Mobilidade de boro (10B) em cajueiro (Anacardium occidentale L.) e pessegueiro (Prunus persica L.)
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Data
2011-10-24
Autores
Souza, Juliana Aparecida de [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Recentemente foi demonstrado que o boro exibe rápida e significante mobilidade no floema de algumas espécies produtoras de polióis. Os polióis como os açúcares alcoóis sorbitol, dulcitol e manitol possuem a capacidade de complexar o B conferindo a esse elemento alguma mobilidade dentro da planta. As espécies selecionadas foram o cajueiro (não produtora de sorbitol) e o pessegueiro (produtora de sorbitol). O trabalho teve por objetivo verificar a mobilidade de B aplicado via foliar em mudas de cajueiro e pessegueiro. As espécies foram conduzidas separadamente em dois experimentos em casa de vegetação pertencente a UNESP/FEIS no município de Ilha Solteira-SP. O delineamento experimental foi em blocos ao acaso, com três repetições, em parcelas subdivididas, em duas épocas (30 e 60 dias). Foram avaliados nas parcelas cinco tratamentos e nas subparcelas dois tipos de folha (folhas velhas e folhas novas). Os tratamentos estudados constituiram-se da adubação via solo e/ou via foliar com boro marcado ou não com 10B, da seguinte forma: sem adubação via solo e foliar com B (Sol -B Fol -B); sem adubação via solo com B e adubação foliar com 10B (Sol -B Fol 10 B); adubação via solo com B e sem adubação foliar (Sol B Fol -B); adubação via solo com B e foliar com 10B (Sol B Fol10B) e adubação via solo com 10B e foliar com B (Sol10B Fol B). Na adubação via solo o mesmo foi acrescido de B na dose de 0,5 mg kg-1 de solo e na adubação via foliar aplicação de solução com B na doses de 255 mg L-1, utilizando-se como fonte de B o ácido bórico e ácido bórico enriquecido com átomos de 10 B (99%). Foram avaliados quinzenalmente a altura e o número de folhas e o teor total de B e a porcentagem de B na folha velha e folha nova proveniente do fertilizante aos 30 e 60 dias após a aplicação dos tratamentos
Recently it was demonstrated the boron mobility in the phloem of some species producing polyols. The polyols or such alcohols sugar as sorbitol, mannitol and dulcitol are capable of complexing B giving to this element some mobility within the plant. This work had the objective to study the effect of fertilization with boron in the soil and leaves of cashew and peach seedling. They were conducted two experiments for 120 days in the greenhouse at UNESP, Ilha Solteira/SP. The experimental design was randomized blocks with three replications in a split plot, in two times for collection of leaves (30 and 60 days after application of treatments). We studied five treatments in plots and two ages of leaves in the subplots (old leaves and new leaves). The treatments studied were: no fertilizer with B in the soil and leaves (Sol -B Fol -B); without fertilizer with B in the soil and leaves with 10B (Sol - B Fol10B); fertilizing in the soil with B and leaves without B (Sol B Fol -B); fertilizing in the soil with B and leaves with 10B (Sol B fol10B) and fertilizing in the soil with 10 B and leaves with B (Sol10B Fol B). Were evaluated the height and the number of leaves biweekly and B total content and B percentage at the leaf from the fertilizer (% Bfopf) at 30 and 60 days. There was no fertilization effect with boron in the cashew seedling growing . The foliar fertilization with boron showed higher increase in the leaves number on peach seedlings at 60 days after fertilization. Boron foliar application is restricted or intermediate mobility in mobile cashew and peach evaluated at 30 and 60 days after fertilization
Recently it was demonstrated the boron mobility in the phloem of some species producing polyols. The polyols or such alcohols sugar as sorbitol, mannitol and dulcitol are capable of complexing B giving to this element some mobility within the plant. This work had the objective to study the effect of fertilization with boron in the soil and leaves of cashew and peach seedling. They were conducted two experiments for 120 days in the greenhouse at UNESP, Ilha Solteira/SP. The experimental design was randomized blocks with three replications in a split plot, in two times for collection of leaves (30 and 60 days after application of treatments). We studied five treatments in plots and two ages of leaves in the subplots (old leaves and new leaves). The treatments studied were: no fertilizer with B in the soil and leaves (Sol -B Fol -B); without fertilizer with B in the soil and leaves with 10B (Sol - B Fol10B); fertilizing in the soil with B and leaves without B (Sol B Fol -B); fertilizing in the soil with B and leaves with 10B (Sol B fol10B) and fertilizing in the soil with 10 B and leaves with B (Sol10B Fol B). Were evaluated the height and the number of leaves biweekly and B total content and B percentage at the leaf from the fertilizer (% Bfopf) at 30 and 60 days. There was no fertilization effect with boron in the cashew seedling growing . The foliar fertilization with boron showed higher increase in the leaves number on peach seedlings at 60 days after fertilization. Boron foliar application is restricted or intermediate mobility in mobile cashew and peach evaluated at 30 and 60 days after fertilization
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Palavras-chave
Sorbitol, Elementos traços na nutrição, Árvores frutíferas, Micronutrients, Fruit trees
Como citar
SOUZA, Juliana Aparecida de. Mobilidade de boro (10B) em cajueiro (Anacardium occidentale L.) e pessegueiro (Prunus persica L.). 2011. 68 f. Dissertação (mestrado) – Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, 2011.