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Agronomic Effectiveness of Bayovar Phosphate Rock in Soil with Induced Phosphorus Retention
Author(s) -
Hammond L. L.,
Chien S. H.,
Easterwood G. W.
Publication year - 1986
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1986.03615995005000060044x
Subject(s) - soil water , loam , phosphorite , phosphorus , water retention , chemistry , fertilizer , phosphate , cation exchange capacity , agronomy , nutrient , ultisol , zoology , environmental science , soil science , biology , organic chemistry
Abstract 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.