Generally soil pH is measured by inserting electrode in soil suspension in distilled water or CaCl2, KCL solution. But by these methods insitu soil pH detrmination is not possible. Any suggestion?
There are several in situ specialized pH probes available in the market. In a quick glance, that would be the best bet, although they are likely much more expensive.
Is soil pH measured by these insitu probes is comparable with the standrad destructive pH determination?
It is extremely like that such comparisons do exist, however, I personally do not know them. I'm guessing it would be something similar to EC with a soil to water extractions vs in situ EC probes in which the differences relate more to differences in moisture content than on the actual method.
Try to find such products as IQ-150 and 160 for in-situ pH and Eh measurement. In my opinion, these meters are better for wetand soil measurements.
In 1937 McGeorge (l) first determined the pH of soils in situ with a spear-type glass electrode. In the early forties several papers(2–5) were devoted to factors affecting the measured value. The commonly accepted view was that the results were not very reliable if the water content of the soil was below a certain limit, say, the field capacity...
The method involves the use of a solid state pH electrode (ISFET) and a specially designed steel probe for introducing the electrode into the soil. The method has been developed and used at a waterlogged site, Nydam, Denmark. The same electrode has also been used to obtain detailed pH profiles during an archaeological excavation at Åmosen, Denmark.
Actually our main aim is to determine change of pH of rhizosphere upon precise application of certain chemicals or by chemical secretion by plant root over a period of time. Thanks Amit and all for your kind information. I guess i am enriched by the discussion.
If you intend to measure large areas, the best solution, that I am aware, is to use an on-the-go equipment commercialized by Veris technology in USA.
mobile pH meters are available and also probes can be used, but these are all expensive, alternatively we can use pH paper to know the wide range of pH in situ
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