8. Wpływ nawożenia potasem na plon nasion oraz zawartość i jakość tłuszczu nagietka lekarskiego (Calendula officinalis L.) – Beata Król
Słowa kluczowe: odmiana, efektywność rolnicza, zawartość oleju, skład kwasów tłuszczowych, izomery kwasu linolenowego, kwas nagietkowy
EFFECT OF POTASSIUM FERTILIZATION ON YIELD, CONTENT AND FAT QUALITY OF POT MARIGOLD (CALENDULA OFFICINALIS L.) SEEDS
Pot marigold seed oil contains conjugated linolenic acids (CLNA) i.e. α- and β-calendic acid that may be utilized by pharmaceutical and chemical industries. The aim of our experiment with pot marigold was to determine how potassium fertilization affects seed yield, oil content and fatty acid composition. In a 2-year field experiment the effect of increasing doses of potassium (0, 30, 60, 90, 120 kg K ha-1) on 3 pot marigold cultivars (Tokaj, Orange King, Persimmon Beauty) was compared. Potassium fertilization had a positive effect on plant growth and resulted in a marked increase of seed yields. Nevertheless, response to potassium fertilization varied from cultivar to cultivar: Persimmon Beauty gave a significant yield increase at doses of 30 and 60 kg K ha-1, while Tokaj and Orange King needed more potassium (60 and 90 kg K ha-1). Further increase in potassium application did not bring about any significant improvement of yields. Averaged across 2 years, cv. Orange King gave the highest yield (1.83 t ha-1) and Persimmon Beauty (1.58 t ha-1) the lowest. Cvs. Orange King and Tokaj had a high crude fat content (20.7% and 19.9%), while Persimmon Beauty yielded oil that was rich in desirable conjugated linolenic acids (i.e. α- and β-calendic acid) 53,36%). Fertilization with potassium did not affect either fat content or fatty acids composition. However, both traits markedly depended upon weather conditions during growth (especially during flowering and seed set).
key words: cultivar, agronomic efﬁciency, oil content, fatty acid composition, conjugated linolenic acids, calendic acid