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Title:   Author  item
                                            Gollany, Heroitem
                                            CLAPP, C - UNIV OF MINNESOTAitem
                                            MOLINA, JAE - UNIV OF MINNESOTAitem
                                            LINDEN, D - UNIV OF MINNESOTAitem
                                            Allmaras, Raymonditem
                                            LAYESE, M - UNIV OF MINNESOTAitem
                                            Dowdy, Robertitem
                                            CHENG, H - UNIV OF MINNESOTA
  Submitted to: USDA Symposium on Natural Resource Management to Offset Greenhouse Gas Emissions
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 7/15/2002
                                    Publication  Date: 11/19/2002
                                    Citation: GOLLANY, H.T., CLAPP, C.E., MOLINA, J., LINDEN, D.R., ALLMARAS, R.R., LAYESE, M.F., DOWDY, R.H., CHENG, H.H. NITROGEN LEACHING AND DENITRIFICATION AS A FUNCTION OF RESIDUE MANAGEMENT AND NITROGEN FERTILZER RATES IN THE CONTINUOUS CORN SYSTEM. USDA SYMPOSIUM ON NATURAL RESOURCE MANAGEMENT TO OFFSET GREENHOUSE GAS EMISSIONS. 2002.Interpretive Summary:
                                Technical Abstract: Maintaining crop production level with reductions in terrestrial greenhouse gases requires effective residue and fertilizer management.  Our objectives were to: 1) quantify the effect of nitrogen (N) application rates on N losses; 2) examine the role of residue returned on N transformation and losses; and 3) verify the capability of the NCSWAP/NCSOIL model to simulate the dynamics of N and N^15 in the soil-plant system.  A long-term continuous corn study was initiated on a silt loam soil in 1980 at Rosemount, MN.  Conventional tillage plots with two levels of application rates (20 and 200 kg N/ha) and two types of residue management (residue removed, and residue returned) were used to calibrate the model.  For the same amount of N15 added (0.8 kg N^15/ha), concentrations of N^15 in the corn and soil organic matter (SOM) were higher for the 20 than the 200 kg N/ha treatments.  The model accurately predicted N^15 in the SOM at 0- to 15-cm depth for both fertilizer rates and residue management.  The predicted cumulative N loss during 30-years simulation indicates more NO_3 leaching to below 1m-depth for residue removed than residue returned plots, while higher denitrification rates were predicted for the residue returned than residue removed.


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