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

did not have significantty fewer ker.nels per spike than
Bonanza (fable 194.), but did have nore spikes per unit
area (fabte 1?). At this site Minn 64-62 cíð. show yield
superiority over Bonanza, though not by a significant
margín (îable 14).
2Q0 Kernel Weieht. Kernel weight responses to fertilizer
were signlficant at only three locations, whereas significant
line differences were shown at all locations (TabLe 20, ZI).
the study showed increased kernel weight at the inÍtial
increments <strong>of</strong> N, followed by decreased kernel weight as the
applied N increased. this general reaction has been reported
in barley by Gardener and Rathjen (fg? S) and Reisenauer and
Ðickson (1960).
At Carnan, IplJ, thøre was an íncrease in kernel Ìveight
with N increment one, and. no ehange thereafter. At portage,
L975, the first increment <strong>of</strong> N gave the heaviest kernels,
but in this test there rvas a slgnificant deerease in kernel
weight at the hÍgher N levels. At Sanford 19?6, there was
a progreesive deerease in kernel weight as N was increased
above the ccntrol leve 1.
At all sitesn the talls had signíficantly heavier
kerne'ls than did the semi-dwarts (fabte Zt¡).
Significant F x G interactions were detected at Carman
1975 and Sanford 19?6 (Tabte Zo). fhe lnteraction at Carman,
signifieant response to N whí1e the other genotypes responded
90