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TURFGRASS SCIENCE

Leaching of Mineral and Organic Nitrogen from Putting Green Profiles Supporting Various Turfgrasses

^a Dep. of Crop and Soil Sciences, Washington State Univ., Pullman, WA 99164-6420
^b Agriculture and Agri-Food Canada, Crops and Soils Research and Development Centre, 2560 Hochelaga Blvd., Quebec, QC, Canada G1V 2J3
^c Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1
^d Royal Canadian Golf Assoc., Golf House, 1333 Dorval Dr., Oakville, ON, Canada L6M 4X7

^* Corresponding author (chantignym{at}agr.gc.ca).

Nitrate (NO₃^–) leached from golf greens has the potential to impair water quality. Dissolved organic N (DON) is also increasingly recognized as a form leached from fertilized soils. A controlled experiment was conducted to determine (i) the significance of DON in total N leaching losses under simulated golf-green profiles and (ii) the short-term contribution of fertilizer to leaching of inorganic and organic N forms. Various turfgrasses were grown in lysimeter columns designed to simulate a golf-green profile. Fertilizer was applied at 25 kg N ha^–1 every 14 d for 55 d, and the last application was labeled with ¹⁵N. Leachates were analyzed for NO₃^–-N, NH₄⁺-N, and DON. The ¹⁵N recovery was assessed in plant, soil, and leachates. In the presence of plants, 10 to 70% (average 40%) of total N leached was accounted for by DON. Application of ¹⁵N revealed that one-half to two-thirds of NO₃^–-N leached in the following 14 d was derived from the fertilizer, whereas the majority of leached DON was derived from soil residual N. Nevertheless, DO¹⁵N was present in most leachate samples collected for 14 d after fertilizer application, indicating that only a few days were required to convert mineral fertilizer to leachable organic forms. We conclude that DON may be a significant component of total N leaching losses from putting greens and would account for part of the N losses traditionally attributed to volatilization and denitrification.

Abbreviations: DON, dissolved organic N • PAR, photosynthetically active radiation