Nitrogen Leaching in Bermudagrass Turf: Daily Fertigation vs. Tri-Weekly Conventional Fertilization
- G. O. Snyder,
- E. O. Burt and
- J. M. Davidson
Nitrogen leaching in bermudagrass turf (Cynodon × Magenissii Hurcombe) grown on an irrigated sand soil in southern Florida was measured for two methods of application: (I) daily fertilization through the irrigation system (termed “fertigation”); (ii) N fertilization with water-soluble material at 3-week intervals (termed “conventional”). In both cases N was applied at 5 g/m2/month from ammonium nitrate. The soil (Pompano fs) had a volumetric field capacity of only 0.08 cm3/cm3, which made the soil very conducive to leaching. Nitrate-N observed at a soil depth of 60 cm generally fluctuated more in the conventional treatment, being greater than in the fertigation treatment shortly after the conventional treatment plots were fertilized, but reaching lower levels several weeks after fertilization. As a result of the low field capacity of the soil and the high amounts of irrigation used in this study, from 35 to 55 % of the N applied was lost by leaching, depending on irrigation, rainfall, evapotranspiration, and method of N application. When excessive irrigation water was used, or rainfall occurred shortly after the conventional plots were fertilized, about 50 % more N was leached in the conventionally fertilized plots than in those plots receiving N by fertigation. Excessive irrigation promoted N leaching by either method of N application.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA