Journal
EUROPEAN JOURNAL OF AGRONOMY
Volume 19, Issue 2, Pages 161-171Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1161-0301(02)00022-9
Keywords
leaf loss; dry matter allocation; compensation; model; sink-source relations; yield; sunflower model
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Leaf area loss is a typical damage of fungal and insect attacks or hail. In this work growth responses to defoliation were analysed by removing 50% of leaf area at different phenological stages in sunflower (Helianthus annuus L.). Plants defoliated at head-visible stage showed an increased single leaf area which partly compensated the reduction in light interception during the season, while later treatments, during pre-anthesis and complete anthesis, did not show increased single leaf area but a delayed leaf senescence. A decrease in biomass accumulation was observed particularly in pre-anthesis treated plants. Results were implemented into the crop model OILCROP-SUN 6.0 to assess the impact of compensation on growth and yield. It was concluded that leaf area recovery should be incorporated into the growth models for a reliable simulation of yield after partial defoliation. (C) 2002 Elsevier Science B.V. All rights reserved.
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