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Influencia de doses de boro e zinco no desenvolvimento e nutricao mineral do cacaueiro

by Nakayama, L.H.I.
Publisher: Ene-Abr 1989Subject(s): THEOBROMA CACAO | PLANTULAS | BORO | CINC | NUTRICION MINERAL | FERTILIZANTES DE OLIGOELEMENTOS | DOSIS DE APLICACION | CULTIVAR CATONGO | BRASIL | THEOBROMA CACAO | SEEDLINGS | BORON | ZINC | APPLICATION RATES | BRAZIL | THEOBROMA CACAO | PLANTULE | BORE | ZINC | DOSE D'APPLICATION | BRESIL In: Agrotrópica (Brasil) v. 1(1) p. 34-38Summary: To study the effect of doses of boron and zinc on the development and mineral nutrition of the Catongo cacao tree, experiments were done in a greenhouse in a dystrophic Vargito soil (PVA), using a randomized design with four repetitions. The doses applied were 0.25 and 0.50 mg/kg of soil for boron and 2.50 and 5.00 mg/kg of soil for zinc. A control (without boron and zinc) was used. The highest dose of boron (0.50 mg/kg) led to an increase of dry matter, stem diameter and plant height. It was considered that the adequate boron content in the 3rd leaf was of 44 ppm. In relation of zinc, the greater production of dry matter, greater stem diameter and greater plant height were obtained with the 2.2 ppm dose and the adequate content of zinc in the 3rd leaf was of 144 ppm. The 5.00 mg/kg dose of zinc caused a phytotoxic effect (282 ppm of zinc) in the cacao tree and led to an iron deficiency.
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To study the effect of doses of boron and zinc on the development and mineral nutrition of the Catongo cacao tree, experiments were done in a greenhouse in a dystrophic Vargito soil (PVA), using a randomized design with four repetitions. The doses applied were 0.25 and 0.50 mg/kg of soil for boron and 2.50 and 5.00 mg/kg of soil for zinc. A control (without boron and zinc) was used. The highest dose of boron (0.50 mg/kg) led to an increase of dry matter, stem diameter and plant height. It was considered that the adequate boron content in the 3rd leaf was of 44 ppm. In relation of zinc, the greater production of dry matter, greater stem diameter and greater plant height were obtained with the 2.2 ppm dose and the adequate content of zinc in the 3rd leaf was of 144 ppm. The 5.00 mg/kg dose of zinc caused a phytotoxic effect (282 ppm of zinc) in the cacao tree and led to an iron deficiency.

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