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This article in AJ

  1. Vol. 81 No. 1, p. 53-57
     
    Received: Mar 16, 1987
    Published: Jan, 1989


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doi:10.2134/agronj1989.00021962008100010009x

Bahiagrass Response to Sulfur on an Aeric Haplaquod

  1. C. C. Mitchell and
  2. W. G. Blue 
  1. D ep. Agronomy & Soils, Auburn Univ., Auburn, AL 36849
    D ep. of Soil Science, Univ. of Florida, Gainesville, FL 32611.

Abstract

Abstract

Sulfur fertilization of bahiagrass (Paspalum notatum Flugge ‘Pensacola’) has not been a common practice on northern Florida Spodosols. A 6-yr study was begun in 1978 on an established sward of bahiagrass on Myakka fine sand (sandy, siliceous, hyperthermic Aeric Haplaquod) to determine if an S response could be obtained by intensive management of bahiagass and to evaluate N and S rates for this forage crop. Herbage yield, N and S uptake, the stolon-root mass, and soil S were measured and evaluated at two rates of N fertilization (200 and 400 kg ha−1) and four rates of S fertilization (0, 10, 20, and 40 kg ha−1) as gypsum (CaSO4·2H2O). Splitting S into four applications had no effect on yield, S uptake, or N uptake over a single annual application. At the low N rate, a dry matter yield response did not occur until the fourth year of the study, with maximum yields thereafter predicted at an average annual S application between 27 and 33 kg ha−1. At the high N rate, a dry matter yield response occurred the second year with 10 kg S ha−1 applied, and by the fifth and sixth years, maximum dry matter herbage yield was predicted at an annual S application between 40 and 51 kg ha−1. The stolon-root system accumulated N and S, but S treatments had no effect on extractable or total soil S. Sulfur removed in the herbage exceeded that applied at all but the highest S rate. Sulfur fertilization also enhanced N recovery. A critical S concentration of 1.61 g kg−1 was identified for bahiagrass herbage.

Florida Agric. Exp. Stn. Journal Series no. 7654.

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