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Soil Science Society of America Journal Abstract -

Agronomic Effectiveness of Bayovar Phosphate Rock in Soil with Induced Phosphorus Retention1


This article in SSSAJ

  1. Vol. 50 No. 6, p. 1601-1606
    Received: July 15, 1985

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  1. L. L. Hammond,
  2. S. H. Chien and
  3. G. W. Easterwood2



A greenhouse experiment was conducted with soil from the A horizon of an acid Mountview silt loam (Typic Paleudult) to measure the relative influence of soil P retention capacity on P availability from Bayovar (also known as Sechura) phosphate rock (Peru) with that from triple superphosphate (TSP). The P retention capacity of the soil was adjusted by application of variable quantities of freshly prepared amorphous Fe gel. The P sources were incorporated into the treated soil at rates to supply 0, 150, and 300 mg total P kg−1 soil. Corn (Zea mays L.) was grown as a test crop. The Fe gel treatments significantly increased the P retention capacity of the soil and resulted in significant reductions of both dry matter production and P uptake with both P sources. The effectiveness of the phosphate rock, however, tended to decline to a greater extent than that of TSP with increasing P retention capacity. These results suggest that, contrary to popular opinion, the effectiveness of phosphate rock relative to soluble P fertilizer may be less on soils with high P retention capacity than on soils with the same pH but with lower P retention capacity for short-term crops such as corn.

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