I have an area of alwer rajasthan (India). i have only soil maps in which i can only see the soil type such as i have three type of soil as red sandy, red gravelly and older alluvial soil.
Can i use any pedotransfer function such as Rosetta for predicting soil properties. So i can edit the SNAME in soil database for preparing a lookup table for Arc SWAT for Indian soils.
please give your suggestions. Is It really helpful for Indian context?
Excuse me for my english. For the identification to genera soils have to do chemical analysis of soils.
For differences species of soils have to do granulometric analysis of soils.
Dear Praveen,
It is not clear which soil data you need for your study. Rosetta can be used to generate some hydraulic properties of soil (say, saturated hydraulic conductivity or water retention parameters) from sand/silt and clay%. But you need to get those basic data from your maps, if possible
Yes I agree with colleagues, ROSETA requires minimum data for the predicted hydraulic properties to be meaningful. In this case you need minimum data on soil textural analysis (%sand, %silt, %clay or textural classification (USDA)) in addition to improve on accuracy you need bulk density, organic matter, salinity etc. This information can be collected from representative soil profiles for the selected study area. I am sure there should be already some soil survey reports available where this information can be extracted. Hope this is not complicating your study!
Dear Praveen,
ROSETTA which was developed by Schaap et al is more appropriate for north American and also European soils. Cautions should be considered for using such kinds of pedotransfer-based software in areas apart from America and Europe. I recommend to use this software as an initial guess but not more.
Hope it helps,
Amir
Dear Praveen, the question is that the PTF must be evaluated with data measured, and where is necessary calibrated. Tecnically, before to use the hydraulic properties (HP) estimated by PTF in a simulation model, you need to compare the hydraulic properties measured of your soils (for each horizon) with the estimated from different PTFs, identifying the best one for your case study. None PTF can be considered proper to estimate the hydraulic properties of all soils of world. The PTF are produced starting from soil database (e.g. HYPRES from european soil dataset.. ) and not always the increase of parameters used inside means a better estimation of HP for your specific case study. You have to test they. Just for example, you can have an andosol with the same textural classes of an Inceptisol, then, if you use a PTF you will have the same hydraulicc parameterization for both soil. But in real, the physical system of these two soil are very different and you can see this different only if you measure the HP. Finally my opinion is that you need to test the PTF and find the best one for your case study, but at same time you need an help from pedologist or Hydropedologist to better understand the soil systems that you want to simulate.
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