CN113758897A - Near infrared spectrum-based soil hydrolyzable nitrogen calculation method, prediction method and prediction system - Google Patents
Near infrared spectrum-based soil hydrolyzable nitrogen calculation method, prediction method and prediction system Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 239000002689 soil Substances 0.000 title claims abstract description 125
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 92
- 238000002329 infrared spectrum Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000004364 calculation method Methods 0.000 title abstract description 7
- 238000004497 NIR spectroscopy Methods 0.000 claims description 7
- 241000208125 Nicotiana Species 0.000 claims description 6
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 6
- 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
- 238000005070 sampling Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 238000005903 acid hydrolysis reaction Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
-
- 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
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for calculating soil hydrolyzable nitrogen based on near infrared spectrum, a method for predicting soil hydrolyzable nitrogen based on near infrared spectrum and a system for predicting soil hydrolyzable nitrogen based on near infrared spectrum, and belongs to the technical field of soil detection. The calculation method is characterized in that: calculating the content of the hydrolyzable nitrogen of the soil in the target area by adopting the following formula I; in formula I, Y is a dimensionless number of hydrolyzable nitrogen in the soil of the target area, x1、x2……x59The 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 hydrolyzable nitrogen 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 method for calculating soil hydrolyzable nitrogen based on near infrared spectrum, a method for predicting soil hydrolyzable nitrogen based on near infrared spectrum and a system for predicting soil hydrolyzable nitrogen based on near infrared spectrum.
Background
The tobacco planting soil is the foundation of the growth of the flue-cured tobacco, and the physical and chemical properties of the soil have direct influence on the growth of the flue-cured tobacco and are closely related to the yield, quality and style of the flue-cured tobacco.
Soil hydrolyzable nitrogen, also called soil available nitrogen, includes ammonium nitrogen, nitrate nitrogen, relatively simple amino acid nitrogen, amide and easily hydrolyzable protein nitrogen which are easily decomposed in part of organic matters. The soil hydrolyzable nitrogen is an important index for evaluating soil properties and is also an important influence factor of soil environmental conditions. The soil hydrolyzable nitrogen not only affects the soil biological activity, but also is closely related to the formation, transformation and effectiveness of soil nutrients and the growth and development of crops. The traditional soil hydrolyzable nitrogen determination method comprises an acid hydrolysis method and an alkali hydrolysis method. Acid hydrolysis is generally carried out by hydrolyzing with dilute sulfuric acid at a certain temperature, reducing nitrate nitrogen to ammonium with iron powder (or other reducing agent such as Darlington), oxidizing hydrolyzed organic nitrogen to ammonium with oxidant, and distilling to fix nitrogen. The alkaline hydrolysis method is further classified into an alkaline hydrolysis distillation method and an alkaline hydrolysis diffusion method. The alkaline hydrolysis distillation method is to use sodium hydroxide with certain concentration and a reducing agent to carry out alkaline hydrolysis and distillation for nitrogen determination in a distiller; the alkaline hydrolysis diffusion method comprises the steps of preserving heat of soil, sodium hydroxide solution and a reducing agent in a diffusion dish at 40 ℃ for 24 hours, simultaneously carrying out hydrolysis, reduction, diffusion and absorption, finally titrating with acid standard solution, and calculating hydrolyzable nitrogen, also called alkaline hydrolysis nitrogen. The correlation between the measurement result of the acid hydrolysis method on the low organic matter soil and crops is not ideal, and the two existing measurement methods are complex in measurement steps, long in measurement time, and unsuitable for large-scale rapid measurement requirements, and chemical reagents are required.
Therefore, there is a need in the art to develop a method and system for rapidly, efficiently and accurately predicting the hydrolyzable nitrogen in soil, particularly soil, without using chemical reagents.
Disclosure of Invention
Based on the blank of the prior art in the field, the invention provides a soil hydrolyzable nitrogen prediction method and system based on near infrared spectrum.
The technical scheme of the invention is as follows:
a method for calculating soil hydrolyzable nitrogen based on near infrared spectrum is characterized in that the following formula I is adopted to calculate the content of hydrolyzable nitrogen in soil in a target area:
formula I:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59；
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x1、x2……x59The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
The number of points of the characteristic wave band of the near infrared spectrum refers to:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Represents 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1The number of points of a wave band; x is the number of23Represents 5385.358cm-1Number of points in a band；x24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Represents 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1The number of points of a wave band; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
The number of points of the characteristic wave band of the near infrared spectrum is a value measured by the soil in the target area under the near infrared spectrometer.
The dimension of the soil hydrolyzable nitrogen is mg/kg. The meaning is as follows: 1kg of soil contains about mg of hydrolyzable nitrogen.
A soil hydrolyzable nitrogen prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59；
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x1、x2……x59The number of points of the characteristic wave band in the near infrared spectrum data.
The number of points of the characteristic wave band in the near infrared spectrum data refers to:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Represents 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1The number of points of a wave band; x is the number of23Represents 5385.358cm-1The number of points of a wave band; x is the number of24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Representing 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1The number of points of a wave band; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
And the near infrared spectrum data is a value measured by the soil in the target area under a near infrared spectrometer.
The dimension of the soil hydrolyzable nitrogen is mg/kg.
A near infrared spectroscopy-based prediction system for soil hydrolyzable nitrogen comprising a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program is executed by a processor to execute the method for calculating the soil hydrolyzable nitrogen based on the near infrared spectrum.
The soil hydrolyzable nitrogen calculation method based on the near infrared spectrum, the soil hydrolyzable nitrogen prediction method based on the near infrared spectrum, or the soil hydrolyzable nitrogen prediction system based on the near infrared spectrum is used for 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 hydrolyzable nitrogen 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 hydrolyzable nitrogen of the soil as dependent variables, 59 characteristic bands substantially related to the content of the hydrolyzable nitrogen of the soil are obtained by screening from the near infrared spectrum of the soil, and finally a relational expression of 59 band points of the near infrared spectrum and the hydrolyzable nitrogen of the soil is obtained. Based on the relational expression, the invention provides a calculation method, a prediction method and a prediction system for the content of the hydrolyzable nitrogen in the soil, and the content of the hydrolyzable nitrogen in the soil in the target area can be calculated only by sampling the soil in the target area, measuring the near infrared spectrum data of the soil and substituting the data into the relational expression.
The method 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 hydrolyzable nitrogen content of the soil of each target area to obtain predicted values, measures the actual content of hydrolyzable nitrogen in the soil, namely the measured value, by a large number of conventional hydrolyzable nitrogen measuring methods, finds that the difference between the predicted values and the measured values is not significant, and fully proves that the prediction method has extremely high accuracy in the aspect of predicting the hydrolyzable nitrogen content of the soil. Moreover, the method and the system of the invention are adopted to calculate and predict the hydrolyzable nitrogen 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.
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 soil hydrolyzable nitrogen of the present invention
The group of embodiments provides a method for calculating soil hydrolyzable nitrogen based on near infrared spectroscopy. The present group of embodiments all have the following common features: calculating the content of hydrolyzable nitrogen in the soil of the target area by using the following formula I:
formula I:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, 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、x38、x39、x40、x41、x42、x43、x44、x45、x46、x47、x48、x49、x50、x51、x52、x53、x54、x55、x56、x57、x58、x59The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
In a specific embodiment, the number of points in the characteristic band of the near infrared spectrum refers to: and (3) measuring the spectral numerical value of the soil sample in the target area under the characteristic wave band in the infrared spectrum measured by the infrared spectrometer. The method comprises the following specific steps:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Representative 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1The number of points of a wave band; x is the number of23Represents 5385.358cm-1The number of points of a wave band; x is the number of24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Represents 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1The number of points of a wave band; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
In some embodiments, the number of points in the characteristic band of the near infrared spectrum is the number of points in the soil in the target region measured by the near infrared spectrometer.
In other embodiments, the soil hydrolyzable nitrogen is measured in mg/kg.
Group 2 example method for predicting soil hydrolyzable nitrogen of the present invention
The group of embodiments provides a soil hydrolyzable nitrogen prediction method based on near infrared spectroscopy. The present group of embodiments has the following common features: the method for predicting soil hydrolyzable nitrogen based on near infrared spectrum comprises the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x1、x2……x39The number of points of the characteristic wave band in the near infrared spectrum data.
In some embodiments, the number of points in the near infrared spectral data in the characteristic band refers to:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Represents 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1The number of points of a wave band; x is the number of23Represents 5385.358cm-1The number of points of a wave band; x is the number of24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Represents 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1The number of points of a wave band; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
In other embodiments, the near infrared spectral data is a value determined by a near infrared spectrometer for soil in the target area.
In a particular embodiment, the soil hydrolyzable nitrogen is measured in mg/kg.
In all embodiments of the invention, the soil is in particular tobacco-planting soil.
Group 3 example, prediction system of soil hydrolyzable nitrogen of the present invention
The group of embodiments provides a soil hydrolyzable nitrogen prediction system based on near infrared spectroscopy. All embodiments of this group share the following common features: the system for predicting soil hydrolyzable nitrogen 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 for calculating soil hydrolyzable nitrogen based on near infrared spectroscopy as provided in any one of embodiment 1.
Experimental example and accuracy verification of soil hydrolyzable nitrogen prediction method
Taking tobacco planting soil in different areas of different places as samples, and numbering; dividing the soil samples of each area into 6 groups, wherein 3 groups adopt a near-infrared spectrometer to measure the near-infrared spectrum data of the soil samples, acquiring the point value of a characteristic waveband, substituting the prediction method of the invention into a formula I to calculate the content of the hydrolyzable nitrogen in the soil, taking 3 groups as 3 repetitions, and averaging to obtain a predicted value of the content of the hydrolyzable nitrogen (as listed in a column of 'predicted value of hydrolyzable nitrogen content' in the following table 3);
in the other 3 groups, the soil hydrolyzable nitrogen content measurement is carried out by a method (a standard method, for example, the method described in the standard document "Kjeldahl determination of hydrolyzable nitrogen in soil" DB 64/T1734-;
specific values are shown in table 3 below:
TABLE 3
The two columns of data in table 3 above were input into SPSS statistical software for significance analysis, and the results are shown in table 4 below:
TABLE 4
As can be seen from table 3 above, the predicted value of the content of hydrolyzable nitrogen in the soil sample predicted by the prediction method of the present invention and the reference value actually measured by the conventional method (alkaline hydrolysis method) have an average value of relative deviation between two sets of data of 16.93%, and according to the general experience in the art, the result that the average value of relative deviation is below 20% is credible.
Moreover, the difference analysis results in table 4 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 difference between the soil hydrolyzable nitrogen content value obtained by prediction calculation by the soil hydrolyzable nitrogen prediction method of the present invention is not significant compared with the reference value actually measured by the standard method, and the prediction method of the present invention has accuracy.
Claims (10)
1. A method for calculating soil hydrolyzable nitrogen based on near infrared spectrum is characterized in that the following formula I is adopted to calculate the content of hydrolyzable nitrogen in soil in a target area:
formula I:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59；
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x1、x2……x59The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.
2. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum of claim 1, wherein the number of points in the characteristic band of the near infrared spectrum is:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Represents 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1Points of wave bandsCounting; x is the number of23Represents 5385.358cm-1The number of points of a wave band; x is the number of24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Represents 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1The number of points of a wave band; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
3. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum of claim 1 or 2, wherein the number of points in the characteristic band of the near infrared spectrum is the value measured by the near infrared spectrometer for the soil in the target area.
4. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 1 to 3, wherein the soil hydrolyzable nitrogen is measured in mg/kg.
5. A soil hydrolyzable nitrogen prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:
Y＝10.3098x1-42.4784x2+51.0755x3+28.0307x4+70.2843x5-45.5027x6-23.7491x7-24.4559x8-24.5916x9-24.3227x10-23.856x11-22.9758x12-21.539x13-20.2036x14-19.494x15-19.0637x16-31.7123x17-33.8618x18+43.0176x19-34.2903x20-13.4066x21+44.9829x22+48.1193x23+30.6831x24+34.7542x25+44.9715x26+19.3005x27-16.3375x28-18.388x29+25.3382x30+22.8391x31+20.861x32-22.6667x33+15.5656x34+16.9775x35+18.1029x36+20.147x37+20.4145x38+24.8051x39+27.0216x40+32.6909x41+33.4229x42+32.475x43+28.697x44-16.3851x45-42.8647x46-32.062x47-25.6364x48-48.7665x49-44.6191x50+49.7776x51-54.7819x52-47.6881x53+28.2085x54+36.8441x55+33.3235x56+34.5734x57+34.1352x58+34.21x59；
wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x1、x2……x59The number of points of the characteristic wave band in the near infrared spectrum data.
6. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to claim 5, wherein the number of points in the characteristic waveband in the near infrared spectrum data refers to:
x1represents 4118.215cm-1The number of points of a wave band; x is the number of2Represents 4156.382cm-1The number of points of a wave band; x is the number of3Represents 4240.349cm-1The number of points of a wave band; x is the number of4Represents 4526.602cm-1The number of points of a wave band; x is the number of5Represents 4599.119cm-1The number of points of a wave band; x is the number of6Represents 4637.286cm-1The number of points of a wave band; x is the number of7Represents 4866.288cm-1The number of points of a wave band; x is the number of8Represents 4870.104cm-1The number of points of a wave band; x is the number of9Represents 4873.921cm-1The number of points of a wave band; x is the number of10Represents 4877.738cm-1The number of points of a wave band; x is the number of11Represents 4881.554cm-1The number of points of a wave band; x is the number of12Represents 4885.371cm-1The number of points of a wave band; x is the number of13Represents 4889.188cm-1The number of points of a wave band; x is the number of14Represents 4893.004cm-1The number of points of a wave band; x is the number of15Represents 4896.821cm-1The number of points of a wave band; x is the number of16Represents 4900.638cm-1The number of points of a wave band; x is the number of17Represents 5205.974cm-1The number of points of a wave band; x is the number of18Represents 5209.79cm-1The number of points of a wave band; x is the number of19Represents 5232.69cm-1The number of points of a wave band; x is the number of20Represents 5263.224cm-1The number of points of a wave band; x is the number of21Represents 5305.208cm-1The number of points of a wave band; x is the number of22Represents 5381.542cm-1The number of points of a wave band; x is the number of23Represents 5385.358cm-1The number of points of a wave band; x is the number of24Represents 5389.175cm-1The number of points of a wave band; x is the number of25Represents 5419.708cm-1The number of points of a wave band; x is the number of26Represents 5469.326cm-1The number of points of a wave band; x is the number of27Represents 5476.959cm-1The number of points of a wave band; x is the number of28Represents 5702.144cm-1The number of points of a wave band; x is the number of29Represents 5705.96cm-1The number of points of a wave band; x is the number of30Represents 5763.211cm-1The number of points of a wave band; x is the number of31Represents 5774.661cm-1The number of points of a wave band; x is the number of32Represents 5778.478cm-1The number of points of a wave band; x is the number of33Represents 5843.362cm-1The number of points of a wave band; x is the number of34Represents 5904.429cm-1The number of points of a wave band; x is the number of35Represents 5908.246cm-1The number of points of a wave band; x is the number of36Represents 5912.062cm-1The number of points of a wave band; x is the number of37Represents 5915.879cm-1The number of points of a wave band; x is the number of38Represents 5923.512cm-1The number of points of a wave band; x is the number of39Represents 5942.596cm-1The number of points of a wave band; x is the number of40Represents 5946.413cm-1The number of points of a wave band; x is the number of41Represents 5965.496cm-1The number of points of a wave band; x is the number of42Represents 5969.313cm-1The number of points of a wave band; x is the number of43Represents 5973.129cm-1The number of points of a wave band; x is the number of44Represents 6984.554cm-1The number of points of a wave band; x is the number of45Represents 7041.804cm-1The number of points of a wave band; x is the number of46Represents 7045.621cm-1The number of points of a wave band; x is the number of47Represents 7072.338cm-1The number of points of a wave band; x is the number of48Represents 7076.155cm-1The number of points of a wave band; x is the number of49Represents 7160.122cm-1The number of points of a wave band; x is the number of50Represents 7163.938cm-1The number of points of a wave band; x is the number of51Represents 7194.472cm-1The number of points of a wave band; x is the number of52Represents 7282.256cm-1The number of points of a wave band; x is the number of53Represents 7331.873cm-1Of wave bandsCounting; x is the number of54Represents 8579.933cm-1The number of points of a wave band; x is the number of55Represents 8614.283cm-1The number of points of a wave band; x is the number of56Represents 8633.366cm-1The number of points of a wave band; x is the number of57Represents 8656.267cm-1The number of points of a wave band; x is the number of58Represents 8660.083cm-1The number of points of a wave band; x is the number of59Represents 8663.9cm-1The number of points of the band.
7. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum of claim 5 or 6, wherein the near infrared spectrum data is a value measured by a near infrared spectrometer for soil in a target area.
8. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 5 to 7, wherein the soil hydrolyzable nitrogen is measured in mg/kg;
the soil is preferably tobacco planting soil.
9. A near infrared spectroscopy-based prediction system for soil hydrolyzable nitrogen comprising 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 calculating soil hydrolyzable nitrogen based on near infrared spectroscopy as claimed in any one of claims 1 to 4.
10. Use of the method for calculating soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 1 to 4, or the method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 5 to 8, or the system for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to claim 9 for detecting and screening soil.
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