Abstract
The effects of NO-3 and NH+4 nutrition on hydroponically grown wheat (Triticum aestivum L.) and maize (Zea mays L.) were assessed from measurements of growth, gas exchange and xylem sap nitrogen contents. Biomass accumulation and shoot moisture contents of wheat and maize were lower with NH+4 than with NO-3 nutrition. The shoot:root ratios of wheat plants were increased with NH+4 compared to NO-3 nutrition, while those of maize were unaffected by the nitrogen source. Differences between NO-3 and NH+4-fed plant biomasses were apparent soon after introduction of the nitrogen into the root medium of both wheat and maize, and these differences were compounded during growth.

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