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Researchers say container nurseries leach less nitrogen than INMP assumptions; recommend BMPs and targeted monitoring
Summary
Presenters from UC Cooperative Extension reported a small, controlled study of container nursery nitrogen balance showing most applied N remained in substrate or was emitted, with only ~3% leaching below the bed; they recommended practical BMPs (lined ponds, capture/repump and reuse) rather than crop-by-crop removal accounting for container systems.
Presentations from two UC Cooperative Extension advisers gave the panel new data and practical recommendations for nursery operations.
Bruno Piton presented a mass-balance study on container-grown Crepe Myrtles that tracked nitrogen inputs (controlled-release fertilizer) and outputs. He reported roughly 5% of applied nitrogen was in plant tissue at sale, 56% remained in substrate, 6% was captured in off-site runoff (potentially reusable), ~30%…
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