CN113959975A - Soil pH value calculation method, prediction method and prediction system based on near infrared spectrum - Google Patents
Soil pH value calculation method, prediction method and prediction system based on near infrared spectrum Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 157
- 238000002329 infrared spectrum Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004364 calculation method Methods 0.000 title claims abstract description 17
- 238000004497 NIR spectroscopy Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 241000208125 Nicotiana Species 0.000 claims description 16
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000010561 standard procedure Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000000692 Student's t-test Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000004313 potentiometry Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/80—Indicating pH value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention discloses a soil pH value calculation method, a prediction method and a prediction system based on near infrared spectroscopy, and belongs to the technical field of soil detection. The soil pH value calculation method based on the near infrared spectrum adopts the following formula I to calculate the soil pH value of a target area; in formula I, Y is the soil pH value, x1、x2……x38The number of points in the characteristic band of the near infrared spectrum of the soil in the target area. The method and the system of the invention are adopted to calculate and predict the pH value of the soil, only sampling is needed to carry out near infrared spectrum data determination under a near infrared spectrometer, no chemical experiment is needed, no chemical reagent is needed, and the method and the system are environment-friendly, safe, convenient and quick, and are worthy of wide popularization and application.
Description
Technical Field
The invention belongs to the technical field of soil detection, and particularly relates to a soil pH value calculation method, a soil pH value prediction method and a soil pH value prediction system based on near infrared spectrum.
Background
The tobacco planting soil can be specially used for planting tobacco, the suitable soil environment condition is the basis of high quality and good yield of the tobacco, and the physical and chemical properties of the soil directly influence the quality of the tobacco.
The pH value of the soil, namely the pH value of the soil, is an important index for evaluating the soil property and is also an important influence factor of the soil environmental condition. The pH value of the soil not only influences the biological activity of the soil, but also is closely related to the formation, transformation and effectiveness of soil nutrients and the growth and development of crops. The traditional soil pH value determination mainly adopts a colorimetric method and a potentiometric method, and the two methods have the defects of complex determination steps, long determination time, need of using chemical reagents and are not suitable for large-scale rapid determination. Therefore, in recent years, some methods for rapidly measuring the pH value of the soil by using a spectral image technology emerge in the prior art, but the effect is poor in the aspect of accuracy.
The near infrared spectrum is a wave of electromagnetic radiation between the visible (Vis) and mid-infrared (MIR) regions defined by the American Society for Testing and Materials (ASTM) as the 780-2526nm region, the first non-visible region one finds in the absorption spectrum. The near infrared spectrum region is consistent with the frequency combination of the vibration of the hydrogen-containing group (O-H, N-H, C-H) in the organic molecule and the absorption region of each level of frequency multiplication, the characteristic information of the hydrogen-containing group in the organic molecule in the sample can be obtained by scanning the near infrared spectrum of the sample, and the analysis of the sample by using the near infrared spectrum technology has the advantages of convenience, rapidness, high efficiency, accuracy, lower cost, no damage to the sample, no consumption of chemical reagents, no environmental pollution and the like, so the technology is favored by more and more people.
However, the method and system for rapidly predicting the pH value of soil, especially tobacco-planting soil, based on near infrared spectrum has not been reported in the field.
Disclosure of Invention
Based on the blank in the prior art in the field, the invention provides a tobacco planting soil pH value prediction method and system based on near infrared spectrum.
The technical scheme of the invention is as follows:
a soil pH value calculation method based on near infrared spectrum is characterized in that the soil pH value of a target area is calculated by adopting the following formula I:
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.
1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2……x38The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
The point number of the characteristic wave band of the near infrared spectrum of the soil in the target area refers to a numerical value measured by the soil sample in the target area under a near infrared spectrometer.
The number of points of the characteristic wave band of the near infrared spectrum of the soil in the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1The number of points of a wave band; x is the number of29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1The number of points of a wave band; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
The soil refers to tobacco planting soil; preferably Kunming tobacco planting soil.
A soil pH value prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of a soil sample in a target area, and substituting the near infrared spectrum data into the following formula I to obtain the pH value of the soil;
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2……x38The number of points in the characteristic wave band of the near infrared spectrum of the soil sample in the target area.
The soil pH value prediction method based on the near infrared spectrum further comprises the following steps: and selecting the point number of the characteristic wave band of the near infrared spectrum of the soil sample in the target area from the near infrared spectrum data.
The number of points of the characteristic wave band of the near infrared spectrum of the soil sample in the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1The number of points of a wave band; x is the number of29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1Of wave bandsCounting; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
The point number of the characteristic wave band of the near infrared spectrum of the soil sample in the target area refers to a numerical value measured by the soil sample in the target area under a near infrared spectrometer;
preferably, the soil is tobacco planting soil; preferably Kunming tobacco planting soil.
A soil pH value prediction system based on near infrared spectrum comprises a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program is executed by a processor to perform a near infrared spectrum based soil pH calculation method.
The soil pH value calculation method based on the near infrared spectrum and/or the soil pH value prediction method based on the near infrared spectrum and/or the application of the soil pH value prediction system based on the near infrared spectrum in the aspects of detecting and screening soil.
According to the method, a large amount of soil is sampled and measured on site, soil near infrared spectrum data and original data of the pH value of the soil are obtained in a certain scale, a data sample library is formed, modeling processing such as fitting and inversion is carried out on the large amount of data by taking the soil infrared spectrum data as independent variables and the soil pH value as dependent variables, 38 characteristic wave bands which are substantially related to the content of the soil pH value are finally screened from the soil near infrared spectrum, and a relational expression of the number of points of the 38 wave bands of the near infrared spectrum and the soil pH value is finally obtained. Based on the relational expression, the invention provides a method for calculating the pH value of the soil, a method for predicting the pH value of the soil and a system for predicting the pH value of the soil.
The invention utilizes the calculation method, the prediction method and the prediction system to sample the soil of a plurality of target areas and measure the near infrared spectrum data of the soil, respectively calculates and predicts the pH value of the soil of each target area to obtain predicted values, measures the actual content of the pH value of a large amount of soil samples, namely measured values (reference values) by a conventional pH value measurement method, finds that the difference between the predicted values and the measured values is not significant, and fully proves that the prediction method of the invention has extremely high accuracy in the aspect of predicting the pH value of the soil. Moreover, the method and the system of the invention are adopted to calculate and predict the pH value of the soil, only sampling is needed to carry out near infrared spectrum data measurement under a near infrared spectrometer, no chemical experiment is needed, no chemical reagent is needed, and the method and the system are environment-friendly, safe, convenient and quick, and are worthy of wide popularization and application.
Detailed Description
The following detailed description of the present invention is provided in connection with specific embodiments, but not intended to limit the scope of the present invention.
Group 1 example, method for calculating pH of soil according to the present invention
The group of embodiments provides a soil pH value calculation method based on near infrared spectrum. All embodiments of this group share the following common features: the soil pH value calculation method based on the near infrared spectrum adopts the following formula I to calculate the soil pH value of a target area:
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、x12、x13、x14、x15、x16、x17、x18、x19、x20、x21、x22、x23、x24、x25、x26、x27、x28、x29、x30、x31、x32、x33、x34、x35、x36、x37、x38The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
In a specific embodiment, the point number of the characteristic wave band of the near infrared spectrum of the soil in the target area refers to the value measured by the soil sample in the target area under the near infrared spectrometer.
In a further embodiment, the number of points of the characteristic band of the near infrared spectrum of the soil of the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1The number of points of a wave band; x is the number of29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1The number of points of a wave band; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
In a preferred embodiment, the soil refers to tobacco planting soil; preferably Kunming tobacco planting soil.
Group 2 example method for predicting pH of soil according to the present invention
The group of embodiments provides a soil pH value prediction method based on near infrared spectroscopy. All embodiments of this group share the following common features: the soil pH value prediction method based on the near infrared spectrum comprises the following steps: measuring near infrared spectrum data of a soil sample in a target area, and substituting the near infrared spectrum data into the following formula I to obtain the pH value of the soil;
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、x12、x13、x14、x15、x16、x17、x18、x19、x20、x21、x22、x23、x24、x25、x26、x27、x28、x29、x30、x31、x32、x33、x34、x35、x36、x37、x38The number of points in the characteristic wave band of the near infrared spectrum of the soil sample in the target area.
In a further embodiment, the soil pH prediction method based on near infrared spectrum further includes: and selecting the point number of the characteristic wave band of the near infrared spectrum of the soil sample in the target area from the near infrared spectrum data.
In a specific embodiment, the number of points in the characteristic band of the near infrared spectrum of the soil sample in the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1The number of points of a wave band; x is the number of29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1The number of points of a wave band; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
In some embodiments, the number of points in a characteristic band of the near infrared spectrum of the soil sample of the target area refers to a value determined by the soil sample of the target area under a near infrared spectrometer;
in a preferred embodiment, the soil is tobacco-planting soil; preferably Kunming tobacco planting soil.
Group 3 example soil pH prediction System of the invention
The group of embodiments provides a soil pH value prediction system based on near infrared spectroscopy. In all of the examples in this group, the soil pH prediction system has the following common features: the soil pH value prediction system based on the near infrared spectrum comprises a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program, when executed by a processor, performs a method of soil pH calculation based on near infrared spectroscopy as provided in any one of group 1 of the embodiments.
EXAMPLE 4 group, method for calculating pH of soil, method for predicting pH of soil, and use of prediction system
The present group of embodiments provides a method for calculating a soil pH value based on near infrared spectrum as provided in any one of the group 1 embodiments, and/or a method for predicting a soil pH value based on near infrared spectrum as provided in any one of the group 2 embodiments, and/or a system for predicting a soil pH value based on near infrared spectrum as provided in any one of the group 3 embodiments, for detecting and screening soil.
Experimental example, soil pH value prediction method and prediction system accuracy verification
Taking tobacco planting soil in different areas of different places as samples, and numbering; dividing the soil samples in each area into 6 groups, wherein 3 groups adopt a near-infrared spectrometer to measure the near-infrared spectrum data of the soil samples, and obtain the point value of a characteristic waveband, substituting the prediction method of the invention into a formula I to calculate the pH value in the soil, and taking the average value of 3 groups of the soil samples which are 3 times of repetition to obtain the predicted value of the pH value (such as data listed in a column of 'predicted value' in the following table 1);
in the other 3 groups, soil pH measurement was carried out by a method conventionally used in the art (standard method, for example, the method described in "measurement of pH in soil" NY/T1377-2007 standard document) and the pH value was measured by averaging 3 replicates in the 3 groups to obtain an actual value of pH value (data listed in the column of "reference value" in Table 1 below).
Specific values are shown in table 1 below:
TABLE 1
The two columns of data in table 1 above were input into SPSS statistical software for significance analysis (t-test) and the results are shown in table 2 below:
TABLE 2
As can be seen from table 1 above, the predicted value of the pH value in the soil sample predicted by the prediction method of the present invention and the reference value actually measured by the conventional method (industry standard method) have a relative deviation average value between two sets of data of 8.93%, and according to the general experience in the art, the relative deviation average value is below 20%, and the result is credible.
Moreover, the difference analysis results in table 2 show that the P value is greater than 0.05, which indicates that the difference between the two sets of data is not significant, and further shows that the soil pH value number obtained by the prediction calculation of the soil pH value prediction method of the present invention is not significantly different from the reference value actually measured by the standard method, and the prediction method of the present invention has accuracy.
Claims (10)
1. A soil pH value calculation method based on near infrared spectrum is characterized in that the soil pH value of a target area is calculated by adopting the following formula I:
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2……x38The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
2. The soil pH value calculation method based on near infrared spectrum of claim 1, wherein the point number of the characteristic wave band of the near infrared spectrum of the soil in the target area refers to the value measured by the soil sample in the target area under the near infrared spectrometer.
3. The soil pH value calculation method based on near infrared spectrum according to claim 1 or 2, characterized in that the number of points of the characteristic wave band of near infrared spectrum of the soil of the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1Number of points in a band；x29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1The number of points of a wave band; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
4. The method for calculating the pH value of soil based on near infrared spectroscopy according to any one of claims 1 to 3, wherein the soil is tobacco-planting soil; preferably Kunming tobacco planting soil.
5. A soil pH value prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of a soil sample in a target area, and substituting the near infrared spectrum data into the following formula I to obtain the pH value of the soil;
formula I:
Y＝0.5589x1-0.5062x2-0.4968x3-0.3909x4+0.7445x5+0.3028x6+0.4389x7-0.2903x8+0.3337x9-0.1642x10-0.3445x11+0.2154x12+0.2516x13+0.2631x14+0.1713x15-0.0803x16-0.2739x17-0.264x18-0.2004x19+0.2108x20-0.1946x21-0.2446x22+0.1641x23+0.2214x24+0.2331x25+0.1281x26-0.166x27+0.3138x28+0.3258x29+0.3258x30+0.2276x31+0.3331x32+0.3576x33-0.1239x34-0.1617x35-0.2716x36-0.3403x37-0.2248x38；
wherein Y is the pH value of soil and x1、x2……x38The number of points in the characteristic wave band of the near infrared spectrum of the soil sample in the target area.
6. The soil pH prediction method based on near infrared spectrum of claim 5, further comprising: and selecting the point number of the characteristic wave band of the near infrared spectrum of the soil sample in the target area from the near infrared spectrum data.
7. The soil pH value prediction method based on near infrared spectrum as claimed in claim 5, wherein the number of points of the characteristic wave band of the near infrared spectrum of the soil sample in the target area refers to:
x1represents 4080.048cm-1The number of points of a wave band; x is the number of2Represents 4141.115cm-1The number of points of a wave band; x is the number of3Represents 4194.549cm-1The number of points of a wave band; x is the number of4Represents 4213.632cm-1The number of points of a wave band; x is the number of5Represents 4267.066cm-1The number of points of a wave band; x is the number of6Represents 4366.3cm-1The number of points of a wave band; x is the number of7Represents 4423.551cm-1The number of points of a wave band; x is the number of8Represents 4461.718cm-1The number of points of a wave band; x is the number of9Represents 4499.885cm-1The number of points of a wave band; x is the number of10Represents 4538.052cm-1The number of points of a wave band; x is the number of11Represents 4583.852cm-1The number of points of a wave band; x is the number of12Represents 4622.019cm-1The number of points of a wave band; x is the number of13Represents 4816.67cm-1The number of points of a wave band; x is the number of14Represents 4831.937cm-1The number of points of a wave band; x is the number of15Represents 4854.837cm-1The number of points of a wave band; x is the number of16Represents 4946.438cm-1The number of points of a wave band; x is the number of17Represents 5053.306cm-1The number of points of a wave band; x is the number of18Represents 5083.839cm-1The number of points of a wave band; x is the number of19Represents 5167.807cm-1The number of points of a wave band; x is the number of20Represents 5205.974cm-1The number of points of a wave band; x is the number of21Represents 5289.941cm-1The number of points of a wave band; x is the number of22Represents 5343.375cm-1The number of points of a wave band; x is the number of23Represents 5663.977cm-1The number of points of a wave band; x is the number of24Represents 5686.877cm-1The number of points of a wave band; x is the number of25Represents 5705.96cm-1The number of points of a wave band; x is the number of26Represents 5839.545cm-1The number of points of a wave band; x is the number of27Represents 5999.846cm-1The number of points of a wave band; x is the number of28Represents 7026.538cm-1The number of points of a wave band; x is the number of29Represents 7041.804cm-1The number of points of a wave band; x is the number of30Represents 7095.238cm-1The number of points of a wave band; x is the number of31Represents 7171.572cm-1The number of points of a wave band; x is the number of32Represents 7190.655cm-1The number of points of a wave band; x is the number of33Represents 7205.922cm-1The number of points of a wave band; x is the number of34Represents 7289.89cm-1The number of points of a wave band; x is the number of35Represents 8740.234cm-1The number of points of a wave band; x is the number of36Represents 9022.67cm-1The number of points of a wave band; x is the number of37Represents 9041.753cm-1The number of points of a wave band; x is the number of38Represents 9057.02cm-1The number of points of the band.
8. The soil pH value prediction method based on near infrared spectrum according to any one of claims 5 to 7, wherein the point number of the characteristic wave band of the near infrared spectrum of the soil sample of the target area indicates the value of the soil sample of the target area measured under the near infrared spectrometer;
preferably, the soil is tobacco planting soil; preferably Kunming tobacco planting soil.
9. A soil pH value prediction system based on near infrared spectrum comprises a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program, when executed by a processor, performs a method of soil pH calculation based on near infrared spectroscopy as claimed in any one of claims 1 to 4.
10. The method for calculating the soil pH value based on the near infrared spectrum according to any one of claims 1 to 4, and/or the method for predicting the soil pH value based on the near infrared spectrum according to any one of claims 5 to 8, and/or the system for predicting the soil pH value based on the near infrared spectrum according to claim 9 is applied to the detection and screening of soil.
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