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Alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, preparation method and application thereof

A compound liquid, lignin-based technology, applied in the field of fertilizers, can solve the problems of inability to directly use as slow-release nitrogen fertilizer, poor soil pH, low nitrogen content, etc., achieve excellent uniformity and stability, improve utilization value, The effect of high fertilizer utilization rate

Inactive Publication Date: 2020-12-11
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects or deficiencies of the low nitrogen content of the existing lignin, which cannot be directly used as a slow-release nitrogen fertilizer, and the poor effect of using lime to improve soil pH, and to provide a lignin-based long-acting nitrogen fertilizer. Sexual Compound Liquid Fertilizer

Method used

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  • Alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, preparation method and application thereof
  • Alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0067] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:

[0068] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 15g of ethylenediamine and 20g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor (400W, the same below) to react at 80° C. for 40 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction was completed.

[0069] Such as figure 1 , is the infrared spectrogram (MPL) of the lignin long-acting nitrogen fertilizer. It can be seen from the figure that N is effectively inserted into the prepared lignin long-acting nitrogen fertilizer. The mass concentration of lignin in the solution is 29g / L, and the content of organic nitrogen in the lignin is 7.2%.

[0070]...

Embodiment 2

[0073] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:

[0074] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 20 g of ethylenediamine and 20 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor to react at 80° C. for 25 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction.

[0075] The lignin mass concentration of the solution is 28g / L, and the content of organic nitrogen in the lignin is 7.0%.

[0076] Take 800 mL of the above solution, add 50.7 g of potassium nitrate, 230 g of potassium dihydrogen phosphate and 4.4 g of potassium chloride, and then dilute the solution to 1 L with distilled water. Finally, adjust the pH of the solution to be 7.5, namely th...

Embodiment 3

[0079] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:

[0080] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 10 g of ethylenediamine and 20 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor to react at 80° C. for 25 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction.

[0081] The mass concentration of lignin in the solution is 25g / L, and the content of organic nitrogen in the lignin is 6.3%.

[0082] Take 800 mL of the above solution, add 72.5 g of potassium nitrate and 230 g of potassium dihydrogen phosphate, and then dilute the solution to 1 L with distilled water. Finally, adjust the pH of the solution to be 7.5, i.e. the alkaline compound liquid f...

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Abstract

The invention provides an alkaline compound liquid fertilizer containing a lignin-based long-acting nitrogen fertilizer, a preparation method and application thereof. The alkaline compound liquid fertilizer containing the lignin-based long-acting nitrogen fertilizer comprises the following components: an alkali liquor containing lignin, wherein the content of organic nitrogen in the lignin is 6.3-10%; potassium fertilizer, wherein the content of potassium is 120-200 g / L; phosphorus fertilizer, wherein the content of phosphorus is 45-120g / L; and water, wherein the pH value of the alkaline compound liquid fertilizer is 7.5 to 8.5. According to the invention, the alkali liquor of the alkaline compound liquid fertilizer provided by the invention is high in organic nitrogen content of lignin, and can be used as a nitrogen source for nitrogen fertilizer application; alkali liquor can play a role in adjusting the pH value of soil, deep soil can be achieved through deep application and irrigation, and a good improvement effect on the surface layer and the deep soil is achieved; and a phosphate fertilizer and a potash fertilizer are compounded to obtain the compound fertilizer rich in nitrogen, phosphorus and potassium, and the compound fertilizer has the advantages of long fertilizer efficiency time, high fertilizer utilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer and a preparation method and application thereof. Background technique [0002] At present, the problem of soil acidification in my country is becoming more and more serious. From the 1980s to the 21st century, the average pH value of farmland soil across the country dropped by 0.5 units, and the acidified land area has accounted for more than 40% of my country's cultivated land area. Among them, the irrational application of chemical fertilizers is the main reason for accelerating soil acidification, especially the large-scale application of nitrogen fertilizers. Soil acidification causes a large amount of soil calcium, magnesium, potassium, phosphorus and other nutrients to be lost or fixed, resulting in an imbalance of soil nutrients and a decline in fertility, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/80C05G3/40C05G5/20
CPCC05B7/00C05G3/40C05G3/80C05G5/20C05C5/02C05C11/00C05D1/02C05F11/00
Inventor 孙少龙樊小林王浩然张立丹李中华
Owner SOUTH CHINA AGRI UNIV
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