• Fertilizer Studies with Potatoes in the Queen Creek Area

      Turner, Fred Jr.; Pew, W. D. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      In a fertilizer study in the Queen Creek area, a strong response to nitrogen and phosphorus fertilizers was obtained. Potatoes did not respond to potassium when applied with nitrogen and phosphorus.
    • 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.
    • Sclerotiniose or Drop of Lettuce

      Stone, William J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Preliminary tests have been initiated in a program for control of Sclerotiniose, or drop of lettuce. Damping-off problems are concurrently being investigated.
    • 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.
    • Influence of Seed Piece Size on Potato Yields

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      During the past several years considerable experimenting has been aimed at developing methods for improving potato yields. One of the easiest and most effective ways found was to adjust the seed piece size and number of eyes per piece. Seed pieces were cut to meet the following size categories: 1/2, 1, 1-1/2, and 2 ounces and small whole tubers; 1-1/2, 2 and 2-3 ounces. Significant differences in yield were obtained between the various seed piece size treatments. The yield advantage was in favor of the larger size. The number of eyes per piece was less important except with the smallest size. In this case the seed pieces were incapable of adequately supplying plant growth from more than one eye. Small, whole tubers from good high yielding fields were found to be excellent for seed potato pieces.
    • 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.
    • Economic Feasibility of Cantaloup Production in Navajo County, Arizona

      Underwood, Amos; Farrish, Raymond (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Cantaloup Bed Shape Modification for Mechanical Harvest

      Harriott, B. L. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Current Arizona cultural practices for cantaloup are not compatable with mechanized harvesting equipment now being developed for cantaloup. Mechanical harvesters will require a uniformly sloped bed, preferably flat, at harvest time. Experiments thus far indicate that this condition can be met by reshaping the conventional bed after the plants have emerged.
    • Effects of Treatments on the Postharvest Senescence of Green Leaves

      Bessey, Paul M. (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)
    • Studies on Fall Production Problems with Irish Potatoes in Arizona

      Bessey, Paul M. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Lettuce Nutrition as Influenced by Nitrogen, Phosphorus, Potassium and Magnesium Fertilization

      Stanersen, L. A.; Turner, Fred Jr. (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)
    • Labor Requirements for Vegetable Crops in Arizona

      Pawson, Walter (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
    • Feasibility of Protectice Cropping (Plastic Greenhouse Production) in Central Arizona

      Foerman, B. R. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      After commercial production on a trial basis during a four-year period (1961-65), protective cropping of tomatoes and possibly a few other higher return vegetable crops shows a promising alternative enterprise for local production whosever risks are intensified. Better adapted varieties, disease control and market development are primary objectives to be overcome.
    • 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.
    • Effects of Magnesium, Nitrogen, and Micronutrients on the Yield and Incidence of Crown Blight of Cantaloups in Yuma Area

      Turner, Fred Jr.; Grounds, R. E. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Yield differences resulting from magnesium, nitrogen, and micronutrients application were small. The incidence of crown blight was spotty and not related to fertilizer treatment.
    • Irrigation Studies with Carrots

      Pew, W. D.; Park, J. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-08)
      Data from four years of irrigation studies with carrots indicate this crop has a rather wide tolerance to varying soil moisture levels as measured by yield and quality of roots. Yields have varied between treatments from 514 to 665 crates per acre. Soil moisture levels ranging from a very wet level (18-20 centibars of tension) to a dry level (75-80 centibars of tension) have shown no significant differences in yield. Only from treatment 5, the very dry schedule, was the yield significantly lower than for all other treatments.