Effects of defoliation on dryland wheat production in central Queensland
1993
Asghar, M. | Ingram, B.F. (Queensland Dept. of Primary Industries, Biloela (Australia))
The effect of insect defoliation on grain yield, N content, and gross value of dryland wheat was simulated by removing blades from the flag leaf, top 2 leaves (flag leaf plus the one below it), and all leaves, 100 days after planting the crop. When blades were removed from the top 2 leaves and all leaves, respectively, significant reductions of 13.5 and 17.3 percent in grain yield, 9.2 and 11.9 percent in head weight, and 7.6 and 13.2 percent in 1000-grain weight were recorded. Defoliation did not significantly decrease grain number per sq m. When blades were removed from the flag leaf, top 2 leaves, and all leaves, respectively, significant reductions of 9.5, 17.3, and 14.0 percent in grain N concentration, and 14.2, 28.4, and 28.8 percent in grain N yield occurred. Gross values of the yields from different treatments were ranked control greater than flag leaf blade removed greater than top 2 leaves removed, equal to all leaves removed.
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