#earth test

[devulove-blog]

ಕಡ್ಡಾಯವಾಗಿ ಮಣ್ಣಿನ ಪರೀಕ್ಷೆ ಮಾಡಿಸಿ: ಕೃಷಿ ಇಲಾಖೆ ಸಹಾಯಕ ನಿರ್ದೇಶಕ ಪ್ರಸಾದ್

ಪಿರಿಯಾಪಟ್ಟಣ: ರೈತರು ಕೃಷಿಯಲ್ಲಿನ ಉತ್ಪಾದನೆ ಮತ್ತು ಫಲವತ್ತತೆಯನ್ನು ಹೆಚ್ಚಿಸಿಕೊಳ್ಳಲು ಮಣ್ಣಿನ ಪರೀಕ್ಷೆ ಅತ್ಯಗತ್ಯ ಹಾಗಾಗಿ ಕೂಡಲೇ ಮಣ್ಣಿನ ತಪಾಸಣೆ ಮಾಡಿಸುವಂತೆ ತಾಲೂಕು ಸಹಾಯಕ ಕೃಷಿ ನಿರ್ದೇಶಕ ಪ್ರಸಾದ್ ಮನವಿ ಮಾಡಿದರು. ತಾಲೂಕಿನ ಬಸಲಾಪುರ ಗ್ರಾಮದಲ್ಲಿ ಜವರೇಗೌಡ ಎಂಬುವ ರೈತರ ಜಮೀನಿನಲ್ಲಿ ಆಯೋಜಿಸಿದ್ದ ಮಣ್ಣಿನ ಮಾದರಿ ಸಂಗ್ರಹಣೆ ಕುರಿತ ಪ್ರಾತ್ಯಕ್ಷಿಕೆ ಕಾರ್ಯಕ್ರಮದಲ್ಲಿ ಮಾತನಾಡಿದರು. ರೈತ ಅನ್ನ ನೀಡುವ ಭೂಮಿಗೆ ಅಗತ್ಯ ಪೋಷಕಾಂಶಗಳನ್ನು ನೀಡುವ ಬದಲಾಗಿ ಅಧಿಕ ಉತ್ಪಾದನೆಯ…

ಕಡ್ಡಾಯವಾಗಿ ಮಣ್ಣಿನ ಪರೀಕ್ಷೆ ಮಾಡಿಸಿ: ಕೃಷಿ ಇಲಾಖೆ ಸಹಾಯಕ ನಿರ್ದೇಶಕ ಪ್ರಸಾದ್

[bhoojalsurvey]

Soil resistivity test

What is Soil Resistivity Test?

Soil Resistivity is most necessary when determining the design of the grounding system for new installations  to meet your ground resistance requirements. Ideally, you would find a location with the lowest possible resistance. But as we discussed before, poor soil conditions can be overcome with more elaborate grounding systems.

The soil composition, moisture content, and temperature all impact the soil resistivity. Soil is rarely homogenous and the resistivity of the soil will vary geographically and at different soil depths.

Moisture content changes seasonally, varies according to the nature of the sub layers of earth, and the depth of the permanent water table. Since soil and water are generally more stable at deeper strata, it is recommended that the ground rods be placed as deep as possible into the earth, at the water table if possible. Also, ground rods should be installed where there is a stable temperature, i.e. below the frost line.

For a grounding system to be effective, it should be designed to withstand the worst possible conditions.

What is Wenner method for soil resistivity test ?

The Wenner method is a geophysical exploration technique used to measure soil resistivity and rock resistivity:

Soil resistivity

The Wenner method is a common, reliable, and inexpensive way to measure soil resistivity at depth. It's also known as the four-terminal method. The method involves placing four electrodes in a straight line, equally spaced, and injecting a known current into the two outermost electrodes. The voltage between the two inner electrodes is then recorded. The potential is divided by the injected current to calculate the apparent resistance, or ρa.

Rock resistivity

The Wenner method can also be used to measure rock resistivity. Rocks with higher resistivity are more difficult for electric current to flow through

Setup for soil resistivity testing using Wenner 4 point method.

The Wenner method was developed by Dr. Frank Wenner in 1915. The process for conducting a Wenner test includes:

Determining the desired length of the probe

Setting up the electrodes

Driving the electrodes into the ground

Connecting a resistivity meter or multi-meter to the electrodes

Taking a reading

Process for conducting a Wenner probe test

The electrodes should be spaced a set distance apart, typically 20 cm, 50 cm, or 100 cm. The center two electrodes are the current electrodes, and the outer two electrodes are the potential electrodes.

Connect the resistivity meter or multi-meter to the electrodes. The meter should be connected to the current electrodes and the potential electrodes.

Take a reading. The resistivity meter will measure the resistance between the current electrodes and the potential electrodes.

Repeat the process at multiple locations to get a representative sample of the soil.

Calculate the average resistivity of the soil using the readings from each location.

How do I Calculate Soil Resistivity?

Soil resistivity can be calculated using wenner method

Soil resistivity test formula

ρ = 2πar

Where ρ = Resistivity

a = Depth traversed / spacing between electrodes

r = resistance value observed

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