The effects of supplementary irrigation on the yield and yield components of three cultivars of sunflower in dry farming
2009
Mazaheri-Laghab, H., Assistant Professor of Agriculture Faculty Bu-Ali Sina University. Hamedan. Iran | Nouri, F., Expert of Agricultural Training Center. Jahade Keshavarzi Organization Kordestan Province | Zare Abyaneh, H., Assistant Professor of Agriculture Faculty Bu-Ali Sina University. Hamedan. Iran
For increasing plant production, an irrigation during the period of plant growth in dry farming is an appropriate technique. For evaluation of supplementary irrigation effects on sunflower (Helianthus annuus L.) yield, a factorial experiment as the base of RCBD (randomized complete block design) in 4 replicates was carried out in dry farming conditions in Kordestan region. Two factors composed of _time of an irrigation_ in 3 levels (no irrigation, a supplementary irrigation in flowering and a supplementary irrigation in seeding set stages) and another as _cultivars_ in 3 levels (Armavireski, Armavires and Record) were studied. Results indicated that irrigation in flowering stage had a significant effect on yield and other characteristics. The head diameter, seed length and percentage of seeds to shells were significantly affected by _cultivar_ and _cultivar * irrigation_. The highest yield of seeds and oil percentage were observed in flowering irrigation (863.65 kg/ha and 40.8%/ha respectively). The highest water use efficiency was equal to 1.34 Kg ha-1mm-1. The interaction between cultivars and irrigation time showed that an irrigation in flowering stage caused to produce the highest seed yield (902 kg/ha) in Record cultivar.
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