Rapid Depletion of Nitrogen Applied to Kentucky Bluegrass Turf
Open Access
- 1 March 1989
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 114 (2) , 229-233
- https://doi.org/10.21273/jashs.114.2.229
Abstract
The depletion of N applied to a moderately N-deficient Kentucky bluegrass (Poa pratensis L.) turf was measured using a soil sampling procedure. Nitrogen as either Ca(NO3)2 or (NH4)2SO4 was applied in solution at 5 g N/m2 and washed into the thatch and soil with an additional 0.3 cm of water. Both N forms were located primarily in the thatch and upper 1 cm of soil. The was present in the soil solution, while the was mainly exchangeable (86%). The concentrations of and in the soil solution were 452 and 56 μg N/ml, respectively, in the upper 1 cm of soil. Depletion of both and from the turf was very rapid, with 70% to 80% of the applied N disappearing during the first 24 hr. Essentially all of the applied N was depleted by 48 hr. Results using (l5NH4)2SO4 indicate that ≈75% of the depletion is attributable to absorption by the turf. Similar results were obtained following fertilization of perennial ryegrass (Lolium perenne L.), tall fescue (Festuca arundinaceae Schreb.), and creeping bentgrass (Agrostis palustris Huds.).Keywords
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