Greg, They run 18 test with nitrogen being one of them. You can google Auburn University soil test lab and then go to Water analysis form and it list all 18 test. I dont recall his name, he was a bit hard to understand and I never did get his last name but his title was Doctor. A really nice guy you just had to listen carfully to him.Did not get my samples sent off last week but did collect them over the weekend and will send them off tomorrow. I will advise what I am told and the results. I am sending both a water and soil sample collected from several places off the pond bottom then mixed well and then a sample of that sent.