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Modeling in-situ N Mineralization from Cover Crops in a Georgia Ultisol Lisa Woodruff

Summary: 1
Modeling in-situ N Mineralization from Cover Crops in a Georgia Ultisol
Lisa Woodruff
Advanced Crop and Soil Sciences Seminar
Wednesday, March 23, 2011 at 3:35 pm
Miller Plant Sciences Building, Room 2401
Accurately estimating the amount of plant-available N from soil and crop residues is
important for N management in cropping systems. The ability to accurately estimate the amount
of N from cover crop mulch that will become plant available could help reduce over and under
application of mineral fertilizers and help smallholder farmers maximize the critical services that
organic inputs provide in regards to agricultural productivity. Estimating the amount of N that
will be mineralized from cover crop residues is challenging because of the complexity of the
process and the variety of factors involved, including residue quality, temperature, water content,
drying and rewetting events, and soil characteristics. Because many factors are involved in the
mineralization process, simulation models are useful tools for estimating N mineralized from
cover crops. Some of the most widely used models for simulating an entire crop-soil system are
CERES models. Previous work in Georgia showed that the N subroutine of the DSSAT
(Decision Support System for Agrotechnology Transfer) family of models, CERES-N, could be
calibrated to provide good estimates of N released from rye (Secale cereal L.), wheat (Triticum
aestivum L.), oats (Avena sativa L.), and crimson clover (Trifolium incarnatum L.) residues


Source: Arnold, Jonathan - Nanoscale Science and Engineering Center & Department of Genetics, University of Georgia


Collections: Biotechnology