Nitrogen nutrition and growth of the rice plant

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Abstract
The origin of amino-acid nitrogen in developing leaves was investigated by using UN as a tracer. The amino acid nitrogen in free and bound forms consisted of newly-distributed and retranslocated nitrogen. Amounts of glutamic acid, aspartic acid, and alanine were relatively dependent upon the newly-absorbed (distributed) nitrogen and, on the contrary, arginine, lysine, proline, and valine were dependent on the retranslocated nitrogen. Nitrate seemed not to be retranslocated after it was once distributed in a leaf, and some of it was stored in the old leaves in unchanged form.