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

significantry rerated to several others, ther*selves interrelatedr
but these interrelatåonships were not always
eq uipo 1lent .
As reported by Chandler (fg6g) ín rice, Briggle and
Vogel (1968) ín wheât and Konishi (:.:9?6) in barley, the most
valuable effects <strong>of</strong> <strong>reduced</strong> <strong>plant</strong> <strong>height</strong> have been increased
lodging resistance and improved response to applied nÍtrogen
fertilizer (N). Response to N varies with crop, envir<strong>of</strong>fnent
and genotype, and nay or nay not affect the expression <strong>of</strong>
each <strong>of</strong> several important agronomÍc and quality parameters.
fhe following is a díscussion <strong>of</strong> the results <strong>of</strong> experÍ"ments
condueted to determine the responses <strong>of</strong> seleeted semi-dwarf
and talI barley genotypes to various levels <strong>of</strong> applÍed nit_
rogen under field conditions in Soùth_Central Manitoba.
Plary! Heísht
As applied N increased so did <strong>plant</strong> <strong>height</strong>, pre sumably
because increased nr-trogen gives ríse to increased vegetative
growth. this was the case at atl five sites, although the
increase was not slgnificant at the Carman and portage sites
ín 1976,
The very heavy weed infestation at Carman in I9?5
indirectly gave rise to continued <strong>plant</strong> <strong>height</strong> response
beyond N incrernent one. Carbyne, a wild oat chemical used
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