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

<strong>height</strong> genotJpes to high nitrogen leveLs.
Nitroåen Reslgnse
In general, at all sites and for all traits studied,
the si"gnifieant response to applied N was rinited to the
first increnent <strong>of</strong> N applied except where growing condítions
were below average. This occurred at Carnan. There, signifi-
cant response to N continued with the higher increnents. At
afl sites response continued as applied N increased up to
the third and fourth N level, but the responses were not
a lways signifieant.
Plant <strong>height</strong>, yield, spikes per unit area, kernels per
spike, lodgingn days in post-anthesis, per.cent barrey nitro-
gen, alpha-amylase levels, saccharifying activity and l-eveLs
<strong>of</strong> sol"uble amino-nítrogen al1 responded positively to added
nitrogen.
KerneÌ and test weights tended to respond positively to
the fírst N increnent, but then showed negative responses to
increased levels <strong>of</strong> N.
Days to maturity tended to increase or not to respond
to nitrogen, while the response <strong>of</strong> days to heading depended
on the environmental conditio.rts at each 1ocation.
the results indicated that, for the
competitive ín terns <strong>of</strong> yÍeLd, increased
semi-dwarfs to be
1evels <strong>of</strong> management
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