Method for using chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer

Abstract

The present invention provides a kind of chicken manure hydrothermal carbonization liquid composite nitrogen fertilizer using method, including preparing chicken manure hydrothermal carbonization liquid, allocating chicken manure hydrothermal carbonization liquid composite nitrogen fertilizer (including base manure and topdressing), and before sowing and during the plant grows the first leaf, liquid base manure is applied at plant root or target planting area, and application amount is 50 100mL / plant;When plant enters rapid growth phase and other nitrogen-requiring cycles, 50 100mL chicken manure hydrothermal carbonization liquid composite nitrogen fertilizer is applied at plant root. The present invention overcomes the shortcomings of applying chicken manure hydrothermal carbonization liquid stock solution to suppress plant growth, diluent nitrogen supply deficiency, can safely and effectively support plant growth, increase crop yield, and rationally utilize the waste of chicken manure and change solid waste into fertilizer, protect and improve human settlement and environment.

Description

Technical Field

[0001] The invention relates to the technical field of organic fertilizers, and in particular to a method for using chicken manure hydrothermal carbonized liquid composite nitrogen fertilizer. Background Art

[0002] Plants and crops require large amounts of nitrogen for growth and development. However, the existing nitrogen content in the soil is far below what plants need. Therefore, nitrogen fertilizers must be added to the soil to meet the demand for increased crop yields. Currently, the main nitrogen fertilizers used in my country include urea, ammonium bicarbonate, ammonium chloride, and ammonium nitrate. However, with increasing nitrogen application rates for these major nitrogen fertilizers and the varying nitrogen requirements of different crops, crop nitrogen uptake has decreased, leading to lower nitrogen fertilizer utilization rates and increased nitrogen residue and loss. Traditionally, urea has been the primary nitrogen fertilizer used directly. However, excessive and frequent use of urea can inhibit the development of young roots and shoots, as well as pollute the environment. To address the negative effects of using a single nitrogen fertilizer, research has found that combining two nitrogen forms significantly promotes crop growth. Consequently, compound nitrogen fertilizers have been used to improve nitrogen absorption by crops and protect the environment. There are two main types of existing compound nitrogen fertilizer technologies. One is solid compound nitrogen fertilizer, whose powdered form easily clumps, making it difficult to distribute evenly and easily clinging to plant roots, leading to the adverse consequence of seedling burn. The other is liquid compound nitrogen fertilizer, including a stock solution of hydrothermal carbonized chicken manure. However, this stock solution inhibits plant growth, and after dilution, its liquid nitrogen content is low, resulting in a nitrogen supply that falls short of crop requirements. Therefore, there is an urgent need for a compound nitrogen fertilizer that can address the plant growth inhibition caused by the stock solution of hydrothermal carbonized chicken manure and the insufficient nitrogen supply of the diluted solution. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for using a chicken manure hydrothermal carbonized liquid composite nitrogen fertilizer, which can solve the problems that the chicken manure hydrothermal carbonized liquid original solution inhibits plant growth and the diluted liquid provides insufficient nitrogen.

[0004] The method for using the chicken manure hydrothermal carbonized liquid composite nitrogen fertilizer provided by the present invention is achieved as follows:

[0005] Step 1: Prepare chicken manure hydrothermal carbonization liquid. The specific method is as follows:

[0006] S1.1: Collect the chicken manure material and remove any visible large debris. Mix thoroughly, then sample and determine the moisture content. Place the chicken manure material in a container equipped with a mechanical stirrer. Add water to adjust the solid-to-liquid ratio to 1:3–1:5 based on the moisture content. Soak for 8–24 hours, then mechanically stir for 1–2 hours to obtain a homogenous mixture of chicken manure and water.

[0007] S1.2: Measure a certain amount of chicken manure and water mixture and transfer it to a high-pressure hydrothermal reactor, filling the reactor 30%-50% of the volume. Heat the reactor to a temperature between 180°C and 220°C at a rate of 10°C / min. React at a self-pressurized temperature for 0.5-1 hour. Cool naturally to ambient temperature. Separate the solid and liquid by mechanical filtration or centrifugation to obtain a chicken manure hydrothermal carbonized liquid.

[0008] S1.3: Screen qualified chicken manure hydrothermal carbonization liquid. The screening criteria are as follows:

[0009] The pH of the chicken manure hydrothermal carbonization liquid is 6.25-6.64, the conductivity is 29.95-30.58mS / cm, the total organic carbon concentration is 11.05-44.69g / L, the total nitrogen concentration is 1.86-4.47g / L, the ammonia nitrogen concentration is 0.75-1.45g / L, the nitrate nitrogen concentration is 18.16-49.83mg / L, the total phosphorus concentration is 0.31-0.43g / L, and the total potassium concentration is 9.05-9.73g / L.

[0010] Step 2: Prepare chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, including liquid base fertilizer A and liquid topdressing fertilizer B. The specific method is as follows:

[0011] S2.1: Prepare a liquid base fertilizer A of a chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer using chicken manure hydrothermal carbonized liquid, urea, and superphosphate to a total nitrogen concentration of 0.8-1.6 g / L and a superphosphate concentration of 1.3 g / L. The chicken manure hydrothermal carbonized liquid provides 25%-50% of the total nitrogen, and urea provides 75%-50% of the total nitrogen.

[0012] S2.2: Prepare liquid topdressing B of a chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer using chicken manure hydrothermal carbonized liquid and urea to achieve a total nitrogen concentration of 0.8-1.6 g / L, wherein the chicken manure hydrothermal carbonized liquid provides 50%-100% of the total nitrogen, and the urea provides 50%-0% of the total nitrogen.

[0013] S2.3: For base fertilizer A, when the soil is neutral or acidic, add solid potassium hydroxide (KOH) to adjust the pH of liquid base fertilizer A to 6.5-7.5; when the soil is alkaline, do not adjust the pH of liquid base fertilizer A;

[0014] S2.4: For topdressing B, when the soil is neutral or acidic, add solid potassium hydroxide (KOH) to adjust the pH of liquid topdressing B to 6.5-7.5; when the soil is alkaline, do not adjust the pH of liquid topdressing B;

[0015] Step 3: Before sowing and when the plants grow their first leaves (0-8 days), apply liquid base fertilizer A to the plant roots or target planting area at a rate of 50-100 mL per plant.

[0016] Step 4: When the plants enter a rapid growth period and other nitrogen-requiring periods, apply 50-100 mL of liquid topdressing B of chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer to the roots of the plants.

[0017] Preferably, the high-pressure hydrothermal reactor in step S1.2 is a high-pressure hydrothermal reactor with mechanical stirring, automatic timing and temperature control functions.

[0018] Preferably, in step S1.2, the temperature is 220° C. and the time is 1 hour.

[0019] Preferably, in step S1.3, pH and conductivity are measured using a pH meter and a conductivity meter. Total organic carbon and total nitrogen are measured using a TOC meter with a nitrogen measurement module. Ammoniacal nitrogen is measured using a Kjeldahl nitrogen analyzer. Total phosphorus and total potassium are measured using sulfuric acid-hydrogen peroxide digestion, molybdenum yellow colorimetry, and atomic emission spectrophotometry.

[0020] Preferably, in step S2.1, in the liquid base fertilizer A of the chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, the chicken manure hydrothermal carbonized liquid provides 25% of the total nitrogen, and urea provides 75% of the total nitrogen.

[0021] Preferably, in step S2.2, in the liquid topdressing B of the chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, the chicken manure hydrothermal carbonized liquid provides 50% of the total nitrogen, and urea provides 50% of the total nitrogen.

[0022] Preferably, the number of topdressing in step 4 is 2-4 times.

[0023] Beneficial effects of the present invention:

[0024] (1) The present invention provides a method for using a chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer. First, chicken manure, an agricultural solid waste, is converted into a chicken manure hydrothermal carbonized liquid by a hydrothermal carbonization method. The chicken manure hydrothermal carbonized liquid is then blended into a chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer. This rationally utilizes chicken manure as a waste and transforms solid waste into fertilizer, thereby protecting and improving human habitation and the environment.

[0025] (2) The present invention is a method for using the chicken manure hydrothermal carbonized liquid composite nitrogen fertilizer, which overcomes the shortcomings of applying the chicken manure hydrothermal carbonized liquid stock solution to inhibit plant growth and insufficient nitrogen supply of the diluted liquid, and can safely and effectively support plant growth and increase crop yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The effects of urea as a control treatment and chicken manure hydrothermal carbonized liquid nitrogen fertilizer on the leaf development of lettuce seedlings were investigated.

[0027] Figure 2 The effect of urea control treatment and chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer experimental treatment on the dry weight of lettuce seedlings. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will provide a clear and complete description of the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] The present invention provides a method for using a chicken manure hydrothermal carbonized liquid composite nitrogen fertilizer:

[0032] First, prepare chicken manure hydrothermal carbonization liquid, the specific method is as follows:

[0033] Collect air-dried chicken manure and remove any visible debris. Mix thoroughly, then sample and determine the moisture content. Weigh 200g of air-dried chicken manure into a 1L mechanically stirred container and add 600mL of deionized water. Soak for 8-24 hours, then mechanically stir for 1-2 hours to obtain a homogenous mixture of chicken manure and water.

[0034] A certain amount of chicken manure and water mixture is measured and transferred to a high-pressure hydrothermal reactor, filling the reactor 30% to 50% of its volume. Heating is initiated and the reactor temperature is raised to a range of 180-220°C at a rate of 10°C / min. The reaction is then allowed to react for 0.5-1.0 hours under self-boosting conditions. The mixture is then cooled naturally to ambient temperature. The solid-liquid separation is performed by centrifugation. The solid-liquid mixture is poured into a 50mL plastic centrifuge tube and centrifuged at 3000 rpm for 10 minutes. The supernatant is then decanted to obtain a chicken manure hydrothermal carbonized liquid. The chicken manure hydrothermal carbonized liquid is then stored at -20°C for later use.

[0035] Screening of qualified chicken manure hydrothermal carbonization liquid, the screening criteria are as follows:

[0036] The pH of the chicken manure hydrothermal carbonization liquid is 6.25-6.64, the conductivity is 29.95-30.58mS / cm, the total organic carbon concentration is 11.05-44.69g / L, the total nitrogen concentration is 1.86-4.47g / L, the ammonia nitrogen concentration is 0.75-1.45g / L, the nitrate nitrogen concentration is 18.16-49.83mg / L, the total phosphorus concentration is 0.31-0.43g / L, and the total potassium concentration is 9.05-9.73g / L.

[0037] Then, determine the acidity and alkalinity of the soil and prepare compound nitrogen fertilizer according to the following method:

[0038] Yan'an University campus soil (alkaline loess soil) and lettuce were used as the test soil and plant. 62.5 mL of chicken manure hydrothermal carbonization solution was measured into a 1-liter beaker and diluted with water to approximately 800 mL. 1.8 g of urea and 1.3 g of superphosphate were added to obtain Base Fertilizer A, a chicken manure hydrothermal carbonization solution compound nitrogen fertilizer.

[0039] Measure 125 mL of chicken manure hydrothermal carbonized liquid into a 1 L beaker and dilute with water to approximately 800 mL. Add 1.2 g of urea to obtain topdressing B of chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer.

[0040] When the first leaf of lettuce grows out, apply 100mL of chicken manure hydro-carbonized liquid compound nitrogen fertilizer A to the roots. When the lettuce enters the rapid growth period, apply 100mL of chicken manure hydro-carbonized liquid compound nitrogen fertilizer B to the roots.

[0041] like Figure 1 As shown, compared with the pure urea positive control with the same amount of nitrogen, the lettuce seedlings fertilized with chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer had a faster leaf growth rate.

[0042] like Figure 2 As shown, compared with the positive control of pure urea with the same amount of nitrogen, the dry weight of lettuce seedlings applied with chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer increased significantly from 0.41±0.10 g / plant to 0.67±0.14 g / plant, an increase of 67.7%.

[0043] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. All technicians familiar with the technical field shall, within the technical scope disclosed by the present invention, make equivalent replacements or changes based on the technical solutions and the concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A method for using chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer, characterized in that: include: Step 1: Prepare chicken manure hydrothermal carbonization liquid; the specific method is as follows: S1.1: Collect the chicken manure material and remove any large debris visible to the naked eye. After mixing, sample and determine the moisture content: Place the chicken manure material in a container with mechanical stirring. Add water to adjust the solid-liquid ratio to 1:3–1:5 based on the moisture content. Soak for 8–24 hours, then mechanically stir for 1–2 hours to obtain a homogenous mixture of chicken manure and water. S1.2: Measure a certain amount of chicken manure and water mixture and transfer it to a high-pressure hydrothermal reactor so that the mixture fills 30%-50% of the reactor volume; begin heating and raise the temperature of the high-pressure hydrothermal reactor to a range of 180-220°C at a rate of 10°C / min, then react under self-pressurization conditions for 0.5-1 hour; naturally cool to ambient temperature; and separate the solid and liquid by mechanical filtration to obtain a chicken manure hydrothermal carbonized liquid. S1.3: Screen qualified chicken manure hydrothermal carbonization liquid. The screening criteria are as follows: The pH of the chicken manure hydrothermal carbonization liquid is 6.25-6.64, the conductivity is 29.95-30.58 mS / cm, the total organic carbon concentration is 11.05-44.69 g / L, the total nitrogen concentration is 1.86-4.47 g / L, the ammonia nitrogen concentration is 0.75-1.45 g / L, the nitrate nitrogen concentration is 18.16-49.83 mg / L, the total phosphorus concentration is 0.31-0.43 g / L, and the total potassium concentration is 9.05-9.73 g / L. Step 2: Prepare chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, including liquid base fertilizer A and liquid topdressing fertilizer B; the specific method is as follows: S2.1: Prepare a liquid base fertilizer A of chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer using chicken manure hydrothermal carbonized liquid, urea, and superphosphate to achieve a total nitrogen concentration of 0.8-1.6 g / L and a superphosphate concentration of 1.3 g / L. The chicken manure hydrothermal carbonized liquid provides 25%-50% of the total nitrogen, and urea provides 75%-50% of the total nitrogen. S2.2: Liquid topdressing B, a compound nitrogen fertilizer made from hydrothermal carbonized chicken manure and urea, is prepared to a total nitrogen concentration of 0.8-1.6 g / L; the hydrothermal carbonized chicken manure provides 50%-100% of the total nitrogen, and the urea provides 50%-0% of the total nitrogen; S2.3: For base fertilizer A, when the soil is neutral or acidic, add solid potassium hydroxide (KOH) to adjust the pH of liquid base fertilizer A to 6.5-7.5; when the soil is alkaline, do not adjust the pH of liquid base fertilizer A; S2.4: For topdressing B, when the soil is neutral or acidic, add solid potassium hydroxide (KOH) to adjust the pH of liquid topdressing B to 6.5-7.5; when the soil is alkaline, do not adjust the pH of liquid topdressing B. Step 3: Before sowing and when the plants grow their first leaves, apply liquid base fertilizer A to the plant roots or target planting area at a rate of 50-100 mL per plant. Step 4: When the plants enter the rapid growth period, apply 50-100 mL of liquid topdressing B of chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer to the roots of the plants.

2. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: In step 4, the topdressing B is applied 2-4 times.

3. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: The high-pressure hydrothermal reactor in step S1.2 is a high-pressure hydrothermal reactor with mechanical stirring, automatic timing and temperature control functions.

4. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: In step S1.3, a pH meter and a conductivity meter are used to measure pH and conductivity; a TOC meter with a nitrogen measuring module is used to measure total organic carbon and total nitrogen; ammonia nitrogen is measured using a Kjeldahl nitrogen analyzer; and total phosphorus and total potassium are measured using sulfuric acid-hydrogen peroxide digestion, molybdenum yellow colorimetry, and atomic emission spectrophotometry.

5. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: In the step S1.2, the temperature is 220° C. and the time is 1 hour.

6. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: In step S2.1, in the liquid base fertilizer A of the chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, the chicken manure hydrothermal carbonized liquid provides 25% of the total nitrogen, and urea provides 75% of the total nitrogen.

7. The method for using the chicken manure hydrothermal carbonization liquid compound nitrogen fertilizer according to claim 1, characterized in that: In step S2.2, in the liquid topdressing B of the chicken manure hydrothermal carbonized liquid compound nitrogen fertilizer, the chicken manure hydrothermal carbonized liquid provides 50% of the total nitrogen, and urea provides 50% of the total nitrogen.

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