• Wheat and Barley Response to Nitrogen Fertilization at Safford Agricultural Center, 2000

      Clark, Lee J.; Carpenter, E. W.; Ottman, Michael (College of Agriculture, University of Arizona (Tucson, AZ), 2000-10)
      Yields of both wheat and barley were increased with the addition of nitrogen and the largest gain was seen when it was applied at the initiation of growth or at boot stage. Effects of applied nitrogen were somewhat masked by the addition of nitrogen through the use of well water. Nitrogen level in the well water added 21 pounds of nitrogen per acre foot of irrigation, adding 48 pounds of nitrogen throughout the growing season. With the low value of grain and the given cost of nitrogen fertilizer, added nitrogen did not increase profitability for the producer.
    • Wheat and Barley Response to Pre-plant Phosphorus at Safford Agricultural Center, 2000

      Clark, Lee J.; Carpenter, E. W.; Ottman, Michael (College of Agriculture, University of Arizona (Tucson, AZ), 2000-10)
      Bread wheat and barley were seeded in low phosphorus soils which had had varying rates of ammonium phosphate-sulfate (16-20-0) applied. Statistical increases in yield were seen in the wheat study. The increased bottom line with the lowest rate of phosphorus declined as rates of phosphorus increased. Low crop values and high fertilizer costs made high application rates uneconomical. Barley yields were not statistically increased with the addition of phosphorus and the economics of applying phosphorus for this crop were negative. A two year summary is included in this report.