Submitted to: North Central Extension Industry Soil Fertility Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: November 29, 2011
Publication Date: November 29, 2011
Citation: Hatfield, J.L., Parkin, T.B. 2011. Nitrogen management: Unraveling the effects of timing and form. North Central Extension Industry Soil Fertility Conference Proceedings. 27:42-48. Technical Abstract: Improvement of nitrogen use efficiency by corn production would decrease the potential for nitrogen loss into the environment. A study has been conducted in Ames, Iowa on 16 different forms and rates of nitrogen in both a continuous corn and corn-soybean production systems. There were differences among treatments; however, the most consistent treatment was the SuperU applied as a 150 lb A**-1 preplant or as 50 lb A**-1 preplant and 100 lb A**-1 sidedress and UAN with Agrotain added to both the 50 lb A**-1 preplant and 100 lb A**-1 sidedress nitrogen applications. In these treatments there was increased leaf chlorophyll content along with a greater duration of green leaf area during the grain-filling period compared to the responses in the other forms. The result of this change was a larger weight per 100 seed. The effect of stabilized forms of nitrogen has a positive physiological impact on corn and this increased the efficiency of grain development. Understanding the effects of forms of nitrogen will be enhanced by focusing on the physiological processes along with the yield components.