• Effects of Soil Amendments on Crusting, Seedling Emergence and Yields of Onions, Tomatoes and Peppers

      Yacoub, M.; Clark, L. J.; Stroehlein, J. L.; Oebker, Norman F.; Kingdon, Lorraine B. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-05)
      Studies were carried out at the Safford Agricultural Center using some soil amendments as anti-crusting agents. The results are promising in terms of improved stands on soils subject to crusting. Additional research is needed in order to determine proper rates which will reduce crusting without being toxic to the emerging seedlings.
    • Onion Fertility Evaluation Under Different Levels of Salt Stress, Safford Agricultural Center 1986

      Clark, L. J.; Stroehlein, J. L.; Thatcher, L. M.; Oebker, Norman F.; Kingdon, Lorraine B. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-05)
      Yield data were taken with a long -day onion variety, using different levels of nitrogen, phosphorous and potassium and at two different levels of soluble salts in the soil. Yields of the plots with additional fertilizer applied did not vary statistically from the check plot, which had 79 lbs/ac of nitrogen and 66 lbs/ac of P205. A correlation was found, however, between the electrical conductivity of a saturated paste extract from the soil and the yield of onions. A loss of 205 sacks (50 lbs /sack) of onions per acre are lost for each unit increase in soil conductivity.
    • Onion Variety Trial, Safford Agricultural Center 1986

      Clark, L. J.; Harper, F.; Thatcher, L. M.; Oebker, Norman F.; Kingdon, Lorraine B. (College of Agriculture, University of Arizona (Tucson, AZ), 1987-05)
      As a followup to the previous years onion variety trial (1), 23 of the more promising long-day varieties were retested along with 5 new intermediate-day varieties. The soluble salts and exchangeable sodium percentage were high (4340 and 28.1%, respectively) in the field where the onions were grown. This suppressed the yields significantly from the previous year. The top yielder produced 386 sacks (50 lbs) compared with 956 sacks in 1985. The top yielders from 1985, Durango and Inca, performed well again this year. The new intermediate-day varieties produced well also and seem quite promising.