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Soil Science Society of America Journal Abstract -

Efficiency of Phosphorus Utilization by Alfalfa from Manure and Superphosphate1


This article in SSSAJ

  1. Vol. 43 No. 3, p. 523-528
    Received: Nov 28, 1977
    Accepted: Dec 15, 1978

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  1. D. W. Goss and
  2. B. A. Stewart2



Efficiencies of phosphorus utilization by alfalfa (Medicago sativa L.) from feedlot manure and superphosphate were examined in greenhouse and field studies. Alfalfa grown in soil treated with superphosphate removed a higher percentage of the added P than alfalfa grown in soil treated with manure. However, alfalfa grown in manured soil had the higher P utilization efficiency, as measured as yield increase per unit increase in P removed. This was due in part to more luxury consumption of P by the early cuttings on the superphosphate treatment. The P in feedlot manure was released more slowly for plant uptake and the P level remained adequate for a longer period. Apparently, microbial activity is important in the slow release of manure P. This was thought to be due to the increase in microbial activity as a result of the added energy source. Field studies indicated that P from feedlot manure carries over from year to year and becomes available with time.

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