HR: 17:00h
AN: H54D-05    [Abstracts]
TI: Winter Cover Crop Effects on Nitrate Leaching in Subsurface Drainage as Simulated by RZWQM-DSSAT
AU: Malone, R W
EM: rob.malone@ars.usda.gov
AF: USDA-ARS National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011, United States
AU: * Chu, X
EM: chux@gvsu.edu
AU: Ma, L
AF: USDA-ARS Agricultural System Research Unit, 2150 Centre Avenue, Building D, Fort Collins, CO 80526, United States
AU: Li, L
AF: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, No. 11 A Datun Road, Beijing, 100101, China
AU: Kaspar, T
AF: USDA-ARS National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011, United States
AU: Jaynes, D
AF: USDA-ARS National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011, United States
AU: Saseendran, S A
AF: USDA-ARS Agricultural System Research Unit, 2150 Centre Avenue, Building D, Fort Collins, CO 80526, United States
AU: Thorp, K
AF: USDA-ARS National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011, United States
AU: Yu, Q
AF: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, No. 11 A Datun Road, Beijing, 100101, China
AB: Planting winter cover crops such as winter rye (Secale cereale L.) after corn and soybean harvest is one of the more promising practices to reduce nitrate loss to streams from tile drainage systems without negatively affecting production. Because availability of replicated tile-drained field data is limited and because use of cover crops to reduce nitrate loss has only been tested over a few years with limited environmental and management conditions, estimating the impacts of cover crops under the range of expected conditions is difficult. If properly tested against observed data, models can objectively estimate the relative effects of different weather conditions and agronomic practices (e.g., various N fertilizer application rates in conjunction with winter cover crops). In this study, an optimized winter wheat cover crop growth component was integrated into the calibrated RZWQM-DSSAT hybrid model and then we compare the observed and simulated effects of a winter cover crop on nitrate leaching losses in subsurface drainage water for a corn-soybean rotation with N fertilizer application rates over 225 kg N ha-1 in corn years. Annual observed and simulated flow-weighted average nitrate concentration (FWANC) in drainage from 2002 to 2005 for the cover crop treatments (CC) were 8.7 and 9.3 mg L-1 compared to 21.3 and 18.2 mg L-1 for no cover crop (CON). The resulting observed and simulated FWANC reductions due to CC were 59% and 49%. Simulations with the optimized model at various N fertilizer rates resulted in average annual drainage N loss differences between CC and CON to increase exponentially from 12 to 34 kg N ha-1 for rates of 11 to 261 kg N ha-1. The results suggest that RZWQM-DSSAT is a promising tool to estimate the relative effects of a winter crop under different conditions on nitrate loss in tile drains and that a winter cover crop can effectively reduce nitrate losses over a range of N fertilizer levels.
DE: 0402 Agricultural systems
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting