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2019 Oklahoma Replicated Agronomic Cotton Evaluation (RACE) Trial Report

2019 Season Overview

The 2019 cotton season in Oklahoma will likely be remembered by a rough start and a rough finish, with mostly favorable conditions in between. The cool and wet spring impaired planting across much of the state and prevented planting completely in areas of the northern and eastern regions where large increases in cotton acres were predicted. By mid-June, temperatures had returned to normal levels and the remainder of the summer months provided warm and dry conditions, which lasted well into September. While this provided excellent growing conditions for much of the irrigated crop across the western part of the state, dryland cotton experienced periods of stress due to episodic drought and high temperatures, particularly in the second half of July though the month of August in the southwest portion of Oklahoma. However, intermittent showers prevented the crop from failing completely and dryland yields were consequently better than expected across much of the state. In general, irrigated yields tended to be lower than expected, especially after the favorable temperatures present during the flowering and boll fill stage in August and September. One trend that seemed to be fairly stable across the vast majority of cotton acreage was higher than normal micronaire values. While higher micronaire isn’t as uncommon in dryland production, the values in irrigated cotton were higher than what is normally observed. Much like the lower-than-expected yields in the irrigated crop, the elevated micronaire values are likely due to the weather patterns the 2019 crop was exposed to from planting through early fall.

 

As harvest approached and harvest aid applications began, the entire production region in the state was hit by a freeze event that occurred between October 10th and 12th. While this likely only had a minor impact, if any, on boll development and subsequent crop yield, it had a tremendous impact on the efficacy of harvest aids, particularly on fields that had yet to receive an application. Much of the cotton in the state experienced frost damage to leaves and bolls on the upper 1/3 to 1/2 of the plant, with lower portions of the plant mostly unaffected. Optimal boll opening was still achieved for the majority of harvestable or fully mature bolls, although this process generally took longer than normal regardless of the return to warm temperatures through the remainder of October. Despite the crop condition, leaf and color grades were still largely favorable with the vast majority of the crop having color grades of 31 or better and leaf grades of three or less.

 

A total of 23 commercial varieties and one experimental variety from five seed companies were evaluated across five locations in the 2019 RACE Trials (Table 1). There were a multitude of insect and herbicide traits represented within these varieties, including both two and three gene Bt and herbicide traits (Table 2). Seasonal temperature patterns from the southwest and panhandle regions are illustrated by the monthly heat unit accumulation for 2019 compared to the 11-year average for Altus (Figure 1) and Goodwell (Figure 2).

 

Table 1. Seed company participants and variety abbreviations for entries in 2019 Oklahoma RACE Trials.

Seed Company Variety Entries Abbreviation
CROPLAN®    
Genetics 3475 B2XF CG 3475 B2XF
  9598 B3XF CG 9598 B3XF
Deltapine 1612 B2XF DP 1612 B2XF
  1646 B2XF DP 1646 B2XF
  1820 B3XF DP 1820 B3XF
  1845 B3XF DP 1845 B3XF
  1851 B3XF DP 1851 B3XF
  1908 B3XF DP 1908 B3XF
  1948 B3XF DP 1948 B3XF
FiberMax® 2398 GLTP FM 2398 GLTP
  2498 GLT FM 2498 GLT
NexGen® 1828* AMX 1828
  2982 B3XF NG 2982 B3XF
  3930 B3XF NG 3930 B3XF
  3956 B3XF NG 3956 B3XF
  4936 B3XF NG 4936 B3XF
  5711 B3XF NG 5711 B3XF
PhytoGen® 350 W3FE PHY 350 W3FE
  400 W3FE PHY 400 W3FE
  480 W3FE PHY 480 W3FE
Stoneville® 4480 B3XF ST 4480 B3XF
  5471 GLTP ST 5471 GLTP
  5600 B2XF ST 5600 B2XF
  5707 B2XF ST 5707 B2XF

*Experimental variety not released for commercial sale

 

Table 2. Insect and herbicide trait glossary for 2019 Oklahoma RACE Trial entries.

Insect Trait Abbreviation Bt Proteins
Bollgard II® B2 Cry1Ac + Cry2Ab
Bollgard 3® B3 Cry1Ac + Cry2Ab + Vip3A
TwinLink® T Cry1Ab + Cry2Ae
TwinLink Plus® TP Cry1Ab + Cry2Ae + Vip3Aa19
Widestrike 3® W3 Cry1Ac + Cry1F + Vip3A
Herbicide Trait Abbreviation Herbicide Tolerances
FlexEnlist® FE Glyphosate + Glufosinate + 2,4-D
GlyTol LibertyLink® GL Glyphosate + Glufosinate
XtendFlex® XF Glyphosate + Glufosinate + Dicamba

Acknowledgments

First and foremost, we would like to thank the Oklahoma cotton producers who serve as cooperators and allow us to use their land, equipment, and time to conduct these trials. These trials wouldn’t be possible without their cooperation and support. Financial support for these trials was provided by the Cotton Inc. Oklahoma State Support Committee and the participating seed companies. We would like to thank Khawar Arain, Brendan Kelly, and the staff of the Texas Tech University Fiber and Biopolymer Research Institute for providing fiber classing services for these trials. And finally, we would like to thank the Oklahoma Cotton Council for their support of the cotton agronomy program at Oklahoma State University, as well as the cotton industry as a whole in Oklahoma.

 

Appreciation also is extended to the staff of the Southwest Research and Extension Center at Altus,the staff of the Caddo Research Station at Fort Cobb and the staff of the Oklahoma Panhandle Research and Extension Center, Goodwell.

 

Participating Seed Companies

  • Americot/NexGen
  • CROPLAN
  • Genetics
  • Deltapine
  • FiberMax/Stoneville
  • PhytoGen Cottonseed

For more information, visit OSU's Cotton section or NTOK Cotton.

 

Monthly heat unit accumulation from the altus Mesonet station.

Figure 1. Monthly heat unit (DD 60) accumulation from the Altus Mesonet station.

 

Monthly heat unit accumulation from the Goodwell Mesonet station.

Figure 2. Monthly heat unit (DD 60) accumulation from the Goodwell Mesonet station.

 

Table 3A. 2019 Greer Co. Dryland RACE Trial Results.

Planted: June 12th

Seeding Rate: 25,000 40” row spacing

Harvested: November 4th

Variety Lint Yield lbs./acre Turnout %

Micronaire1 Fiber Length inches
DP 1845 B3XF 741 - a 38.43 - a 5.69 - bc 1.10 - b
ST 5600 B2XF 635 - b   37.51 - ab   6.26 - a   1.08 - bc
DP 1646 B2XF 629 - b   37.41 - ab  5.32 - de   1.08 - bc
CG 9598 B3XF 628 - b   37.20 - ab   5.60 - b-d   1.09 - b
DP 1820 B3XF 621 - bc 36.88 - bc   5.65 - bc   1.11 - b
NG 4936 B3XF 611 - bc   34.77 - de 5.20 - e   1.08 - bc
ST 5707 B2XF 597 - bc  33.71 - e   5.90 - ab   1.11 - b
NG 3930 B3XF 595 - bc   35.93 - cd   5.41 - c-e   1.05 - c
DP 1851 B3XF 594 - bc  36.86 - bc  5.39 - c-e   1.05 - c
NG 5711 B3XF 576 - c   35.60 - d   5.25 - e  1.10 - b
DP 1948 B3XF 478 - d   36.99 - bc 4.79 - f 1.18 - a
Average 610   36.48   5.50  1.09
p-value <.0001  <.0001  <.0001   <.0001
pLSD 46   1.27  0.32   0.04
CV 11.37 3.78  7.56  3.60

Table 3B. 2019 Greer Co. Dryland RACE Trial Results (cont'd).

Variety Uniformity % Fiber Strength grams/tex   Loan Valuecents/lb. Return per Acre3 $
DP 1845 B3XF 81.30 - ab 29.5 - c 49.08 - b-d $319 - a
ST 5600 B2XF 81.70 - ab 30.1 - bc 48.57 - b-d $266 - b
DP 1646 B2XF 79.70 - c 27.7 - d 48.68 - b-d $261 - b
CG 9598 B3XF 82.20 - ab 30.2 - bc 49.07 - b-d $264 - b
DP 1820 B3XF 81.43 - ab 31.1 - b 50.12 - bc $266 - b
NG 4936 B3XF 81.37 - ab 27.6 - de 49.88 - b-d $262 - b
ST 5707 B2XF 82.25 - ab 33.2 - a 49.73 - b-d $265 - b
NG 3930 B3XF 81.13 - bc 26.2 - e 47.73 - cd $244 - bc
DP 1851 B3XF 81.63 - ab 31.5 - b 47.58 - d $241 - bc
NG 5711 B3XF 82.33 - ab 30.1 - bc 50.77 - b $249 - b
DP 1948 B3XF 82.67 - a 31.6 - ab 54.10 - a $216 - c
Average 81.61 29.89 49.57 $259
p-value 0.0341 <.0001 0.0023 0.0002
pLSD 1.49 1.54 2.54 $30
CV 1.29 6.90 4.29 11.73

1Micronaire samples from this location were re-classed to ensure accuracy.

2Color and leaf grades set to base levels (41 and 4, respectively) due to lack of proper lint cleaner on gin.

3Return per acre calculated as (lint yield per acre X loan value per pound) - seed cost per acre.

 

Table 2A. 2019 Jackson Co. Irrigated RACE Trial Results.

Planted: May 17th

Seeding Rate: 40,000 38” row spacing

Irrigation: sub-surface drip located on 72” spacing in furrow

Harvested: November 4th

TRIAL SUFFERED SLIGHT – MODERATE VISUAL INJURY DUE TO OFF-TARGET MOVEMENT OF 2,4-D.

Variety Lint Yield (lbs. per acre)  Turnout (%)  Micronaire Length (inches) 
PHY 400 W3FE* 1,906 - a 40.15 - a-c 4.53 - bc 1.18 b
DP 1845 B3XF 1,894 - a 40.50 - ab 4.45 - c 1.23 a
FM 2498 GLT 1,851 - ab 39.71 - a-d 5.26 - a 1.15 bc
FM 2398 GLTP 1,835 - a-c 42.30 - a 5.19 - a 1.17 bc
PHY 480 W3FE* 1,828 - a-c 37.52 - c-e 4.59 - bc 1.16 bc
PHY 350 W3FE* 1,786 - a-d 37.22 - de 4.67 - bc 1.15 bc
ST 5471 GLTP 1,767 - a-d 37.50 - de 4.60 - bc 1.13 c
DP 1820 B3XF 1,706 - b-d 39.78 - a-d 4.68 - bc 1.23 a
NG 5711 B3XF 1,701 - cd 38.33 - b-d 4.35 - c 1.20 ab
AMX 1828 1,643 - de 37.14 - de 4.91 - ab 1.18 b
NG 3930 B3XF 1,532 - e 35.68 - e 4.56 - bc 1.16 bc
Average 1,768 38.71 4.71 1.18
p-value 0.0007 0.0017 0.002 0.0049
pLSD 146 0.0017 0.405 0.049
CV 7.53 5.86 7.46 3.37

Table 2B. 2019 Jackson Co. Irrigated RACE Trial Results.

Variety  Uniformity (%)   Strength  (g/tex)   Loan Value(cents/pound)   Return2
($/acre) 
PHY 400 W3FE* 82.37 - ab  31.60 - b   54.17 - a   $962 - a
DP 1845 B3XF 81.77 - b   31.10 - bc   54.12 - a   $953 - a
FM 2498 GLT 82.27 - ab   31.10 - bc   50.95 - b   $880 - a-c
FM 2398 GLTP 83.30 - a   30.43 - cd   51.65 - b  $882 - a-c
PHY 480 W3FE* 83.50 - a   31.20 - bc   54.03 - a  $918 - ab
PHY 350 W3FE* 83.13 - a   30.47 - cd   53.92 - a  $893 - a-c
ST 5471 GLTP 81.50 - b   31.03 - bc 53.85 - a   $888 - a-c
DP 1820 B3XF 82.73 - ab  33.50 - a  54.23 - a   $854 - bc
NG 5711 B3XF 81.47 - b   29.70 - d   53.83 - a   $846 - bc
AMX 1828 83.60 - a   31.47 - bc   53.42 - a   $815 - cd
NG 3930 B3XF 82.50 - ab   28.53 - e 53.65 - a   $757 - d
Average 82.56 30.79 53.44 $877
p-value 0.0251 <.0001 <.0001 0.0026
pLSD 1.37 1.06   0.88   $84  
CV 1.21    4.39   2.14   8.12  

1Color and leaf grades set to base levels (41 and 4, respectively) due to lack of proper lint cleaner on gin.

2Return per acre calculated as (lint yield per acre X loan value per pound) - seed cost per acre.

*Variety tolerant to 2,4-D.

 

Table 3A. 2019 Texas Co. Irrigated RACE Trial Result.

Planted May 16th

Seeding Rate: 52,000

Irrigation: center pivot

Harvested: November 14th – 15th

Variety Lint Yield (lbs. per acre)  Turnout (%)  Micronaire Length (inches) 
NG 2982 B3XF 1,168 - a 32.89 - a-c 4.41 - bc 1.07 - d
DP 1612 B2XF 1,161 - a 32.89 - a-c 4.58 - ab 1.11 - c
DP 1820 B3XF 1,155 - a 35.36 - a 4.41 - bc 1.17 - a
CG 3475 B2XF 1,150 - a 33.96 - ab 4.66 - a 1.07 - d
DP 1908 B3XF 1,132 - ab 33.83 - ab 4.22 - cd 1.16 - ab
NG 3930 B3XF 1,113 - ab 33.80 - ab 4.07 - d 1.13 - bc
NG 3956 B3XF 1,073 - bc 32.76 - bc 4.23 - cd 1.10 - c
ST 4480 B3XF 1,019 - c 31.01 - c 4.07 - d 1.15 - ab
Average 1,121 31.01 - c 4.33 1.12
p-value 0.0053 0.0872 0.0006 <.0001
pLSD 70 2.49 0.24 0.03
CV 5.57 5.04 5.67 3.73

Table 3B. 2019 Texas Co. Irrigated RACE Trial Result.

Variety Uniformity (%) Strength (g/tex)  Loan Value1 (cents/pound) 
Return2
($/acre) 
NG 2982 B3XF 80.90 29.6 - bc 46.98 - c $448 - cd
DP 1612 B2XF 81.37 30.4 - ab 47.50 - c $466 - b-d
DP 1820 B3XF 81.87 31.8 - a 49.92 - b $484 - a-c
CG 3475 B2XF 81.33 29.4 - bc 46.77 - c $450 - cd
DP 1908 B3XF 81.80 31.6 - a 54.12 - a $520 - a
NG 3930 B3XF 81.87 28.4 - c 52.73 - a $503 - ab
NG 3956 B3XF 81.90 29.7 - bc 47.98 - c $431 - d
ST 4480 B3XF 81.70 30.8 - ab 54.42 - a $465 - b-d
Average 81.59 30.19 50.05 $471
p-value 0.5685 0.0052 <.0001 0.008
pLSD 1.18 1.56 1.89 $43
CV 0.82 4.58 6.45 7.76

1Color and leaf grades set to base levels (41 and 4, respectively) due to lack of proper lint cleaner on gin.

2Return per acre calculated as (lint yield per acre X loan value per pound) - seed cost per acre.

 

Table 4A. 2019 Tillman Co. Dryland RACE Trial Results.

Planted: June 18th

Seeding Rate: 26,000 40” row spacing

Harvested: October 30th

Variety Lint Yield (lbs. per acre)  Turnout (%)  Micronaire Length (inches) 
PHY 350 W3FE 639 - a 28.18 - cd 4.99 - a 1.10 - e
ST 5707 B2XF 575 - ab 27.09 - d 4.92 - a 1.15 - bc
PHY 400 W3FE 573 - ab 30.15 - a 4.57 - bc 1.07 - f
PHY 480 W3FE 565 - ab 29.94 - a 4.57 - bc 1.11 - de
ST 5600 B2XF 562 - ab 29.15 - a-c 4.99 - a 1.12 - c-e
DP 1948 B3XF 554 - ab 29.90 - ab 4.67 - a-c 1.22 - a
DP 1851 B3XF 528 - ab 29.15 - a-c 4.42 - bc 1.12 - b-e
NG 4936 B3XF 514 - a-c 28.17 - cd 4.57 - bc 1.14 - b-d
NG 5711 B3XF 481 - bc 27.10 - d 4.38 - c 1.14 - b-d
NG 3930 B3XF 443 - bc 26.98 - d 4.51 - bc 1.12 - c-e
CG 9598 B3XF 380 - c 28.28 - b-d 4.47 - bc 1.15 b
Average 528 28.55 4.66 1.13
p-value 0.0806 0.0019 0.0052 <0.0001
pLSD 146.9 1.64 0.3385 0.0309
CV 28.84 5.50 6.76 3.66

Table 4B. 2019 Tillman Co. Dryland RACE Trial Results.

Variety Uniformity (%)  Strength (g/tex)  Loan Value1 (cents/pound)  Return2 ($/acre) 
PHY 350 W3FE 82.7 - a-d 31.17 - c 52.00 $288
ST 5707 B2XF 83.1 - a-c 34.67 - a 52.62 $266
PHY 400 W3FE 81.5 - d 30.80 - c 52.48 $255
PHY 480 W3FE 83.5 -  ab 33.53 - ab 53.40 $256
ST 5600 B2XF 82.1 - b-d 32.13 - bc 52.27 $247
DP 1948 B3XF 83.9 - a 35.20 - a 54.32 $256
DP 1851 B3XF 83.2 - a-c 35.23 - a 53.85 $240
NG 4936 B3XF 82.1 - cd 30.47 - c 53.55 $230
NG 5711 B3XF 81.9 - cd 32.07 - bc 53.92 $214
NG 3930 B3XF 82.5 - b-d 30.37 - c 53.43 $194
CG 9598 B3XF 82.5 - b-d 31.90 - bc 53.95 $159
Average 82.64 32.50 53.25 $237
p-value 0.0425 0.0002 0.1304 0.1055
pLSD 1.3743 1.0228 NS NS
CV 1.24 6.41 2.20 33.08

1Color and leaf grades set to base levels (41 and 4, respectively) due to lack of proper lint cleaner on gin.

2Return per acre calculated as (lint yield per acre X loan value per pound) - seed cost per acre.

 

Seth Byrd

Cotton Extension Specialist

 

Jerry Goodson

Extension Assistant, IPM

 

Aaron Henson

Tillman Co. Extension Educator

 

Bradley Wilson

Graduate Research Assistant

 

Heath Sanders

Area Agronomist

 

Charity Martin

Harmon Co. Extension Educator

 

Cayden Catlin

Graduate Research Assistant

 

Josh Bushong

Area Agronomist

 

Gary Strickland

Greer and Jackson Co. Extension Educator

and Dryland Cropping Systems Specialist

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