Responses of some canola varieties, Brassica napus L., to nitrogen fertilizer levels under different sowing dates in a new reclaimed soil
2011
Asfour, M.M.
The present study was carried out to investigate the influence of sowing dates and nitrogen fertilizer levels on yield of five canola varieties in a new reclaimed soil. The experiment took place at the experimental farm of the Environmental Studies and Research Institute Minufiya University, Sadat City Egypt during 2007/2008 and 2008 /2009 seasons. Complete block design with spilt split plot with three replications was used. Where the main plots included four sowing dates (15 October, first November 16 November first December). The sub -plots contained three nitrogen fertilizer levels (30, 60 and 90 Kg N/fed). The sub - sub plots were assigned to five canola varieties (Sedo, Duplo, Serw - 4 Pectol Drakkar). The results indicated that the first of November was the best sowing date it gave the highest values of all the studied traits and the highest seed yield per plant (43.76 and 48.94 g )in both seasons. Best nitrogen fertilizer level was 90Kg N/fed. It scored the highest mean values (45.20 and 46.92g)of seed yield per plant. Serw-4 gave the highest seed yield (64.63 and 71.56g) in both seasons respectively. Serw-4 had the best response for nitrogen fertilizer especially when planted at 1 November and gave the highest seed yield(87.97 and 99.98 g / plant) followed by Duplo variety(75.57 and 93.90 g)/ plant in both seasons respectively. Sowing date at the first of November with 90Kg N per fed. were recommended for maximizing seed yield in new reclaimed soils with poor content of available nitrogen. Serw - 4 and Duplo were the best varieties under the conditions of this study.
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