• Estimated Use of Plant Nutrients in Arizona, by Crops

      Pawson, W. W.; Stanberry, C. O.; Fuller, W. H.; Tucker, T. C.; Pew, W. D.; Hillman, J. S. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Mechanical Harvesting of Lettuce

      Harriott, B. L. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Research work aimed at developing a selective mechanical harvester for crisphead lettuce was initiated in 1961. During the course of the project, two experimental machines were constructed. Commercial development of the harvester was assumed by Lockwood Grader Corporation in 1964 under terms of a contract between Lockwood and the Arizona Research Foundation. Lockwood is now in the process of constructing a four row prototype harvester that will be capable of harvesting 1.5 acres of lettuce per hour.
    • Vegetable Crops Extension Program

      College of Agriculture, University of Arizona (Tucson, AZ), 1965-08
    • Characteristics of Harvested Lettuce Heads

      Oebker, N. F.; Hariott, B. L.; Page, Carmy G.; Foerman, B. R.; Grounds, R. E. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      A study was made of the characteristics of harvested lettuce heads in Arizona during the 1964-65 season. Information on size, weight, firmness and number of wrapper leaves of each head sampled was collected and set up for analysis. No results were available at the time of this progress report.
    • Irrigation Practices with Potatoes

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Data from five years of experimentation with irrigation and soil moisture levels indicate that a certain knowledge and general understanding of these factors is important in potato production. Nine treatments ranging from a constant very wet level to a constant dry treatment were used. Yield differences were significant and varied from a low of 321 cwt, from plants exposed to a very wet (18-20 centibars tension) level early in the season followed by a dry (75-80 centibars tension) condition during the last part of the growing season, to 416 cwt where the plants were kept at a dry level early and changed to a very wet level late in the season. Growers often unknowingly reduce yields and lower quality by applying excessive amounts of irrigation water.
    • Irrigation Trials with Cabbage

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      The influences of soil moisture are pronounced in cabbage grown under Arizona's semiarid conditions. An understanding of these effects is a must if the most effective cabbage production is to be achieved. High, constant levels of moisture reduces solidity, increases apparent size, reduces color and general market acceptance. On the other hand, dry soil moisture conditions increases solidity and color and reduces size and generally impairs market quality because of the smallness of size and the tough and woody texture of the cabbage thus produced. Best quality cabbage commensurate with acceptable yields and greatest effectiveness is obtained where moisture is kept at 75-80 centibars of tension.
    • Response of Dry Onions to Varying Levels of Soil Moisture

      Pew, W. D. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Onions respond favorably to increasing levels of soil moisture as measured by increase in bulb size and total yields. Maintaining a soil moisture level of 18-20 centibars of tension (nearly field-holding capacity) produces the greatest yields of bulbs. However, dry onions so produced are somewhat softer in texture, tended toward thick -neck growth, matured slower, and are more difficult to cure adequately in the normal length of time. Onions grown on lesser amounts of water tend to have the reverse characteristics. Costs of production are similarly increased under high soil moisture levels because of the need for replacing nitrogen leached out of the root zone. Also, the costs of the water and its application must be increased. Therefore, the economics involved would be a required consideration.
    • Teaching Program in Vegetable Crops

      Fazio, Steve (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Bacterial Soft-Rot of Vegetables

      Stone, William J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      A highly virulent bacterial isolate was obtained from Arizona vegetables. Pathogenicity and physiological studies were made in an effort to correctly identify the isolate.
    • Verticillium Wilt of Potato

      Stone, William J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Isolates of Verticillium Albo-atrum were obtained from potato and from cotton. Investigations are in process to ascertain the relationship between cotton Verticillium wilt and potato Verticillium wilt and to determine the significance of the disease to Arizona potato production.
    • Labor Requirements for Vegetable Crops in Arizona

      Pawson, Walter (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Cantaloup Harvest Aids

      Larsen, W. E. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Cucurbita Research

      Bemis, W. P. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Studies on Fall Production Problems with Irish Potatoes in Arizona

      Bessey, Paul M. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Effects of Treatments on the Postharvest Senescence of Green Leaves

      Bessey, Paul M. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Effect of Fertilizers on Yield, Quality and Nutrient Uptake by Lettuce

      Strohlein, J. L.; Tucker, T. C. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      A series of studies on lettuce fertilization have been carried out over the past few years. Fertilizer applications increased yield through increased head size and did not affect the number or quality of harvested heads. The lower rates used were as effective as the higher rates. Nitrogen and phosphorus fertilization generally increased the nitrate and phosphorus content of the various plant parts selected for analysis.
    • Fertilizer Placement in Potato Production

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      The importance of proper fertilizer placement has been demonstrated in recent greenhouse studies. Small, seemingly unimportant changes in fertilizer placement often in reality are very important. Specially constructed boxes with glass fronts were used to study root development as affected by fertilizer placement. Yields were significantly different one from another with the poorer ones resulting where fertilizers were placed too close to the seed piece. Yields ranging from 298 cwt, where the fertilizer was placed two inches to each side and level with the seed piece; up to 367 cwt where the fertilizer was placed four inches to each side and two inches below the seed piece. Root burning and speed of root regeneration represent the most important consideration to be reckoned within the proper placement of fertilizer.
    • Arizona Potato Variety Trials, 1961-1964

      Oebker, N. F.; Bessey, P. M. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      In potato variety trials in Central Arizona, Kennebec and Merrimack performed the best as potatoes for chipping. Red varieties Viking, LaRouge, and Red LaSoda yielded about the same as Red Pontiac, the standard for the area; however, Viking had much better appearance and uniformity than the other three reds.
    • Potato Fertilization

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Results from experiments with varying levels of nitrogen, phosphorus and potassium have shown that the ratios of 1 - 2.5 - 0 to 1 - 3 - 0 produce the highest yields. While the ratio between nitrogen and phosphorus appears important, the water solubility of the phosphorus seems to be the most important factor in proper fertilization. Proper placement of the fertilizer as well as irrigation and other cultural practices are musts in potato production.