Bermudagrass Cultivar Response to Nitrogen, Phosphorus, and Potassium. (5304)
Authors:
J.M. Cofield - Auburn University C.C. Mitchell* - Auburn University D.M. Ball - Auburn University
L.A. Kriese-Anderson - Auburn University
Abstract:
Two hybrid bermudgrass cultivars [Cynodon dactylon (L). Pers], 'Russell' (R) and 'Tifton 44' (T) were grown for 5 yr on established long-term soil fertility experiments at two locations in North Alabama, a Hartsells fine sandy loam (fine-loamy, siliceous, thermic Typic Hapludults) and a Savannah fine sandy loam (fine-loamy, siliceous, thermic Typic Fragiudults). The purpose of these experiments was to determine the effect of soil P and K levels and N fertilization on yields of these two cultivars. The experiments were randomized complete blocks with four replications. Cultivars were split plots.
Nitrogen was applied from 0 to 168 kg/ha in the spring and after each cutting, holding applied P and K levels constant. Rates of P and K ranged from 0 to 100 kg P/ha and 0 to 93 kg K/ha with N constant at 112 kg N/ha. Response of both cultivars to N can be described with a quadratic function regardless of soil type. Yield of both cultivars peaked at or below 112 kg N/ha and decreased with N over 112 kg/ha.
Both cultivars produced maximum dry matter yield with long-term P applications of 18 kg P/ha and long-term K applications of 93 kg K/ha.
Speaker Information: Charles Mitchell, Auburn University, Dep. Agronomy & Soils 201 Funchess Hall, Auburn University, AL 36849; Phone: 334-844-5489; E-mail: [email protected]
Session Information: Monday, November 1, 2004, 10:00 AM-12:00 PM Presentation Start: 10:00 AM (Poster Board Number: 2248)
Keywords: soil fertility; bermudagrass; soil test calibration; nitrogen rates
