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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Uptake and Distribution of Soil Applied Zinc by Citrus Trees-Addressing Fertilizer Use Efficiency with Zn-68 Labeling

Texto completo
Autor(es):
Rieger Hippler, Franz Walter [1] ; Boaretto, Rodrigo Marcelli [1] ; Quaggio, Jose Antonio [2] ; Boaretto, Antonio Enedi [3] ; Abreu-Junior, Cassio Hamilton [3] ; Mattos, Jr., Dirceu [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Inst Agron IAC, Ctr Citricultura Sylvio Moreira, Sao Paulo - Brazil
[2] Inst Agron IAC, Ctr Solos & Recursos Ambientais, Sao Paulo - Brazil
[3] Univ Sao Paulo, CENA, BR-09500900 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: PLoS One; v. 10, n. 3 MAR 9 2015.
Citações Web of Science: 8
Resumo

The zinc (Zn) supply increases the fruit yield of Citrus trees that are grown, especially in the highly weathered soils of the tropics due to the inherently low nutrient availability in the soil solution. Leaf sprays containing micronutrients are commonly applied to orchards, even though the nutrient supply via soil could be of practical value. This study aimed to evaluate the effect of Zn fertilizers that are applied to the soil surface on absorption and partitioning of the nutrient by citrus trees. A greenhouse experiment was conducted with one-year-old sweet orange trees. The plants were grown in soils with different textures (18.1 or 64.4% clay) that received 1.8 g Zn per plant, in the form of either ZnO or ZnSO4 enriched with the stable isotope Zn-68. Zinc fertilization increased the availability of the nutrient in the soil and the content in the orange trees. Greater responses were obtained when ZnSO4 was applied to the sandy loam soil due to its lower specific metal adsorption compared to that of the clay soil. The trunk and branches accumulated the most fertilizer-derived Zn (Zn-dff) and thus represent the major reserve organ for this nutrient in the plant. The trees recovered up to 4% of the applied Zn-dff. Despite this relative low recovery, the Zn requirement of the trees was met with the selected treatment based on the total leaf nutrient content and increased Cu/Zn-SOD activity in the leaves. We conclude that the efficiency of Zn fertilizers depends on the fertilizer source and the soil texture, which must be taken into account by guidelines for fruit crop fertilization via soil, in substitution or complementation of traditional foliar sprays. (AU)

Processo FAPESP: 10/17589-9 - Eficiência da aplicação e do uso de micronutrientes metálicos em citros
Beneficiário:Jose Antonio Quaggio
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/02981-0 - Eficiência da aplicação de micronutrientes metálicos via solo em citros
Beneficiário:Franz Walter Rieger Hippler
Linha de fomento: Bolsas no Brasil - Mestrado