RT Journal Article
SR Electronic
A1 Škarpa, Petr
A1 Lošák, Tomáš
T1 Changes in selected production parameters and fatty acid composition of sunflower (Helianthus annuus, L.) in response to nitrogen and phosphorus applications
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 56
IS 5
SP 203
OP 210
DO 10.11118/actaun200856050203
UL https://acta.mendelu.cz/artkey/acu-200805-0027.php
AB The effect of N and P fertilization on the dry matter content, concentration of nutrients (N, P, K, Ca and Mg) and their intake by the plant, production characteristics (achene yields, head diameter, 1000-seed weight, oil content and oil production) and the content of fatty acids (palmitic, stearic, palmitooleic, oleic, linoleic and linolenic) was evaluated in the one-year pot trial with sunflower (Helianthus annuus, L.). Nitrogen application had a positive effect on dry matter production and increased N intake by plants as early as the beginning of vegetation (4<sup>th</sup> true leaf). The effect of P on dry matter production was not markedly evident until the later growth stage (10<sup>th</sup> true leaf). At the end of the vegetation period the weight of plants of variants fertilised with N only and variants where P was applied evened out. Achene yields, head diameters, 1000-seed weight, oil content and oil production increased statistically significantly after N application. Of all the monitored characteristics the increased level of P in the soil affected only the 1000-seed weight. The application of both nutrients did not significantly change the content of fatty acids.