Resumo

D. L., Ojeda-Barrios et al. Foliar application of zinc chelates on pecan. Rev. Chapingo Ser.Hortic [online]. 2009, vol.15, n.2, pp.205-210. ISSN 2007-4034.

During 2007, a study was carried on pecan trees 8-years age applying Zinc. Orchard soil conditions were to a xerosol calcic, loam texture, alkaline pH and organic matter and CaCO₃ contents of 1.09 and 12.84% respectively. The experiment consisted on different applications of Zn products supplied from sprung leaf to maturity: Treatments were as followed: T1) Control, T2) NZN 100 mg·kg^-1 Zn, T3) EDTA-Zn 150 mg·kg^-1 Zn, T4) EDTA-Zn 100 mg·kg^-1 Zn, T5) EDTA-Zn 50 mg·kg^-1 Zn, T6) DTPA-Zn 100 mg·kg^-1 Zn. Although none of the treatments significantly improved the concentration of zinc in the leaves, Zn-DTPA was a 34.84% better than the other treatments. The values of chlorophyll in this study were 39,445 SPAD units, which is equivalent to 43 mg·litro^-1 extractable chlorophyll, consistent with values of Zn deficiency, 20 mg·kg^-1. The same applies to the leaf area index which is reduced by 30% in conditions of deficiency. Results are preliminary due to that pecan trees present alternancy.

Palavras-chave : Carya illinoensis; foliar nutrition; EDTA-Zn; DTPA-Zn.

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