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Presenters say nursery systems have different nitrogen dynamics; panel urged tailored management and monitoring
Summary
Presentations from nursery specialists found most applied nitrogen remains in substrate and little is lost to groundwater in measured plots; presenters urged tailored practices (lined ponds, reuse, flow metering) and cautioned against applying field-crop rules to containerized nursery systems without additional data.
Two experts presented new and summarizing data on nitrogen dynamics in nursery (vivero) production and urged the panel to treat nurseries differently from field crops when developing reporting or limits.
Bruno Pichón described controlled mass-balance experiments on containerized nursery systems: in one study he reported approximately 5% of applied nitrogen recovered in plant tissue, about 56% remained in potting substrate, roughly 6% of the applied nitrogen…
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