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Abstract

 

This article in SSSAJ

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


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doi:10.2136/sssaj1971.03615995003500060040x

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

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

Abstract

Abstract

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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