Nitrogen management efficiency against sunflower (Helianthus annus L.) under different irrigation frequencies

A field trial to examine nitrogen management efficiency against sunflower under varying irrigation frequencies was performed during 2015 at Agriculture Chemistry (Soils) Section, ARI Tandojam.Four N levels (0, 50, 100, 150 kg ha -1 ) and four irrigation frequencies (2, 3, 4, 5 irrigations) were evaluated in RCBD with three replicates.The response of sunflower crop to varying N rates and irrigation frequency in relation to growth, seed yield and oil content was significant (P<0.05).Apart from the crop growth traits, sunflower seed yield was highest (2520.90kgha -1 ) with 41.73% oil content; while seed yield decreased to 2268.90 kg ha -1 and oil content increased (42.09%) under 100 kg ha -1 N over 150 kg N ha -1 .The N @50 kg ha -1 remained least in all the growth and seed yield traits.Similarly, 04 times irrigated sunflower produced highest seed yield (2198.80 kg ha -1 ) and oil content (41.10%); while 05 times irrigated crop showed relatively lesser seed yield (1953.40 kg ha -1 ) and oil content (39.71%).The seed yield responded superbly to higher N (150 kg ha -1 ) with maximum seed yield (2520.9 kg ha -1 ) but oil yield slightly decreased; while 04 times irrigated crop resulted in highest seed yield (2198.8 kg ha -1 ) and oil content (41.10%).