Monday, 7 November 2005
106-7

This presentation is part of: Nitrogen in Forest Soils

Soil Nitrogen Dynamics in Intensively Managed, Mid-Rotation Loblolly Pine Plantations in Louisiana.

Michael A. Blazier and D. Andrew Scott.

Nitrogen (N) demand commonly exceeds supply in young loblolly pine plantations. Soon after canopy closure, stand demand reaches a maximum while supply declines due to reduced soil temperatures, water availability, and pedoturbation. Several treatments may be applied to plantations at mid-rotation to syncronize soil supply with stand demand, including thinning the crop trees, applying N fertilizer, and controlling non-crop vegetation. A study was installed on four different site types in Louisiana to determine how thinning, fertilization, weed control, and inherent soil and site factors interact to control soil N dynamics, microbial biomass, and ultimately crop tree uptake. Results from two years of measurements will be discussed.

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