I need to do a leachate analysis from the irrigation water after fertilisation. Two questions regarding this:
1) Is there some type of search engine or the likes on where to find methodologies for chemical analyses etc. or how do you inform yourself on appropriate tests for your needs?
2) How can I test for NO3-, NH4+, PO43-, K+?
I would need to test for total amount in the solution aka total amount leached from soil.