Nutritional efficiency in sunflower cultivars under dosages of potassium in semiarid region

Gisele Lopes dos Santos; Allysson Pereira dos  Santos; Manoel Galdino dos Santos; Hamurábi Anizio Lins; Almir Rogerio Evangelista de  Souza; Francilene de Lima Tartaglia; Lindomar Maria da  Silveira; Aurélio Paes Barros  Júnior

doi:10.14393/BJ-v39n0a2023-54188

Authors

Gisele Lopes dos Santos Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0002-1134-4672
Allysson Pereira dos Santos Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0002-2224-241X
Manoel Galdino dos Santos Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0003-4972-5849
Hamurábi Anizio Lins Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0002-4548-9108
Almir Rogerio Evangelista de Souza Instituto Federal de Educação, Ciência e Tecnologia de Alagoas https://orcid.org/0000-0002-9266-5063
Francilene de Lima Tartaglia Instituto Federal de Educação, Ciência e Tecnologia de Alagoas https://orcid.org/0000-0001-6023-0033
Lindomar Maria da Silveira Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0001-9719-7417
Aurélio Paes Barros Júnior Universidade Federal Rural do Semi-Árido https://orcid.org/0000-0002-6983-8245

DOI:

https://doi.org/10.14393/BJ-v39n0a2023-54188

Keywords:

Helianthus annuus L. , Nutrition, Potassium fertilization, Yield.

Abstract

Potassium (K) participates in critical processes in sunflower cultivation, such as osmotic regulation and translocation of photosynthesis. However, the absorption or accumulation of this nutrient occurs differently owing to edaphoclimatic factors or between cultivars. The objective of this study was to evaluate the nutritional efficiency of sunflower cultivars as a function of different dosage K dosages in a semiarid region. To this end, two experiments were conducted in 2016 and 2017. The treatments consisted of five dosages of K at 0, 30, 60, 90, and 120 kg ha^-1 K₂O and four sunflower cultivars, Aguará 6, Altis 99, Multissol, and BRS 122. The experimental design was a randomized block with four replications and subdivided plots. The characteristics evaluated were agronomic efficiency, physiological efficiency, recovery efficiency, utilization efficiency, and accumulation of total K in the plant. Sunflower cultivars responded to K dosages in the two crops, with variations in efficiency parameters. Crop 2 showed better nutritional efficiency compared to crop 1. Aguará 6 showed greater nutritional efficiency than the other two crops. The use of dosages between 75 and 91 kg ha^-1 of K₂O provided better efficiency in K usage for the cultivars.

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