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|Author||Topic:Relationship between N03 and EC/pH between soil water compounds and other samples||1219 Views|
30 June 2011 at 12:53pm
Does any relationship exist between soil water compounds content (NO3, etc) and EC/pH between Drainage water (taken by lysimeters), soil pore solution through suction cups and soil water extracted from a saturated soil sample (saturated paste)?
1 July 2011 at 9:48am
I haven't seen any data on this, but soil water content is one of the determining factors for solute concentration in the soil. I would expect the 2 analyses to correlate very well at soil water potentials higher than -33 kPa, but not so well as the soil gets drier. Highly soluble solutes such as nitrates will probably be very consistent on a [NO3-]/g of dry soil basis, but it is difficult to put a volume of effect on the sampling region of the pore water samplers. It might be possible with tensiometer control and some clever maths though.
What do you think Leo?
1 July 2011 at 2:22pm
I can't really add much more to this then what Chris said. You can probably find some literature out there on this. If you were to use tensiometer controlled extraction you would probably have closer matched data to that of a Lysimeter if it is a controlled tension lysimeter. If it is a drainage lysimeter at zero tension then you are going to introduce a boundary layer which will likely alter the results because of divergence issues and the fact that you are completely changing the way the soil above the lysimeter retains water.
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