Co-Authors:
Cohen, Y., The Volcani Institute of Agricultural Research, Rehovot, Israel
Tadmor, N.H., The Volcani Institute of Agricultural Research, Rehovot, Israel
Abstract:
Seedling root penetration of Agropyrum desertorum, Hordeum bulbosum, Medicago hispida, Oryzopsis holciformis, Oryzopsis miliacea, Phalaris tuberosa and Sorghum cernuum under temperature-controlled greenhouse conditions was measured by radioisotope tracing, using soil columns marked with Na 22, P 32, Co 60, Sr 90 and Cs 137 salts. When plants were grown in a nutrient solution, shoot activity was measurable within hours after radioisotope application. P 32, Co 60, Sr 85 and Cs 137 were non-mobile in the soil profile during the periods of investigation. All elements were taken up rapidly from sand cultures. In a loess soil, Co 60 and Cs 137 were adsorbed by the soil and could not be used for tracing. Application of two layers of one radioisotope at widely differing activities, or two radioisotopes with greatly different half-lives allowed simultaneous determination of two rooting depths. Comparison with root development in untreated control columns showed this tracing technique to be more sensitive than conventional methods, even in small-volume containers. © 1966.
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