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Article citations


Abbes, C., Parent, L.E., Karam, A. and Isfan, D. (1995) Onion Response to Ammoniated Peat and Ammonium Sulfate in Relation to Ammonium Toxicity. Canadian Journal of Soil Science, 75, 261-272.

has been cited by the following article:

  • TITLE: Nitrogen Fertilization as Ammonium or Nitrate-N on Hippeastrum hybridum Bulb Growth

    AUTHORS: Carlos Vazquez, Stewart T. Reed, Christopher Dunn

    KEYWORDS: Hippeastrum, Amaryllis, Nitrogen Fertilization, Ammonium, Nitrate

    JOURNAL NAME: Agricultural Sciences, Vol.6 No.12, December 31, 2015

    ABSTRACT: Hippeastrum (Hippeastrum hybridum), a native of Central and South America, is a bulbous ornamental flowering plant in the Amaryllidaceae family. However, the correct balance of NH4 to NO3-nitrogen in a fertilizer mix for Hippeastrum plants is largely unknown. Nitrogen was applied 2x weekly following irrigation at either 0.6 g (high), 0.3 g (medium) or 0.15 g (low) total N every four months. Nitrogen was supplied in different combinations of NO3 and/or NH4. Nitrate:NH4-N ratios were either 100% NO3:0% NH4 (100NO3), 70% NO3:30% NH4 (70NO3), 50% NO3:50% NH4 (50NO3) (second group only), 30%NO3:70%NH4 (30NO3), or 0% NO3/100% NH4 (100NH4). Growth in bulb diameter after one year of fertilizer treatments not only increased from 0.15 to 0.6 g N (low to high level), but also differed with the form of N supplied to the plant. The largest diameter bulbs were produced in the 70NO3 and 50NO3 high N treatments. Within any NO3/NH4-N ratio grouping, fertilization at the high N rate resulted in larger diameter bulbs. No significant differences existed between treatments in the number of bulbs produced. Bulb growth was greater with a portion of N supplied as NO3 than with NH4-N alone. These results indicate that application of N as a mixture of NH4 and NO3 at 0.6 g per 4 months produces the largest increase in bulb diameter.