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PAGE 1 SSAGR33 2005 Cotton Variety Trials in Florida: EarlyMaturing Cultivars1 D. L. Wright, C. A. Smith, and E. B. Baxley2 1. This document is SSAGR33, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date April 2006. Visit the EDIS Web Site at http://edis.ifas.ufl.edu. 2. D. L. Wright, professor, Agronomy Department, North Florida Research and Education CenterQuincy, FL; C. A. Smith, former regional IPM agent, Jackson County, FL; E. B. Baxley, OPS Weed Scientist, North Florida Research and Education CenterQuincy, FL; Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611. 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 (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with nondiscrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Larry Arrington, Dean Early Season Cotton Variety Trial Cotton variety trials were planted in conventional tilled soil with a cone planter at the seeding rate of 80 seeds/ 25 linear feet of row with 36 row spacing on May 18, 2005. Twenty nine early season cotton varieties were planted. This followed a bedded application of 10N 28P 87K that was applied on March 21. The following is a summary of how the plots were managed throughout the 2005 growing season: 32105 Bedded 10N 28P 87K 51805 Planted 52305 PRE Application Prowl 1.5pt, Cotoran 1.5 pt, Glyphomax 2 qt, Staple 8 oz, Orthene 4oz 62705 200# 3728 50# Kmag 50# MOP (30 units) 70# N in irrigation 62905 0.1oz Acre Envoke 71505 70# N in irrigation. 72005 4oz Bidrin 1# Solubor 10oz Pix 72705 1qt Caparol 1qt MSMA 81305 16oz Pix 4oz Bidrin 4oz Ammo 2# 202020 102505 Harvest Cotton plots were harvested on October 25, 2005. These were spindle picked by a Case International 1822 two row cotton harvester. Management Considerations for Maximum Yields 1. Choosing the right variety: In 2005 there were 69 varieties; this is a lot of varieties to choose from. Special considerations should be made in regards to desired traits and your own farm. When making variety selections consider results from various locations from multiple years of PAGE 2 2005 Cotton Variety Trials in Florida: EarlyMaturing Cultivars 2 University trials, and look for consistent performers. 2. Conservation Tillage: StripTill planting decreases erosion, increases soil organic matter, soil moisture, and improves soil texture which in turn may lead to increased yields. Cover crops should be killed 3 to 4 weeks prior to planting to reduce insect problems and prevent soil moisture depletion. 3. Planting dates: Optimum planting ranges from April 20 to May 20. Consider planting early and midfull season varieties at the same time in order to stagger harvest dates. 4. Target Plant Population: Desired plant population is 23 plants per foot. In order to achieve this plant 34 seed per foot. 5. 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 on most soils. 6. Weed control: Early season weed control is critical no matter what technology that you decide to use, and has proven to increase yields. Newer varieties that allow over the top herbicide applications all season long proved themselves as top yielders but still need to be treated for early season weeds, if applications are delayed until thresholds are maximized, the technology proves to be no advantage. 7. Insect Control: Effective scouting should be implemented with timely and proper insect management of bollworms, armyworms, and stinkbugs is critical. 8. Timely defoliation and harvest: If the defoliation is delayed until 6065% of the total crop to be harvested is open, 90% of the crop can likely be harvested within two weeks after the application. Results Table 1 shows the harvest and the HVI data for the 2005 early season cotton varieties. PAGE 3 2005 Cotton Variety Trials in Florida: EarlyMaturing Cultivars 3 Table 1. Harvest and the HVI data for the 2005 early season cotton varieties Description Seed Cotton Lint Turnout Color Grade Leaf Grade Ext. Matter Mike Length Staple Strength Uniformity HVI Trash Rating Unit Brand Name Lbs/Acre Lbs/Acre Delta & Pine DP 445 BG/RR 2842 a 1137 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 29 a 84 a 2 a Phytogen PHY 485 WRF 2812 a 1092 a 0 a 51 a 8 a 11 a 5 a 1 a 37 a 29 a 83 a 2 a Stoneville ST 5242 BR 2680 a 1086 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 30 a 82 a 2 a Delta & Pine DPLX 04Z600 DF 2713 a 1068 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Stoneville STX 4664 RF 2535 a 1062 a 0 a 54 a 8 a 11 a 5 a 1 a 36 a 29 a 83 a 2 a FiberMax FMX 1003 B2LL 2645 a 1039 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Phytogen PHY 475 WRF 2592 a 1022 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 32 a 82 a 3 a FiberMax FM 960 B2R 2534 a 1016 a 0 a 49 a 7 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Phytogen PHY 370 WR 2321 a 960 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Stoneville ST 4686 R 2362 a 956 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 30 a 83 a 2 a Delta & Pine DP 444 BG/RR 2413 a 955 a 0 a 49 a 8 a 11 a 4 a 1 a 37 a 30 a 83 a 2 a Delta & Pine DPLX 03X179 R 2358 a 954 a 0 a 49 a 8 a 11 a 4 a 1 a 36 a 31 a 83 a 1 a Stoneville ST 4575 BR 2398 a 953 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 30 a 82 a 2 a Delta & Pine DP 432 RR 2313 a 923 a 0 a 54 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 3 a Stoneville STX 4554 B2F 2279 a 917 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Delta & Pine DP 454 BG/RR 2194 a 886 a 0 a 51 a 8 a 11 a 4 a 1 a 36 a 31 a 82 a 3 a PAGE 4 2005 Cotton Variety Trials in Florida: EarlyMaturing Cultivars 4 Table 1. Harvest and the HVI data for the 2005 early season cotton varieties Description Seed Cotton Lint Turnout Color Grade Leaf Grade Ext. Matter Mike Length Staple Strength Uniformity HVI Trash Rating Unit Brand Name Lbs/Acre Lbs/Acre Phytogen PHY 310 R 2113 a 871 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 3 a Delta & Pine DPLX 04Z503 DF 2093 a 857 a 0 a 49 a 8 a 11 a 4 a 1 a 37 a 31 a 82 a 2 a FiberMax FMX 0222 B2LL 2163 a 855 a 0 a 46 a 8 a 11 a 4 a 1 a 37 a 32 a 82 a 2 a FiberMax FM 989 B2R 2102 a 851 a 0 a 51 a 8 a 11 a 4 a 1 a 38 a 30 a 83 a 2 a Delta & Pine DP 424 BGII/RR 2195 a 846 a 0 a 54 a 7 a 11 a 4 a 1 a 37 a 29 a 82 a 2 a Delta & Pine DPLX 04Z602 F 2090 a 843 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Delta & Pine DPLX 04Z603 F 2093 a 842 a 0 a 51 a 8 a 11 a 5 a 1 a 37 a 31 a 82 a 2 a FiberMax FMX 9166 B2LL 2095 a 829 a 0 a 49 a 8 a 11 a 4 a 1 a 37 a 31 a 82 a 2 a Delta & Pine DP 434 RR 2037 a 805 a 0 a 51 a 8 a 11 a 4 a 1 a 37 a 31 a 83 a 2 a Phytogen PHY 425 WR 2047 a 805 a 0 a 54 a 8 a 11 a 4 a 1 a 37 a 30 a 83 a 2 a Delta & Pine DPLX 04Y170 BR 1926 a 781 a 0 a 54 a 8 a 11 a 4 a 1 a 37 a 30 a 83 a 3 a Delta & Pine DP 455 BG/RR 1940 a 780 a 0 a 54 a 8 a 11 a 4 a 1 a 37 a 31 a 82 a 3 a Phytogen PHY 415 WR 1914 a 763 a 0 a 54 a 8 a 11 a 5 a 1 a 37 a 29 a 83 a 3 a LSD (P=.05) 661.4 269.9 0 4.9 0.8 0 0.4 0 0.9 2.6 1.2 1.1 