Premium
Phosphorus Sorption of Subtropical Acid Soils as Influenced by the Nature of the Cation Suite
Author(s) -
Russell J. S.,
Kamprath E. J.,
Andrew C. S.
Publication year - 1988
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/sssaj1988.03615995005200050038x
Subject(s) - monocalcium phosphate , sorption , soil water , chemistry , phosphorus , phosphate , environmental chemistry , fertilizer , subtropics , saturation (graph theory) , ammonia , adsorption , soil science , environmental science , ecology , mathematics , organic chemistry , combinatorics , fishery , fish <actinopterygii> , fish meal , biology
Previous field studies with pasture on subtropical acid soils in eastern Australia showed a long residual effect of relatively low rates of fertilizer P. Samples of six soils from eastern Australia were collected to determine their P sorption characteristics. Monocalcium phosphate solutions containing 0.005 M CaCl 2 were equilibrated with samples which were untreated, limed or CaCl 2 ‐leached. Measurements were made of the amount of P sorbed and P remaining in solution. The soil chemical properties affecting P sorption, P buffering and amount of P sorbed needed to provide 0.2 µg P mL −1 were determined by multiple regression analysis. Phosphorus sorption and buffer capacity increased with increasing CuCl 2 ‐extractable Al and decreased with increasing exchangeable Na saturation or increased soil solution Na. Amounts of sorbed P needed for 0.2 µg P mL −1 in the soil solution were relatively small for the untreated and limed Natrustalfs and ranged from 13 to 37 mg P kg −1 soil. A given application of P fertilizer will provide a higher soil solution P in subtropical soils which contain appreciable Na, such as Natrustalfs, than those in which Ca is the dominant cation.