Results and Discussion
Table 1 lists the parentage, percentage
of fiber, cold tolerance ratings, and reactions to smut, rust,
leaf scald, and mosaic diseases for each clone included in these
experiments. Tables 2 through 5 contain the results of the CP
94 series plant-cane experiments, and tables 6 through 9 contain
the results of the CP 93 series plant-cane experiments. Tables
10 through 12 contain the results of the CP 93 series first-ratoon
experiments, and tables 13 and 14 contain the results of the CP
92 series first-ratoon experiments. Tables 15 through 17 contain
the results of the CP 92 series second-ratoon experiments, and
table 18 contains the results of the CP 91 series second-ratoon
experiments. Table 19 lists the dates
that stalks were counted in each experiment.
Plant-Cane Crop, CP 94 Series
When averaged across all seven farms, CP 94-1528 and CP 94-2059
yielded significantly more sugar per hectare (TS/H) than CP 70-1133
and all other new clones except CP 94-1100 (table
5). CP 94-1100 yielded significantly more TS/H than CP 70-1133
and all other new clones except CP 94-1628.
CP 94-1528 also yielded significantly more sugar per metric
ton of cane (KS/T) than CP 70-1133 (table
4). The mean yield of metric tons of cane per hectare (TC/H)
of CP 94-1528 was almost significantly greater than that of CP
70-1133 (table 2). At the Knight, SFCE,
and SFCW locations, CP 94-1528 yielded significantly more TC/H
than CP 70-1133. The stability-safety index for TS/H of CP 94-1528
was less than that of CP 70-1133 (table 5).
This was due to moderate TC/H yields at some locations with organic
soils and near average TC/H and KS/T yields on the sand soil at
Lykes (table 2 and table
4). CP 94-1528 had a low preharvest KS/T yield, almost significantly
lower than that of CP 70-1133 (table 3).
CP 94-2059 had high TC/H yields on organic soils. Its mean
TC/H yield, as well as its TC/H yields at five of the six locations
with organic soils, were significantly greater than the corresponding
TC/H yields of CP 70-1133 (table 2). However,
CP 94-2059 had low yields of KS/T. Its harvest KS/T was significantly
lower than the KS/T yields of five other new clones, and its preharvest
KS/T yield was significantly lower than the KS/T yields of CP
70-1133 and eight other new clones (table
3 and table 4).
CP 94-1100 yielded significantly more KS/T and almost significantly
more TC/H than CP 70-1133 (table 2 and
table 4). CP 94-1100 had above average
yields at most locations with organic soils. However, CP 94-1100
was outstanding on the sand soil at Lykes, where it yielded significantly
more TC/H and TS/H than CP 70-1133 (table
2 and table 5). The KS/T yields of
CP 94-1100 were below average at Lykes, particularly its preharvest
KS/T, which was significantly less than the preharvest KS/T yields
of 8 of the 10 other new clones and CP 70-1133 (table
3 and table 4).
Increases of seed cane of CP 94-1528, CP 94-1100, and CP 94-1340
were begun for potential release (table 1).
The TS/H yields of CP 94-1340 and CP 70-1133 were similar. However,
CP 94-1528 and CP 94-1100 each yielded significantly more TS/H
than CP 94-1340 (table 5). The major yield
attribute of CP 94-1340 was its high preharvest and harvest yields
of KS/T (table 3 and table
4).
CP 94-2059 had good cold tolerance, CP 94-1528 and CP 94-1100
had fair cold tolerance, and CP 94-1340 had poor cold tolerance
(table 1). There are no serious disease
concerns for any of these four new clones. However, CP 94-2059,
CP 94-1528, and CP 94-1100 have low levels of susceptibility to
mosaic. In addition, CP 94-1100 and CP 94-2059 have low susceptibility
to leaf scald; CP 94-1528 has low susceptibility to rust; and
CP 94-2059 has low susceptibility to smut. An important attribute
of CP 94-1340 is that it is resistant to all four diseases listed
in table 1. CP 94-1528 and CP 94-2059
had fiber percentages similar to that of CP 70-1133, whereas CP
94-1100 and CP 94-1340 had a moderately low percentage of fiber.
Plant-Cane Crop, CP 93 Series
Last year's report contained the results from five locations
of the CP 93 series from the plant-cane crop (Glaz
et al. 1999). This year, results are available from five additional
locations (table 6, table
7, table 8, and table
9). No new clone yielded more TS/H than CP 70-1133. However,
CP 93-1634, CP 93-1382, CP 93-1309, and CP 93-1065 had TS/H, TC/H,
and KS/T yields similar to those of CP 70-1133 (table
6, table 8, and table
9). All four new clones except CP 93-1065 were similarly identified
last year in the plant-cane crop (Glaz
et al. 1999). Seed cane of all of these new clones except
CP 93-1065 is being increased for potential commercial release
(table 1).
First-Ratoon Crop, CP 93 Series
No new clone yielded significantly more TS/H than CP 70-1133
(table 12), although CP 93-1634 and CP
93-1596 almost did and had significantly greater TS/H yields than
7 of the 11 new clones (table 12). CP
93-1382 also had high TS/H, significantly greater than the TS/H
yields of 6 new clones.
CP 93-1634 had a high mean TC/H yield, although not significantly
greater than that of CP 70-1133 (table 10).
CP 93-1634 and CP 70-1133 had similar yields of KS/T (table
11). CP 93-1596 yielded significantly more TC/H than CP 70-1133
(table 10), but had a low KS/T yield (table 11). CP 93-1382 did not have significantly
different KS/T or TC/H yields than CP 93-1634 and CP 93-1596.
However, the KS/T yields of CP 93-1382 were somewhat higher and
its TC/H yields were somewhat lower than those of the other two
new clones (table 10 and table
11).
Seed cane of CP 93-1634, CP 93-1309, and CP 93-1382 is being
increased for potential commercial release (table
1). CP 93-1309, CP 93-1382, CP 93-1065, and CP 93-1596 had
fair tolerance to cold temperatures, and CP 93-1634 had poor cold
tolerance. One of the strongest characteristics of CP 93-1382
was its resistance to smut, rust, leaf scald, and mosaic. CP 93-1596's
susceptibility to leaf scald and mosaic is undetermined. CP 93-1634
had low susceptibility to leaf scald and mosaic. CP 93-1309 had
low susceptibility to rust and mosaic. Based on natural infection
observed at Eastgate, CP 93-1065 was too susceptible to leaf scald
for commercial production in Florida. All five of these new CP
93 clones had moderately low fiber percentages. The fiber percentages
of CP 93-1382 and CP 93-1065 were closest to the fiber percentage
of CP 70-1133. From CP 93-1634 to CP 93-1309 to CP 93-1596, the
fiber percentages were progressively lower.
First-Ratoon Crop, CP 92 Series
Last year's report contained the results from the first-ratoon
crop of the CP 92 series from seven locations (Glaz
et al. 1999). This year, results are available from three
additional locations (table 13 and table 14). When averaged across all three
locations, no new clone yielded more TS/H than CP 70-1133 (table 14). CP 92-1666, CP 92-1213, and CP
92-1641 were scheduled to be released for commercial production
in Florida in 1999 (table 1). CP 92-1666
and CP 92-1213 had TS/H, TC/H, and KS/T yields similar to those
of CP 70-1133 (table 13 and table
14). Both new clones had significantly lower TC/H and TS/H
yields than CP 70-1133 on the sand soil at Hilliard (table
14). Conversely, CP 92-1666 yielded significantly more TC/H
and TS/H than CP 70-1133 on the Torry muck at Eastgate (table
14). The mean TS/H yield across all three locations for CP
92-1641 was significantly less than that of CP 70-1133 (table
14). CP 92-1641 had high KS/T yields (table
13), but low TC/H yields (table 14)
at all three locations.
Second-Ratoon Crop, CP 92 Series
When averaged across all seven locations, CP 92-1666 and CP
92-1167 had significantly greater yields of TS/H than CP 70-1133
(table 17). As stated in the previous
section, CP 92-1666 was scheduled for commercial release in 1999
(table 1). The high TS/H yield of CP 92-1666
was due primarily to its high TC/H yield, which was significantly
greater than that of CP 70-1133 and seven other new clones of
the CP 92 series (table 15). The stability-safety
index for TC/H for CP 92-1666 was higher than that of any other
clone. This was due to its consistently high TC/H yields at all
locations except Lykes (table 15). The
mean KS/T yield of CP 92-1666 was low, and almost significantly
lower than that of CP 70-1133 (table 16).
CP 92-1666 yielded similarly at these seven locations in the plant-cane
and first-ratoon crops, with the exception that as first ratoon,
it also yielded well at Lykes (Glaz et al. 1998,
1999).
CP 92-1167 had mean yields similar to those of CP 92-1666;
that is, a high yield of TC/H (table 15)
and a low yield of KS/T (table 16) resulting
in a high TS/H yield (table 17). Although
the KS/T yield of CP 92-1167 was similar to that of CP 92-1666,
it was significantly less than that of CP 70-1133 (table
16). CP 92-1167 also had similar yields at these locations
in the plant-cane and first-ratoon crops (Glaz et al. 1998,
1999).
CP 92-1213 and CP 92-1641 were also scheduled for commercial
release in 1999 (table 1). CP 92-1213
had a mean TS/H yield similar to that of CP 92-1666, but not significantly
greater than that of CP 70-1133 (table 17).
The TC/H yield and KS/T yields were both lower than, but not significantly
different from, those of CP 92-1666 (table
15 and table 16). The TC/H yield of
CP 92-1213 was particularly low on the sand soil at Lykes (table 15). CP 92-1213 also had TC/H, KS/T,
and TS/H yields similar to those of CP 70-1133 in the plant-cane
and first-ratoon crops, with particularly low yields at Lykes
(Glaz et al. 1998, 1999).
CP 92-1641 had a lower, but not significantly different, mean
TS/H yield than CP 70-1133 (table 17).
However, the mean TS/H and TC/H yields of CP 92-1666, CP 92-1167,
CP 92-1213, CP 92-1561, and CP 92-1435 were significantly higher
than those of CP 92-1641 (table 15 and
table 17). The positive characteristic
of CP 92-1641 was its KS/T, the mean yield of which was significantly
greater than the KS/T yields of eight other CP 92 clones (table 16). The mean TS/H yield at these seven
locations for CP 92-1641 was similar to that of CP 92-1666 in
the plant-cane crop (Glaz et al. 1998).
In the first-ratoon crop, the mean TS/H yield of CP 92-1641 was
significantly less than that of CP 92-1666 but still similar to
that of CP 92-1213 (Glaz et al. 1999).
Because of its susceptibility to sugarcane rust, CP 92-1167
is no longer being considered for commercial release (table
1). CP 92-1666, CP 92-1213, and CP 92-1641 all have low susceptibility
to sugarcane rust. CP 92-1666 has an undetermined level of susceptibility
to sugarcane smut, and CP 92-1641 has a low level of susceptibility
to leaf scald. CP 92-1666, CP 92-1213, and CP 92-1641 all have
fiber contents of about 10 percent. CP 92-1666 and CP 92-1213
have fair tolerance to cold temperatures, and CP 92-1641 has good
cold tolerance.
Second-Ratoon Crop, CP 91 Series
Last year’s report described the yield results of the
CP 91 series clones at seven locations in the second-ratoon crop
(Glaz et al. 1999). This year, these
clones were tested at Eastgate and Hilliard in the second-ratoon
crop (table 18). When averaged across
both locations, no clone yielded significantly more TS/H than
CP 70-1133. However, CP 91-1238 had a TS/H yield significantly
greater than that of CP 70-1133 at Eastgate. CP 91-1883 yielded
significantly more TS/H than seven other clones at Eastgate but
not significantly more than CP 70-1133. Both CP 91-1238 and CP
91-1883 had high TS/H yields in the first-ratoon crop at Eastgate
last year (Glaz et al. 1999) and
TS/H yields similar to the TS/H yield of CP 70-1133 in the plant-cane
crop at Eastgate 2 years ago (Glaz et
al. 1998).
CP 91-1238 had fair cold tolerance and CP 91-1883 had poor
cold tolerance (table 1). CP 91-1238 was
too susceptible to rust for commercial production in Florida,
and CP 91-1883 had low levels of susceptibility to rust, leaf
scald, and mosaic. CP 91-1238 had a very low fiber percentage,
and CP 91-1883 was moderately low in fiber.
United States
Department of Agriculture
Agricultural
Research Service
The material on this page is in the public
domain.
Original posting: June 20, 2000.
|
|
|
Printable Version
E-mail this page
previous
page
