1. Residue and nitrogen dynamics in suppressed stands Karl Umiker and Jodi Johnson-Maynard University of Idaho

2. General research objectives: 1. Determine impacts of residue management strategies on nitrogen cycling. 2. Encourage timely residue decomposition.

3. What controls decomposition? 1. Organisms macro to microfauna, microflora 2.Climate 3.Residue status - C:N Approach: To understand the natural reactions that control residue decomposition. Residue decomposition:

4. Residue Carbon Decomposition Amount of carbon Size of residue Type of carbon –% Lignin Availability of nitrogen –how fast and how much

5. C:N Ratio of Materials

6. Site Descriptions Lewis Co. Site Non-thermal Alternate Year Fallow Variety: ‘Quantum Leap’ Treatments: -Fallow 02/Harvest 03 -Harvest 02/Fallow 03 mow -Harvest 02/Fallow 03 chem

7. Lewis Co. – ‘Quantum Leap’ Residue Winter Chem/Mow

8. Summary: Residue Amount Baling may not be necessary in all systems Alternate year fallow treatments at the Lewis Co. site are in the spring Variety and/or site-specific climate conditions may influence the success of non-thermal residue management practices