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This article in SSSAJ

  1. Vol. 44 No. 2, p. 435-437
     
    Received: Sept 7, 1979
    Published: Mar, 1980


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doi:10.2136/sssaj1980.03615995004400020049x

Bicarbonate-Extractable Phosphorus in Fresh and Composted Dairy Manures1

  1. K. Elias-Azar,
  2. A. E. Laag and
  3. P. F. Pratt2

Abstract

Abstract

The availability of the P from manure and from KH2PO4 was estimated by extraction with NaHCO3 following incubation in soils for 15, 30, and 45 days. In two alkaline sandy soils the availability of the P from manures was equal to that from KH2PO4. The availability of manure P relative to P from KH2PO4 increased as the pH increased and as the sand content increased, i.e., as the clay plus silt increased. The relative availability of the manure P increased in some soils as the time of incubation increased.

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