1 reply
bhera
almost 13 years ago

There are two basic methods
- The oldest uses a chemical reaction
- The newer method uses a pH meter and a spectrophotometer
The spectrophotometer passes a beam of light through a solution and measures the amount of light absorbed.
This method is expensive but fast and reliable.
Source: http://in.docsity.com/en-docs/Soil_Sampling_and_Testing_-_Soil_Technology_-_Lecture_Slides_pdf
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