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Phosphate Fractions in Calcareous Soils as Altered by Time and Amounts of Added Phosphate
Author(s) -
Hooker M. L.,
Peterson G. A.,
Sander D. H.,
Daigger L. A.
Publication year - 1980
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/sssaj1980.03615995004400020014x
Subject(s) - calcareous , soil water , calcareous soils , phosphate , carbonate , chemistry , calcium carbonate , environmental chemistry , alkali soil , mineralogy , water soluble , phosphorite , soil test , soil science , geology , botany , biology , organic chemistry
Tie‐up of water‐soluble P is very rapid in calcareous soils. To determine the residual effect of high rates of applied P several experiments were established on soils ranging from 0.1 to 16.5% calcium carbonate equivalents (CCE). At each location an experiment was established with four rates of P (25, 50, 100, and 500 kg/ha). The soils were sampled annually for periods of up to 5 years. These soil samples were fractionated to determine the concentration of P in the various inorganic P fractions, using the techniques of Syers et al. (1972), as affected by rate of P application and time after application. Over time there was a decrease in the more soluble, plant‐available fractions indicating a shift of P from extractable to nonextractable forms. Also the various P fractions were correlated with two of the more commonly used soil methods, Bray and Kurtz no. 1 and the Olsen NaHCO 3 . As the CCE of the soils increased the correlation of the Bray and Kurtz no. 1 method with the fractions considered most available to plants decreased while the correlation of the Olsen method remained high.