Effect of varied shoot/root ratio on growth of maize (Zea mays) under nitrogen-limited conditions: growth experiment and model calculations

G.R. Findenegg

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

Young maize plants have been grown for two weeks on a perlite/sand mixture under controlled high light conditions at two suboptimal nitrogen levels. The relationships between [1] root dry weight (RDW) and dry weight of the total plants, [2] RDW and total root length (TRL), and [3] TRL and daily N-uptake during the two weeks were different for the two N-levels. In contrast, the relationships between [4] the N-concentrations in shoots (NCS) and in total plants, [5] shoot dry weight and leaf area, and [6] NCS and net assimilation rate (NAR) were similar at both N-levels. Mathematical descriptions of the six experimentally derived relationships were combined in a growth model. Varying relation [1] in the model allowed predictions about the effect of different shoot /root ratio (SRR) on growth. Both experimentally observed SRR-relations were nearly optimal for the respective N-levels. Therefore,the SRR established by the plants was close to the 'functional equilibrium' proposed for root and shoot growth.
Original languageEnglish
Title of host publicationPlant nutrition : physiology and applications : proceedings of the eleventh international plant nutrition colloquium, 30 July - 4 August 1989, Wageningen, The Netherlands
EditorsM.L. van Beusichem
Place of PublicationDordrecht
PublisherKluwer
Pages21-27
ISBN (Print)9780792307402
Publication statusPublished - 1990

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    Findenegg, G. R. (1990). Effect of varied shoot/root ratio on growth of maize (Zea mays) under nitrogen-limited conditions: growth experiment and model calculations. In M. L. van Beusichem (Ed.), Plant nutrition : physiology and applications : proceedings of the eleventh international plant nutrition colloquium, 30 July - 4 August 1989, Wageningen, The Netherlands (pp. 21-27). Dordrecht: Kluwer.