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CHANGES IN THE CHEMICAL NATURE OF SOIL ORGANIC PHOSPHATE DURING PEDOGENESIS
Author(s) -
BAKER R. T.
Publication year - 1976
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.1365-2389.1976.tb02020.x
Subject(s) - pedogenesis , citric acid , chemistry , phosphate , soil water , organic matter , environmental chemistry , organic acid , soil organic matter , zoology , humic acid , soil science , geology , biochemistry , organic chemistry , biology , fertilizer
Summary In two chronosequences of soils, total organic phosphate (P 0 ) accumulated rapidly during the first 50 years of soil development, when organic matter increased and pH decreased. The rate of P 0 accumulation then declined with age of soil until a ‘steady state’ was reached. The amounts of phospholipid, inositol phosphates and humic acid—P 0 followed the same trends as the total P 0 . Parent materials and very young soils contained largely citric acid‐soluble P 0 , but after less than 50 years, surface horizons accumulated sufficient organic matter to complex a considerable proportion of the P 0 . An upper limit of 20–5 per cent citric acid‐soluble P 0 and 70–80 per cent NaOH‐soluble P 0 was attained within 50 years of soil formation in the surface layers, and this slowly extended down the profile so that, after 10000 years, the soil had 20 per cent citric acid soluble‐P 0 and 70 per cent NaOH‐soluble P 0 to a depth of 1 m.