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

Sanford â.nd Carnan, 1926, Since N had no effect at these
locations, these dlfferences were genotypic.
Significant F x G interaction occ.ürred at both i-975
sites. [he interaction at Carman, 1925 (fable JO) rvas due
to C7030tl and Minn 64-62 shov¡ing sign.ificant positive
response to applied N, while the renaining genotype s did
not. Àt Portage, L97 5 (fabl.e 31) tfre F x G interaction
occurred as CIA2O24 showed a negative response to N, while
CTOSOIL showed an initial positive response followed by a
negative response to higher N rates. The other genotypes
exhibíted no significant response.
0vera11, C703011 was the lowest in test weight, while
the other genotypes did not differ consistently over
locations (fa¡fe e9¡.). The smalt error (Table 28), gave
rise to a highly sensitj-ve test for statistical significance.
These sorts <strong>of</strong> differences would not 1ike1y be crítieaL fron
a practical productíon viewpoint.
Days to_Headins" Applied N affected days to heading at both
sites in Ig75 and at Sanford, 19?6 (Iã.bl€ 32). This effect
was due to the fírst N inerement at al.l sites (Table 33);
however, the effect at the 1!/J sites was to cause heading
to be earlj-er, while at Sanford, 1926, heading was del_ayed"
Results similar to the I9?5 data were reported by Stanberry
and lowrey \ryô1).
At all sites, the sernj--dwarfs headed sooner than the
taus (labl-e 3lB) . However, it i s evident (fable 3 jÀ ) thât
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