Two field experiments were conducted at the Research
and Experimental Station of Moshtohor, 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 (Helfanthus annuus,, L.) var. Mayak. Application
ot nitrogen increased plant height, number of leaves/plant,
stem diameter1 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 vas signifi
cantly decreased. Phosphorus (16 kg P205/fad.) showed a
significant increase in all previous characters. All the
studied characters were affected significantly by application
of potassium fertilizer (24 kg J(20/fad.) except L.A.
dm’fplant and seed yield/plant. The interaction effect
of nitrogen x phosphorus, nitrogen x potassium, phosphorus
x potassium and nitrogen z 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.
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