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THE RATE OF IMMOBILIZATION OF APPLIED PHOSPHATE IN RELATION TO SOIL PROPERTIES
Author(s) -
LARSEN S.,
GUNARY D.,
SUTTON C. D.
Publication year - 1965
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1965.tb01427.x
Subject(s) - acre , phosphate , phosphate fertilizer , soil water , fertilizer , chemistry , half life , environmental chemistry , zoology , mineralogy , soil science , environmental science , agronomy , biology , biochemistry , organic chemistry , pharmacokinetics , pharmacology
Summary The fate of superphosphate applied at 500 and 1,000 Ib P 2 O 5 per acre in a field experiment with twenty‐four sites was followed by measuring changes in the L‐value over 5 years. The L‐value decreased exponentially at a rate that was expressed as the time in years for half the applied phosphate to become non‐labile (the half‐life). The two fertilizer rates gave similar values in most of the experiments and half‐life values were satisfactorily measured for nineteen soils; the values ranged from 1 to 56 years. Some relationship between half‐life values and a number of soil properties was sought. The only significant correlation was with the hydrogen‐ion concentration, from which it is suggested that the decrease in labile phosphate could be the result of the formation of a crystalline basic calcium phosphate at a rate that increases with soil pH.