Listen along as guest presenter Jeremy Swanson of Agronomy Rx (Webster City, IA) discusses several aspects of nitrogen and its proper use in your agronomy program.
2:31 Jeremy's nitrogen presentation begins
3:49 Introduction to the different types of nitrogen used in farming
6:05 Discussion of UAN and its 3 components
8:40 How to protect against the offgassing of urea
11:12 Biological reactions that convert nitrogen into plant-available forms
12:40 The role of carbon in holding nitrogen in the soil
18:15 Preferred nitrogen sources (and why)
23:23 Products/strategies to reduce leaf burn from nitrogen application
24:55 When to apply various forms of nitrogen
33:00 Importance of sulfur to corn germination
36:25 Importance of amino acids; plant-based amino acids as nitrogen source
41:33 Notes on sulfur use
47:42 When is it too late to apply nitrogen?
50:23 Floury vs. flinty corn and nitrogen applications
52:32 Importance of healthy microbial populations in the soil
59:55 Importance of balanced soil biology to crop health
1:15:00 Relationship between potassium and nitrogen; "luxury consumption" and lower yields
1:23:23 Soil fungi and plant health: Mother Nature's "clean up crew"
1:29:55 Why is ammonium important for grain fill? 
1:49:50 Importance of oxygen to soil and plant health
1:54:25 Relationship of carbon and nitrogen: why add a carbon source with nitrogen applications?
2:03:28 Yield loss resulting from foliar pesticide applications