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Soil Science Society of America Journal Abstract -

Achieving Desired Moisture Conditions in Potentially Mineralizable Nitrogen Incubation Studies1


This article in SSSAJ

  1. Vol. 50 No. 5, p. 1370-1373
    Received: June 20, 1985

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  1. M. A. Lueking and
  2. J. S. Schepers2



A technique was developed to determine soil-to-sand mixing ratios to achieve desired soil moisture conditions during incubation in potentially mineralizable N studies. Five soils were selected to represent a range of soil textures. Segmented plastic leaching tubes were used to determine gravimetric water content, bulk density, and percent water-filled pore space (WFP) for two portions of soils used within the incubation tubes. Vacuum leaching resulted in greater water content of soil near the bottom of the incubation tubes compared to the top of the tubes. The proportion of soil-to-sand used in the incubation tubes, which was necessary to attain a given WFP status, was different for each soil type and was a function of original sand and organic C contents. The technique is an inexpensive and time-efficient means to standardize and document soil moisture conditions within incubation tubes used to determine potentially mineralizable N.

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