Evaluation of nitrogen nutrition of canola (Brassica napus L.) in Gorgan area, Iran

Subject Areas : Agroecology Journal

Alireza Behdadaian ¹ (M.Sc. Student, Gorgan Branch, Islamic Azad University, Gorgan, Iran.)
Afshin Soltani ² (Prof. in Agronomy, Gorgan Natural Resources University, Gorgan, Iran.)
Hosein Ajamnorozi ³ (Prof. in Agronomy, Gorgan Natural Resources University, Gorgan, Iran.)
Ebrahim Zeynali ⁴ (Prof. in Agronomy, Gorgan Branch, Islamic Azad University, Gorgan, Iran.)

Received: 2012-06-27 Accepted : 2013-12-20 Published : 2014-01-21

Keywords: Canola, critical nitrogen dilution curve, Fertilizer management, Nitrogen Nutrition Index,

Abstract :

In  order  to  study  the  effect  of  agricultural  management  on  nitrogen  nutrition  index  of  canola,  a  field experimental was conducted in 2010. Experiment was carried out as a nested completely randomized design with three replications. In this field experiment, 15 canola fields were comparatively studied in three levels of management (optimum, middle, weak) in Gorgan area, Iran. Sampling was performed at four stages and characteristics including plant density and height, leaf area index, dry weight, total nitrogen percent, biological yield and harvest index were measured. Also, nitrogen nutrition index was determined at stem formation, flowering and carpetbag stages. The results showed that all the studied management levels and farms within each level were significantly different from nitrogen nutrition index point of view. Positive significant correlation between nitrogen nutrition index with seed and biological yeild at yellow bud stage revealed the importance of nitrogen sources access at flowering and seedbag filling stages. Although nitrogen nutrition index was higher in optimum level of  management  than  in  the  middle  and  weak  ones,  but during  growing  season  and  in  all management levels, the index was less than 1 that indicates nitrogen deficiency. Thus, it could be concluded that nitrogen is a limitation factor in canola production in Gorgan area, Iran.

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