OVERNIGHT HEAT LOSSES FROM THE SOIL IN RELATION TO ITS DENSITY

Soil temperatures were measured by mercury-in-steel recording thermographs buried at depths of 1, 3, and approximately 7 inches in bare soil, loose and dense, among the trees of an orchard. The temperature drops on clear, calm "radiation" nights were recorded, with soil moistures determined on the following mornings, and with soil densities measured before or after the period when the thermographs were in the ground. Thus the overnight losses of sensible heat from the profiles were computed. Soil at a density of 1.20 g/cu emitted 10 to 20 more cal/sq cm than soil at a density of 0.9 g/cu cm. The rate of heat output from the soil in the last quarter of the night was more than half that of the first quarter. While much of the additional heat derived from a denser soil may be dissipated by air currents or balanced out by a reduced dew fall, an output gain of the order measured could easily account for a lesser intensity of frost over a denser soil. /Author/

  • Corporate Authors:

    Department of Scientific and Industrial Research

    Private Bag
    Wellington,   New Zealand 
  • Authors:
    • Gradwell, M W
  • Publication Date: 1963-12

Media Info

  • Features: References; Tables;
  • Pagination: p. 463-473
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00264532
  • Record Type: Publication
  • Source Agency: Meteorological and Geoastrophysical Abstracts
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM