Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in Florida 1

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1 SS-AGR-163 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in Florida 1 D. L. Wright, B. Kidd, P. J. Wiatrak, and J. J. Marois 2 Cotton has been a major row crop for Florida growers over the last several years. It has replaced corn and soybean as the main row crops grown across the northern part of the state and is widely used as a rotation crop with peanut. Varieties and production practices have changed much over the past few years due to biotechnology. Variety selection is one of the most important decisions that a grower can make and he has only one chance to make the right decision. Cultural Practices for the Short Season Cotton Variety Trial These studies were conducted on a Dothan sandy loam soil (fine loamy siliceous, thermic Plinthic Kandiudult) at the NFREC, Quincy Research Station. Cotton was planted strip-till on 23 April into previous year's cotton stubble with a cone planter at the seeding rate of 80 seeds/20 ft of row and 36 row spacing with Thimet 20 G applied in furrow at 5 lbs/a for thrips control. The same day the study was band-direct fertilized with (N-P 2 O) at 400 lbs/a. The variety trial was sprayed pre-emergence with herbicides 1 qt/a + 1 qt/a on 24 April and broadcast-sprayed with 2.9 oz/a for thrips control and 0.66 oz/a + 1 pt/100 gal water on 9 May. Cotton was sidedressed with (N-P 2 O) fertilizer at 176 lbs/a on 28 May and sprayed with 1 pt/a + 2 pt/a on 14 June and 8 July to control growth. The variety trial was direct-sprayed with Direx qt/a + Roundup Ultra 1.5 pts/a on 24 June, broadcast-sprayed with 2 oz/a pts/a on 11 July for insect control, 0.5 pt/a + 2 pts/a on 23 July, and 2.56 oz/a pt/a on 31 July. On 17 September cotton was defoliated with 2 qt/a + 6 oz/a qts/a. The variety trial was picked with the International Cotton Spindle Picker on 11 October. Cultural Practices for the Mid and Full Season Cotton Variety Trial Cotton was planted at the seeding rate of 80 seeds/20 ft of row and 36 row spacing with Thimet 20 G applied in furrow at 5 lbs/a on 17 April. The same day cotton was band-direct fertilized with (N-P 2 O) at 400 lbs/a. Cotton was 1. This document is SS-AGR-163, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Revised January, 2003.Visit the EDIS Web Site at 2. D. L. Wright, professor, Agronomy Department; B. Kidd, Senior Biological Scientist; P. J. Wiatrak, Assistant in; J. J. Marois, professor, Plant Pathology Department; North Florida Research and Education Center, Quincy FL. Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL The use of trade names in this publication is solely for the purpose of providing specific information. UF/IFAS does not guarantee or warranty the products named, and references to them in this publication does not signify our approval to the exclusion of other products of suitable composition. The Institute of Food and Agricultural Sciences is an equal opportunity/affirmative action employer authorized to provide research, educational information and other services only to individuals and institutions that function without regard to race, color, sex, age, handicap, or national origin. For information on obtaining other extension publications, contact your county Cooperative Extension Service office. Florida Cooperative Extension Service/Institute of Food and Agricultural Sciences/University of Florida/Christine Taylor Waddill, Dean.

2 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 2 broadcast-sprayed with herbicides 1 pt/a + Bueno 6 1 pt/a on 26 April. Due to poor emergence the trial was replanted on 15 May, broadcast-sprayed with 1 qt/a + qt/a on 16 May, and sprayed again with 1 qt/a + Bueno 1 pt/a on 10 June. Cotton was side-dressed with (N-P 2 O) fertilizer at 176 lbs/a on 17 June and sprayed with 1.2 oz/a + 1 qt/100 gal water on 27 June. The variety trial was sprayed with 1 pt/a + 2 pt/a on 15 July and with 0.5 pt/a + 2 pts/a on 23 July. On 5 and 19 August cotton was sprayed with the growth regulator 1 pt/a pts/a. The variety trial was broadcast-sprayed with 2 oz/a pts/a on 9 September and defoliated with 1.5 pts/a + 12 oz/a + 1 pt/a on 30 September. On 21 October cotton was picked with the International Cotton Spindle Picker. Cultural Practices for the Roundup Ready Variety Trial Cotton was planted at the seeding rate of 80 seeds/20 ft of row and 36 row spacing with Thimet 20 G applied in furrow at 5 lbs/a on 17 April. The next day cotton was band-direct fertilized with (N-P 2 O) at 400 lbs/a. Cotton was broadcast-sprayed with Roundup Ultra 1.5 pt/a on 26 April, 2.9 oz/a on 9 May, and Roundup Ultra 1 pt/a. Cotton was side-dressed with (N-P 2 O) fertilizer at 176 lbs/a on 28 May. On 10 June cotton was broadcast-sprayed with 0.66 oz/a + 1 qt/100 gal water. The variety trial was sprayed with 1 pt/a + 2 pts/a on 14 June, direct-sprayed with Roundup Ultra 1.5 pts/a on 19 June, broadcast-sprayed with 1 pt/a on 7 July, 2 oz/a pts/a on 11 July, 0.5 pt/a + 2 pts/a on 23 July, 2.56 oz/a pts/a on 31 July, and defoliated with 1.5 pt/a lb/a on 17 September. Cotton was picked with the International Cotton Spindle Picker on 7-11 October. Tables 1, 2, 3, 4, and 5 shows the emergence, seed + lint and lint s, percent lint, and lint characteristics of the 2002 trials. Data from several locations and years should be used to determine best varieties and consistency of over varying weather conditions encountered each year. Key management Considerations for Cotton Production 1. Variety selection - variety trials compare many factors such as s and lint quality under management at each location. 2. Conservation tillage - Strip - till planting decreases erosion, increases soil organic matter, soil moisture, and improves soil texture and may result in increased s. Cover crops should be killed 3 to 4 weeks prior to planting to reduce insect and moisture deficit problems. 3. Planting dates plantings made from April to mid-june when soil temperature is adequate for germination will result in good s in most years. 4. Plant populations desired cotton plant population is 2-3 plants per foot of row. To get this population, plant 4-5 seeds per foot of row. 5. Adequate and timely N fertilization both insufficient and excess nitrogen can lead to fruit shed or boll rot. Nitrogen should be applied near the row, early in the season at first squaring. Two applications may be made on sandy soils (at squaring and 3 weeks later). The recommended rate of nitrogen ranges from 50 to 90 lbs N/A. 6. Weed control effective weed control is one of many critical components of successful cotton production. Weeds must be controlled early for best s and lowest cost. 7. Insect control effective scouting with timely and proper insect management to control bollworms, budworms, and stinkbugs is very important. 8. Timely defoliation and harvest if the defoliant application is delayed until 60 percent of the bolls are open, most of the crop should be ready to harvest within two weeks after application.

3 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 3 Table 1. Early Season Cotton Variety Trial: NFREC, Quincy, FL Brand Hybrid Emergence Seed + lint cotton Lint cotton DP 555 BG/RR * Delta and 4 Delta and SG 215 BG/RR Sure-Grow DPLx00S13 BR DPLx99x Sure-Grow 521 R Sure-Grow 501 BR DP 451 B/RR DP 436 RR Aventis FM 958 B Aventis FM Aventis FM Mean NS NS NS 1.08 *Delta and DPLx00S13 BR has a new name: DP 444 BG/RR. Table 2. Early Season Cotton Variety Trial: NFREC, Quincy FL (cont.) 1 Aventis FM Aventis FM Aventis FM 958 B Delta and 8* Delta and DP 436 RR DP 451 B/RR DP 555 BG/RR DPLx99x DPLx00S13 BR Sure-Grow

4 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 4 Table 2. Early Season Cotton Variety Trial: NFREC, Quincy FL (cont.) SG 215 BG/RR Sure-Grow 501 BR Sure-Grow 521 R Mean NS NS NS 5.95 *Delta and DPLx00S13 BR has a new name: DP 444 BG/RR Table 3. Mid and Full Season Cotton Variety Trial: NFREC, Quincy, FL. Brand Hybrid Emergence Pine 18 Delta and Pine Pine Pine Seed + lint cotton Lint cotton DP 555 BG/RR Delta PEARL DP 458 B/RR DP 545 BG/RR Stoneville ST 4892 BR Pine DP Stoneville ST Delta and Pine DP Aventis FM 989 R Stoneville ST 4793 R Stoneville ST 5599 BR Pine DP 448 B Aventis FM 989 BR Pine 1 Pine DP 449 BG/RR NuCOTN 35 B Aventis FM 991 R Pine NuCOTN 33 B

5 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 5 Table 3. Mid and Full Season Cotton Variety Trial: NFREC, Quincy, FL. Brand Hybrid Emergence Seed + lint cotton Lint cotton 23 Stoneville STx0003 RR Delta and Pine DP Pine DP 655 B/RR Delta and Pine Pine DP 5690 RR DP 5415 RR Aventis FM Mean NS Table 4. Mid and Full Season Cotton Variety Trial: NFREC Quincy, FL. (cont.) 1 Aventis FM 989 BR Aventis FM 989 R Aventis FM 991 R Aventis FM Delta and DP 448 B DP 449 BG/RR DP 458 B/RR DP DP DP 5415 RR DP 545 BG/RR DP 555 BG/RR

6 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 6 Table 4. Mid and Full Season Cotton Variety Trial: NFREC Quincy, FL. (cont.) 13 Delta and DP Delta and Delta and DP 5690 RR DP 655 B/RR NuCOTN 33 B NuCOTN 35 B Delta PEARL Stoneville ST 4892 BR Stoneville ST 4793 R Stoneville ST 5599 BR Stoneville ST Stoneville STx0003 RR Mean NS NS NS NS NS Table 5. Roundup Ready Cotton Variety Trial: NFREC Quincy, FL. Brand Hybrid Seed + lint cotton 8 Delta and Lint cotton DP 555 BG/RR Aventis FM 991 R Stoneville ST 4892 BR Delta and 1 1 SG 215 BG/RR Sure-Grow 521 R DP 545 BG/RR DP 458 B/RR Sure-Grow 501 BR

7 Results of 2002 Early, Mid, and Full Season and Roundup Ready Cotton Variety Tests in... 7 Table 5. Roundup Ready Cotton Variety Trial: NFREC Quincy, FL. Brand Hybrid Seed + lint cotton Lint cotton 18 Stoneville ST 4793 R * Delta and DP 451 B/RR DP 655 B/RR DP 5690 RR DP 5415 RR DPLx 00S13 BR Stoneville ST 5599 BR Aventis FM 989 R Stoneville ST x 0003 RR Delta and DP 449 BG/RR DP 436 RR Aventis FM 989 BR Mean *Delta and DPLxOOS13 BR has a new name: DP 444 BG/RR.