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Preservation Of Soil Samples For Assay Of Urease Activity

M. I. Zantua, J. M. Bremner
Published 1975 · Chemistry

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Abstract Studies with 10 soils selected to obtain a wide range in properties indicated that several drying and storage treatments are satisfactory for preserving soil samples for assay of urease activity. The following treatments of field-moist soils had no effect on the values obtained in assay of urease activity: freeze-drying (−60°C) for 60 h; air-drying (22°C) for 48 h; oven-drying (55°C) for 24 h; storage at 20, 5, −10 or −20°C for times ranging from 1 day to 3 months. No change in urease activity occurred when air-dried soils were stored at 21–23°C for times ranging from 1 week to 1 year.
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