Zinc fertilization of avocado trees

  • Crowley D
  • Smith W
  • Faber B
 et al. 
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Methods for Zn fertilization of 'Hass' avocado (Persea americana Mill.) trees were evaluated in a 2-year field experiment on a commercial orchard located on a calcareous soil (pH 7.8) in Ventura County, Calif, The fertilization methods included soil- or irrigation-applied ZnSO4; irrigation-applied Zn chelate (Zn-EDTA); trunk injection of Zn(NO3)(2), and foliar applications of ZnSO4, ZnO, or Zn metalosate. Other experiments evaluated the influence of various surfactants on the Zn contents of leaves treated with foliar-applied materials and on the retention and translocation of radiolabeled (ZnSO4)-Zn-65 and Zn-65 metalosate after application to the leaf surface. In the field experiment, tree responses to fertilization with soil-applied materials were affected significantly by their initial status, such that only trees having

Author-supplied keywords

  • Fertigation
  • Foliar applications
  • Persea americana
  • Surfactant
  • Trace metal deficiencies

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  • David E. Crowley

  • Woody Smith

  • Ben Faber

  • John A. Manthey

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