Soil moisture content detection method based on TDR (time domain reflectometry)

A soil water content, time domain reflectometer technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of destroying the original sample, inconvenient operation, trouble, etc., and achieve the effect of accurate measurement

Inactive Publication Date: 2017-12-15
NINGXIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its operation is very inconvenient. It needs to dig soil and weigh it, and then dry it for 6-8 hours before weighing it, which is very troublesome.
The original sample will be destroyed during the excavation process, so it cannot be used for in-situ monitoring, and it is not convenient to obtain a large amount of continuous data
Although the neutron method can measure accurate and rapid data, it will be harmful to human health due to radiation, so it is basically eliminated.

Method used

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  • Soil moisture content detection method based on TDR (time domain reflectometry)
  • Soil moisture content detection method based on TDR (time domain reflectometry)
  • Soil moisture content detection method based on TDR (time domain reflectometry)

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Experimental program
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Embodiment

[0025] The sampling point of this test is located in the irrigation area of ​​the Yellow River Diversion in Ningxia, using indoor calibration, "from wet to dry" soil column experiment. The specific steps of the test are as follows:

[0026] S1. First, after sampling at the sampling point using the five-point sampling method, spread out the collected soil samples, put them in a cool place indoors to air dry, break them up manually, remove roots, weeds, gravel, etc., pass through a 2mm soil sieve, fill Put it into a PVC round barrel;

[0027] S2. Draw a line every 5 cm inside the PVC round bucket, draw 6 scales totaling 30 cm, and then ram the soil layer by layer for each scale until it reaches 30 cm. The amount of rammed soil each time is calculated according to the following formula:

[0028] Known soil bulk density ρ = 1.5g / cm 3 , PVC pipe radius r=19.2cm, so every 5cm need to add soil m=πr 2 h×ρ=3.14×9.6 2 ×5×1.5×10 -3 =2.17kg; a total of 30cm needs to be added: M=6×m=1...

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Abstract

The invention discloses a soil moisture content detection method based on a TDR (time domain reflectometry). A collected soil sample is spread and aired in a shade place, the aired soil sample is manually broken off with hands, impurities are removed, and the soil sample passes through a 2 mm soil sieve and put into a round PVC barrel; marks are made in the round PVC barrel at the interval of 5 mm, six scale marks are 30 m in total, and then, soil is compacted for each scale mark layer by layer until the soil is 30 cm high; after the soil column is filled and compacted, the soil is saturated after moisture enters the soil, a container is weighed on an electronic balance, bottom moisture is required to be toweled off before weighing, and numerical values are recorded; after weighing, the TDR is inserted in the soil column, a probe inserting point is the center of the soil column, then measurement is performed once every 3-5 h, and weighing is performed during measurement; TDR data are corrected by the following linear function: y=0.2769+0.0554 (R2=0.9668), wherein x is the moisture content measured by the TDR while y is the actual moisture content of the soil.

Description

technical field [0001] The invention relates to the field of soil moisture detection, in particular to a soil moisture detection method based on a time domain reflectometer. Background technique [0002] Soil water content is a routine item in soil analysis, and it is an essential basic data in water cycle research and farmland irrigation and drainage management. The dynamic change of farmland soil moisture directly reflects the water supply and demand of crops. Rapid and accurate measurement of farmland soil moisture is of great significance for ascertaining the profit and loss of soil moisture during crop growth and development, so as to make timely irrigation, fertilization decisions or drainage measures. . [0003] At present, the methods for measuring soil moisture content mainly include drying method, tensiometer method, electrical resistance method, neutron method, etc., and various methods have different applications. However, with the continuous improvement of peo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G01N5/00
CPCG01N27/00G01N5/00
Inventor 白一茹王幼奇赵云鹏张兴
Owner NINGXIA UNIVERSITY
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