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This article in SSSAJ

  1. Vol. 48 No. 2, p. 399-401
    Received: May 24, 1983
    Accepted: Nov 15, 1983

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Potassium Chloride for Improved Urea Fertilizer Efficiency1

  1. B. D. Rappaport and
  2. J. H. Axley2



Muriate of potash (KCl), a major source of fertilizer K, can be applied in combination with urea [(NH2)2CO] to reduce ammonia (NH3) volatilization. Addition of KCl in combination with urea to fertilize field crops should not increase fertilizer costs.

Laboratory investigations with a Klej loamy sand (Aquic Quartzipsamments) showed that a combination of 1 part urea with 1 part or greater of KCl (by weight) as a fertilizer solution reduced ammonia losses from 42% to 4.6% or less.

Application of 1 part of KCl to 1 part urea in a liquid fertilizer increased sorghum-sudan grass (Sorghum sudanese L.) hay yields over that of urea alone by 85 g m−2 in field studies on a Galestown sandy loam (Psammentic Hapludults). Also, 0.77 parts of KCl to 1 part of urea was equally beneficial. Yield of field corn (Zea mays) on a Hagerstown silt loam (Typic Hapludalfs) was increased by urea in combination with potassium chloride over urea alone by 113 g m−2.

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