Articles
MOBILITY OF ROOT AND LEAF ABSORBED BORON IN ORANGE TREES
Article number
721_46
Pages
325 – 330
Language
English
Abstract
Boron deficiency is widespread in Brazilian citrus orchards and decreases yield of the main varieties.
The prevention or correction of B deficiency is usually done by soil or foliar application.
The B mobility depends on formation of polyol-B-polyol complexes that are phloem-translocated and occurs mainly in the species which produce significant amounts of polyols (sorbitol, manitol and dulcitol). The objective of this work was to study B absorption by roots and leaves of orange trees and to quantify the contribution to fruits.
The experiment was conducted in a fertigated 4-year-old Valencia on Swingle Citrumelo block in the State of São Paulo, Brazil.
Treatments consisted in application of isotopically-enriched 10B in soil (fertigation) and leaves.
B distribution within trees was evaluated four months after of 10B application, in different parts of the branches: new (leaves, twigs and fruits developed after the treatment with 10B) and old parts (leaves and twigs already existing before the treatment with 10B). Samples were analyzed by total B content and 11B/10B isotope ratio (ICP-MS). The results showed that the percentage of B derived from fertilizer in the new branches and fruits were 60-65% when B was applied in the soil, and 10-20% when sprayed foliarly.
The prevention or correction of B deficiency is usually done by soil or foliar application.
The B mobility depends on formation of polyol-B-polyol complexes that are phloem-translocated and occurs mainly in the species which produce significant amounts of polyols (sorbitol, manitol and dulcitol). The objective of this work was to study B absorption by roots and leaves of orange trees and to quantify the contribution to fruits.
The experiment was conducted in a fertigated 4-year-old Valencia on Swingle Citrumelo block in the State of São Paulo, Brazil.
Treatments consisted in application of isotopically-enriched 10B in soil (fertigation) and leaves.
B distribution within trees was evaluated four months after of 10B application, in different parts of the branches: new (leaves, twigs and fruits developed after the treatment with 10B) and old parts (leaves and twigs already existing before the treatment with 10B). Samples were analyzed by total B content and 11B/10B isotope ratio (ICP-MS). The results showed that the percentage of B derived from fertilizer in the new branches and fruits were 60-65% when B was applied in the soil, and 10-20% when sprayed foliarly.
Authors
R.M. Boaretto, M.F. Giné, A.E. Boaretto, J.A. Quaggio
Keywords
10B, redistribution, translocation, citrus, plant nutrition
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