Effects of reduced plant height on breeding requirements and ...

y some 14.0 pereent.
îhese results suggested then, that the breeder, in
deve]-op5-ng semi-dwarf barleys, must attempt to naintain
kerneL slze and nurnber per spike, but increase the number
<strong>of</strong> spikes per unit area. This happens when the seeding
rate is increased, leading to the genotype whieh can produce
the best spikes wlth adequate kernels havlng the greatest
yield potential. rhe breeder must obtafn an adequate
balance anong the yieJ"d components and at the sane tinne
maximize the yield.
On the other hand, the results <strong>of</strong> this study provided
a warning that under less than ideal cond.itions the ability
to produce nore spikes per unít area nay be disadvantageous"
The other yierd conponents may suffer too much in such srtuations,
Ieading to decreased yields. Furthermore, even if
total yield does not drop, kernel sÍze and weight likely
wilL. This aLone is undesirable from a grain quality standpolnt
in barley.
fest Sleight and percent Barlev Nitrosen
lhese parameters were unaffeeted by altered row spacing
and seedÍng rate' except for sright varíations related to
changes in kernel size. fest weíght decreased and barfey
nltrogen increased as ker:ne 1 welght went down. Minn6þ-62rs
hígher test weight at Winnipeg likely occlrred because this
genotype was later rnaturing, and at that site was able to
complete its growing cycle under the less stressful conditions.
2L8