Abstract
Increasing the area of arable oilseed land, particularly rapeseed, and the important roleof potassium in yield and oil content, especially in calcareous and high pH soils, need tomore knowledge about plant nutrition requirement. In this study, the effect of sourcesand different levels of potassium fertilizers on some quality and quantity characteristicson canola yield were assessed by combined analysis factorial experiment based on randomizedcomplete blocks design during 2011-2013. Two potassium fertilizer sources:potassium sulfate and potassium chloride with four levels of the potassium fertilizer control,100, 150, 200 kg.ha-1 in main plot and sub plot, respectively. Results of combinedanalysis of variance showed effect of potassium sources on capsule in plant and oil yieldwas significant at 5% probability level. Also effect of potassium rate on capsule in plant,seed yield and oil content was significant at 5% and 1% probability level. Interactioneffect of treatments on capsule in plant, seed yield, oil yield and oil content wassignificant. Potassium chloride fertilizer impact on yield and its components showedbetter results. Interaction effects of sources and rates of potassium showed the highestseed and oil yield (2128 and 878 kg.ha-1, respectively) from 100 kg.ha-1 potassium chloridetreatment. Also the highest capsule in plant and seed in capsule obtained from 150kg.ha-1 potassium chloride treatment. Finally, for increasing canola yield application of100 kg.ha-1 potassium chloride recommended.
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