1,721,186 research outputs found
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2006 Upland Cotton Variety Evaluations in Southeastern Arizona
No full textTwo separate Upland cotton variety evaluations were conducted in southeastern Arizona during the 2006 cotton growing season. One location was in Graham County (Thatcher), while the second location was in Cochise County (Kansas Settlement). Sixteen varieties were planted at the Thatcher and ten varieties were selected and planted at the Kansas Settlement location. Varieties ranged in maturity from early to full at each of the locations. All plots were arranged in a randomized complete block design with four replications. Both locations were planted on grower-cooperator fields and were managed in accordance to the individual grower styles. Plant measurements were collected over the course of the season at only the Thatcher location. Lint yield was determined by harvesting the entire plot at each location and weighing the resultant seedcotton. Sub-samples were collected also at the time of harvest for percent lint estimates and fiber quality analysis. Crop value was calculated multiplying the lint yield by a lint price determined by a base value of $0.52/lb plus any discounts or premiums based upon fiber quality. Lint yield levels at both locations were high ranging from 1200 to just over 1900 lbs. lint/acre with a new Acala variety from Phytogen (PHY745WRF) producing the highest yield and also the highest crop value at the Thatcher location. In Kansas Settlement lint yields ranged from 1000 to over 1500 lbs. lint/acre with the highest lint yield and total crop value being produced again by the new Acala variety from Phytogen (PHY745WRF)
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Residual Soil Nitrogen Evaluations In Irrigated Cotton, 2006
No full textField experiments have been conducted for the past 19 seasons at three Arizona locations on University of Arizona Agricultural Centers (Maricopa, MAC; Marana, MAR; and Safford, SAC. aimed at investigating nitrogen (N) fertilizer management in irrigated cotton (Gossypium spp.) production. The MAC and SAC experiments have been conducted each season since 1989 and the Marana site was initiated in 1994. The original purposes of the experiments were to test N fertilization strategies and to validate and refine N fertilization recommendations for Upland (G. hirsutum L.) and American Pima (G. barbadense L.) cotton. The experiments have each utilized N management tools such as pre-season soil tests for NO₃⁻-N, in-season plant tissue testing (petioles) for N fertility status, and crop monitoring to ascertain crop fruiting patterns and crop N needs. At each location, treatments ranged from a conservative to a more aggressive approach of N management. The integrity of the experimental sites at each location was maintained in each consecutive season. Results at each location revealed a strong relationship between the crop fruit retention levels and N needs for the crop. This pattern was further reflected in final yield analysis as a response to the N fertilization regimes used. The higher, more aggressive N application regimes did not consistently benefit yields at any location. Generally, the more conservative, feedback approach to N management provided optimum yields at all locations. In 2001, a transition project evaluating the residual N effects associated with each treatment regime was initiated and no fertilizer N was applied. From 2001 to 2005 the residual N studies were conducted at two of these locations (MAC and MAR). In 2006, the residual N study was conducted only at MAC (the University of Arizona ceased operations at MAR at the end of the 2005 season). Therefore, all N taken-up by the crop was assumed to be derived from residual soil N. However irrigation water analysis showed that NO₃⁻-N concentration levels added to the crop ranged from about 5 to 15 ppm. In 2001- 2005 there were no significant differences among the original fertilizer N regimes in terms of residual soil NO₃⁻-N concentrations, crop growth, development, lint yield, or fiber properties. In 2006 however, significant differences in lint yield among N fertilization regimes for the Maricopa location were found. This suggests a possible pattern associated with the residual fertilizer N effects in relation to the original treatments at the Maricopa site
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Quantifying Weekly Beef Production using Monthly Feeder Cattle Placements
No full textBeginning in December 1995, USDA/NASS started reporting monthly cattle-on-feed placements for four different weight groups, to provide information regarding future slaughter numbers and beef production. The focus of this thesis is to empirically quantify relationships between monthly placements of steers and heifers into the feedlot with weekly federally inspected fed beef slaughtered. Weight of feeders when placed in the feedlot, average daily gain, quality premiums, seasonality, and other factors are used to quantify relationships between feeder placements and slaughter numbers. A comparison of the forecasting accuracy of alternative seasonal adjustment approaches is carried out in this thesis to evaluate how to best capture seasonal effects on beef production. This study will improve understanding of the cattle feeding timeline and weight gain relationships between feedlot placements, economic incentives of cattle feeding, and federally inspected fed cattle
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2006 Arizona Cotton Growers Association Breeding Program Advanced and Preliminary Strain Testing Program
No full textA series of experiments were conducted across two locations in Arizona to evaluate 32 advanced and preliminary strains from the Arizona Cotton Growers Breeding Program. These trials were conducted in Yuma, AZ (130 ft. above MSL) and Maricopa, AZ (1170 ft. above MSL). Strains were planted in four row plots extending 38 feet in a randomized complete block design with a minimum of four replications. Each location had three commercial cotton varieties included as control treatments for comparison. Data collected on these trials included a series of plant measurements at three growth stages over the course of the season and yield and fiber quality data. All data were subjected to statistical analysis to test for differences among strains for yield and fiber quality. Both locations produced high yields despite high levels of heat stress in the lower deserts. Statistically significant differences were observed in yield and all fiber quality parameters at each location. Yield was down in Yuma as compared to previous years ranging from 1100 to 1800 lbs lint/acre. Yield at Maricopa was up significantly from last year with yields ranging from 1400 to 2100 lbs lint/acre. Significant increases in staple length was observed with several ACGA lines over control varieties at both locations with one line in particular producing a staple length of nearly 40 (ACGA 107). Several ACGA lines possess excellent fiber quality and performed well in terms of yield at both locations
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2006 Arizona Upland Cotton Advanced Strain Testing Program
No full textA series of experiments were conducted across three locations in Arizona to evaluate over 40 commercial cotton strains during the 2006 cotton growing season. These trials were conducted in Yuma, AZ (130 ft. above MSL); Maricopa, AZ (1170 ft. above MSL); and Safford, AZ (2900 ft. above MSL). Strains were planted in four row plots extending 38 feet in a randomized complete block design with a minimum of four replications. Each location had three commercial cotton varieties included as control treatments for comparison. Data collected on these trials included a series of plant measurements at three growth stages over the course of the season, yield and fiber quality data. All data were subjected to statistical analysis to test for differences among strains for yield and fiber quality. All three locations produced high yields despite high levels of heat stress in the lower deserts. Statistically significant differences were observed in yield and all fiber quality parameters at each location. Several lines performed considerably better than the commercial control varieties in terms of both yield and fiber quality indicating that continued progress is being made in developing new varieties that perform well in the varied cotton producing regions of Arizona
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