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

Phenotypicaì.J_y novel gernplasm, like that <strong>of</strong> the seni_
dwarf, may respond differently to varLatíons Ín row spacÍng
and./or seeding rate (Stoskopf , ]96?¡ Briggs, lrg?il. Since
a <strong>plant</strong> breeder want s to test a genotype using procedures
which do not llmit Ltrs performance and mask its true potential,
these interactions are important. They are also in_
r¡aluable in making agronomf.c reconmendatl,ons to the producer
about these novel types so that their potential may be fu1ly
exploited. It was with thege considerations in mind that
thls study <strong>of</strong> selected talL and short genotypes wã.s eonduct_
ed to meaeure the êffect <strong>of</strong> varíous row spac ings and seeding
rates on several agronolnic parameters.
Planrb HeiEht
Since the ÍraÍn purpose <strong>of</strong> deveLoping semi-dwarfs is to
irnprove straw strength, whlch is associated with shorter
straw, knowledge <strong>of</strong> factors influencing the <strong>height</strong> <strong>of</strong> a
seml" -dwarf is desirable. Therefore, the effects <strong>of</strong> various
spacings and seeding rates on <strong>plant</strong> heíght was i.rnportant.
Varying row spaeing and seeding rate did not alter the
<strong>height</strong> relationship between the two genotypes. However, the
dífferent environmental conditions encountered did. read to
variable behaviour. A.t both Sanford and Winnipeg, under good
growing conditj.ons, both genotypes were taller than at Carman,
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