بررسي تناوب گندم سرداري با آفتابگردان روغني ، نخود و آيش در شرايط ديم

Study of Sunflower, Chickpea and Fallow Crop Rotations with Sardari Winter Wheat under dryland Conditions

In order to find a convenient crop rotation in West Azarbaijan dryland areas, field studies were conducted during 1991-1996 to compare and evaluate the existing 2-yr crop rotations including sunflower (Helianthus annul L.) - wheat (Triticum aestivum L., c.v. Sardari), chickpea (Cicer arientinum L.) - wheat and fallow - wheat. The experiments were undertaken on a silty clay soil (silt 48.2%, clay 42.4% and sand 9.4%), with OC = 0.88%, P (available) = 4.8 ppm, K (available) = 350 ppm and pH = 7.9 in Orumieh (West Azarbaijan) in dryland conditions. A randomized complete block design with 4 replications was used. Combined analysis results showed that there is no significant differences between different crop rotations . Wheat grain yields were 1.83, 1.78 and I .82 t ha-l in rotation with chickpea, sunflower and fallow, respectively. The effect of year was significant so that maximum yield derived from first year (2.02tha^-1) and minimum yield from second year (1.65tha^-1). Yield components analysis such as spike length, seed number per spike, TKW and harvest index showed no significant difference between crop rotations but effect of year was significant in all of these characters.