guy d. collins, ph.d. extension cotton agronomist
DESCRIPTION
Guy D. Collins, Ph.D. Extension Cotton Agronomist. Overview of Cotton Agronomic Research & Extension Program. What is your most limiting factor ??? Water (soils, irrigation capacity, historical rainfall) Weed control (technology options for pigweed control) - PowerPoint PPT PresentationTRANSCRIPT
Guy D. Collins, Ph.D.
Extension Cotton Agronomist
Overview of Cotton Agronomic Research & Extension Program
What is your most limiting factor ???• Water (soils, irrigation capacity, historical rainfall)• Weed control (technology options for pigweed control)• Plant growth (achieving optimal height, droughty soils,
PGRs)• Diseases, nematodes, insects (leaf hairiness)• Planting date, timeliness of inputs• Realistic Yield Potential – field x field basis
Variety performance information…• Official Variety Trials (OVT)• UGA Uniform Cotton Variety Performance Evaluation
Program (County agents)• Industry variety trials• Growers with similar soils/practices• Your own experience
Variety selection criteria
UGA OnFarm Cotton
Variety Performance
Evaluation Program
Variety 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23Combined
Average
DP 1050 458 421 484 581 705 716 673 924 915 1062 1045 1156 1131 1369 1324 1174 1209 1369 1533 1407 1585 1609 1628 1064
DP 1048 433 383 503 577 692 553 742 919 857 965 1014 1089 1171 1085 1156 1242 1324 1327 1482 1352 1426 1504 1713 1022
ST 5458 409 452 408 516 658 769 689 815 795 1038 956 1013 1189 1231 1169 1188 1323 1425 1325 1367 1526 1507 1553 1014
FM 1740 417 389 434 416 619 598 607 824 766 964 948 1036 1191 1049 1199 1211 1197 1248 1350 1455 1262 1474 1603 968
PHY 375 441 472 471 458 693 644 626 836 839 1064 940 1089 1094 1123 1131 1174 1147 1236 1276 1391 1315 1346 1434 967
PHY 565 405 352 462 504 636 694 601 811 864 787 909 923 1202 1073 1259 1204 1158 1292 1373 1261 1321 1466 1635 965
ST 4288 429 490 486 486 670 709 769 774 847 784 894 1099 956 1000 1110 1211 1163 1387 1195 1256 1388 1297 1481 951
DP 0949 391 452 448 500 512 610 641 761 820 878 1012 1094 1069 1165 1122 1107 1209 1390 1257 1304 1393 1255 1335 945
Loc. Average
423 426 462 505 648 661 668 833 838 943 965 1062 1125 1137 1184 1189 1216 1334 1349 1349 1402 1432 1548
2010 UGAUCVPEP Stability & Consistency (TOP 2)
Collins & Whitaker, 2010
Variety 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Combined
Average
PHY 499 227 430 898 803 835 1012 917 1380 1344 1606 1714 1648 1773 1737 1713 1202
DP 1137 215 344 917 785 823 923 958 1295 1445 1626 1495 1599 1799 1774 1746 1183
DP 1050 228 310 821 792 821 945 927 1160 1369 1564 1529 1593 1775 1677 1733 1150
DP 1048 216 304 705 782 765 810 891 1261 1385 1542 1467 1530 1654 1698 1705 1114
ST 5458 163 371 699 743 743 940 1060 1185 1382 1399 1532 1541 1656 1607 1550 1105
FM 1740 147 305 635 726 715 975 928 1113 1428 1461 1585 1541 1507 1633 1626 1088
ST 4288 202 340 590 671 789 878 995 1188 1453 1367 1495 1437 1489 1568 1558 1068
PHY 375 189 316 729 700 608 820 850 1126 1431 1473 1479 1645 1516 1525 1536 1063
PHY 565 148 318 592 671 641 733 722 1000 1060 1191 1381 1465 1418 1467 1588 960
Loc. Average
193 337 732 741 749 893 916 1190 1366 1470 1520 1555 1621 1632 1639 1104
2011 UGAUCVPEP Stability & Consistency (TOP 1)
Collins & Whitaker, 2011
Variety 1 2 3 4 5 6 7 8 9 10 11 12 13 14Combined
Average
DP 1252 B2RF 973 1250 1221 1329 1366 1457 1236 1485 1549 1436 1591 1850 1882 1926 1468
DP 1137 B2RF 759 1363 1201 1253 1389 1372 1396 1461 1400 1521 1486 1784 2080 1943 1458
DP 1050 B2RF 1120 1232 1215 1151 1326 1470 1340 1439 1490 1567 1482 1741 1858 1909 1453
PHY 499 WRF 1185 1013 1183 1601 1266 1291 1269 1404 1357 1398 1495 1682 1933 1843 1423
ST 5458 B2RF 1307 1043 1164 1151 1123 1114 1280 1291 1505 1431 1414 1559 1710 1723 1344
FM 1944 GLB2 1118 1048 1175 1012 1225 1195 1231 1269 1410 1390 1424 1550 1583 1873 1322
FM 1740 B2F 965 1036 1104 1043 1163 993 1375 1276 1221 1502 1371 1496 1647 1839 1288
AM 1511 B2RF 1184 911 1157 1333 1148 1198 963 1347 1284 1168 1440 1576 1584 1592 1277
PHY 565 WRF 905 968 1138 1072 1078 1160 1214 1259 1280 1312 1381 1400 1668 1743 1256
DP 0912 B2RF 965 761 1152 1151 1123 1256 1025 1254 1257 1083 1425 1548 1556 1597 1225
PHY 375 WRF 1012 935 892 1173 1081 904 1212 1146 1030 1248 1303 1377 1633 1565 1179
Loc. Average
1045 1057 1146 1206 1208 1219 1231 1330 1344 1369 1437 1597 1739 1778
2012 Roundup-Based On-Farm Trials (TOP 3)
Collins & Whitaker, 2012
Variety 1 2 3 4 5 6 7 8 9 10 11Combined
Average
PHY 499 WRF 798 995 1275 1381 1274 1376 1319 1353 1578 1958 1714 1366
FM 1944 GLB2 759 829 1039 1083 1372 1383 1303 1494 1650 1423 1682 1274
PHY 565 WRF 635 916 1132 1245 1169 1280 1281 1266 1435 1711 1541 1238
FM 1845 LLB2 651 830 1004 1080 1231 1187 1366 1318 1471 1322 1590 1186
ST 5445 LLB2 626 843 904 976 1047 1259 1115 1434 1611 1435 1653 1173
PHY 375 WRF 585 898 1041 1088 1096 1205 1243 1308 1271 1467 1460 1151
ST 4145 LLB2 670 787 836 1109 992 1074 1151 1141 1275 1186 1337 1051
Loc. Average 675 871 1033 1138 1169 1252 1254 1331 1470 1500 1568
2012 Liberty-Based On-Farm Trials (TOP 2)
Collins & Whitaker, 2012
Variety Selection Error
Cotton Price $ / lb.
Highest Cost $ / A
Lowest Cost $ / A
Average Cost(14 Trials)
$ / A
Top Variety vs
Bottom Variety$1 603 288 456
Top 4 Avg.vs
Mid 4 Avg.$1 274 43 162
Top 4 Avg.vs
Bottom 3 Avg.$1 394 160 298
Top Variety vs
Bottom Variety$ 0.75 452 216 342
Top 4 Avg.vs
Mid 4 Avg.$ 0.75 205 32 121
Top 4 Avg.vs
Bottom 3 Avg.$ 0.75 295 120 223
2012 Cost of Improper Variety Selection (Roundup-based Trials)
Collins & Whitaker, 2012
Variety Selection Error
Cotton Price $ / lb.
Highest Cost $ / A
Lowest Cost $ / A
Average Cost(14 Trials)
$ / A
Top Variety vs
Bottom Variety$1 603 288 456
Top 4 Avg.vs
Mid 4 Avg.$1 274 43 162
Top 4 Avg.vs
Bottom 3 Avg.$1 394 160 298
Top Variety vs
Bottom Variety$ 0.75 452 216 342
Top 4 Avg.vs
Mid 4 Avg.$ 0.75 205 32 121
Top 4 Avg.vs
Bottom 3 Avg.$ 0.75 295 120 223
2012 Cost of Improper Variety Selection (Roundup-based Trials)
Collins & Whitaker, 2012
For 2012 Acreage:
$157,300,000 - $444,600,000
Variety Irwin Pierce ColquittCombinedAverage
GA 303 521 863 1085 823
GA 230 506 872 1004 794All-Tex LA122 500 834 985 773
LA 1110035 507 841 941 763
DP 393 498 807 978 761
PHY 440W 532 915 831 759
LA 1110017 508 752 976 746
SSG Linwood 390 748 1086 741
Loc. Average 495 846 996
2010 GA County Variety Trials - Conventionals Stability & Consistency Collins & Whitaker, 2010
www.ugacotton.com
www.ugacotton.com
1st Position Boll Distribution
Main-stem Node
Bolls
/A
1st Position Boll Production (2011 - averaged over all locations)
Main-stem Node
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
Bol
ls /
A
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
dp 1050dp 1137phy 499
Height, main-stem nodes, lint yield and gin turnout affected by PGR regime in Midville and Tifton.1
PGR Regime
Height Main-stem Nodes Lint Yield Gin Turnout
Midville Tifton Midville Tifton Midville Tifton Midville Tifton
---- inches ---- ------- no. ------- ------- lbs/A ------ ----- % -----
No PGR 55.4 a 48.4 a 22.1 a 19.4 a 1453 b 1970 a 40.3 a 42.0 a
PGR 40.7 b 39.9 b 20.4 b 18.7 b 1521 a 1710 b 39.6 b 40.6 b
1Means within a column followed by same letter are not significantly different at P=0.1.
0
500
1000
1500
2000
2500
Tifton 2012 Lint Yield (lbs/A)
Non-Treated
Agg PGR
**
0
5
10
15
20
25
30
35
40
45
50
Sum of Plant Height (in)Tifton & Midville 2012
* * * *
Relative PGR Requirements of Cotton Varieties (PGR REQUIRMENTS VARY – use only as guide)
Classification Varieties PGR Recommendations
1
Varieties with the most vegetative growth potential, require intensive PGR management
DP 0949 B2RF DP 1048 B2RF DP 1050 B2RF DP 1137 B2RF DP 1252 B2RF PHY 499 WRF
Applications - MULTIPLE Initiation - PRIOR TO BLOOMProduct – MC (all applications, rates vary)
2
Varieties with similar growth potential of 1st class, yet more responsive to PGRs or earlier in maturity
PHY 565 WRF ST 4145 LLB2
Applications – MULTIPLE, MOST CASESInitiation – Squaring to 1st Bloom Product - 1st application - Stance or MC - Sequential app. – MC only
3
Varieties may require PGRs, but pre-bloom initiation not typically necessary, could result in premature cutout, esp. in dryland conditions
AM 1511 B2RF DP 0912 B2RF PHY 375 WRF FM 1773 B2RFDP 1133 B2RF ST 5458 B2RF
Applications – ONE to MULTIPLEInitiation - Bloom initiation likely sufficientProduct - 1st app. (Stance or MC, low rates) - seq. applications - Stance or MC
4
Varieties that may need no PGR applications, or almost always not applied prior to bloom
FM 1740 B2RF FM 1944 B2RF FM 1845 LLB2 ST 4288 B2RF
Application – NONE to ONEInitiation - Bloom initiation almost alwaysProduct – Stance or MC (rates)
UGA Irrigation RecsWeekly Water Requirements (inches per week)
First Bloom
SSDI & OVHD Irrigation Research
Sensor-Based Treatments• Watermark moisture potential sensors
Treatments• Checkbook method-UGA determination for water
requirements:
100% UGA Checkbook 65% UGA Checkbook
Growth StageCm Per Week
Cm/day(1/3 weekly rate)
Applied on M, W, F
Cm Per
Week
Cm/day(1/3 weekly rate)
Applied on M, W, F
Prior to Bloom 2.54 0.85 1.65 0.551st week of bloom 2.54 0.85 1.65 0.552nd week of bloom 3.81 1.27 2.48 0.833rd week of bloom 5.08 1.69 3.30 1.104th week of bloom 5.08 1.69 3.30 1.105th week of bloom 3.81 1.27 2.48 0.836th week of bloom 3.81 1.27 2.48 0.837th weed of bloom 2.54 0.85 1.65 0.558th week of bloom 2.54 0.85 1.65 0.55
END OF BLOOM and afterwards
1.91 0.64 1.22 0.41
AABABAB ABB
C CC
D
AB
Lint Yield: Deep vs Shallow SDI*
p < 0.1 *Data pooled over locations & varieties
AABABAB ABB
C CC
D
AB
Lint Yield: SDI Depth by Trigger*
p < 0.1 *Data pooled over locations & varieties
Lint Yield – Variety * Irrigation Treatment (averaged across locations)
CA
E
CB
E
CD
C C
• FM 1740 > DP 1050 = 40 cb, 70 cb, and 100%• FM 1740 = DP 1050 = dryland, 65% UGA recs.
Total Water (Irr & Rain)
Prebloom Irrigation
DP 0912 B2RF
FM 1944 GLB2
Prebloom IrrigationDP 1050 B2RF
PHY 499 WRF
Final Plant Height*
A
*Data pooled over locations and PGR trt
cm
DP
555
FM
1740
*Data pooled over locations and variety
p = < 0.0001p = 0.0669
No
PGR
ST
2
ST
3
ST
4
MC
8
MC
12
B
A
BBC
C CD
Final Plant Height*
A cm
*Data pooled over locations p = 0.0757
B B BC
CDEDEF EFG
CDE BCD
FGDEF
G
Final Plant Height*
cm
*Data pooled over locations p = 0.0757
Lint Yield DP 555 BR*kg/ha
*Data pooled over locations p = 0.1590
* * * * * *
Lint Yield FM 1740 B2F*kg/ha
*Data pooled over locations
p = 0.1590
* * *
DP 1050 B2RF FM 1740 B2F
Mepex 12 oz/A @ 9-10 leaves
Mepex 8 oz/A @ 9-10 leaves
Stance 3 oz/A @ 9-10 leaves
Stance 2 oz/A @ 9-10 leaves
DP 1050 B2RF FM 1740 B2F
Plant Height (inches)
0
10
20
30
40
50
60
DP 555 BR DP 0949 B2RF DP 0912 B2RF FM 1740 B2F
12oz/A 9lf - 12 oz/A EB - 16 oz/A EB+2wk
12 oz/A EB - 16 oz/A EB+2wk
16 oz/A EB+2wk
No PGR
aabc
degh
abbcdcde
gh
abcbcdfg
i
deefh
i
Plant Height (inches)
0
10
20
30
40
50
60
DP 555 BR DP 0949 B2RF DP 0912 B2RF FM 1740 B2F
12oz/A 9lf - 12 oz/A EB - 16 oz/A EB+2wk
12 oz/A EB - 16 oz/A EB+2wk
16 oz/A EB+2wk
No PGR
Avoid yield-limiting PGR applications
2,4-D Drift
Leaf and bract characteristics of varieties from Georgia trials in 2012.
VarietyCompany
Rating
Leaf Trichomes
(cm-2)
Bract Trichomes
(cm-1)
Leaf Area (cm²)
Bract Area (cm²)
Leaf Grade
PHY 499WRFSemi-
Smooth585.2 a† 52.2 a 129.6 a 9.56 a 3.50
ST 5458B2RF Hairy 286.4 b 37.5 bc 117.5 7.98 b 3.25
PHY 367WRFSemi-
Smooth267.7 b 39.1 b 121.4 b 7.45 bc 3.25
DP 1044B2RFSemi-
Smooth235.8 b 33.1 c 121.5 b 6.90 c 3.75
FM 1740B2F Smooth 38.3 c 39.8 b 121.4 b 7.96 b 3.00
P>F <0.01 <0.01 0.02 <0.01 NS
%CV 51.3 25.6 13.1 16.6 35.5
LSD 64.1 4.60 7.07 0.58 1.79
†Means followed by the same letter in a column are not significantly different at P = 0.05
Days After Planting
50 60 70 80 90 100
Nod
es A
bove
W
hite
Flo
wer
0
2
4
6
8
DP 0912 DP 0949 DP 104 DP 1050 FM 1740 PHY 375 PHY 755
Universal Quantification of Maturity
1st Position Fruiting Node andassociated 2nd and 3rd Position Fruit
6 8 10 12 14 16 18
Acc
umul
ated
Fra
ctio
n of
Tot
al H
arve
stab
le B
olls
0.0
0.2
0.4
0.6
0.8
1.0
DP0912B2RF DP0949B2RF DP104B2RF DP1050B2RF FM1740B2RF PHY375WRF PHY755WRF
Lint Yield
LSD = 187
1 Application 2 Applications
Variety LSD (0.05) = 60
Lint
to
See
d ra
tio (
%)
Thank You