Water Content
2013; Linguagem: Inglês
10.2134/agronmonogr9.1.c7
ISSN2156-3276
Autores ResumoChapter 7 Water Content Walter H. Gardner, Walter H. Gardner Washington State University, Pullman, WashingtonSearch for more papers by this author Walter H. Gardner, Walter H. Gardner Washington State University, Pullman, WashingtonSearch for more papers by this author Book Author(s): First published: 01 January 1965 https://doi.org/10.2134/agronmonogr9.1.c7Citations: 22Book Series:Agronomy Monographs AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary Direct or indirect measures of soil water content are needed in practically every type of soil study. In the field, knowledge of the water available for plant growth requires a direct measure of water content or a measure of some index of water content. Computations of water content on a volume basis require a correct measure of the bulk density. If the density of the soil less its water content is constant, then changes in the attenuation represent changes in water content. Considering the variability of soil, even in an area as small as a few square feet, some error is nearly always involved. Water content measurements by gravimetric methods involve weighing the wet sample, removing the water, and reweighing the sample to determine the amount of water removed. Electrical and thermal conductivity and electrical capacitance of porous materials vary with water content. 7–4 Literature Cited Anderson, A. K. C., and Edlefsen, N. E. 1942. Electrical capacity of the 2-cleclrode plaster of Paris block as an indicator of soil moisture content. Soil Sci. 54: 35–46. CASWeb of Science®Google Scholar Ashton, F. M. 1956. Effects of a series of cycles of alternating low and high soil water contents on the rate of apparent photosynthesis in sugar cane. 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