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TECHNICAL REPORTS

Vadose Zone Processes and Chemical Transport

Fall Fertilization Timing Effects on Nitrate Leaching and Turfgrass Color and Growth

Department of Plant Science, Unit 4067, University of Connecticut, 1376 Storrs Road, Storrs, CT 06269-4067

^* Corresponding author (karl.guillard{at}uconn.edu)

Received for publication February 17, 2005. Fall season fertilization is a widely recommended practice for turfgrass. Fertilizer applied in the fall, however, may be subject to substantial leaching losses. A field study was conducted in Connecticut to determine the timing effects of fall fertilization on nitrate N (NO₃–N) leaching, turf color, shoot density, and root mass of a 90% Kentucky bluegrass (Poa pratensis L.), 10% creeping red fescue (Festuca rubra L.) lawn. Treatments consisted of the date of fall fertilization: 15 September, 15 October, 15 November, 15 December, or control which received no fall fertilizer. Percolate water was collected weekly with soil monolith lysimeters. Mean log₁₀ NO₃–N concentrations in percolate were higher for fall fertilized treatments than for the control. Mean NO₃–N mass collected in percolate water was linearly related to the date of fertilizer application, with higher NO₃–N loss for later application dates. Applying fall fertilizer improved turf color and density but there were no differences in color or density among applications made between 15 October and 15 December. These findings suggest that the current recommendation of applying N in mid- to late November in southern New England may not be compatible with water quality goals.

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