ORGANISATION · US · NAICS 541715 Research and development in the physical, engineering, and life sciences
Illinois State Water Survey
warm.isws.illinois.edu/warm/soil · 1 documented exposure in the atlas.
Illinois fall anhydrous ammonia: a warm, late-drying fall with barge receipts in their usual range, autumn 2026
Adjacent · Operational, local · evidenced · Drought, 2026-10-29
“4-inch bare soil temperatures across Illinois, courtesy of the Illinois State Water Survey.” — source, 2026-11-04
The retailers' association publishes the Water Survey's daily 4-inch soil temperatures as the gauge for the 50 °F rule. Inferred: its network readings decide, in practice, when Illinois applicators start fall ammonia. The Survey's own data terms were not read, and its readings are not carried as a series here.
Series concerned: il-tavg-f il-topsoil-short-vshort-pct · read the edition →
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