mix and stir for 2 hours to obtain a compound liquid fertilizer crude product; S6: Filtration test: The crude compound liquid fertilizer was tested for indicators. The test results were: total amino acid content 100g / L, total nitrogen, phosphorus and potassium content 150g / L, pH value 5.5, no obvious insoluble impurities, and the test met the standards. It was then filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in light-proof, sealed plastic buckets in fixed quantities, and sold after passing inspection. Example

[0029] A method for producing liquid fertilizer from leafy greens includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 4 months until maturity. No chemical pesticides or fertilizers are used during the planting process. Harvest 8 times a year. After harvesting, transport the fresh leafy grass (crude protein content 38%, fresh tender stems and leaves water content 90%, carbon-nitrogen ratio 12:1) from the field to the processing plant, remove rotten and withered parts, and set aside for later use. S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. S3: Juice extraction: The washed and drained leafy grass is fed into a screw press. The pressing pressure is controlled at 2.0 MPa and the pressing temperature is at room temperature. The pressing process is carried out, the juice of the leafy grass is collected, and the filter residue after pressing is removed. S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a sealed stainless steel reactor. 5% of the leafy grass juice mass of brown sugar bacteria (EM compound bacteria, which is a mixture of lactic acid bacteria, yeast and actinomycetes in a volume ratio of 1:1:1) is added to the reactor. The reaction temperature is controlled at 55℃, and the stirring speed is maintained at 70r / min. The high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. S5: Low-temperature mixing and compounding: Transfer the primary fermentation broth into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials (by mass: 12 parts urea, 10 parts potassium dihydrogen phosphate, 6 parts potassium sulfate, 0.8 parts trace elements, the trace elements being a mixture of iron, zinc and manganese), start the stirring device, control the stirring speed to 110 r / min, mix and stir for 2 hours to obtain a compound liquid fertilizer crude product; S6: Filtration test: The crude compound liquid fertilizer was tested for indicators. The test results were: total amino acid content 120g / L, total nitrogen, phosphorus and potassium content 180g / L, pH value 6.5, no obvious insoluble impurities, and the test met the standards. It was then filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in light-proof, sealed glass bottles in a fixed quantity, and sold after passing inspection. Example

[0030] A method for producing liquid fertilizer from leafy greens includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 5 months until maturity. No chemical pesticides or fertilizers are used during the planting process. Harvest 8 times a year. After harvesting, transport the fresh leafy grass (crude protein content 48%, fresh tender stems and leaves water content 95%, carbon-nitrogen ratio 15:1) from the field to the processing plant, remove rotten and withered parts, and set aside for later use. S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. S3: Juice extraction: The washed and drained leafy grass is fed into a screw press. The pressing pressure is controlled at 2.5 MPa and the pressing temperature is at room temperature. The pressing process is carried out, the juice of the leafy grass is collected, and the filter residue after pressing is removed. S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a sealed stainless steel reactor. 8% of the leafy grass juice mass of brown sugar bacteria (EM compound bacteria, which is a mixture of lactic acid bacteria, yeast, and actinomycetes in a volume ratio of 1:1:1) is added to the reactor. The reaction temperature is controlled at 55℃, and the stirring speed is maintained at 80r / min. The high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. S5: Low-temperature mixing and compounding: Transfer the primary fermentation broth into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials (by mass: 15 parts urea, 12 parts potassium dihydrogen phosphate, 8 parts potassium sulfate, 1 part trace elements, the trace elements being a mixture of iron, zinc, manganese and boron), start the stirring device, control the stirring speed to 120 r / min, mix and stir for 2 hours to obtain a compound liquid fertilizer crude product; S6: Filtration test: The crude compound liquid fertilizer was tested for indicators. The test results were: total amino acid content 150g / L, total nitrogen, phosphorus and potassium content 200g / L, pH value 7.5, no obvious insoluble impurities, and the test met the standards. It was then filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in light-proof, sealed plastic buckets in fixed quantities, and sold after passing inspection.

[0031] The examples provided in this invention are not intended to limit the implementation. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations, and any obvious variations or modifications derived therefrom are still within the scope of this invention.

Claims

1. A method for producing liquid fertilizer from leafy greens, characterized in that, Includes the following steps: S1: Raw material planting and harvesting: Plant leafy grass for 3-5 months until maturity, harvest 8 times a year, transport the harvested fresh leafy grass from the field to the processing plant, remove rotten and withered parts, and set aside for later use. S2: Cleaning and removing impurities: Place the prepared fresh edible leaves into the cleaning equipment, rinse with clean water to remove impurities, mud and residual soil attached to the surface, and drain the surface water after cleaning. S3: Juice extraction: The washed and drained leafy grass is fed into a screw press for pressing, the juice obtained from the pressing is collected, and the filter residue after pressing is removed. S4: High-temperature decomposition and fermentation: The collected leafy grass juice is transferred into a stainless steel reactor, brown sugar bacteria are added to the reactor, the reaction temperature is controlled at 55℃, and the high-temperature decomposition reaction is carried out for 3 hours to obtain the primary fermentation liquid. S5: Low-temperature mixing and compounding: Transfer the primary fermentation liquid into a stainless steel mixing tank, adjust the temperature inside the mixing tank to 35℃, add nitrogen, phosphorus, potassium and other auxiliary raw materials into the tank, start the stirring device, mix and stir for 2 hours to obtain a compound liquid fertilizer. S6: Filtration test: The crude compound liquid fertilizer is tested for indicators. After the test results meet the standards, it is filtered through a 200-mesh vibrating screen to remove insoluble impurities and obtain the finished plant amino acid ecological liquid fertilizer. S7: Packaging and Sales: The filtered liquid fertilizer product is packaged in quantitative quantities and can be sold after passing inspection.

2. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S1, no chemical pesticides or fertilizers are used during the cultivation of the leafy grass to ensure the ecological safety of the raw materials.

3. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S1, the edible grass is a fresh edible grass with a crude protein content of 28%-48%, and its tender stems and leaves have a water content of 85-95% and a carbon-nitrogen ratio of 10-15:

1.

4. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S3, the pressing pressure of the screw press is 1.5-2.5 MPa and the pressing temperature is room temperature to ensure that the amino acids and active substances in the leafy grass are not destroyed.

5. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S4, the stainless steel reactor is a sealed reactor, and the stirring speed is maintained at 60-80 r / min during the reaction to ensure that the decomposition reaction is uniform and complete.

6. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S4, the amount of brown sugar bacteria added is 3%-8% of the mass of the leafy grass juice. The brown sugar bacteria is an EM compound bacteria, which is a mixture of lactic acid bacteria, yeast and actinomycetes in a volume ratio of 1:1:

1.

7. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S5, the stirring speed of the stainless steel mixing tank is 100-120 r / min, and the temperature is kept constant at 35℃ during the stirring process to ensure that all raw materials are mixed evenly.

8. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S5, the other auxiliary raw materials, by mass, include: 10-15 parts urea, 8-12 parts potassium dihydrogen phosphate, 5-8 parts potassium sulfate, and 0.5-1 parts trace elements, wherein the trace elements are one or more of iron, zinc, manganese, and boron.

9. The method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S6, the "meeting the test standards" means that the indicators of the finished liquid fertilizer product meet the following requirements: total amino acid content ≥100g / L, total nitrogen, phosphorus and potassium content ≥150g / L, pH value 5.5-7.5, and no obvious insoluble impurities.

10. A method for producing liquid fertilizer from leafy greens according to claim 1, characterized in that, In step S7, the packaging is a light-proof, sealed plastic bucket or glass bottle.