PT  - JOURNAL ARTICLE
AU  - Škarpa, Petr
AU  - Lošák, Tomáš
TI  - Changes in selected production parameters and fatty acid composition of sunflower (Helianthus annuus, L.) in response to nitrogen and phosphorus applications
DP  - 2014 Nov 3
TA  - Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
PG  - 203--210
VI  - 56
IP  - 5
AID - 10.11118/actaun200856050203
IS  - 12118516
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.