Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Tracking N Use Efficiency with 15n Labeling of Corn

Authors
item Weyers, Sharon
item Johnson, Jane
item Olness, Alan
item Clapp, Charles
item Wilts, Alan
item Rinke, Jana
item Barbour, Nancy

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: November 16, 2006
Publication Date: November 16, 2006
Repository URL: http://ars.usda.gov/SP2UserFiles/Place/36450000/Products-Reprints/2006/1358.pdf
Citation: Lachnicht Weyers, S.L., Johnson, J.M., Olness, A.E., Clapp, C.E., Wilts, A.R., Rinke, J.L., Barbour, N.W. 2006. Tracking N use efficiency with 15N labeling of corn [abstract][CD-ROM] ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting. Nov. 12-16, 2006, Indianapolis, IN.

Technical Abstract: Nitrogen management is an important issue for economic and environmental sustainability. We designed an experiment in two phases: 1) the growth phase to determine the impact of herbivore pressure on N uptake and 2) the decomposition phase to determine recovery in a second crop from separately decomposing above and below ground residue. Canopy enclosures and insecticides were used to exclude herbivorous insects. We used 15N labeled ammonium sulfate as the initial fertilizer source of N for the first corn crop. 15N uptake and %N of plant tissue were greater under canopy exclosures than under open conditions; however, yields were still substantially higher under open conditions. During the decomposition phase greater %N in the decomposing tissue had an impact on final yield and net N mineralized during the growing season.

Last Modified: 4/19/2014