uga cotton extension program guy d. collins, ph.d. extension cotton agronomist university of georgia...
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UGA Cotton Extension Program
Guy D. Collins, Ph.D.
Extension Cotton Agronomist
University of GeorgiaTifton, GA
2010…Replacing DP 555 BG/RR• DP 555 BG/RR planted on approximately
82.53 % of cotton acres in GA during 2009
• Total 2009 GA cotton acreage = 990,000
• Dealers allotted 33 % of 2009 DP 555 BG/RR for 2010
• 2010 GA cotton acreage = 1,250,000
• In 2010, an estimated 900,000+ acres will be planted to new/other varieties
Variety selection criteria
• YIELD potential
• YIELD stability
• Technology
• Fiber quality
• Maturity and plant growth characteristics
Late Varieties – Irr. & Dryland- by technology
0
500
1000
1500
2000
2500
BG2/RF W/R BG/RR W/RF LL/BG2 RF
Lint Yield (lbs/A)
1177 1113 1098 1068 1064 1050 1022 1016 1002 987
0
200
400600
800
1000
1200
1400
ST 5458B2RF
FM 1740B2RF
PHY 370WR
DP 0935B2RF
ST 5288B2RF
PHY 375WRF
DP 0949B2RF
DP 0912B2RF
DP 555BR
PHY 485WRF
2009 GA County Trials – Dryland (Burke, Candler, Colquitt, Early, Jefferson, Lowndes, SE Gin)
Inconsistency among varieties tested at each location….difficult to evaluate!!
Lint Yield (lbs/A)
Uniform County Variety Trial Program
DP
0949
B2R
F31
0
PHY
565
WRF
309
ST 4
288
B2R
F30
8
DP
1048
B2R
F30
7
PHY
485
WRF
306
ST 5
458
B2R
F30
5
DP
1050
B2R
F30
4
PHY
375
WRF
303
FM 1
740
B2R
F30
2
Rep 3
DP
555
BR
301
PHY
565
WRF
210
DP
0949
B2R
F20
9
DP
1048
B2R
F20
8
ST 4
288
B2R
F20
7
ST 5
458
B2R
F20
6
PHY
485
WRF
205
PHY
375
WRF
204
DP
1050
B2R
F20
3
DP
555
BR
202
Rep 2
FM 1
740
B2R
F20
1
DP
0949
B2R
F11
0
PHY
565
WRF
109
ST 4
288
B2R
F10
8
DP
1048
B2R
F10
7
PHY
485
WRF
106
ST 5
458
B2R
F10
5
DP
1050
B2R
F10
4
PHY
375
WRF
103
FM 1
740
B2R
F10
2
Rep 1
DP
555
BR
101
Field EdgeD
P 09
49 B
2RF
310
PHY
565
WRF
309
ST 4
288
B2R
F30
8
DP
1048
B2R
F30
7
PHY
485
WRF
306
ST 5
458
B2R
F30
5
DP
1050
B2R
F30
4
PHY
375
WRF
303
FM 1
740
B2R
F30
2
Rep 3
DP
555
BR
301
PHY
565
WRF
210
DP
0949
B2R
F20
9
DP
1048
B2R
F20
8
ST 4
288
B2R
F20
7
ST 5
458
B2R
F20
6
PHY
485
WRF
205
PHY
375
WRF
204
DP
1050
B2R
F20
3
DP
555
BR
202
Rep 2
FM 1
740
B2R
F20
1
DP
0949
B2R
F11
0
PHY
565
WRF
109
ST 4
288
B2R
F10
8
DP
1048
B2R
F10
7
PHY
485
WRF
106
ST 5
458
B2R
F10
5
DP
1050
B2R
F10
4
PHY
375
WRF
103
FM 1
740
B2R
F10
2
Rep 1
DP
555
BR
101
Field Edge
15 trial sites and 22 cooperating agents
Training / mentoring program for younger agents
Funds to support plant growth evaluation and harvest equipment
Similar trial for Dr. Peng Chee’s conventional lines
____________Irrigated____________ ________Dryland________Avg Yield
- locs
combinedVariety Bainbridge Midville Plains Tifton Midville Plains Tifton
FM 1740 B2RF 1683 2145 2119 2187 1651 1770 1939 1928
DG 2570 B2RF 1538 2111 2377 1980 1730 1913 1794 1920
09R619 B2R2 1466 2101 2563 2034 1570 1803 1695 1890
DP 0920 B2RF 1691 2100 2166 2154 1660 1725 1530 1861
PHY 370 WR 1455 1979 2255 2005 1720 1756 1753 1846
DP 0935 B2RF 1510 2100 2250 2006 1702 1708 1557 1833
DP 0924 B2RF 1438 2120 2179 1649 1633 1770 1874 1809
DP 0912 B2RF 1407 2050 2297 1918 1591 1827 1508 1800
ST 5288 B2F 1296 2140 2189 1880 1537 1834 1652 1790
PHY 367 WRF 1591 1883 2112 1887 1652 1675 1725 1789
CG 3220 B2RF 1315 2083 2151 1812 1755 1537 1612 1752
ST 4498 B2RF 1722 1972 2065 1752 1625 1577 1542 1751
AM1550 B2RF 1430 1762 2014 2003 1508 1623 1741 1726
PHY 375 WRF 1297 1765 2022 1881 1639 1755 1569 1704
ST 4288 B2F 1306 1941 1948 1979 1479 1625 1489 1681
2009 GA Cotton OVT Consistency & Variability
– Top 15 Early Varieties excluding Athens
Yield FM 1740 vs. DP 555
Plant Height
46.1
41.9 40.8 40.1 38.6
0
5
10
15
20
25
30
35
40
45
50
Hei
ght (
inch
es)
DP555 PHY375 DP0935 ST5458 FM1740
A
AB AB B B
- 7.5
Total Main-stem Nodes
26.42
22.16 22.71 21.89 21.14
0
5
10
15
20
25
30
Mai
n-st
em N
odes
DP555 PHY375 DP0935 ST5458 FM1740
A
BC B BC C
- 5.28
Total Boll Production
318,762 324,958
293,110308,211
321,279
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
Bolls
/ A
DP555 PHY375 DP0935 ST5458 FM1740
Percent Open Bolls
80.9
89.895.4
88.294.3
0
10
20
30
40
50
60
70
80
90
100
% O
pen
Bolls
DP555 PHY375 DP0935 ST5458 FM1740
BAB
AAB
A
+14.5%
Boll Production Compared to DP 555 BG/RR (1st Position)
Early Varieties Lint YieldFM 1740 B2RF 1928DG 2570 B2RF 192009R619 B2R2 1890DP 0920 B2RF 1861PHY 370 WR 1846DP 0935 B2RF 1833DP 0924 B2RF 1809DP 0912B2RF 1800ST 5288 B2F 1790PHY 367 WRF 1789CG 3220 B2RF 1752ST 4498 B2RF 1751AM 1550 B2RF 1726PHY 375 WRF 1704ST 4288 B2F 1681BCSX 1035 LLB2 1670SSG CT Linwood 1666NG 3331 B2RF 1653All-Tex Epic RF 1648
2009 GA Cotton OVT – Irr. & Dry combined– Top 19 Varieties (Bainbridge, Midville, Plains,Tifton)
Late Varieties Lint YieldDP 0949 B2RF 182609R621 B2R2 1788PHY 370 WR 1774DP 555 BG/RR 1767PHY 375 WRF 1755PHY 565 WRF 1747ST 5458 B2RF 1721DP 0935 B2RF 1707PHY 5922 WRF 1699DP 161 B2RF 1698PHY485 WRF 1671ST 5288 B2F 1653ST 5327 B2RF 1644DP 164 B2RF 1624BCSX 1015 LLB2 1620FM 1845 LLB2 1609PHY 480 WR 1609DP 174 RF 1591BCSX 1025 LLB2 1567
2010 Weather
75
80
85
90
95
100
105
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
2010
2000-2009
Changes in Management• DP 555 BGRR® = full-season variety, very aggressive growth
• New varieties = less aggressive growth??? earlier maturity ???
true cutout??
Growth Management for New VarietiesNew varieties….rank
growth could still result when excessive rains occur
BUT… pay close attention to plant growth when making PGR decisions, because excessive PGR use could inhibit yield potential in some of these newer early-maturing varieties
-Prebloom apps
-First bloom apps
-Midbloom apps
DP 1050 B2RF
Non-treated 12 oz/A @ 9-10 leaves
PHY 565 WRF
Non-treated 12 oz/A @ 9-10 leaves
Plant Height – Nontreated Cotton
0
5
10
15
20
25
30
35
40
DP 105
0 B2R
F
DP 094
9 B2R
F
PHY 375
WRF
ST 428
8 B2F
DP 555
BR
ST 545
8 B2F
PHY 565
WRF
DP 104
8 B2R
F
FM 1
740
B2RF
PHY 485
WRF
inches
Plant Height – Treated Cotton
0
5
10
15
20
25
30
DP 105
0 B2R
F
DP 094
9 B2R
F
PHY 375
WRF
ST 428
8 B2F
DP 555
BR
ST 545
8 B2F
PHY 565
WRF
DP 104
8 B2R
F
FM 1
740
B2RF
PHY 485
WRF
inches
Percent of Non-treated (Height)
0102030405060708090
100
DP 105
0 B2R
F
DP 094
9 B2R
F
PHY 375
WRF
ST 428
8 B2F
DP 555
BR
ST 545
8 B2F
PHY 565
WRF
DP 104
8 B2R
F
FM 1
740
B2RF
PHY 485
WRF
percent
DP 1050 B2RF vs FM 1740 B2F
Stance 3 oz/A @ 9-10 leaves
Stance 2 oz/A @ 9-10 leaves
DP 1050 B2RF vs FM 1740 B2F
Mepex 12 oz/A @ 9-10 leaves
Mepex 8 oz/A @ 9-10 leaves
Prebloom Growth Management
LRM 1x LRM 2x MEB 1x MEB 2x
9 leaf 4 oz/A 8 oz/A 8 oz/A 16 oz/A
+ 1 week 4 oz/A 8 oz/A ----------- ----------
+ 2 week 4 oz/A 8 oz/A ----------- ----------
First Bloom 4 oz/A 8 oz/A 8 oz/A 16 oz/A
Additionally, we are evaluating the necessity of prebloom applications, and or how well we can control growth with later-season applications
Prebloom Growth Management
LRM 8 oz/A 4 apps
MEB 8 oz/A 2 apps MEB 16 oz/A 2 apps
LRM 4 oz/A 4 apps
Non-treated
Collaborative/Other Projects
Questions ??Questions ??