Foliar Application and Translocation of Radiolabeled Zinc Oxide Suspension vs. Zinc Sulfate Solution by Soybean Plants

Anita Beltrame, João Paulo Rodrigues Marques, Mariana Ayres Rodrigues, Eduardo de Almeida, Márcio Arruda Bacchi, Elisabete Aparecida De Nadai Fernandes, Rafael Otto () and Hudson Wallace Pereira de Carvalho ()
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Anita Beltrame: Department of Soil Science, “Luiz de Queiroz” College of Agriculture, University of São Paulo, 11 Paduas Dias Avenue, Piracicaba 13418-900, SP, Brazil
João Paulo Rodrigues Marques: Department of Basic Sciences, School of Animal Science and Food Engineering, University of São Paulo, Pirassununga 13635-900, SP, Brazil
Mariana Ayres Rodrigues: Department of Soil Science, “Luiz de Queiroz” College of Agriculture, University of São Paulo, 11 Paduas Dias Avenue, Piracicaba 13418-900, SP, Brazil
Eduardo de Almeida: Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, Piracicaba 13416-000, SP, Brazil
Márcio Arruda Bacchi: Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, Piracicaba 13416-000, SP, Brazil
Elisabete Aparecida De Nadai Fernandes: Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, Piracicaba 13416-000, SP, Brazil
Rafael Otto: Department of Soil Science, “Luiz de Queiroz” College of Agriculture, University of São Paulo, 11 Paduas Dias Avenue, Piracicaba 13418-900, SP, Brazil
Hudson Wallace Pereira de Carvalho: Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, Piracicaba 13416-000, SP, Brazil

Agriculture, 2025, vol. 15, issue 2, 1-17

Abstract: The present study employed a 65 Zn radioactive isotope as a tracer to investigate the foliar uptake and distribution patterns of ZnO concentrated suspension- and ZnSO 4 solution-sprayed on soybean plant leaves. The radiolabeled foliar treatments were sprayed on the leaves at V4 and V8 phenological stages. The radioactivity of 65 Zn in the leaves, roots, stems, and pods was determined using γ-ray spectrometry. After the first foliar spray, V4, the partition of radiolabeled Zn in plants treated with ZnO and ZnSO 4 was 99.22% and 98.12% in treated leaves, 0.15% and 0.39% in stems, 0.16% and 0.29% in roots, and 0.47% and 1.19% in newly expanded non-treated leaves, respectively. After two sprayings, V4 and V8, the partition of radiolabeled Zn in plants treated with ZnO and ZnSO 4 was 92.56% and 92.18% in treated leaves, 0.92% and 0.70% in stems, 0.52% and 0.39% in roots, 5.60% and 6.15% in newly expanded non-treated leaves, and 0.43% and 0.61% in grains, respectively. The total fraction translocated from the application tissue was 0.79% and 1.91% for ZnO and ZnSO 4 , respectively, after 12 days and 8.03% and 8.48% for ZnO and ZnSO 4 , respectively, after 72 days. An anatomical analysis revealed that plants cultivated in a nutrition solution with 10% ionic strength had 63% fewer stomata, and the xylem vessels were 63% smaller compared to plants grown in a solution with 100% Zn ionic. One can conclude that after a short period, 12 days, the absorption and translocation of ZnSO 4 was higher and faster than ZnO, and after the long period, 72 days, their performance was similar.

Keywords: 65 Zn; ZnSO 4; ZnO; foliar spray; leaf anatomy (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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