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

îhe effects <strong>of</strong> N on naturity and hence post_anthesis
were the resuLts <strong>of</strong> the growth promoting effeets <strong>of</strong> the
applied N. Genotypic differences were notabr.e only in that
those genotypes with the shorter post_anthesis period.s,
namely c703011 and c?ojojz, were also those with the rowest
kernel welghts. The F x G interactÍons in l9Z5 indieated
that given adequate N aL1 the genotypes studied. had nearly
equal post-anthesis periods.
Quality Paraneters
As was the case in the report <strong>of</strong> Reisenaur and Dickson
Qsao) higher N tevers significantly increased the revers <strong>of</strong>
n1-trogen, saccharlfying activity, and soluble amino_nitrogen
<strong>of</strong> the grain. Â simllar, though non-significant, trend
existed for levels <strong>of</strong> alpha-anylase.
The genotypes had significantly dlfferent grain nitrogen
leveLs at afl sÍtes, though the differences were quite small.
The evidence frorn Carnan, 1926, further suggested that when
N was abundant these differences were yet s¡naller.
The variable results for each genotlæe across locations
suggested that aLpha-amyrase Levels are subject to ¡nodlficatíon
by the envi.ronment and that genotypes nay differ in the
degree <strong>of</strong> environnental reaction. îhis may be <strong>of</strong> importance
in the interpretation <strong>of</strong> alpha-amylase tests when seleeting
for nalting quality.
À11 genotypes, except Mínn64-62, responded to each
increment <strong>of</strong> N for saccharifyi.ng activíty. Minn64_62 ¡ad
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