Controlled Release Nitrogen in Corn

We laid out one of our test plots this week. Pioneer P2024VBT was planted on March 20th. We went on to get a 4" rain after planting on March 21. These heavy rainfall events on sandy soils is why I'm looking at the application of controlled release nitrogen fertilizer. It is randomized replicated small plots of 4 rates of control release nitrogen, a control with no added nitrogen, and a conventional treatment with 4 applications of quick release Nitrogen. Dealers now have the ability to custom blend polymer coated urea, with quick release fertilizers like the Ammonium Sulfate I used. The cover crop was rye, ryegrass, clover, peas, and radish. 

I've used ESN, a brand of controlled release nitrogen, as a sidedress application. I dont think that product matched the application timing and crop nitrogen demand. I would like to offer farmers better recommendations on how to use this technology to make higher yields, reduce application costs, reduce fertilizer costs, and reduce losses to groundwater.