Department of Plant Sciences

Two field experiments were carried out at the Agricultural Experimental Station of the National Research Center at Shalakan, Qalubeia Governorate, Egypt, during the two successive winter seasons of 2005/2006 and 2006/2007 to study the response of some canola varieties (Topas and Pactol cvs.) to nitrogen fertilizer levels (20, 40 and 60 kg N/faddan, (faddan = 4200 m2)) and number of zinc foliar application, one zinc foliar application (rosette stage) or two zinc foliar applications (rosette and bud stages). Concerning varitial differences, the obtained results illustrate that no significant differences between both varieties on the most studied characters, except for plant height and seed yield/faddan where, Pactol superior in plant height, 1000-seed weight, seed yield /plant, seed yield /faddan and oil yield /faddan. Increasing nitrogen fertilizer from 20 to 60 kg N/faddan significantly increased plant height, number of siliqua/plant, seed yield /plant, seed yield /faddan and oil yield/faddan. Most of studied characters were significantly increased by increasing number of zinc foliar application where, two zinc foliar application significantly affected in plant height, number of siliqua /plant, seed yield/ plant, seed yield /faddan and oil yield/faddan. The interactions between different factors show significant differences in the most studied characters.