• Bread Wheat, Barley and Durum Wheat Evaluated for Double Cropping with Cotton at the University of Arizona Maricopa Agricultural Center in 1986

      Thompson, Rex; Bobula, Jamie; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Alfalfa Variety Trial at the Riggins Farm in Chandler, AZ, 1984-1986

      Dawson, Lester; Parsons, David; Ottman, Michael; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Small Grain Variety Comparisons at the Maricopa Agricultural Center in 1986

      Thompson, Rex; Bobula, Jamie; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Response of Guar to Fertilizer Applications

      Stroehlein, Jack; Kebler, Karen; Forrest, Paul; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      Fertilizer studies were carried out with guar in the field and greenhouse over two seasons. Response to N was found in terms of plant growth and bean yield. With very low available soil P, fertilizer P increased the P concentration in guar plants but not bean yields. Zinc increased yields in the greenhouse only on the soil with the lowest available Zn.
    • Nutrient Composition of Large Leaflet Alfalfa

      Dobrenz, Albert; Whiting, Frank; Brown, Bill; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      A large leaflet alfalfa was developed with five cycles of recurrent selection. This new germplasm was compared to the original population 'Hayden' for nutrient composition. Crude protein, lignin, cell solubles, hemicellulose and neutral detergent fiber were not significantly different among the cycles and the original population of alfalfa at the June and July harvests. Ether extract (lipid) did drop considerably in plants of the first two cycles, but was not different in plants from Hayden in cycle five at the first harvest. Selection for large leaflets has not significantly changed the nutrient composition components after five cycles of recurrent selection.
    • How the 1986 Cotton and Dairy Programs Affect Alfalfa Hay Prices and Incomes

      Blank, Steve; Ayer, Harry; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      The 1986 Upland cotton program encourages alfalfa production, while the 1986 dairy program reduced the size of Arizona's dairy herd. The increased supply of and decreased demand for alfalfa depress alfalfa prices. Our estimates indicate cotton and dairy programs may reduce alfalfa prices and incomes by about 10 percent.
    • The Relative Influences of Moisture and Nitrogen Fertilizer on Sorghum Development for Grain and Forage Production under Double Cropping

      Refay, Yahya; Voigt, Robert; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      Three high yielding and three low yielding grain sorghum hybrids were grown for grain yield and total dry weight in late planted simulated double-crop after barley or wheat harvest with two levels of irrigation (dry and wet) and two levels of nitrogen fertilizer (0 and 100 lbs/acre). The experiment was conducted on the University of Arizona Marana Agricultural Center. Nitrogen fertilizer and the interaction between nitrogen fertilizer and water irrigation had no significant effect on the grain yield of sorghum hybrids. Additional nitrogen fertilizer applied under dry conditions reduced both grain and total dry matter production, and when applied under wet conditions produced gains in grain or dry matter production of only 1% to 4% for the high and low yielding groups. Additional irrigation water produced 61% to 77% additional grain under low and high fertilizer levels for high and low yielding sorghum groups. Additional irrigation water produced 8% to 38% more plant dry matter under low and high fertilizer levels.
    • The Stateus of Stem Nematodes in Arizona Alfalfa in 1985-86

      Nigh, Edward Jr.; Dawson, Lester; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      Alfalfa stem nematodes have become a more serious pest since the advent of non -dormant alfalfa. Their distribution has increased and their period of feeding activity has been prolonged. A state survey has been conducted to determine the presence of the nematode in the principal alfalfa- growing areas of the state. The population dynamics were followed during the 1985-86 growing season. Alfalfa samples, including stems and crowns, were taken from selected fields in each geographic area and the nematodes were extracted. Populations from the samples determined the fields infested and the periods of feeding and reproduction. More than one -half of the fields sampled in the Salt River Valley were infested with the nematode and new infestations were found in Yuma County. Warm weather from October through the winter permitted nematode activity, causing serious stand decline. This pest is becoming more widely distributed and more economically important to alfalfa growers in Arizona.
    • Barley Culivars Compared Under an Irrigation Water Gradient

      Ottman, Mike; Ramage, Tom; Thacker, Gary; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      The relative ability of barley cultivars to perform outside the environment for which they were selected is not fully known. This study was initiated at Marana in 1985-86 to compare barley cultivars, which were adapted to different input levels, under a line-source sprinkler system that delivered a gradient of water. Higher than average rainfall in February and March provided ample moisture for crop growth, prevented very low water levels and led to the water gradient being applied late in the season when most of the cultivars were in the grain fill stage. We determined that cultivars bred for high level management (Gustoe and Barcott) performed best at the high water levels. Suitable cultivars for minimal water could not be determined since truly low water levels were never attained. Harvest index, the proportion of grain to total plant yield, was greatest for Gustoe at the high water level, but no differences were detected at the low water level. We suspect that one-irrigation barleys, bred to produce grain with a single preplant irrigation, effectively recover water with a deep root system and do not necessarily use less water than other barley cultivars.
    • Break-even Analysis of Durum Wheat Varieties: Price vs. Yield

      Wade, James; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Yield Requirements of Non-Premium Durum Wheat

      Farr, Chuck; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Wheat and Barley Variety Demonstration - 1986 - TLM Farms - Yuma, AZ

      Tickes, Barry; Ottman, Mike; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      On farm variety demonstrations are conducted by the Cooperative Extension Service to demonstrate the commercial potential of new and established varieties of wheat and barley when grown under various environmental and management conditions. As part of an ongoing variety demonstration program conducted in Yuma County, Arizona for the past 20 years, this study was conducted at TLM Farms on the south Yuma Mesa on extremely coarse-textured sandy soils under sprinkler irrigation. Five hard red spring wheat, six durum and four barley varieties were evaluated under TLM Farms management using 13 ft x 275 ft randomized plots with four replications. Statistically significant yield differences were measured that suggest, when compared to previous and other studies, that variety performance on coarse textured, sprinkler-irrigated soils is different than on finer textured flood-irrigated soils.
    • Effects of Dried Sewage Slude on Barley Grain Production

      Day, Arden; Thompson, Rex; Swingle, Spencer; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      A four-year experiment was conducted at the Mesa Agricultural Center to study the use of dried sewage sludge from the City of Phoenix as a source of plant nutrients in the commercial production of barley grain. The objective was to compare the effects of sewage sludge and commercial fertilizer on barley growth, grain yield, and quality. Three fertilizer treatments were used: (1) suggested rates of nitrogen (N), phosphorus (P), and potassium (K) in Arizona, (2) dried sewage sludge to supply plant-available N in amounts equal to the suggested rate, and (3) N, P, and K from inorganic fertilizers in amounts equal to those in sewage sludge. Characteristics of barley growth, grain yield, and quality were similar for the three fertilizer treatments. Barley can utilize the fertilizer nutrients in dried sewage sludge in the production of grain as effectively as it can utilize the fertilizer nutrients in inorganic fertilizer.
    • Stomate Distribution of Three Pearl Millet Genotypes

      Teowolde, Haile; Osman, Mohamoud; Voigt, Robert; Dobrenz, Albert; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Comparison of Preservatives of Alfalfa Hay

      Alhadhrami, Ghaleb Ali, 1954-; Harper, John; Huber, Tal; Higgenbotham, Gerry; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Wheat and Barley Variety Demonstrations, Mohave Valley Farms, Mohave Valley, AZ - 1986

      Grumbles, Robin; Sherrill, Chip; Winans, Sherwood; Ottman, Mike; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Alfalfa Variety Demonstration Safford Agricultural Center, 1985

      Cluff, Ronald, E.; Parsons, David; Thatcher, Max; Clark, Lee; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
    • Wheat and Barley Variety Demonstrations, Bruce Church Range, Poston, AZ - 1986

      Winans, Sherwood; Tickes, Barry; Ottman, Mike; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      A wheat and barley demonstration on the Bruce Church Farm, Poston, Arizona, harvested June 5, 1986, gave crop and variety performance differences under grower management conditions. The top yielding barley variety was Westbred Gustoe, 6190 lbs /acre. The leading durum varieties were Turbo and Yavaros, 7280 and 7220 lbs/acre, respectively. Durum Wheat Westbred 881 was highest in protein (15.6 %) and lowest in percentage of yellowberry. In the bread wheat varieties, yields ranged from 6740 to 6570 lbs per acre. Varieties tested were Yecora Rojo, Probred, Probrand 775, and Westbred 911, with no significant differences in yield between varieties. Yecora Rojo was highest in protein (15.8 %). While these are the results of one year, continued testing over several years is necessary to assess variety performance under grower management conditions.
    • Soil Test Calibration for P, K. Mg, and Zn in the Production of Durum Wheat

      Doerge, Thomas; Ottman, Mike; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      Additional data to calibrate and refine current guidelines for interpreting soil test values is an ongoing need in Arizona. This includes information for soils testing above and below the level that may currently be considered adequate for optimum plant growth. An experiment was conducted at the Maricopa Agricultural Center during the 1985-86 crop year to evaluate the response of durum wheat to the application of phosphorus (P), potassium (K), magnesium (Mg), or zinc (Zn) on a soil testing adequate or higher for all of these nutrients. Grain yields from plots receiving every combination of three of the four nutrients were compared to yields obtained when all four nutrients were applied. No significant change in grain yield was measured as a result of witholding any one of the nutrients. Current guidelines used to interpret soil test results for wheat production correctly predicted the nutrient status of this soil with respect to P, K, Mg, and Zn.
    • Comparison of Irrigation Scheduling Methods on Wheat

      Biggs, Niel; Clark, Lee; Ottman, Mike (College of Agriculture, University of Arizona (Tucson, AZ), 1986-09)
      Several improved irrigation scheduling methods are available to farmers to reduce the amount of water used while not reducing crop yield. Each scheduling method has its own advantages and disadvantages. Because of the disadvantages, farmers have been slow in adopting some of the newer irrigation scheduling methods. This study compares two improved scheduling methods, the neutron hydro probe and a simplified bookkeeping method using a personal computer, with the irrigation practices normally used by a farm manager to grow wheat. In addition to the traditional parameters of applied water and yield, the time and difficulty associated with each method were evaluated.