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Method for quickly detecting available nitrogen in soil

A detection method and soil technology, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the impact on chemical indicators, can solve the problems of inconvenient nitrogen content and the need for power, and reduce water pollution. Effects of pollution, reduction of fertilizer waste, and environmental protection

Inactive Publication Date: 2016-08-31
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a lot of instruments and parts, power supply, and deep professional knowledge and skills. It is still very inconvenient for farmers to detect the content of available nitrogen in field soil in time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for rapid detection of soil available nitrogen, comprising the following steps:

[0023] 1) Preparation of effective nitrogen speed test paper: Apply a layer of superglue evenly on the black paper with a thickness of 0.5 mm, and then quickly and evenly spray or sprinkle a layer of potassium tetraiodomercurate powder on the superglue layer, and dry it gently After drying or air-drying or sun-drying, effective nitrogen speed test paper is obtained;

[0024] 2) Prepare the color scale comparison chart: prepare 40 ammonium nitrogen solutions with known concentrations, the first ammonium nitrogen solution has a concentration of 0, and the second ammonium nitrogen solution has a concentration of 5 mg·L -1 NH 4+ , and so on, the concentration difference of adjacent ammonium nitrogen solutions is 5 mg·L -1 NH 4+ , first apply a layer of sodium hydroxide solution with a pH of 11-13 on the effective nitrogen speed test paper, and then apply the prepared ammonium nitro...

Embodiment 2

[0028] A method for rapid detection of soil available nitrogen, comprising the following steps:

[0029] Steps 1 and 2 are the same as in Example 1, wherein 20 parts of ammonium nitrogen solution with known concentration are prepared, the concentration of the first part of ammonium nitrogen solution is 0, and the concentration of the second part of ammonium nitrogen solution is 10 mg L -1 NH 4+ , and so on, the concentration difference of adjacent ammonium nitrogen solutions is 10 mg·L -1 NH 4+ ;

[0030] 3) Treatment of the soil to be tested: Take 1 tablespoon of soil solid particles (about 8g), crush them and put them into a clean porcelain bowl, add 3 tablespoons of pure water (about 20g), stir, crush the soil particles, and completely mix with water Mix evenly; let it stand for 3 minutes to obtain the soil solution to be tested;

[0031] 4) Quick detection: Take a microfiltration membrane with a pore size of about 0.45 microns, wet it with pure water, put it on the bot...

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Abstract

The invention discloses a method for quickly detecting available nitrogen in soil and ammonia nitrogen in water. The method includes preliminarily preparing available nitrogen quick test paper and available nitrogen concentration color gamut comparison diagrams; dissolving the soil in water and manufacturing to-be-detected soil solution; smearing a layer of sodium hydroxide solution with the pH (potential of hydrogen) of 11-13 on the available nitrogen quick test paper; smearing the to-be-detected soil solution on the available nitrogen quick test paper; allowing the available nitrogen quick test paper to stand still for 3-5 minutes; finding the most approximate color gamut from the color gamut comparison diagrams according to displayed colors so as to obtain the range of the content of the available nitrogen in the soil. The method has the advantages of speediness, simplicity, convenience, low cost and easiness in operation. Besides, farmers can learn to use the method within a few minutes without professional knowledge, expensive instruments and complicated operation, can quickly know the range of the content of the available nitrogen in the soil within a few minutes and can be guided to reasonably scientifically apply fertilizers, accordingly, fertilizer wastage and water pollution can be reduced, and environments can be protected.

Description

technical field [0001] The invention relates to the technical field of agricultural soil and river water environment detection, in particular to a rapid detection method for effective nitrogen content in soil and river water. Background technique [0002] Soil available nitrogen is the form of nitrogen provided by the soil for direct and rapid absorption by plants, mainly ammonium nitrogen, nitrate nitrogen, amino acid nitrogen and a small amount of protein nitrogen. Generally, ammonium nitrogen is the main form of farmland soil, especially in my country. Most of the three-component compound fertilizers are ammonium nitrogen, so the soil available nitrogen mentioned in this article mainly refers to ammonium nitrogen. [0003] Farmers in my country have long been accustomed to fertilizing and excessively applying nitrogen fertilizers for a long time, resulting in excess soil nitrogen, loss and waste, resulting in increased greenhouse gas nitrous oxide emissions from farmland, ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 吴洪生李仁英黄利东李振炫姚东良
Owner NANJING UNIV OF INFORMATION SCI & TECH
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