Browsing Cotton Report 2005 by Subjects
Now showing items 1-4 of 4
2004 Arizona Cotton Growers Breeding Program Preliminary Strains Testing ProgramAn Upland Cotton Breeding Program was initiated in 2001 by the Arizona Cotton Growers Association (ACGA). Major objectives of the breeding program are to develop varieties that produce a superior fiber quality package, high yields, and under a wide range of environmental conditions. In 2004, the seed committee of the ACGA decided to begin an independent testing program in order to quantify the performance of chosen lines developed to date that were meeting the program’s goals. Forty one lines were chosen and evaluated in replicated small plots at two locations including Yuma and Maricopa, AZ. The final data was sorted according to lines that at both locations had a fiber micronaire of 4.9 or less, staple length of 37 or greater, strength of 30 g/tx or greater, a uniformity index of 80 or greater, and yielded in the top 25% of all tested materials. One line was identified according to this criteria, 0122-2033-304.
2004 Low Desert Upland Cotton Advanced Strains Testing ProgramUpland cotton advanced strains and commercial check varieties were evaluated in replicated field studies at three locations in 2004. The test sites include the AZ locations of Safford, Maricopa, and Yuma. Eight seed companies submitted a maximum of ten advanced strain entries per location. Three commercial check varieties were used at all three sites, and included ST5599BR, DP449BR, and DP448B. Data collected included final plant heights, yield, and fiber quality. The research is conducted in order to develop public unbiased performance data of genetic materials that have moved to the advanced stages of testing and are being considered for commercial release. The data have historically been used to add to seed company databases and assist with commercial release decisions.
Arizona Upland Cotton Variety Testing Program, 2004Each year the University of Arizona conducts variety trials across the state to evaluate the performance of upland cotton varieties. These tests provide unbiased data on the performance of varieties when tested side-by-side under typical production practices. In 2004 we planted a total of 11 trials, two in the Yuma region (Yuma County), two in the western region (LaPaz and Mohave counties), four in the central region (Maricopa and Pinal counties), one in the southern region (Pima county), and two in the eastern region (Graham and Cochise counties). We tested seven to eight commercially available varieties at each test site.
Upland Variety Testing Evaluation in Southeastern ArizonaTwo separate variety evaluations were conducted in southeastern Arizona during the 2004 cotton growing season. The two locations were on grower-cooperator fields in the Upper Gila River Valley located in Thatcher, AZ (Graham County) and in the Sulfur Springs Valley in Kansas Settlement, AZ (Cochise County). Twelve varieties were selected for the Graham County evaluation and fifteen in the Cochise County evaluation. These varieties included several transgenic varieties and ranged in maturity from early to full-season varieties. Several Acala varieties were also evaluated in both the Graham and Cochise County tests. Both evaluations were conducted using a randomized complete block design with each variety replicated four times. Plant measurements were collected in season on several dates from the Graham County evaluation. End of season plant measurements were collected from the Cochise County evaluation. Lint yield was estimated at each location by harvesting the entire plot and weighing the harvested seed cotton with a weigh wagon equipped with load cells. Sub samples were collected from each plot for fiber quality and percent lint determinations. Total crop value for each variety was calculated by using the fiber quality premium/discount and using a $0.52 per pound price. The total price is then multiplied by total lint yield to obtain the total value for that particular variety. Results observed in the Graham County evaluation were similar to those in 2003. Lint yield ranged from 1200 to over 1600 lbs. lint/acre. The FiberMax variety FM991BR produced the highest lint yield and also the highest total crop value at over $950/acre. Results from the Cochise County evaluation demonstrated the potential that high fiber quality can have on total crop value. Lint yields ranged from 600 to over 1200 lbs. lint/acre. The highest yielding variety (ST5242BR) did not produce the highest crop value. Because of the higher fiber quality of the Acala varieties, they produced the highest value at approximately $630/acre.