Sunflower fertigated with potassium fertilization in two agricultural seasons in the Brazilian semiarid region

The objective of this study was to evaluate the effect of potassium doses on the production components of sunflower cultivars grown in the semiarid climate region. The experiment was carried out in two agricultural seasons, in 2016 and 2017, at the Rafael Fernandes Experimental Farm, Mossoró, RN, Br...

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Bibliographic Details
Published in:Ciência agronômica 2020-01, Vol.51 (2), p.1
Main Authors: Santos, Allysson Pereira dos, Tartaglia, Francilene de Lima, Souza, Almir Rogerio Evangelista de, Santos, Manoel Galdino dos, Silveira, Lindomar Maria da, Barros Júnior, Aurélio Paes
Format: Article
Language:English
Subjects:
Agricultural production
AGRONOMY
Crop yield
Cultivars
Design of experiments
Diagnostic systems
Experimental design
Experimental farms
Farms
Fertigation
Fertilization
Helianthus
Helianthus annuus L
Oil
Oilseed crop
Plant nutrition
Potassium
Potassium doses
Potassium oxides
Seasons
Semi arid areas
Semiarid climates
Semiarid lands
Sunflowers
Vegetable oils
Yield
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Summary:The objective of this study was to evaluate the effect of potassium doses on the production components of sunflower cultivars grown in the semiarid climate region. The experiment was carried out in two agricultural seasons, in 2016 and 2017, at the Rafael Fernandes Experimental Farm, Mossoró, RN, Brazil. The experimental design used was randomized blocks, in split plots, with four replicates. Five potassium doses were evaluated in the plots: 0, 30, 60, 90 and 120 kg ha-1 of K2O, and four sunflower cultivars were evaluated in the subplots: Aguará 6, Altis 99, Multissol and BRS 122. The evaluated characteristics were: K content in the diagnostic leaf (KDL), thousand-achene weight (TAW), achene yield (AY), oil content (OC) and oil yield (OY). Potassium doses directly influenced agronomic variables, promoting better performance. The best K2O doses for sunflower yield were 77.7 and 80.2 kg ha-1 in the first season for the cultivars Altis 99 and Aguará 6, and 65.9 and 69.5 kg ha-1 in the second season for Altis 99 and Aguará 6. In the first season, the production results were higher than in the second, and the cultivars Aguará 6 and Altis 99 obtained the highest achene yield and oil yield in both agricultural seasons.
ISSN:1806-6690
0045-6888
1806-6690
DOI:10.5935/1806-6690.20200023