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High Cesium Uptake in Wheat Seedlings Cultured with Ammonium¹

Department of Soil Science, North Carolina State of the University of North Carolina, Raleigh, N.C.

ABSTRACT

Wheat seedlings grown exclusively on NH₄-N, relative to those grown exclusively on NO₃-N or without N, consistently demonstrated a markedly high capacity for subsequent Cs absorption from solutions labelled with Cs¹³⁷. In addition, previous nitrogen nutrition greatly influenced the relative distribution of absorbed Cs, with percentage transport of Cs to tops being greatest in seedlings cultured with NO₃. The results could not be explained on the basis of either K content or respiratory substrate levels prior to the uptake periods.

Contribution from the Soil Science Department, North Carolina Agr. Exp. Sta., Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 1828 of the Journal Series. This work was supported by the Atomic Energy Commission, Grant No. AT-(40-1)-2410.

Received for publication July 7, 1964. Accepted for publication December 1, 1964.