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

1ow leve1s <strong>of</strong> this paraneter at both sites and díd not
respond to increased N at portage.
Minn64-62 was the only genotype with a nore desirable
level <strong>of</strong> soluble anÍno-nitrogen as compareai to Bonanza.
0n an overall basís, C?03011 aind. CZO3O3Z would appear
to be equaì.ly suited for use in breeding prograns enphasizing
malting qualíty. c?o3o3z may have an âdded advantage, since
at high N levels it showed superiority in alpha_anylase and
saccharifying activity, yet no increase in protein. The
other semi-dwarf, Minn64-62, had serious linitations in
terms <strong>of</strong> malting quality, particularly in its 1ow Ievels <strong>of</strong>
alpha-amylase and saccharifying activity.
0verview
Exarnining this experiment as it was conducted, it would
appear that the most serious stress factor which harnpered
the evaluation <strong>of</strong> the seni-dwarfs studied was weed eompeti._
tion. îhis occurred prirnarily at Carnan, most severely in
1975, The se¡ni-dwarfs appeared to be less cornpetitive and
were more affected by the highty competitive weed.s, particu_
larly wild oats. However, the adclition <strong>of</strong> nitrogen improved
the general growing eonditions and. arleviated much <strong>of</strong> this
problern, so that more meaníngful genotypie performance
comparisons could be nade.
lhe findings diseussed ín txperiment I relative to the
semi-dwarf type probably being most advantageous for growing
conditj.ons conducive to lodging and high yields, comblned
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