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Rate of uptake of 15N supplied as nitrate, l-alanine, l-tetraalanine or 15N-labelled microbial culture to sterile wheat (Triticum aestivum) plant roots and roots of plants growing in soil. Values are mean ± SEM; n = 3 for sterile plants and n = 4 for plants grown in soil. Values for both plants in sterile culture and plants grown in soil assume uptake over the entire root system.
