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Effect of Intensity and Timing of Defoliation on Growth, Yield Components and Grain Yield in Maize

  • N'Guettia R. Yao (a1), Kabrah Yeboua (a1) and Angbonou Kafrouma (a1)

Summary

Early season defoliation of maize significantly reduced plant height and leaf area index but leaf number and leaf emergence rate were not affected. Ear development was significantly affected by both early and late season defoliation although tassel development was barely influenced. Silk growth was the phase of ear development most sensitive to defoliation. Early season defoliation significantly reduced all yield components, leading to yield losses ranging from 54 to 100%. The position of the leaves which were removed had an important effect on the final grain yield. Harvest index was affected by both the intensity and timing of defoliation.

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Croockstom, R. K. and Hicks, D. R. (1988). Effect of early defoliation on maize growth and yield: an eleven-year perspective. Crop Science 28:371373.
Gay, J. P. & Bloc, D. (1983). Détermination des composantes en grain. In Physiologie du Maïs, 180190 (Ed. Gallais, A.). Paris: INRA.
Johnson, R. R. (1978). Growth and yield of maize as affected by early-season defoliation. Agronomy Journal 70:995998.
Prioul, J. L. (1983). Transport et distribution des assimilats chez le maïs: mécanisme et rôle des facteurs externes. In Physiologie du Maïs, 303315 (Ed. Gallais, A.). Paris: INRA.
Vasilas, B. L. & Seif, R. D. (1985). Defoliation effects of two corn inbreds and their single-cross hybrid. Agronomy Journal 77:816820.
Yao, N. R. (1980). Vegetative and reproductive development of corn (Zea mays L.) at four spring planting dates. MSc Thesis, The Pennsylvania State University, USA.

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Effect of Intensity and Timing of Defoliation on Growth, Yield Components and Grain Yield in Maize

  • N'Guettia R. Yao (a1), Kabrah Yeboua (a1) and Angbonou Kafrouma (a1)

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