Resumo

OSORIO VERA, Leticia Raquel et al. Zinc fertilization in wheat, corn and sesame in soils of different textures. Investig. Agrar. [online]. 2021, vol.23, n.2, pp.53-62. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2021.diciembre.2302691.

Zinc (Zn) is an essential nutrient for plants, however, there are still few studies related to this nutrient in Paraguay. The aim of this experiment was to evaluate the effect of the application of Zn on wheat, corn and sesame crops in two soils of different textures. The experiment was carried out in a greenhouse, in pots with 5 kg of soil, between February 2017 and January 2018. The experimental design used was completely randomized with a bifactorial arrangement, with 5 repetitions. The factors evaluated were: Factor 1, soil textures (sandy and clay loam) and Zn doses (0, 10, 20, 40 and 80 mg kg-1 of Zn) applied before sowing wheat and corn, evaluating the residual effect of Zn in sesame. The Zn level in the soil and in the tissue, the plant height and the dry matter weight were determined. The soil texture did not influence the Zn content in the soil and in the leaf tissue of the plants. The zinc content in the soil and the Zn concentration in the tissue increased linearly with the higher dose of Zn applied. Plant height was affected by soil texture in the three crops and dry matter production in grasses. Zn increased the plant height of wheat and corn, but not that of sesame. Dry matter and plant height of wheat and corn increased in sandy soil, not so in sesame. Corn and wheat showed a significant effect on growth parameters depending on the Zn doses applied to the sandy soil. Dry matter production suffered interaction between soil and Zn doses in wheat and corn. The application of Zn allows the increase of its levels in the soil and plant tissue, but not always in the production of dry matter.

Palavras-chave : Zinc in tissue; zinc in soil; zinc sulfate; zinc dose.

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