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Williamson
County
Result Demonstration Report 
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Williamson County Roundup Ready Cotton Variety Demonstration
Cooperator:
Jay Jaecks, Jr.
Dale A. Mott
EA-IPM
Ron Leps
Extension Agent-Agriculture
Rices Crossing, Williamson County, Precinct #4
SUMMARY: Twelve Roundup Ready Cotton Varieties were evaluated in a set of two trials on two fields farmed by Jay Jaecks Jr, at Rice's Crossing and Norman's Crossing. Average yields for the two locations ranged from 716 to 529 lbs per acre for FM 989BR and AP 4600RR, respectively. In addition, the average per acre loan value ranged from $305.50 to $211.76 for FM 989BR and AP 4600RR, respectively.
OBJECTIVE: Roundup Ready cotton varieties have been the predominant type of cotton grown in the Central Blacklands for the past few years. Therefore, the objective was to evaluate Roundup Ready cotton varieties for earliness, yield potential and fiber characteristics such as micronaire, fiber length, uniformity and fiber strength, all of which influence the market value of the crop.
MATERIALS & METHODS:
The demonstration was planted on April 16, 2001. The test was comprised of 12 Roundup Ready cotton varieties, planted at two different locations approximately 3 miles apart. One location, near Rice's Crossing (RC) is a field that has heavier clay soils in comparison to the field that was located near Norman's Crossing (NC), which has lighter textured soils. Each plot was 4 rows in width, row spacing was 38 inches. Each plot at the RC location was approximately 0.50 acres in area and each plot at the NC location was approximately 0.34 acres in area. Total fertility consisted of 60-20-0-8 lbs/acre. Roundup Ultra Max @ 20 oz/ac was applied 8 days before planting, over-the- top of the cotton on May 12, at the 3-4 true leaf stage, and with a hooded sprayer on June 20. Temik @ 4.5 lbs/acre was applied in furrow at-plant for early season insect control. The field was monitored weekly for insects. The field was sprayed on May 25 and 31 with Vydate CLV @ 9 oz/ac and Pix plus @ 1 oz/ac. The field was not treated again until the Boll Weevil Eradication Program began spraying the field in early August once per week with Malathion ULV @ 12 oz/ac.
Six plants were randomly selected from each treatment and were plant mapped on June 21 and July 23. Data collected included plant height, number of vegetative nodes along with mapping each fruiting position for square, green boll, open boll, or abscised fruit. The data was analyzed in PMAP Ver. 6.2.
Norman's Crossing. Cyclone Max @ 20 oz/ac was applied to the plots on August 16. The plots were harvested on September 13. During harvest, the entire plot was stripped with a 4-row JD 7445. The seed cotton was dumped into a weigh buggy before small samples were pulled which were ginned on small lab gins that produce an inflated turnout. The ginned samples were then sent to the International Textile Research Lab in Lubbock where each sample (plot) of cotton was classed. Lint turnout from the individual samples and weigh buggy data was used to determine a per acre yield for each variety. Turnout from the small gins can generally run 10% higher than a commercial gin.
Rice's Crossing. The cotton was treated with Ginstar @ 5 oz/ac and Dropp @ 0.0625 lbs/ac plus Dynamic @ 1 qt/100 gal water on August 16. Because of regrowth problems, the cotton was treated with Aim @ 0.67 oz/ac on September 15. The plots were harvested on September 18. The same harvest and ginning procedures used at the NC location were used at this location.
RESULTS AND DISCUSSION:
Table 1 presents average yield (lbs) per acre, mike, staple uniformity, strength, color grade and loan price/acre from each of the two replications (locations) of these treatments. The highest yielding Roundup Ready cotton variety from the study was FM 989B/RR which average 716 lbs/ac from the two sites. Yields ranged from 529 to 716 lbs/ac for AP 4600RR and FM 989B/RR, respectively. The mean yield for all varieties was 611 lbs/ac. Micronaire averaged 4.1 over both replications, with a range from 3.7 to 4.7. Staple ranged from 0.99 to 1.08, with a mean of 1.01. Uniformity, strength, and color grade averaged 80.1, 24.1 and 52, respectively.
The average per acre loan value for the treatments was $251.60. Average per acre loan value ranged from $211.76 for AP 4600RR to $305.50 for FM 989B/RR.
Table 1. Average Yield and fiber data and per acre loan value from two locations, for the Williamson county Cotton Variety Demonstration, Rice's Crossing and Norman's Crossing, TX 2001
| Variety | Yield lbs. Lint/Acre | Mike | Staple (in) | Unif. | Strength | Color | Loan Value/Acre |
| FM989BRR | 716 | 3.7 | 1.02 | 79.2 | 24.4 | 52 | $305.50 |
| AP 1500RR | 696 | 4.0 | 1.02 | 81.1 | 24.0 | 52 | $294.32 |
| ST 4892BR | 664 | 4.4 | 1.00 | 80.5 | 22.7 | 52 | $266.04 |
| SG 215BR | 648 | 4.0 | .99 | 79.9 | 23.7 | 52 | $260.25 |
| PM 1199RR | 626 | 4.5 | 1.04 | 80.6 | 24.5 | 52 | $263.47 |
| DP 420RR | 608 | 4.0 | 1.00 | 80.0 | 23.8 | 52 | $246.16 |
| DP 436RR | 606 | 4.1 | 1.08 | 79.7 | 24.8 | 52 | $260.68 |
| SG 521R | 571 | 4.2 | .99 | 81.6 | 24.3 | 52 | $231.34 |
| DP 422BR | 569 | 3.8 | 1.01 | 79.6 | 24.8 | 52 | $228.34 |
| ST 4793R | 549 | 4.7 | .99 | 80.3 | 23.2 | 52 | $219.69 |
| FM 989RR | 543 | 3.8 | 1.03 | 79.5 | 25.0 | 52 | $231.63 |
| AP 4600RR | 529 | 4.3 | .99 | 79.7 | 23.8 | 52 | $211.76 |
| MEAN | 611 | 4.1 | 1.01 | 80.1 | 24.1 | 52 | $251.60 |
Table 2 provides the per acre yield from the two locations of the trial. The varieties performed similar across both locations of the trial.
Table 2. Yield data for Rice's Crossing and Norman's Crossing locations of the Williamson County Cotton Variety Demonstration, TX 2001.
| Variety | Yield Lbs. Lint/Acre |
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| Rices Crossing | Norman's Crossing | |
| FM 989BRR | 731 | 700 |
| AP 1500RR | 670 | 721 |
| ST 4892BR | 626 | 701 |
| SG 215BR | 588 | 708 |
| PM 1199RR | 597 | 654 |
| DP 420RR | 621 | 595 |
| DP 436RR | 582 | 629 |
| SG 521R | 601 | 541 |
| DP 422BR | 566 | 571 |
| ST 4793R | 526 | 571 |
| FM 989RR | 533 | 552 |
| AP 4600RR | 545 | 512 |
| MEAN | 601 | 621 |
Tables 3 and 4 lists plant mapping information from the Rice's Crossing location for each variety in the trial for two dates, June 21 and July 23 . On June 21, the mean internode length, mean plant height, nodes above white bloom, mean reproductive nodes, mean squares per plant, and mean green bolls per plant for each variety was 1.5, 25.9, 0.5, 12.8, 10.3 and 0.0, respectively. Mean fruit retention was 65.6 and 45.8 for first and second positions, respectively. On July 23, the mean internode length, mean plant height, nodes above white bloom (NAWB), mean reproductive nodes, means squares per plant, and mean green bolls per plant for each variety was 2.1, 30.9, 2.1, 13.4, 0.9, and 7.5, respectively. Mean fruit retention was 56.3 and 21.0 for first and second positions, respectively.
Table 3. Plant Mapping Summary, Rices Crossing, TX June 21, 2001
| VARIETY | MEAN INTER LENGTH (inches) | MEAN PLANT HEIGHT (inches) | NAWB | MEAN REP NODES | MEAN SQUARE/PLANT | MEAN GREEN BOLLS/PLANT | FRUIT RETENTION BY POSITION | |
| 1st | 2nd | |||||||
| FM 989BRR | 1.6 | 26.0 | 0.0 | 12.7 | 11.7 | 0.0 | 64.2 | 57.5 |
| ST4793 | 1.5 | 28.8 | 0.0 | 14.0 | 12.3 | 0.0 | 56.7 | 45.8 |
| ST4892 | 1.6 | 25.6 | 0.0 | 11.3 | 8.3 | 0.0 | 58.7 | 45.7 |
| SV4892 | 1.6 | 25.6 | 0.0 | 11.3 | 8.3 | 0.0 | 58.7 | 45.7 |
| SV4793 | 1.5 | 28.8 | 0.0 | 14.0 | 12.3 | 0.0 | 56.7 | 45.8 |
| AP4600 | 1.5 | 28.8 | 0.0 | 13.3 | 11.7 | 0.0 | 67.3 | 50.0 |
| AP1500 | 1.4 | 24.3 | 0.0 | 13.0 | 11.2 | 0.0 | 71.2 | 40.0 |
| SG-521 | 1.5 | 25.7 | 0.0 | 11.8 | 8.8 | 0.0 | 63.8 | 40.0 |
| SG215 | 1.2 | 22.8 | 0.0 | 13.3 | 8.0 | 0.0 | 52.9 | 35.9 |
| PM1199 | 1.3 | 23.3 | 0.0 | 13.0 | 9.7 | 0.0 | 73.5 | 44.4 |
| FM989RR | 1.4 | 24.3 | 0.0 | 12.7 | 10.7 | 0.0 | 69.4 | 59.5 |
| DP436 | 1.5 | 26.3 | 0.0 | 12.8 | 12.3 | 0.0 | 90.0 | 50.0 |
| DP422 | 1.4 | 25.5 | 7.0 | 12.8 | 8.7 | 0.2 | 72.0 | 47.1 |
| DP420 | 1.4 | 26.8 | 0.0 | 13.8 | 10.2 | 0.0 | 63.2 | 33.3 |
| Mean | 1.5 | 25.9 | 0.5 | 12.8 | 10.3 | 0.0 | 65.6 | 45.8 |
Table 4. Plant Mapping Summary, Rices Crossing, TX July 23, 2001
| VARIETY | MEAN INTER LENGTH (inches) | MEAN PLANT HEIGHT (inches) | NAWB | MEAN REP NODES | MEAN SQUARE/PLANT | MEAN GREEN BOLLS/PLANT | FRUIT RETENTION BY POSITION | |
| 1st | 2nd | |||||||
| ST 4892 | 2.2 | 32.6 | 3.0 | 14.6 | 1.2 | 5.8 | 57.1 | 12.5 |
| ST 4793 | 1.9 | 26.3 | 3.0 | 14.0 | .5 | 7.0 | 58.6 | 16.3 |
| SG 521 | 2.2 | 33.7 | 2.0 | 15.2 | .5 | 8.3 | 52.3 | 19.3 |
| SG 215 | 2.2 | 32.7 | 3.0 | 2.8 | 2.8 | 6.0 | 41.8 | 21.4 |
| PM 1199 | 2.2 | 34.0 | 1.0 | 15.2 | 0.8 | 10.3 | 66.1 | 35.3 |
| FM 989BRR | 2.2 | 29.5 | 3.0 | 13.7 | 0.2 | 10.3 | 70.4 | 34.0 |
| DP 436 | 2.1 | 27.3 | 2.0 | 13.2 | 1.5 | 6.5 | 47.3 | 27.1 |
| FM 989 | 1.6 | 33.0 | 0.0 | 16.2 | 0.2 | 9.4 | 60.3 | 15.9 |
| DP 420 | 2.4 | 31.8 | 3.0 | 13.5 | 0.8 | 7.3 | 75.4 | 8.7 |
| DP 422 | 1.6 | 32.0 | 2.0 | 14.8 | 2.0 | 7.2 | 60.0 | 31.7 |
| AP 1500 | 2.4 | 32.7 | 0.0 | 13.5 | 0.3 | 5.7 | 49.1 | 11.1 |
| AP 4600 | 1.8 | 25.5 | 3.0 | 14.5 | 0.5 | 6.0 | 37.1 | 18.2 |
| Mean | 2.1 | 30.9 | 2.1 | 13.4 | 0.9 | 7.5 | 56.3 | 21.0 |
ACKNOWLEDGMENTS:
Appreciation is expressed to Mr. Jay Jaecks, Jr. for his work in putting in, maintaining, and harvesting these 2 sets of plots. Also, thanks goes out to the various seed companies that supplied varieties for this trial.
