Abstract
The base-neutralizing capacity, BMC7 (OH- as meq kg-1 needed to raise soil pH to 7), was determined graphically from curves obtained in KOH titration (at a constant ionic strength of I = 0.1). In 84 soil samples, BMC7 amounted to 0—316 meq kg-1, being highest in the heavy clay soils and lowest in the non-clay soils. In different textural groups, BMC7 seemed most markedly to be dependent on the initial soil pH, followed by organic C or oxalate soluble Al, in the coarser clays also on clay content. The results evidence that in determination of lime requirement, attention should be paid to the capacity of soil acidity. In routine soil testing, detailed lime recommendations for various soil types are needed.
Highlights
Since Kamprath (1970) proposed the exas changeable A 1 a criterion for liming, various lime recommendations have been discussed widely
The material consisted of 15 heavy clay soils (60 % or more clay fraction
The analytical methods and soil characteristics are reported in a previous paper
Summary
Since Kamprath (1970) proposed the exas changeable A 1 a criterion for liming, various lime recommendations have been discussed widely. Mäntylahti and Yläranta (1980) have found this method rather unsatisfactory especially for mineral soils where it overestimates the requirement. In routine soil testing the liming recommendations are based on pH ( „ 20) and NH 4-acetate (pH 4.65) extractable Ca. They proposed a titrimetric method for a more precise determination. The purpose of the present study was to estimate the base-neutralizing capacity of Finnish mineral soils in various textural groups. The soil factors accounting for its variation were investigated statistically
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