Diagnose yerba mate nutritional and photosynthetic indices under different levels of zinc fertilization

• Autor(a) principal: Gelsleichter, Samara Deschamps
• Data de Publicação: 2023
• Outros Autores: Massaneiro, Heloisa Milesky Alves, Silva, Andrei de Souza da, Dors, Priscilla, Miquelluti, David José, Campos, Mari Lucia, Moreira, Marcelo Alves
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Nativa (Sinop)
• Texto Completo: https://periodicoscientificos.ufmt.br/ojs/index.php/nativa/article/view/11895
• topic: biofortificação agronômica; Cambissolo; Ilex paraguariensis

Zinc deficiency represents a public health problem. One of the strategies to improve this issue is agronomic biofortification. The objective of this research was to evaluate the Zn content in the aerial part (leaves and branches) and the critical limit of Zn for yerba mate plants submitted to fertilization with Zn sulfate. The experiment was conducted in a greenhouse in the municipality of Lages. A typical Dystrophic Cambisol was used, which was subjected to chemical (Tedesco et al., 1995) and granulometric (EMBRAPA, 1997) analysis. The experimental design used was completely randomized. The experimental units were composed of pots containing 6 kg of soil, five doses of Zn (0, 100, 200, 300 and 400 mg.kg-1) and seven replications, totaling 35 experimental units. Analyzes were performed before harvesting (SPAD Index, height and Infrared Gas Analyzer - IRGA) and analyzes after harvesting (fresh and dry aerial weight). The data were submitted to analysis of variance, with normality tested by the Shapiro-Wilk test and homogeneity of variances by the Levenne test, at a significance level of 5%. The application of increasing doses of Zn to the soil resulted in a linear increase in the Zn content in the aerial part. The average Zn content in the leaf varied from 27 mg kg-1 in the absence of Zn application to 883 mg kg-1 at the applied dose of 400 mg kg-1. There was no statistical difference for fresh, dry shoot weight, SPAD index, height, stomatal conductance and perspiration indicating absence of oxidative stress. It was not possible to calculate the critical limit of Zn for yerba mate.