A kinetic parameter for evaluation of the reactivity of agricultural lime
Titel:
A kinetic parameter for evaluation of the reactivity of agricultural lime
Auteur:
van der Watt, H. v. H. Croft, G. J. B.
Verschenen in:
Communications in soil science and plant analysis
Paginering:
Jaargang 24 (1993) nr. 1-2 pagina's 161-169
Jaar:
1993-01
Inhoud:
The “reactivity”; and dissolution rate of an aglime in soil is not adequately described by chemical analysis involving neutralization/dissolution under harsh conditions. A method related to dissolution rate at ambient soil pH values should provide important information on aglime “reactivity”;. We developed a constant pH titration method, using an automated titration assembly, to achieve this aim. Fifteen aglimes, differing widely in composition and reactivity, were compared by titration at pH 4.0, 5.0 and 5.5 and noting the neutralization rate. The time, in minutes, at which 50% of an aglime's neutralizing ability (HCl-value) had been neutralized, was considered to be a useful kinetic parameter and designated T½. The aglimes tested had widely different T½ values even when the aglimes were comparable with regard to particle size and chemical and physical properties. The T½ values were significantely correlated (negatively) with a quality parameter obtained by an acid resin suspension method.
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