Effects of nitrogen fertilization on nitrate movements under turfgrass1
- P. E. Rieke and
- B. G. Ellis
Several nitrogen treatments were applied to ‘Merion’ Kentucky bluegrass (Poa pratensis L.) on two sites: a fine sandy loam and a heavily irrigated sand. Soil NO3-N content was determined every 2 weeks during the 1970 and 1971 growing seasons at depths of 0 to 15, 15 to 30, 30 to 45, and 45 to 60 cm. On the fine sandy loam site there was some movement of NO3-N downward when 2.9 kg N/100 m2 was applied as NH4NO3 in one application in the spring. However, NO3-N was not increased due to treatment in the 45 to 60-cm depth during either season. Significant leaching occurred on the sandy site from the excessive treatment of 3.9 kg N/100 m2 applied in the spring as NH4NO3. Leaching of NO3-N in the sand soil was markedly reduced when the 3.9 kg/100 m2 treatment was divided into three applications during the season.
Slow-release N carriers (activated sewage sludge, ureaformaldehyde, isobutylidenediurea) seldom resulted in soil NO3-N levels greater than the untreated plot. When reasonable N fertilizer programs are followed on turf there is not a significant potential for NO3-N leaching except on heavily irrigated sands. Careful application of both N and water will reduce leaching of NO3-N on such sites. Additional index words: Nitrogen carriers, Nitrate leaching, Irrigation, Turfgrass quality, Poa pratensis.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1974. . Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA