Plant studies with radioactive sodium
1950
Leonard, C.D. | Toth, S.J.
Radioactive Na22 was introduced into a series of sand and outdoor cylinder cultures to obtain supplementary information on the nutrient value of Na. The most important findings were: The absorption of Na22 was governed by the same factors that determined the uptake of Na. In sand cultures, the absorption of Na22 by plants was affected by the K and Na levels in the substrate. At constant K levels, the absorption of Na22 decreased as the Na level increased. At constant Na levels, the absorption of Na22 increased as the K level decreased. Na22 tended to concentrate in the conducting tissues of plants. This was confirmed both by activity measurements and by radioautographs. The less mature fractions of tomato plants contained the bulk of the absorbed Na22. Between 57 and 91.6% of the absorbed Na22 found to be in the sap of plants. Celery plants absorbed Na22 at a faster rate than tomato plants. Sugar beets, except those that received nitrogen in the form of calcium nitrate, obtained most of their Na22 from a 6-inch soil depth.
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