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Phosphorous Sorption and Desorption Characteristics of Soil as Affected by Organic Residues
Author(s) -
Singh B. B.,
Jones J. P.
Publication year - 1976
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/sssaj1976.03615995004000030025x
Subject(s) - sorption , chemistry , desorption , incubation , straw , environmental chemistry , hordeum vulgare , agronomy , medicago sativa , sawdust , phaseolus , zoology , adsorption , poaceae , organic chemistry , biology , inorganic chemistry , biochemistry
The influence of seven organic residues on sorption and desorption of P by a high P‐fixing soil was determined after 30, 75, and 150 days of incubation. After incubating for 30 days, all residues decreased the amount of P sorbed by the soil, resulting in higher equilibrium solution P levels. However, after incubating for either 75 or 150 days, the P content of the organic residues had a marked influence on sorption of added P and desorption of sorbed P. The critical value of P in organic residues which resulted in no tie‐up of soil P was 0.3%. Sawdust, wheat straw, and cornstalks which contained < 0.3% P decreased labile soil P and increased sorption by soil after incubating for 75 or 150 days. Alfalfa ( Medicago sativa ), barley ( Hordeum vulgare ), beans ( Phaseolus vulgaris ), and poultry manure that contained P in excess of 0.3% decreased sorption of P. The results suggest that P fertilizer rates estimated from sorption isotherms may need to be modified following addition of organic residues.