Hi @Igor09 -
Apologies for the missing NDR sample data, since we do provide it for other models. I’m actually in the process of redoing our freshwater sample data, and NDR will be included. In the meantime, here is the sample data that we’ll be providing, from a watershed in Kenya called Gura. NDR_sample_data.zip (797.4 KB)
Note that the values in the biophysical table were selected for this particular watershed, and are only intended to be used for learning the model, they may not apply to your area of interest.
Yes, we usually use different values for N and P. P loading often has lower values than N, but it really depends on what kind of agriculture or other situation is in your watershed. Finding values for phosphorus/nitrogen application in agricultural areas is relatively easy to find. Values for natural vegetation are much less available. As mentioned in another post, the InVEST web page now has a link to a nutrient parameter database, which contains a non-exhaustive list of literature, and the N/P values they provide. It might have studies from your area, or you can use it as a first draft to create more global average values.