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

ïn terms <strong>of</strong> the other paraîneters exanined in this
experinent the genotypes responded. in a similar nanner
relative to rne another.
the senrÍ-dwarfs did lack eompetitive abitity particularly
when grown under ad.verse conditions. This led to the con_
clusion that weed control would be even more åmportant when
growíng such types thân when producing taller types.
Changes in <strong>plant</strong> morphology can have large effects on
the optímum <strong>plant</strong> density required to achj.eve maximum
producti.on" To obtain info:.mation on the impact <strong>of</strong> short
straw in this eontext, one serni_dwa¡.f and one tall genotype
were eonpared at several- combinations <strong>of</strong> row spacings and
seeding rates at three locations.
Varying seeding rate and,/or row sp¿çing had littl.e or
no practical effect on <strong>plant</strong> <strong>height</strong>, kernel weight, test
weight and protein content <strong>of</strong> either the tall or the semi-
dwarf genotype.
fncreased seerling rate showed: signifícantly increased.
yield under adverse growing conclitions at Carman, a trend to
the sane with average conditions at Sanford, and no dif_
ferences at Winnipeg und.er near optimal growing eonditions.
Despite the lâck <strong>of</strong> a significant seeding rate by genotype
interaciion, the seni-dwa!.f tended to show greater posítive
response to seeding rate than the tall.
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