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This article in AJ

  1. Vol. 79 No. 1, p. 1-4
     
    Received: May 28, 1985
    Published: Jan, 1987


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doi:10.2134/agronj1987.00021962007900010001x

Bahiagrass Response to Lime and Nitrogen under Pines1

  1. I. D. Teare,
  2. D. L. Wright,
  3. R. L. Stanley and
  4. B. T. Kidd2

Abstract

Abstract

The fertilization of slash pine trees (Pinus eliotti Engelm), a practice initiated in the sixties, stimulates bahiagrass (Paspalum notatum Flügge) production, providing under-canopy forage for the beef cattle industry of the Southeast on sandy, acid soils. Little research has been conducted to determine the production potential of limed and N fertilized bahiagrass growing under pine. The objectives of this research were to measure bahiagrass forage production under slash pine, comparing lime (2.24 Mg ha−1) vs. no lime, four N rates (28, 56, 112, 224, kg ha−1), and to observe changes in extractable soil P, K, and pH on a Norfolk sandy loam (fine-loamy, siliceous, thermic Typic Paleudult). During the 4yr period, application of 2.24 Mg ha−1 lime empirically decreased bahiagrass forage yield under pines when averaged across N levels. Liming at 2.24 Mg ha−1 yr−1 for 4 yr did change the soil pH from 5.0 to 6.1. Nitrogen rates did not affect bahiagrass forage production the first year, but without lime, we found a quadratic response to N rates each year thereafter. The highest yields of bahiagrass forage with lime were obtained with 56 kg ha−1 N. Economic analysis shows the greatest net return ($441 over 4 yr) for no lime at 112 kg ha−1 N and with lime ($211) at 56 kg ha−1 N.

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