Changes in selected production parameters and fatty acid composition of sunflower (Helianthus annuus, L.) in response to nitrogen and phosphorus applications
2008
Skarpa, P.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Losak, T.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin
The effect of N and P fertilization on dry matter content, concentrations 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 concentrations of fatty acids (palmitic, stearic, palmitooleic, oleic, linoleic and linolenic) was evaluated in a one-year pot trial with sunflower. Nitrogen application had a positive effect on dry matter production and increased N intake by the plants as early as the beginning of the vegetation period (4th true leaf). The effect of P on dry matter production was not markedly evident until the later growth stage (10th true leaf). Achene yields, head diameters, 1000-seed weight, oil content and oil production increased significantly after N application. The increased level of P in the soil affected only the 1000-seed weight. The application of both nutrients did not significantly change fatty acids concentrations.
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