CN104034861A - Method and device for measuring soil bulk density in real time - Google Patents
Method and device for measuring soil bulk density in real time Download PDFInfo
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- 238000001028 reflection method Methods 0.000 claims abstract description 10
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- 238000012271 agricultural production Methods 0.000 description 1
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- G—PHYSICS
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- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
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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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Abstract
The invention provides a method for measuring soil bulk density in real time. The method comprises the following steps of measuring soil under an undisturbed soil condition on line; acquiring a voltage signal of soil moisture volume percentage through a frequency domain reflection method, and determining the value of the soil moisture volume percentage through a calibration test method; acquiring the original spectral data of soil moisture weight percentage through a visible light-infrared reflection method, preprocessing the original spectral data and then substituting the data into a regression model preset in a system to calculate the soil moisture weight percentage; converting the soil bulk density from the soil moisture volume percentage and the soil moisture weight percentage. The invention also provides a device for measuring the soil bulk density. The device comprises a conical rod, a coaxial cable, an optical fiber, a soil moisture volume percentage probe, a soil moisture weight percentage probe, a soil moisture volume percentage detection module, a soil moisture weight percentage detection module and a panel computer. The method and the device which are provided by the invention can conveniently, fast and accurately obtain the soil bulk density of field soil at special section depth in real time without sampling the soil.
Description
Technical field
The present invention relates to agricultural land soil physical property fields of measurement, be specifically related to a kind of method and device of the real-time measurement soil weight.
Background technology
The soil weight, that is soil dry bulk density, the weight after the soil (comprising soil particle and interparticle pore) that is defined as a constant volume is dried and the ratio of co-content water weight.The size of the soil weight has reflected the height of soil texture, gas penetration potential, water permeability and water holding capacity, is an important parameter describing soil physical properties.Therefore, the Accurate Determining soil weight is significant to agricultural production and scientific research activity.
Measuring the most frequently used method of the soil weight is core cutter method.Its concrete method of operating is: the cutting ring of a constant volume is pounded to the soil under state of nature, soil sample is full of wherein, then take out soil sample and dry weighing, the dry ground weight in unit of account volume, is unit weight.Core cutter method takes time and effort, operating process complicated, and people are improved in this classic method.
Patent CN2585233 discloses a kind of Water-filled soil volume-weight determining device, it is comprised of graduated cylinder and water pocket, first digs out certain volume soil during measurement, then puts into water pocket and to its water-filling, by graduated cylinder, read water-filling volume, finally in conjunction with the soil dry quality of experimental determination, calculate the soil weight.Patent CN102721628 discloses a kind of method of measuring the soil weight, it puts into valve bag by the soil sample collecting, sealing after deflating, then measure sealing bag volume and can obtain soil sample volume, finally need to obtain soil dry quality by drying soil sample equally, and then calculate to obtain the soil weight.Obviously, these two kinds of methods all just improve to some extent measuring on soil volume, have overcome to a certain extent core cutter method and have been difficult to the shortcoming to the sampling of friable soil, but still needed sample back laboratory oven dry and weigh, and can not realize the real-time measurement of the soil weight.
Patent CN103558120 discloses a kind of method and soil weight of measuring the soil weight and has measured system, and its step comprises measures volumetric soil water content, weighing soil weight in wet base, mensuration soil volume, and then calculates soil dry bulk density.The method need to adopt respectively the devices such as soil moisture sensor, weighing-appliance and airtight container (band barometer) to obtain above-mentioned three parameters, and operation steps is complicated, is not easy to the field Fast Measurement soil weight.
Patent CN103592202 discloses a kind of volume displaced method and apparatus of measuring the soil weight and water percentage, gas hole in the water displacement soil of certain volume for its mode by water filling, and then obtain the soil weight and soil quality water percentage according to the Mass Calculation of the density of water and soil particle, incipient wetness pedotheque.Although the method is without soil sample is carried out to drying and processing, operating process and relevant apparatus are still aobvious complicated.
Above patent has been made improvement at different aspect to traditional soil weight measuring method, but all unavoidably soil is sampled, so both can damage undisturbed soil, makes again measuring process waste time and energy unavoidably.Therefore, study a kind of soil weight measuring method efficient, robotization very necessary.
Summary of the invention
The invention provides a kind of soil sample of can avoiding gathering, and realize the method to the original position Quick Measurement of the soil weight.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A soil weight method for real-time measurement, comprises the steps:
Step 1, the soil under on-line measurement undisturbed soil condition.
Step 2, gathers the voltage signal of volumetric soil water content by frequency domain reflectometry, and by rating test method, determines the value of volumetric soil water content.
Described frequency domain reflectometry is specially: using high-frequency signal as pumping signal, according to the principle of the theoretical middle impedance coupling of electromagnetic transmission, measure the HF voltage peak value at impedance matching circuit two ends, will after this voltage peak differential amplification, change into normal voltage output;
Step 3, the original spectrum data by visible ray-near-infrared reflection method collection soil quality water percentage, by the regression model of original spectrum data substitution systemic presupposition after pre-service, calculate soil quality water percentage.
Described visible ray-near-infrared reflection method is specially: the beam Propagation of light source is to soil quality water percentage probe, and wherein a part of light beam is absorbed by soil, and another part beam reflection is returned by the collection of visible ray-near infrared spectrometer and exported original spectrum data.
Soil quality water percentage regression model need to be set up under laboratory condition: the real quality water cut that obtains on the one hand soil sample by oven drying method; By above-mentioned visible ray-near-infrared reflection method, gather on the other hand the original spectrum data of soil quality water percentage, and original spectrum data obtain the characteristic spectrum data of soil quality water percentage after normalization and the pre-service of Savitzky-Golay smothing filtering, in conjunction with real quality water cut and characteristic spectrum data, by Multiple Regression Analysis Method, set up soil quality water percentage regression model.
Step 4, converses the soil weight by volumetric soil water content and soil quality water percentage, and this soil weight computing formula is
in formula: ρ
bfor the soil weight, unit is g/cm
3; θ is volumetric soil water content, and unit is cm
3/ cm
3; ω is soil quality water percentage, and unit is g/g.
The present invention also provides a kind of measurement mechanism of realizing soil weight method for real-time measurement in technique scheme, comprising:
The cone bar of hollow;
Be arranged at concentric cable and the optical fiber of described cone bar inside;
Be arranged at volumetric soil water content probe and the soil quality water percentage probe of described cone bar lower end;
Be arranged at volumetric soil water content detection module and the soil quality water percentage detection module of described cone bar upper end;
Described volumetric soil water content probe is connected to volumetric soil water content detection module by concentric cable, and described soil quality water percentage probe is connected to soil quality water percentage detection module by optical fiber;
Be arranged at the panel computer of described soil quality water percentage detection module top, for gathering the signal of described volumetric soil water content detection module and the output of soil quality water percentage detection module, and calculate respectively volumetric soil water content and soil quality water percentage, further calculate the soil weight, and various parameters are shown on screen.
Further, described volumetric soil water content probe, comprises conehead, becket and dead ring, and wherein conehead is connected to cone bar lower end, and dead ring is nested on cone bar, and becket is nested on dead ring.
Further, described volumetric soil water content detection module comprises high-frequency signal source, impedance matching circuit, detecting circuit and the microprocessor connecting successively, wherein microprocessor is connected with detecting circuit by differential amplifier circuit, and is connected with the signal input part of panel computer by communication interface.
Further, described soil quality water percentage detection module, comprises light source and visible ray-near infrared spectrometer; Described optical fiber comprises luminous source optical fiber and detection fiber, and wherein luminous source optical fiber is used for connecting light source and soil quality water percentage probe, and detection fiber is used for connecting soil quality water percentage probe and visible ray-near infrared spectrometer.
Preferably, this measurement mechanism also comprises and is arranged at described soil quality water percentage detection module below one side for determining the ultrasonic distance sensor fathoming; Be arranged at described soil quality water percentage detection module below opposite side for the GPS module in location survey place; And the handle that is arranged at described soil quality water percentage detection module both sides, double-grip while measuring for operator, to be pressed into conehead in soil.
From above technical scheme, the present invention adopts frequency domain reflectometry and visible ray-near-infrared reflection method respectively volumetric soil water content and soil quality water percentage to be carried out to signals collecting, and be input to and in panel computer, carry out computing and draw the soil weight, this measuring method and device, without soil is sampled, can obtain the soil weight under the field soil particular cross-section degree of depth easily and fast, in real time, exactly.In addition, owing to no longer needing to take soil sample, therefore measuring process can not destroyed the original state of agricultural land soil, and measuring system can also record many-sided information such as Measuring Time, place, depth profiled automatically, is convenient to agricultural land soil unit weight time space distribution to analyze and research.
Accompanying drawing explanation
Fig. 1 is the structural representation of soil weight real-time measurement apparatus of the present invention;
Fig. 2 is the electrical principle block diagram of soil weight real-time measurement apparatus of the present invention;
Fig. 3 is the process flow diagram of soil weight method for real-time measurement of the present invention;
Fig. 4 is the process flow diagram of soil quality measurement of water ratio method in the present invention.
In figure: 1, cone bar, 2, concentric cable, 3, optical fiber, 31, luminous source optical fiber, 32, detection fiber, 4, volumetric soil water content probe, 41, conehead, 42, becket, 43, dead ring, 5, soil quality water percentage probe, 6, volumetric soil water content detection module, 61, high-frequency signal source, 62, impedance matching circuit, 63, detecting circuit, 64, differential amplifier circuit, 65, microprocessor, 7, soil quality water percentage detection module, 71, light source, 72, visible ray-near infrared spectrometer, 8, panel computer, 9, ultrasonic distance sensor, 10, GPS module, 11, handle.
Embodiment
Below in conjunction with accompanying drawing, a kind of preferred implementation of the present invention is described in detail.
Fig. 1 shows the structural representation of a kind of soil weight real-time measurement apparatus of the present invention, and this measurement mechanism comprises the cone bar 1 of a hollow, its length H
1the maximum depth profiled that can measure is as required determined, in cone bar, is provided with concentric cable 2 and the optical fiber 3 that is respectively used to transmission of electric signals and light signal, and wherein optical fiber comprises luminous source optical fiber 31 and detection fiber 32.Cone bar 1 lower end is connected with volumetric soil water content probe 4, this volumetric soil water content probe is comprised of conehead 41, becket 42 and dead ring 43, wherein conehead is threaded in cone bar lower end, dead ring is positioned at conehead top and is nested on cone bar, becket is directly nested on dead ring, the cone angle of conehead is with reference to U.S. ASABE standard, get 30 degree, conehead and becket are made by stainless steel material, both form two electrodes of volumetric soil water content probe, dead ring is made by PVC material, for isolating conehead and becket and becket and cone bar.Cone bar 1 lower end is also provided with soil quality water percentage probe 5, and it is embedded in dead ring 43, and outside surface is concordant with cone bar surface.
Described measurement mechanism also comprises volumetric soil water content detection module 6 and soil quality water percentage detection module 7, is installed in box body and is arranged on cone bar 1 upper end.Described volumetric soil water content probe 4 is connected to volumetric soil water content detection module 6 by the concentric cable 2 being arranged in cone bar, and described soil quality water percentage probe 5 is connected to soil quality water percentage detection module 7 by the optical fiber 3 being arranged in cone bar.
Described soil quality water percentage detection module 7 lower end one sides are provided with ultrasonic distance sensor 9, it is comprised of ultrasonic transmitter and receiver two parts, by the definite ultrasonic distance sensor of mistiming between transmitting and reception ultrasound wave and the vertical range H between soil to be measured
2, can extrapolate the depth H of conehead 41 in soil
0=H
2-H
1, wherein H1 is that ultrasonic distance sensor 9 is to the level altitude on conehead 41 tops.Described soil quality water percentage detection module 7 below opposite sides are provided with GPS module 10, can select the GPS18X module of U.S. GARMIN company for location survey place, its built-in reception electric wire, and self-carried USB interface, can be by information outputs such as the longitude of measurement point, dimension and Measuring Time.Soil quality water percentage detection module 7 upper ends are provided with panel computer 8, it can move windows desktop operating system, be mainly used in gathering the signal of described volumetric soil water content detection module 6, soil quality water percentage detection module 7, ultrasonic distance sensor 9 and 10 outputs of GPS module, and calculate respectively volumetric soil water content and soil quality water percentage, further calculate the soil weight, and various parameters are shown on screen.The both sides of soil quality water percentage detection module 7 outside box bodys are run through and are provided with handle 11, play the effect of cone of support bar 1, and the top of cone bar is connected with handle 11 midpoint by screw thread.
As shown in Figure 2, volumetric soil water content detection module 6 comprises high-frequency signal source 61, impedance matching circuit 62, detecting circuit 63 and the microprocessor 65 connecting successively, and wherein microprocessor is connected with detecting circuit by differential amplifier circuit 64.Volumetric soil water content probe 4 is connected on impedance matching circuit 62 by being arranged at the concentric cable 2 of cone bar 1 inside, wherein conehead 41 is connected with the screen layer of concentric cable, becket 42 is connected with the core of concentric cable, connected mode is solderless and connects, conehead 41 and becket 42 form two electrodes of probe, the present embodiment medium is watered ground, utilize high-frequency signal source 61 to produce high-frequency signal, by concentric cable 2, be transferred in volumetric soil water content probe 4, utilize the impedance of soil and volumetric soil water content probe and the impedance mismatch of concentric cable 2 under high-frequency electric field to produce the voltage signal of decaying, the voltage amplitude of its evanescent voltage signal is relevant to the specific inductive capacity of watered ground, and soil dielectric constant can reflect soil water percentage.Described high-frequency signal source 61 is selected the sinusoidal wave active crystal oscillator of 100MHz; Impedance matching circuit 62 is equivalent to the transmission line of 1/4 wavelength, the voltage signal of energy transmission attenuation; Detecting circuit 63 detects the crest voltage at impedance matching circuit 62 two ends, and by differential amplifier circuit 64, is converted to 0-2.5V normal voltage and exports.Microprocessor 65 can adopt MSP430F149, and it gathers differential amplifier circuit 64 output voltage signals by 12 AD that carry, and this voltage signal is sent to and in panel computer 8, carried out subsequent treatment calculating by communication interface.
Described soil quality water percentage detection module 7 comprises light source 71 and visible ray-near infrared spectrometer 72, light source 71 outputs to light beam on soil quality water percentage probe 5 by being arranged at the luminous source optical fiber 31 of cone bar inside, wherein a part of light beam is absorbed and disappears by soil, part light beam is reflected back, and the latter is via detection fiber 32, can be detected by visible ray-near infrared spectrometer 72.Luminous source optical fiber 31 can adopt FC fibre-optical splice to be connected with detection fiber 32.Light source can adopt Halogen lamp LED, and visible ray-near infrared spectrometer can adopt the FieldSpec4Standard-Res spectrometer of U.S. ASD company, and it surveys wavelength coverage is 350-2500nm.The spectroscopic data that visible ray-near infrared spectrometer obtains will be sent in panel computer 8 and be processed by communication interface.
The present invention also provides a kind of soil weight method for real-time measurement, and as shown in Figure 3, this measuring method comprises the steps:
Step 1, the soil under on-line measurement undisturbed soil condition.In this step, first need to open measuring system, both hands are held handle, and conehead is pressed in soil, note when conehead arrives the degree of depth to be measured, stopping the data that fathom that show on panel computer pressing down simultaneously, make to bore bar and keep stable, vertical state.
Step 2, gathers the voltage signal of volumetric soil water content by frequency domain reflectometry, and by rating test method, determines the value of volumetric soil water content.
The measuring principle of volumetric soil water content is frequency domain reflectometry, the variation of sensor probe induction surrounding soil volumetric water content, and cause electrode ports impedance to change, and electrode ports impedance Z
pwith match circuit impedance Z
0between mismatch degree will be reflected in Z
0on voltage difference △ U between two ends,
wherein A is signal source voltage amplitude.
Detecting circuit detects the crest voltage at impedance matching circuit two ends, two-way rectified signal is converted to 0-2.5V normal voltage after being processed by differential amplifier circuit and exports, and being sent to panel computer by the communication interface of microprocessor, the actual value of volumetric soil water content can be determined and be drawn by rating test to the relation between this voltage signal and volumetric soil water content.Calibration process concrete operations are: first get soil sample to be measured, be mixed with the soil sample of different volumes moisture content level, and pack in plastic cylinder, then sensor is inserted in soil sample successively, record sensor output, and can obtain calibration curve after actual volume water percentage data fitting.
Step 3, the original spectrum data by visible ray-near-infrared reflection method collection soil quality water percentage, by the regression model of original spectrum data substitution systemic presupposition after pre-service, calculate soil quality water percentage.
What soil quality measurement of water ratio module was obtained is spectroscopic data, and it also need just can be converted to soil quality water percentage by regression model.With reference to Fig. 4, first need under laboratory condition, set up soil quality water cut prediction, by oven drying method, obtain on the one hand the real quality water cut of soil sample, on the other hand, adopt soil quality water percentage probe in the present invention to measure soil sample, by visible ray-near infrared spectrometer, obtain original spectrum data, then spectroscopic data is normalized and the pre-service such as Savitzky-Golay smothing filtering, and then obtain the characteristic spectrum data of soil quality water percentage.Wherein the computing formula of normalized is:
Wherein X (i, k) is raw data, X'(i, k) be normalization data.Savitzky-Golay smoothing filter is proposed in 1964 by Savitzky A and Golay M at first, be a kind of in time domain based on polynomial expression, by moving window, utilize least square method to carry out the method for best-fit.In conjunction with the data of real quality water cut and characteristic spectrum data two aspects, by Multiple Regression Analysis Methods such as partial least square method or artificial neural networks, set up soil quality water percentage regression model on this basis.When actual measurement, the original spectrum data of acquisition, by after the preprocessing process through same, are updated in the regression model of systemic presupposition, just can calculate in real time soil quality water percentage.
Step 4, has calculated volumetric soil water content and soil quality water percentage by said method, by soil weight computing formula
converse the soil weight, and all measurement parameters are preserved.
In formula: ρ
bfor the soil weight, unit is g/cm
3; θ is volumetric soil water content, and unit is cm
3/ cm
3; ω is soil quality water percentage, and unit is g/g.
The above embodiment is only that the preferred embodiment of the present invention is described; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (9)
1. a soil weight method for real-time measurement, is characterized in that comprising the steps:
Step 1, the soil under on-line measurement undisturbed soil condition;
Step 2, gathers the voltage signal of volumetric soil water content by frequency domain reflectometry, and by rating test method, determines the value of volumetric soil water content;
Step 3, the original spectrum data by visible ray-near-infrared reflection method collection soil quality water percentage, by the regression model of original spectrum data substitution systemic presupposition after pre-service, calculate soil quality water percentage;
Step 4, converses the soil weight by volumetric soil water content and soil quality water percentage, and this soil weight computing formula is
in formula: ρ
bfor the soil weight, unit is g/cm
3; θ is volumetric soil water content, and unit is cm
3/ cm
3; ω is soil quality water percentage, and unit is g/g.
2. measuring method according to claim 1, it is characterized in that, described step 2 frequency domain reflectometry is specially: using high-frequency signal as pumping signal, according to the principle of the theoretical middle impedance coupling of electromagnetic transmission, measure the HF voltage peak value at impedance matching circuit two ends, will after this voltage peak differential amplification, change into normal voltage output.
3. measuring method according to claim 1, it is characterized in that, in described step 3, visible ray-near-infrared reflection method is specially: the beam Propagation of light source to soil quality water percentage is popped one's head in, wherein a part of light beam is absorbed by soil, and another part beam reflection is returned by the collection of visible ray-near infrared spectrometer and exported original spectrum data.
4. measuring method according to claim 1, is characterized in that, the soil quality water percentage regression model in described step 3 need to be set up under laboratory condition: the real quality water cut that obtains on the one hand soil sample by oven drying method; By visible ray-near-infrared reflection method, gather on the other hand the original spectrum data of soil quality water percentage, and original spectrum data obtain characteristic spectrum data through pre-service, in conjunction with real quality water cut and characteristic spectrum data, by Multiple Regression Analysis Method, set up soil quality water percentage regression model.
5. a measurement mechanism of realizing soil weight method for real-time measurement described in claim 1, is characterized in that, comprising:
The cone bar (1) of hollow;
Be arranged at concentric cable (2) and the optical fiber (3) of described cone bar inside;
Be arranged at volumetric soil water content probe (4) and the soil quality water percentage probe (5) of described cone bar lower end;
Be arranged at volumetric soil water content detection module (6) and the soil quality water percentage detection module (7) of described cone bar upper end;
Described volumetric soil water content probe (4) is connected to volumetric soil water content detection module (6) by concentric cable (2), and described soil quality water percentage probe (5) is connected to soil quality water percentage detection module (7) by optical fiber (3);
Be arranged at described soil quality water percentage detection module top for collection signal and calculate the panel computer (8) of the soil weight.
6. measurement mechanism according to claim 5, it is characterized in that, described volumetric soil water content probe (4), comprise conehead (41), becket (42) and dead ring (43), wherein conehead is connected to cone bar lower end, dead ring is nested on cone bar, and becket is nested on dead ring.
7. measurement mechanism according to claim 5, it is characterized in that, described volumetric soil water content detection module (6) comprises high-frequency signal source (61), impedance matching circuit (62), detecting circuit (63) and the microprocessor (65) connecting successively, wherein microprocessor (65) is connected with detecting circuit (63) by differential amplifier circuit (64), and is connected with the signal input part of panel computer (8) by communication interface.
8. measurement mechanism according to claim 5, is characterized in that, described soil quality water percentage detection module (7) comprises light source (71) and visible ray-near infrared spectrometer (72); Described optical fiber (3) comprises luminous source optical fiber (31) and detection fiber (32), wherein luminous source optical fiber (31) is for connecting light source (71) and soil quality water percentage probe (5), and detection fiber (32) is for connecting soil quality water percentage probe (5) and visible ray-near infrared spectrometer (72).
9. measurement mechanism according to claim 5, is characterized in that, this measurement mechanism also comprises that being arranged at described soil quality water percentage detection module (7) below one side is used for determining the ultrasonic distance sensor (9) fathoming; Be arranged at described soil quality water percentage detection module (7) below opposite side for the GPS module (10) in location survey place; And the handle (11) that is arranged at described soil quality water percentage detection module (7) both sides.
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|---|---|---|---|
| CN201410245770.2A CN104034861B (en) | 2014-06-04 | 2014-06-04 | Soil weight method for real-time measurement and measurement mechanism thereof |
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| CN201410245770.2A CN104034861B (en) | 2014-06-04 | 2014-06-04 | Soil weight method for real-time measurement and measurement mechanism thereof |
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| CN104034861B CN104034861B (en) | 2016-05-04 |
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| CN106482975A (en) * | 2016-09-28 | 2017-03-08 | 长江水利委员会长江科学院 | A kind of drift in-situ sampling analysis and processing method |
| CN106645131A (en) * | 2017-01-24 | 2017-05-10 | 浙江工业大学 | Test paper type portable soil moisture content measurer |
| CN106771075A (en) * | 2016-12-29 | 2017-05-31 | 中环天仪（天津）气象仪器有限公司 | For the double automatic detection device and method of contact pin type soil moisture sensor |
| CN108449989A (en) * | 2015-06-15 | 2018-08-24 | 联邦科学与工业研究组织 | Edaphic condition analysis system and method |
| CN108871996A (en) * | 2018-08-28 | 2018-11-23 | 河北省农林科学院旱作农业研究所 | A kind of method of on-site measurement mass water content of soil and the soil weight |
| CN108918606A (en) * | 2018-07-26 | 2018-11-30 | 王亮亮 | Dielectric method measures the acquisition methods of the soil in-situ rating curve of soil moisture content |
| CN108982407A (en) * | 2018-07-06 | 2018-12-11 | 浙江大学 | A method of probing into the soil optimum moisture content of detection soil nitrogen using near infrared spectrum |
| CN109031266A (en) * | 2018-08-13 | 2018-12-18 | 山东农业大学 | A kind of evaluation method of Soil N-application volume |
| CN109342260A (en) * | 2018-12-19 | 2019-02-15 | 浙江大学 | A kind of soil moisture detection system and its detection method |
| CN111537567A (en) * | 2020-04-30 | 2020-08-14 | 中国农业科学院草原研究所 | Needle type soil moisture content detection method |
| CN114279973A (en) * | 2021-12-27 | 2022-04-05 | 南京大学 | Soil body water content in-situ monitoring method of transient temperature-changing fiber bragg grating based on artificial neural network |
| US20220341910A1 (en) * | 2021-04-21 | 2022-10-27 | Smart Rain Systems, LLC | In-ground wireless soil moisture sensor |
| CN118130343A (en) * | 2024-04-30 | 2024-06-04 | 广东海洋大学 | Method and system for detecting permeability of improved high-liquid-limit cohesive soil |
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| CN108449989A (en) * | 2015-06-15 | 2018-08-24 | 联邦科学与工业研究组织 | Edaphic condition analysis system and method |
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| CN106482975B (en) * | 2016-09-28 | 2019-05-24 | 长江水利委员会长江科学院 | A kind of sediment in-situ sampling analysis and processing method |
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| CN108982407A (en) * | 2018-07-06 | 2018-12-11 | 浙江大学 | A method of probing into the soil optimum moisture content of detection soil nitrogen using near infrared spectrum |
| CN108918606A (en) * | 2018-07-26 | 2018-11-30 | 王亮亮 | Dielectric method measures the acquisition methods of the soil in-situ rating curve of soil moisture content |
| CN109031266A (en) * | 2018-08-13 | 2018-12-18 | 山东农业大学 | A kind of evaluation method of Soil N-application volume |
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| CN111537567B (en) * | 2020-04-30 | 2023-09-08 | 中国农业科学院草原研究所 | Tubular needle type soil moisture content detection method |
| CN111537567A (en) * | 2020-04-30 | 2020-08-14 | 中国农业科学院草原研究所 | Needle type soil moisture content detection method |
| US20220341910A1 (en) * | 2021-04-21 | 2022-10-27 | Smart Rain Systems, LLC | In-ground wireless soil moisture sensor |
| US11674944B2 (en) * | 2021-04-21 | 2023-06-13 | Smart Rain Systems, LLC | In-ground wireless soil moisture sensor |
| CN114279973A (en) * | 2021-12-27 | 2022-04-05 | 南京大学 | Soil body water content in-situ monitoring method of transient temperature-changing fiber bragg grating based on artificial neural network |
| CN114279973B (en) * | 2021-12-27 | 2024-03-19 | 南京大学 | In-situ monitoring method for soil moisture content of transient variable-temperature fiber bragg grating based on artificial neural network |
| CN118130343A (en) * | 2024-04-30 | 2024-06-04 | 广东海洋大学 | Method and system for detecting permeability of improved high-liquid-limit cohesive soil |
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