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Evaluation of physiological parameters for the prediction of seed yield and quality for soybean ( Glycine max ) plants grown in the presence of weed competition

2011; Taylor & Francis; Volume: 145; Issue: 1 Linguagem: Inglês

10.1080/11263504.2010.514129

1724-5575

Katherine D. L. Millar, Stephen D. Ebbs, David J. Gibson, Andrew J. Wood, Bryan G. Young,

Cassava research and cyanide

Abstract Abstract Weed competition is detrimental to crops. A 2-year field study was conducted with soybean cultivars (Glycine max L. Merr.) grown in the presence of mixed weed competition to determine whether foliar parameters and micronutrient concentrations served as predictors of seed yield and quality. Relative water content, chlorophyll fluorescence, and foliar trigonelline, Mn, Fe, Cu, and Zn, were collected from leaves. Trigonelline differed between growth stages in the first year but showed a three-way interaction between cultivar, weed competition, and growth stage in the second year. Fluorescence and Fe differed significantly only between growth stages within years. Two- and three-way interactions between treatment variables were observed for Mn, Zn, and Cu in at least 1 of the 2 years. Stepwise multiple regressions produced 17 significant models that illustrated the degree to which the parameters explained previously observed variation in seed yield, oil, or protein. Foliar trigonelline, foliar RWC, chlorophyll fluorescence and foliar Fe emerged in several models for seed quality. Cultivar-specific trends produced high variability in the data and low R 2 for several models, demonstrating the need to develop models on a cultivar-by-cultivar basis until more comprehensive data on the relationship between these foliar parameters and seed quality can be obtained. Keywords: Seed qualitysoybeanweed competitionyield Acknowledgements This work was supported by the US Department of Agriculture. The authors would like to thank Matthew Millar, Jack Millar, and James Millar for their assistance in the laboratory and the field. Additional informationNotes on contributorsK. D. L. Millar*The first two authors contributed equally in this work.