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Effects of Plant Parts on the Grain Yield, Kernel Weight, and Plant Height of Wheat and Barley¹

A field study was conducted on dry land to determine the contribution of different plant parts to the kernel development of wheat and barley. Shading of the spike proved to be the most effective treatment in reducing the grain yield and 1000-kernel weight of wheat and barley. The least significant effect was obtained by the removal of the lower leaves. Treatments made 1 week before anthesis caused maximum reductions in grain yield and 1000-kernel weight. Plant height was least affected by shading or removal of the different plant parts.

Clipping full awns at anthesis had the most significant effect on the grain yield and 1000-kernel weight of wheat, reducing the yield 20.8% and the weight 13.4%. This reduction corresponded to the proportion of the awns clipped and the advancement of the stages of growth studied. The plant height was not affected by clipping the awns.

Key Words: photosynthetic ability • clipping of awns • shading of spikes • defoliation

² Assistant Professor of agronomy, graduate student (now at Agricultural Research Station, Dera Israail Khan, West Pakistan), and Professor of agronomy.

Received for publication June 5, 1967.