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dos Santos, A.L., Monnerat, P.H. and Alves, E.A.B. (2003) Foliar Boron Content Depending on the Application of Borax in Leaf Axil of Green Dwarf Coconut in Norte Fluminense. Pesquisa Agropecuária e Desenvolvimento Sustentável, 1, 165-171.

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• TITLE: Diagnosis of Boron Deficiency in Green Dwarf Coconut Palm

  AUTHORS: Leandro Glaydson da Rocha Pinho, Pedro Henrique Monnerat, André Assis Pires, Marta Simone Mendonça Freitas, Claudio Roberto Marciano

  KEYWORDS: Symptoms, Leaf Analysis, Deficiency Induction, Boric Acid, Samples, Cocos nucifera

  JOURNAL NAME: Agricultural Sciences, Vol.6 No.1, January 27, 2015

  ABSTRACT: The diagnosis of boron deficiency in coconut palms has been hampered by lack of information about its distribution in the plant. Two experiments were conducted, one in a greenhouse to induce boron deficiency in dwarf green coconut palms, and other in the field, in which the plants received doses of boric acid, B(OH)3. The objective was to verify symptoms of boron deficiency and boron content variation in canopy, leaves and folioles (or leaflets). Boron deficient plants led leaves and folioles to become deformed. The deficient and sufficient contents of boron varied significantly in the canopy, but did not vary in leaves. The boron content increased significantly from bottom to the apex of the folioles in both treatments. To survey the level of boron in the coconut palm, the ideal is, using samples taken from the youngest leaf, to calculate the relation between the boron content in the apex of the foliole and the content in the center or in the folioles bottom, with minimum values 2.2 or 2.7, respectively.