University of FloridaSolutions for Your Life

Download PDF
Publication #SS-AGR-373

2013 Evaluation of Non-Irrigated Early-Maturing Cotton Varieties in Jay, Florida1

Darcy Telenko and Michael Donahoe 2

This report includes a summary of the 2013 early-season cotton Official Variety Trial in Jay, Florida. It shows the performance of 11 cotton varieties. This data represents only one year and one location, and readers are cautioned that test results should be considered over several locations and years before final conclusions are valid.

Early-season varieties that were evaluted

1.DP 1137 B2RF

2.DP 1321 B2RF

3.MON 12R224B2R2

4.DP 0912 B2RF

5.PHY 375 WRF

6.PHY 367 WRF

7.PHY 339 WRF

8.PHY 499 WRF

9.PHY 333 WRF

10.NG 1511 B2RF

11.AM 1550 B2RF

Figure 1. 

Cotton Variety Trial in Jay, Florida


Credit:

Michael Donahoe


[Click thumbnail to enlarge.]

2013 Growing Conditions and Experimental Design

The study area soil type was a Tifton sandy loam with 2% organic matter and a pH of 6.5 with a history of cotton production. The field was planted in a rotation of peanut and cotton in 2012 and 2011, respectively. Each cotton variety was planted on May 14 under conventional tillage. Plots consisted of four, 25-foot rows with 36 inches row spacing and were replicated in four randomized complete blocks. Standard production practices for non-irrigated cotton production were followed throughout the season. Pendimethalin (Stealth, Loveland Products) 1 qt./ac. was applied on May 8 for pre-plant weed control, and glyphosate (Roundup, Monsanto) 22 oz./ac. was applied June 20 and July 31 for post-emergence weed control. Dicrotophos (Bidrin 8, Amvac) 3.2 oz./ac. was applied on May 31, clothianidin (Belay, Valent) 4 oz/A was applied on July 30, and cyfluthrin (Tombstone, Loveland Products) 3.2 oz./ac. was applied on August 7 for insect control. Pyraclostribin (Headline, BASF Crop Protection) 9 oz./ac. was applied on July 30 for disease control. Growth regulator Potenza was applied 12 oz./ac. on July 30 and 16 oz./ac. on August 7. Harvest aid treatments included thidiazuron (Takedown SC, Loveland Products) 2.0 oz./ac. and carfentrazone+fluthiacet (Display, FMC) 0.5 oz./ac. applied on October 14. Cotton was harvested with a conventional spindle picker on November 4, and samples were sent to a commercial lab for fiber analysis.

Rainfall in May, June, and October was 7.1, 0.74, and 4.21 inches below normal, respectively; rainfall in July, August, and September was 5.23, 1.37, and 3.65 inches above normal, respectively. Rainfall during the cotton growing season totaled 33.23 inches, which was 1.61 inches below normal. Weather data was obtained from the Florida Automated Weather Network (FAWN) station located on Jay research farm, and "normal" represents the mean for the past 54 years of records (Table 1).

Table 1

Summary

Stand counts were significantly different on May 28 when PHY 375 WRF had the lowest population of 1.78 plants/ft., while DP 0912 had the highest plant population of 2.49 plants/ft. (Table 2). Deer damage was noted, and dead plants per plot were also enumerated. DP 1321 B2RF had the greatest damage, while no damage was detected in PHY 333 WRF and NG 1511 B2RF plots. Plots were replanted by hand on June 12 in areas where damage occurred, and seed germinated on June 17. A final stand count was taken on July 27, and there were no significant differences between varieties. Cotton stand ranged from an average of 1.76 to 2.04 plants/ft. Differences in plant height were detected on August 6—DP 1137 B2RF was the tallest variety (100 cm), while DP 0912 B2RF was the shortest (85 cm.). No differences between varieties for the number of flowers per plant on August 6 were detected.

Figure 2. 

Cotton harvest in Jay, Florida


Credit:

Michael Donahoe


[Click thumbnail to enlarge.]

Table 2

No differences between varieties for the number of open bolls on September 16 were detected (Table 3). Seed cotton yield ranged from 3,112 to 3,888 lb./ac., and no differences between varieties were detected. Significant differences were detected for gin turn-out (GTO) between varieties with PHY 333 WRF having the highest percentage of lint to seed cotton (40%), while DP 0912 B2RF had the lowest at 36%. Although differences were detected for GTO, no significant differences in total lint yield (1,169—1,417 lb. lint/ac.) or number of bales/ac. (2.43—2.95 bales/ac.) were detected between the eleven varieties tested. The three highest yielding varieties were MON 12R224B2R2, PHY 333 WR, and DP 1137 B2RF.

Table 3

Tables

Table 1. 

Weather conditions during 2013 in Jay, Florida

Month

Total rainfall (in.)

Average minimum air temperature (°F)

Average maximum air temperature (°F)

May

0.7 (7.1 below normal*)

43.0

91.8

June

5.8 (0.7 below normal)

65.5

93.8

July

11.8 (5.2 above normal)

67.6

92.9

August

5.5 (1.4 above normal)

67.5

95.2

September

8.0 (3.7 above normal)

58.6

93.7

October

1.7 (4.2 below normal)

38.0

88.1

*"Normal" represents the mean for the past 54 years of records.

Table 2. 

Effect of variety on emergence, growth and flower number in cotton

Variety

Plants/ft.1

(May 28)

Dead plants/plot2 (May 28)

Plants/ft.1 (July 27)

Height3(cm.) (August 6)

Flowers/plant3 (August 6)

DP 1137 B2RF

2.31 a-c

4.5 a-c

2.03

100.0 a

2.0

DP 1321 B2RF

2.06 cd

16.8 a

1.99

90.5 cd

2.0

MON 12R224B2R2

2.24 a-c

12.5 a-c

1.98

93.8 a-c

2.1

DP 0912 B2RF

2.49 a

0.0 c

2.01

85.0 d

1.4

PHY 375 WRF

1.78 d

11.5 a-c

2.01

92.2 b-d

1.7

PHY 367 WRF

2.26 a-c

4.3 a-c

2.04

94.9 a-c

2.2

PHY 339 WRF

2.20 a-c

14.8 ab

2.03

96.1 a-c

1.5

PHY 499 WRF

2.40 a-c

0.8 c

1.88

93.2 a-c

1.4

PHY 333 WRF

2.45 ab

0.0 c

1.86

98.1 ab

2.5

NG 1511 B2RF

2.27 a-c

0.0 c

1.76

91.9 b-d

2.1

AM 1550 B2R

2.14 bc

3.8 bc

1.79

88.7 cd

2.4

Mean

2.24

6.3

1.94

93.1

1.9

LSD

0.35

12.5

n.s.

7.5

n.s.

CV

11.00

138.89

11.68

21.98

101.30

P(F)

0.0197

0.0489

0.6139

0.0773

0.1221

1Determined from counts of two, 25-ft. rows per plot. Final count taken on July 27 after replant from deer damage.

2Deer damage caused dead plants that were observed on May 28.

3Height and flower number determined by averaging 10 plants per plot.

Means followed by the same letter(s) in a column are not significantly different, according to Fisher’s Protected LSD (P=0.05), except for height means separated at alpha =0.10.[MJN1]

Table 3. 

Effect of variety on yield of cotton[MJN1]

Variety

Open bollsv

(Sep. 16)

Yield

lb/ac.w

GTOx

Lint/ac.y

Bales/ac.z

DP 1137 B2RF

5.5

3464

39.0 a-c

1356

2.83

DP 1321 B2RF

6.1

3224

36.9 d-f

1191

2.48

MON 12R224B2R2

5.3

3888

36.4 ef

1417

2.95

DP 0912 B2RF

6.9

3496

35.6 f

1246

2.60

PHY 375 WRF

4.4

3112

37.6 c-e

1169

2.43

PHY 367 WRF

12.6

3224

36.5 d-f

1179

2.46

PHY 339 WRF

11.8

3472

37.8 b-e

1311

2.73

PHY 499 WRF

7.1

3368

38.1 a-d

1284

2.68

PHY 333 WRF

7.4

3440

39.7 a

1367

2.85

NG 1511 B2RF

6.4

3312

39.3 ab

1299

2.71

AM 1550 B2R

6.0

3200

38.0 a-e

1220

2.54

Mean

7.2

3382

37.7

1276

2.66

LSD

n.s.

n.s.

0.02

n.s.

n.s.

CV

81.35

10.81

3.15

11.73

11.73

P(F)

0.1283

0.2540

0.0004

0.3146

0.3146

vDetermined from counts in a 5-ft. section of each row per plot.

wWeight (lb./ac.) includes lint + seed.

xGTO = gin turn out lint/seed cotton.

yWeight of lint (lb/.ac.).

zBales/ac. are weight of lint only at 480 lb./bale

Plots were harvested on November 4. Means followed by the same letter(s) in a column are not significantly different, according to Fisher’s Protected LSD (P=0.05).

Table 4. 

Effect of variety on lint yield and fiber quality

Variety

Gin turnouts

(%)

Lint yield t

(lb/A)

Mic u

Fiber lengthv

(in.)

Fiber strengthw

(g/tex)

Unifor-mityx

(%)

HVI colory

Leaf gradez

Net loan price (¢/lb)

Lint value ($/A)

MON 12R224B2R2

36.4 ef

1417

4.2 ef

1.17 a

30.0 bc

81.8 a-c

31-2

3.3 ab

56.65

803

DP 1137 B2RF

39.0 a-c

1356

4.7 a-c

1.13 bc

28.7 cd

82.1 ab

31-1

2.3 c

56.75

770

PHY 333 WRF

39.7 a

1367

4.4 c-e

1.18 a

30.3 b

82.0 ab

41-1

3.8 a

54.35

743

PHY 339 WRF

37.8 b-e

1311

4.3 de

1.17 a

30.5 ab

81.8 a-c

31-2

3.0 b

56.50

741

NG 1511 B2RF

39.3 ab

1299

4.9 a

1.13 bc

30.5 ab

81.5 a-c

41-1

3.0 b

54.20

704

PHY 499 WRF

38.1 a-d

1284

4.7 a-c

1.15 ab

31.7 a

82.6 a

41-1

3.8 a

54.45

704

DP 0912 B2RF

35.6 f

1246

4.7 a-c

1.11 cd

30.6 ab

82.3 a

31-2

3.0 b

56.50

699

AM 1550 B2R

38.0 a-e

1220

4.7 a-c

1.10 d

28.6 d

80.6 c

31-2

2.3 c

55.70

680

DP 1321 B2RF

36.9 d-f

1191

4.8 ab

1.11 cd

29.6 b-d

80.9 bc

31-2

3.0 b

56.20

669

PHY 375 WRF

37.6 c-e

1169

4.0 f

1.14 bc

29.8 b-d

81.9 ab

31.2

3.5 ab

56.45

660

PHY 367 WRF

36.5 d-f

1179

4.6 b-d

1.13 bc

29.8 b-d

81.7 a-c

41-1

3.3 ab

54.00

637

Mean

37.7

1276

4.5

1.14

30.0

81.7

41

3.1

54.25

692

LSD

0.02

n.s.

0.3

0.03

1.3

1.3

 

0.7

   

CV

3.15

11.73

4.9

1.79

3.1

1.13

 

16

   

P(F)

0.0004

0.3146

0.0001

0.0001

0.0027

0.1576

 

0.0008

   

sGin turnout= weight of lint as a percent of seed cotton weight, which is composed of lint, seed, trash, and excess moisture.

tWeight of lint (lb/A).

uMic (micronaire)= a measure of fiber fineness or maturity. An airflow instrument measures the air permeability of a given mass of cotton lint compressed to a fixed volume. Low "mike" values indicate finer or less mature fibers.

vFiber length= average fiber length of the longer one-half of the fibers sampled, in hundredths of an inch.

wFiber strength = force required to break a bundle of fibers one tex unit in size. A tex is the weight in grams of 1,000 meters of fiber. HVI clamp jaw spacing is 1/8 inch.

xUniformity = length uniformity is the ratio between the mean length and the upper-half mean length of the fibers, expressed as a percentage.

yHVI Color = color grade is a function of white reflectance (Rd) and yellowness (+b) of the lint sample. The HVI color code identifies the quadrant of the Nickerson-Hunter cotton colorimeter diagram in which Rd and +b values intersect (USDA, 1999).

zLeaf Grade = visual estimate of the amount of cotton plant leaf particles in a sample of lint. There are seven leaf grades represented by physical standards, plus a below grade designation.

Entries are listed according to lint value in $/Acre based on $0.52/lb +/- premium/discounts. Samples ginned at the University of Tennessee’s West TN Research and Education Center and classed at the USDA Classing Office in Memphis, TN.

Footnotes

1.

This document is SS-AGR-373, one of a series of the Agronomy Department, UF/IFAS Extension. Original publication date January 2014. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Darcy E. P. Telenko, postdoctoral research associate, West Florida Research and Education Center, Milton, FL; and Michael Donahoe, county Extension director, Santa Rosa County Cooperative Extension, Milton, FL; UF/IFAS Extension, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.