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A field experiment was conducted on medium black clayey soils under rainfed conditions at Main Research Station, University of Agricultural Sciences (UAS), Dharwad, India, during  kharif  1999 to study the effect of different levels and ratios of nitrogen and phosphorus on seed yield and nutrient uptake of the sunflower hybrid DSH-1. The experiment consisted of nine treatments, i.e., N/P ratios with two N/P ratios of &lt;1.0 (0.67 and 0.80), N/P ratio of 1.0 consisting of two ratios and four N/P ratios of &gt;1.0 (1.20,1.30,1.60 and 2.00) along with control (no nitrogen and phosphorus) as keeping potassium level (60 kg K 2 O ha -1 ) as constant. The results showed that nitrogen and phosphorus applied in N/P ratios of &gt;1.0 with 2.00 : 1.25 : 1.00 fertilizer level and N/P ratio of 1.0 with 2.00 : 2.00 : 1.00 fertilizer level produced 21 and 27 percent higher seed yield over the UAS, Dharwad fertilizer recommendation, i.e., N/P ratio of &lt;1.0 with 1.00 : 1.25 : 1.00 fertilizer level (2800 kg ha -1 ). At maturity, higher nitrogen (177.72 kg and 186.27 kg N ha -1 ), phosphorus (23.66 kg and 27.75 kg P 2 O 5  ha -1 ) and potassium (124.85 kg and 126.68 kg K 2 O ha -1 ) uptakes were obtained in the treatment receiving N/P ratio of &gt;1.0 with 2.00 : 1.25 : 1.00 (120 kg N, 75 P2O5 and 60 kg K 2 O ha -1 ) and in the treatment receiving N/P ratio of 1.0 with 2.00 : 2.00 : 1.00 (120 kg N, 120 P 2 O 5  and 60 kg K 2 O ha -1 ) fertilizer levels as compared with the UAS, Dharwad fertilizer recommendation, i.e., N/P ratio of &lt; 1.0 with 1.00 : 1.25 : 1.00 (60 kg N, 75 P 2 O 5  and 60 kg K 2 O ha -1 ).

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EFFECT OF NITROGEN AND PHOSPHORUS LEVELS AND RATIOS ON SEED YIELD AND NUTRIENT UPTAKE OF SUNFLOWER HYBRID DSH-I / LA INFLUENCIA DE DIFERENTES CANTIDADES Y PROPORCIONES DE NITRÓGENO Y DE FÓSFORO EN LA ADOPCIÓN DE LAS MATERIAS NUTRITIVAS EN HÍBRIDOS / EFFET DE DIFFÉRENTES QUANTITÉS ET PROPORTIONS D’AZOTE ET DE PHOSPHORE SUR L’ABSORPTION DE MATIÈRES NUTRITIVES PAR L’HYBRIDE DE TOURNESOL (DSH-1)