Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 1; Page(s) 1 To 8.
 
Paper: 

THE EFFECTS OF RATES OF NITROGEN AND MANGANESE ON THE YIELD AND QUALITY OF TWO WINTER CANOLA VARIETIES IN AHAR REGION, EAST AZARBAYJAN

 
 
Author(s):  BAI BOURDI A., MALAKOUTI M.J.
 
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Abstract: 
Canola (Brassica napus L.) is an oilseed crop that is getting more attention as a source of vegetable oil in the country. Canola requires high rates of nitrogen and is regarded as a nitrogen-demanding crop. Nitrogen affects the growth, plant height, flower bearing branches, and the total dry matter production. Nitrogen fertilizer also affects the canola plant density. The principal effect of nitrogen fertilizer on the canola yield components can be seen in the increased number of the seedpods per plant, which is the main factor in improving the yield of canola seeds. The level of glucose inolate in canola is considered as an important canola quality index, which seems to be affected by the level of nitrogen supplements. Manganese Plays an important role in canola crop quality, especially the oil content of the seeds. A completely randomized block experiment with 24 treatments and 3 replications was carried out during 2000-2001 growing seasons in Ahar region to investigate the effects of the rates of manganese and nitrogen applications on the yield and quality of two winter canola varieties. The experimental factors were: four rates of nitrogen (50, 100, 200, and 300 kg/ha) applied as urea; three rates of manganese (5, 10 and 15 kg/ha) applied as manganese sulfate; and two winter canola varieties of Okapi and SLMO46. The analysis of variance showed that nitrogen rates significantly (at 1% level) affected canola yield. The highest yield was obtained with 300 kg N/ha. Likewise, the highest yield of canola oil was obtained with 200 and 300 kg N/ha N/ha. The highest oil content in the seeds was obtained with the applications of 200 and 300 kg N/ha plus 15 kg Mn/ha. The canola seed meals content of glucose inolate decreased significantly with increasing nitrogen rates so that 200 and 300 kg N/ha produced the lowest levels of glucose inolate. The main effects of nitrogen and manganese on the thousand kernel weight index were found to be significant a 1% level. The greatest value for the index of the weight of a thousand seeds was obtained with the application of 200kg N/ha and 15 kg Mn/ha. The largest number of seedpods per plant was obtained with 200 kg N/ha. None of the treatments had any significant effects on the number of plants per unit area. The most favorable protein content, Taking the crop yields and % oil into account, was obtained with a combined application of 200 kg N+15 kg Mn per hectare. Furthermore, the treatment effects were not statistically different for the two varieties.
 
Keyword(s): CANOLA, NITROGEN, MANGANESE, OKAPI, SLM046, % OIL YIELD, GLUCOSE INOLATE
 
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