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Control of water content in laboratory determination of mineralizable nitrogen in soils

Control of water content in laboratory determination of mineralizable nitrogen in soils

Soil Science Society of America Journal 45(2): 444-446

A simple, convenient method was developed to control precisely moisture content in soil samples during aerobic incubation for determination of mineralizable N. The sample is contained in a polystyrene filter unit with a filter membrane having a bubble point pressure well above the 33 kPa [Pascal] suction tension normally used for equilibration. Equilibration at 7 moisture tensions (5-67 kPa) gave soil water contents that were very similar to those obtained by conventional pressure plate measurements. N mineralization values obtained at different tensions varied as expected, but reproducibility of 3 determinations on 4 chernozemic soils was good at all tensions used.

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Accession: 000848073

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