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UVM Extension warns of legacy phosphorus, outlines tile‑drainage research and nutrient management work
Summary
UVM Extension described causes of elevated soil phosphorus in some Vermont fields, ongoing tile‑drainage trials at Discovery Acres, and extension work on nutrient management plans, buffers and practices to limit phosphorus transport to waterways including Saint Albans Bay.
Heather Darby, professor and soil specialist at University of Vermont Extension, told a legislative committee that much of Vermont’s soil phosphorus results from long‑term fertilizer and manure applications and that phosphorus binds strongly to aluminum in many hill soils, reducing plant availability and leading farmers historically to apply more phosphorus.
Darby described research at a commercial site called Discovery Acres in St. Albans Bay on Jewett Brook (within a watershed identified as impaired).…
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