Influence of urea and of chlorocholine chloride on accumulation of Cs-137 in spring wheat crops

The influence of leaf feeding with nitrogen in urea solution and applicatio n of chlorocholine chloride (CCC) on the uptake of Cs-137 by spring wheat f rom the investigated soil samples and through leaves was studied in pot exp eriments. Spray application of nitrogenous fertilizer in urea solution with additional use of growth retardant were found to have brought about an inc reased accumulation in the grain of Cs-137 taken up by the plants from the contaminated soil. It was found that 2-4 times more Cs-137 accumulated in w heat grain from leaves contaminated in the flowering stage in comparison wi th that found in the grain of plants contaminated in the propagation stage. The application of leaf feeding with urea and chlorocholine exerted no inf luence on the accumulation of Cs-137 in grain if the plants had been contam inated superficially in their earlier development stages. Contamination wit h Cs-137 sprayed upon the plants after application of chlorocholine chlorid e appeared to pass to the spring wheat crops more readily.