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Method for measuring soil quick-effective phosphor based on image analysis

A technology of image analysis and measurement method, which is applied in the field of soil chemical analysis, and can solve problems such as cumbersome operation and poor linearity at high concentrations

Inactive Publication Date: 2008-11-05
INST OF GEOCHEM CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Colorimetry, high accuracy, but cumbersome operation, and poor linearity at high concentrations

Method used

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  • Method for measuring soil quick-effective phosphor based on image analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1, the preparation of the extractant and the antimony antimony reagent is carried out according to the conventional method.

[0021] Step 2, prepare phosphorus standard solution concentration according to routine method and be 5mg L -1 .

[0022] In step 3, prepare a soil test solution of a soil sample (sample 1) of a riverside wetland according to a conventional method.

[0023] Step 4: Pipette 1, 5, 15 and 30ml of phosphorus standard solutions into 50ml volumetric flasks, use 5ml of molybdenum-antimony anti-reagent for color development, and distilled water to make up the volume, shake well, let it stand for 30 minutes, then pour into no scale In the test tubes, the concentrations were 0.1, 0.5, 1.5, 3.0mg L -1 4 standard samples.

[0024] Step 5, draw 5ml of the solution to be tested in a 50ml volumetric flask, use 5ml of molybdenum antimony anti-reagent for color development, and use distilled water to make up the volume, shake well, let stand for 30 minutes...

Embodiment 2

[0028] Steps 1, 2, 4, and 6 are the same as in Example 1.

[0029] In step 3, prepare a soil test solution of a farmland soil sample (sample 2) according to a conventional method.

[0030] Step 5, draw 2ml of the test solution into a 50ml volumetric flask, develop color with 5ml molybdenum antimony reagent, and use distilled water to make up the volume, shake well, let stand for 30 minutes, develop color with 5ml molybdenum antimony reagent, and use distilled water Set the volume, shake well, let it stand for 30 minutes, pour it into unmarked test tubes respectively, put it together with 4 standard samples on a white test tube rack, use white cardboard as the background for shooting, keep the object distance at 50cm, and use 5 million pixels A Kodak digital camera is used to shoot horizontally the test tube racks with samples and standard samples to obtain images.

[0031] Step 7, using the phosphorus concentration of the standard sample and the average blueness of the image ...

Embodiment 3

[0033] Steps 1, 2, 4, and 6 are the same as in Example 1.

[0034] Step 3, prepare a soil test solution of a vegetable field soil sample (sample 3) according to a conventional method.

[0035] Step 5, draw 10ml of the solution to be tested in a 50ml volumetric flask, develop color with 5ml of molybdenum-antimony anti-reagent, and distill the volume with distilled water, shake well, let stand for 30 minutes, develop color with 5 ml of molybdenum-antimony anti-reagent, and use distilled water Set the volume, shake well, let it stand for 30 minutes, pour it into unmarked test tubes respectively, put it together with 4 standard samples on a white test tube rack, use white cardboard as the background for shooting, keep the object distance at 50cm, and use 5 million pixels A Kodak digital camera is used to shoot horizontally the test tube racks with samples and standard samples to obtain images.

[0036] Step 7, use the phosphorus concentration of the standard sample and the averag...

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Abstract

The present invention relates to chemical analysis of soil, especially relates to a method for measuring quick-acting phosphorus in soil based on image analysis. The phosphorus -containing liquid to be measured is reacted with a color reagent and the blue color is displayed. The darkness of blue can be characterized by the blue degree which is highly dependent linearly with the phosphorus content. The image averaging blue degrees of the soil liquid to be measured and the sample are obtained with the image analysis software. A linear equation between the concentration of sample and the average blue degree value of the sample is established Y=a-bX (wherein Y is the concentration of sample, X is the average blue degree value of sample, a and b are constant quantities). The average blue degree value of the liquid to be measured is substituted into the equation to obtain the phosphor concentration of the phosphorus-containing liquid to be measured. Then the content of quick-acting phosphorus in soil is calculated. The precision of the invention is higher than that of the test paper method. The operation of the invention is simpler than that of the colorimetry. Furthermore the method of the invention is suitable for the high-concentration quick-acting phosphorus in soil.

Description

technical field [0001] The invention relates to soil chemical analysis, in particular to a method for measuring soil available phosphorus based on image analysis. Background technique [0002] Phosphorus is one of the indispensable and important nutrients in the whole growth period of crops. The purpose of measuring soil available phosphorus is to determine the application amount of phosphorus fertilizer with high crop yield, high quality and high economic benefit. In recent years, due to the improvement of people's awareness of the importance of protecting resources and the environment, in order to curb the accelerated depletion of phosphate rock resources caused by continuous large-scale application of phosphate fertilizers, and the eutrophication and eutrophication of surface water caused by phosphorus in farmland soil as non-point source pollution With the increasingly serious pollution of groundwater, the scientific and reasonable application of phosphorus fertilizer h...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 吴沿友周秋月向忠平李萍萍刘丛强
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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