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Performance
in Nebraska
In
early trials in Nebraska, just the two Colorado strains, #3 and
#8, were tested. However, in the Nebraska trials of 1999, 2000 and
2001, the two Colorado strains were tested along side the five Texas
strains -- #102, #112, #223, #278, and #296. These trials were conducted
at three locations in the State -- O’Neill in the north east, Imperial
in the southwest and Scottsbluff in the Panhandle. Nitrogen fertilization
was above recommendation for Russet Norkotah at O’Neill (Table
2)
while, at Imperial and Scottsbluff, it was at or slightly below
recommendation. The highest yields were consistently obtained from
O’Neill and the lowest at Scottsbluff (Table
2).
Percent of total that are US grade A was at Scottsbluff which also
had the greatest percent of mis-shaped tubers. Specific gravity
was highest at O’Neill and Scottsbluff.
Maturity
observations of these strains at Scottsbluff over the three years
indicate that CO #3 has the longest maturity, about two weeks later
than the standard. The next longest maturity was shown by TX #112.
With about a week longer maturity than the standard are CO #8 and
TX #223. The strains TX #102, TX #278 and TX #296 have about a three-day
longer maturation.
The
yields of tubers greater than 1.88 inches are summarized according
to location averaged over three years in Table 3. All strains except
TX #102 yielded significantly greater than the standard and were
not significantly different from each other (Figure
3).
When noting the sites when a strain yields significantly more
than the standard, one finds that only TX #278 consistently did
so at all three sites averaged over the three years. The two Colorado
strains and TX #223 yielded significantly more at two of the three
sites.
Figures
4, 5 and 6
show the percent total yield of tubers > 1.88 inch, percent of
tubers that are mis-shaped, and the specific gravities of the strains,
respectively, averaged over three sites and three years, nine site-years.
With the exception of TX #223, all the strains produced a higher
percentage of tubers greater than 1.88 inch (Fig.
4).
Significantly higher percentage of mis-shaped tubers was obtained
with CO #3, TX #223 and TX #296 (Fig.
5).
CO #3 and TX #296 had a greater specific gravity than the standard
(Fig.
6).
Overall,
TX #278 seems to show the best performance of the strains so far
in Nebraska but most of them perform similarly. TX #102 does not
show promise. The tendency to mis-shape of CO #3, TX #223 and TX
#296 is a caution.
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to Figures and Tables 2
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