Detect a bit of bias against anhydrous. You have to make anhydrous before you can make anything else. Your students need to start here http://www.energy.iastate.edu/Renewable/ammonia/ammonia.htm Anhydrous defines a path to the hydrogen economy. The UP has a locomotive that runs on it. In one of the symposia, there is a review on the safety of anhydrous. Then, they need to go here http://www.isafarmnet.com/ and have them review several years worth of on-farm strip trial information comparing the efficacy of different forms of nitrogen. There are reasons why different forms of nitrogen have different efficiencies. While they are at it, they can look at the N-serve data to see if it makes any difference. Only reason to put N on in the Fall is because that is the way that Dad did it.