Abstract
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 (2520.90 kgha‑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%). Keywords: Sunflower; Nitrogen efficiency; Irrigation frequency; Seed yield; Oil content http://dx.doi.org/10.19045/bspab.2017.60059
Highlights
But oil yield slightly decreased; while 04 times irrigated crop resulted in highest seed yield
Most of the crops in Pakistan are produced under irrigated conditions; it is essential to determine the water regimes leading to improved crop yields and irrigation efficiency
[10] Reported that proper scheduling of irrigation resulted in significantly maximum sunflower seed yield of 1391.7 kg ha-1 and response of plant height, diameter, seeds per head or seed weight of sunflower was found to be linearly related to the amount of irrigation
Summary
But oil yield slightly decreased; while 04 times irrigated crop resulted in highest seed yield The sunflower crop given highest N level of 150 kg ha-1 produced maximum seeds head-1 (2038.00), followed by 1834.20 and 1528.50 seeds head-1 noted in plots given N at the rates of 100 and 50 kg ha-1, respectively (Table 2).
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