Armstrong Research and Demonstration Farm
Nitrogen management and cropping system history (tillage and crop rotation) have direct impacts on soil organic nitrogen (N) and carbon (C) pools, and the tie between soil organic N and C. Specific organic-N pools in soil can be an important source of plant-available N. Nitrogen availability in the soil environment also plays a significant role in determining soil C status. The objectives of this project are to demonstrate corn N fertilization needs and the short- and long-term N–C relationships across diverse soils, productivity, and crop management systems; and to evaluate and demonstrate the potential of a new soil N test (the Illinois N Soil Test, which is based on a readily mineralized organic-N fraction – amino sugar-N) in Iowa.
Iowa State University
Sawyer, John E.; Al-Kaisi, Mahdi; Barker, Daniel W.; and Dittmer, Weston, "Soil Nitrogen and Carbon Management Project" (2002). Iowa State Research Farm Progress Reports. 1575.