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The activity of an equilibrium mixture of the soil, 405 days after the blast, was due mainly to ruthenium-106, rhodium-106, cerium-144, and praseodymium-144. ^•Unpublished results, Soil and Water Conservation Research Division, Agricultural Research Service, U
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. Various exchange equations have been suggested, but none appears universally applicable.
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From page 8... ...
Soil culture experiments, such as those conducted with the Neubauer technique, have been used to evaluate the amount of applied fertilizer that is available for plant uptake. Neutral normal salt solutions are often used to extract the exchangeable cations, which are considered to constitute the major source of the available quantities of many nutrients.
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