Abstract
Abstract Experiments were done to define the relationships between tissue N fractions and the growth rate of wheat (Triticum aestivum L.) seedlings. The crop was grown in the greenhouse at two levels of incident radiation in soils supplying different levels of nutrients, its growth rate measured and its tissues analyzed for different N fractions. Soluble reduced N (SRN) expressed as a fraction of “protein N”; was found to usefully predict relative growth rate (RGR). Maximum growth was associated with “SRN / protein N”; values approximating 12%, smaller values corresponded to reduced growth from N stress and low levels of light, while values above 18% were characteristic of plants in which amino compounds had accumulated due to deficiencies of nutrients other than N and to toxic factors.
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