Submitted to: Pecan Grower
Publication Type: Trade Journal
Publication Acceptance Date: September 20, 2004
Publication Date: October 5, 2004
Citation: Wood, B.W. 2004. Nickel nutrition of pecan. Pecan Grower. 16(2):4-7. Interpretive Summary: Pecan orchards experience yield loss due to various levels of nickel (Ni) deficiency. A protocol was developed for Ni usage in orchards so as to avoid Ni related problems. This Ni management strategy will enable farmers to protect against Ni related yield losses.
Technical Abstract: Most U.S. pecan orchards would benefit from one or two annual applications of Ni as a foliar spray. Such sprays should be applied at Ni rates of 25 to 100 ppm, depending on degree of Ni deficiency. Sprays can be applied in early spring within about 10 days after bud break or, in the case of severe deficiency, in the autumn. Autumn treatment ensures Ni is present in buds at time of spring bud break. Most orchards are thought to experience chronic (hidden hunger) Ni deficiencies. Acute deficiencies (those showing visual symptoms) are relative few, but the number is increasing as soils accumulate metals that reduce Ni uptake by plants (i.e., Zn, Cu, Ca, and Mg).