Two field experiments were conducted at the Research
and Experimental Station of !loshtohor, Faculty of Agriculture
during 1988 and 1989 seasons to sutdy the effect of nitrogen,
phosphorus and potassium fertilizer levels on growth charac
ters, yield, yield components, oil content and oil yield
of sunflower (Hellanthus annuus, L.) var. Mayak. Application
ot nitrogen Increased plant height, number of leaves/plant,
stem diameter, leaf area dm’/plant, head diameter, weight
of head, weight of 100-seed, weight of seeds/plant, seed
yield and oil yield/fad. However, oil content was signifi
cantly decreased. Phosphorus (16 kg P205/fad.) 8howed a
significant increase in all previous characters. All the
studied characters were affected significantly by application of potassium fertilizer (24 kg K20/fad.) except L.A. dm’/plant and seed yield/plant. The interaction effect of nitrogen x phosphorus, nitrogen x potassium, phosphorus x potassium and nitrogen x phsosphorus X potassium were not significant for all traits under study in both seasons. The highest seed yield of sunflower under study was obtained by applying 60 kg N/fad., 16 kg P205/fad. and 24 kg K20/fad to the soil. |
