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This article in SSSAJ

  1. Vol. 35 No. 6, p. 1002-1004
    Received: Apr 29, 1971
    Accepted: July 25, 1971

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Ammonium Pyrophosphate and Ammonium Orthophosphate as Phosphorus Sources: Effects of Soil Temperature, Placement, and Incubation1

  1. O. P. Engelstad and
  2. S. E. Allen2



Triammonium pyrophosphate [(NH4)3HP2O7] was found to be less effective than monoammonium orthophosphate [NH4H2PO4] when both were freshly added as sources of P for corn (Zea mays L.) grown in cool soil (16C). No difference in effectiveness was found between these sources when freshly applied to warm soil (24C). Incubation prior to planting reduced the effectiveness of both sources, particularly when the soil was warm during the incubation period.

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