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Potassium Release from Sand, Silt, and Clay Soil Separates
Author(s) -
Munn D. A.,
Wilding L. P.,
McLean E. O.
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/sssaj1976.03615995004000030018x
Subject(s) - silt , soil water , soil science , clay minerals , dispersion (optics) , potassium , mineralogy , particle size distribution , particle size , clay soil , particle (ecology) , geology , chemistry , geomorphology , paleontology , physics , oceanography , organic chemistry , optics
Four Ohio soils of divergent mineralogy were fractionated into sand, silt, and clay‐sized separates after dispersion with an ultrasonic probe. Samples were extracted for 10 days with 0.01 M CaCl 2 with the solution being changed each day. There was a wide range in daily and cumulative K release among the four soils for the same particle size and for different particle sizes within the same soil. When weighted according to particle size distribution of the soil, the clay was found to contribute 30–74%; silt 24–56%; and sand 3–21% of the total K released by the sum of the three separates. In all four soils, the clay separate released the most K per unit weight. The apparent rate constants for K release from the sand and clay separates were similar and renerally higher than that for the silt separates.