IMPACT OF P FERTILIZER, LIME, AND GYPSUM APPLICATION ON STARGRASS YIELD AND QUALITY, AND ON SURFACE AND GROUND WATER QUALITY

Martin B. Adjeil, Jack E. Rechcigl and Isabella S. Alcordo

No 256627, 38th Annual Meeting, June 30-July 5, 2002, Trois-Ilets, Martinique from Caribbean Food Crops Society

Abstract: Phosphorus fertilizer did not increase stargrass forage yield nor improved forage crude protein or forage digestibility when applied to an Immokalee fine sand soil (sandy, siliceous, hyperthermic Arenic Alaquod). Although the applied P improved forage tissue P concentration, most cattle producers routinely feed a balanced mineral salt which contains adequate P. Applied P caused a significant build-up of P in the Ap, E, and Bh horizons, increased soluble P concentrations in shallow and deep wells by 400% and 1500%, respectively, and in surface runoff by 50% and increased the potential for non-point source of P pollution. Gypsum was effective in eliminating P leachate from applied P into deep wells but was not beneficial for reducing P in surface runoff. Although promising in reducing total P in surface runoff, the long-term benefit of Ca-lime was not clear due to equilibrium effect.

Keywords: Crop; Production/Industries (search for similar items in EconPapers)
Pages: 10
Date: 2002-06-30
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs02:256627

DOI: 10.22004/ag.econ.256627

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