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Agronomy Journal Abstract -

Mineral Concentrations in Forage Sorghum Grown under Two Harvest Management Systems


This article in AJ

  1. Vol. 85 No. 4, p. 826-833
    Received: May 26, 1992

    * Corresponding author(s):
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  1. S. P. Kidambi,
  2. A. G. Matches ,
  3. T. P. Karnezos and
  4. J. W. Keeling
  1. D ep. of Microbiology and Molecular Genetics, Oklahoma State Univ., Stillwater, OK 74078
    D ep. of Agronomy, Horticulture, and Entomology, Texas Tech Univ., Lubbock, TX 79409-2122
    T exas A&M Univ., TAES, Lubbock, TX 79401



Little information is available on the mineral concentrations of forage sorghum [Sorghum bicolor (L.) Moench] leaves and stems. Our objective was to determine whether commercially available forage sorghum could be expected to supply the minimum mineral requirements for beef cattle when harvested as simulated grazing of pastures (SP) or as hay. In 1987 and 1988, 10 forage sorghum entries were grown near Lubbock, TX, in replicated plantings on a fine, mixed thermic Aridic Paleustolls with supplemental furrow irrigation. There were three SP harvests in 1987 and four in 1988. The hay treatments were harvested twice in 1987 and three times in 1988. Entries and managements were different (P ≤ 0.05) in mineral concentrations, as was the management ✕ entry interaction for Mg, K, Na, Cu, and the K/(Ca + Mg) ratio. Generally, for both management systems, leaves had numerically higher concentrations of Ca, Mg, P, and Mn than stems, while the reverse was true for K, Na, and the K/(Ca + Mg) ratio. Copper and Zn concentrations were not consistent for either harvest schedule or leaves and stems. Minerals found most likely to be limiting for beef cattle (Bos taurus) were P and Zn, but P would generally be adequate if cattle had daily access to leafy growth. Calcium tended to be low and the K/(Ca + Mg) ratio high in stems of the hay harvests. The levels of the other minerals appeared to meet the minimum requirements for beef cattle for most of the growing season. Overall, the 10 entries of forage sorghum appeared similar in meeting mineral requirements of beef cattle.

Joint contribution of the College of Agric. Sci. and Texas Agric. Exp. Stn. Published as College of Agricultural Sciences Journal Paper no. T-4-330.

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