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

majority <strong>of</strong> studies have reported that yield increases were
due primarily to increased number <strong>of</strong> spikes per unit area
accompanied by either no change or a decrease in one or
both <strong>of</strong> the other yield components. Such was the case
reported by Guitard et a1" (1961) i-n wheat, oats and barley.
Reported results <strong>of</strong> ïloodward (f966) and Dubetz and Bole
(1973) in wheat¡ Foth g! aL (L964) in oats; and Kirby
(1968), Willey and Holliday (19?1), and Gardener and
Rathjen Ã9? 5) in barley are in generaÌ agreement with the
findings <strong>of</strong> Guitard.
Other important agronomic eharacter associations in
barley have been reported in the literature. lisi and Lambert
(f954) reported a negative correlation between yield and
number <strong>of</strong> days to heading, while Rutger et aI. (196?)
reported no significant relationship. Fiuzat and Atkins
(fgfi) reported a negative association <strong>of</strong> yield and maturity
in one <strong>of</strong> two barley crossesr
Yiel-d was reported to be positively correl-ated wÍth
percent plumpness and test weight in barley by Rutger et al-.
(L96?) and Nasr et al. (1973), although the latter found no
relationship in some crosses investigated. DenHartog and
lanbert (]-953) also reported positive yield-test weight
correlations in barley.
Yield-quality factor correLations in barfey have also
been reported. Yield and grain protein have been reported
as negatívely related (DenHartog and Iambert, 1953; Hsi and
T,ambert, 1954; Johnston and Aksel, 1964¡ Hayter and Riggs,
L9