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

yield was essentially the sane. îhís resul-t is partic ularJ"y
noteworthy in view <strong>of</strong> the fact that C_?O_j was earlier naturing
on a mean basis, a character normally associated with
lower yield.
Phenotypic Correlations
Due to the sample sÍzes ínvol_ved, the absolute values
<strong>of</strong> correlations required to be significant were srnal_l. The
values required to be significantl_y different from zero
ranged from 0.1J0 to 0.104 and from 0.I?1 to O,]¡93 at t]ne
five and one percent probability levels respeetively. A1-
though signifieant, such relatively snarl correlations are
<strong>of</strong> ]ittle dj"rect importance to a breeder. Even with r = 0.50r
the coeffícient <strong>of</strong> determination (r2) is only 0.2J, indic_
ating that twenty-five percent <strong>of</strong> the variation in the
characters in question j-s coneonitant. on the other hand,
discussion <strong>of</strong> the inter-relationships expressed by these
correlations ís valuable Ín ldentåfying the intricacy and
background <strong>of</strong> character associations in regard to the aelec_
tion <strong>of</strong> improved and ad.apted short-strawed barley, as well
as the selection <strong>of</strong> inproved taller genotypes frorn crosses
involving short-strawed types as a parent.
The following rs a discussion <strong>of</strong> some <strong>of</strong> the character
relationshlps which were reveaLed in the present study.
Plant heilght. îhe positÍve assocr.ations <strong>of</strong> <strong>height</strong> with
yie1d, kernel weight, test weight, plumpness and dâys in
post-anthesis are not encouraging. However, although
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