Abstract
AbstractAlternate incubations at various pH values and extractions with 0.5 N HCl for a Crosby soil indicated an increase in K release from nonexchangeable forms with increase in pH. Incubations of samples of the same soil with various cations in the exchange complex indicated higher K release from nonexchangeable forms with Ca rather than H as the exchangeable cation. Samples of six soils were extracted with AlCl3 or with HOAc and then incubated in the moist after removal of excess salts and the addition of various quantities of lime. There was about 50% less K release with the AlCl3 treated soils than with the HOAc treated soils. With the AlCl3 soils there was no change in K release with increase in pH. In the HOAc treated soils there was a tendency for K release to increase with increase in pH.
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