Abstract
In order to investigate the effect of nitrogen (N) and sulfur (S) fertilizers on yield and seed quality of three canola cultivars, a factorial based on randomized complete block experiment was conducted during 2005–2006 in Iran. Treatments included four nitrogen rates (0, 75, 150, and 225 kg N ha−1 source of urea), four sulfur rates (0, 100, 200, and 300 kg S ha−1), and three cultivars (‘Pf’, ‘Option-500’, and ‘Hyola-401’). Results indicated cultivar had a significant effect on all studied traits. ‘Option-500’ and ‘Hyola-401’ cultivars had the highest seed yield, protein content, and N:S ratio in seed. The levels of 150 and 220 kg N ha−1 resulted in the maximum protein content. Increasing N levels resulted in N content and decreased the oil content. The interaction effect between S and N levels showed the highest N content in seed was obtained with 300 kg S ha−1 and 225 kg N ha−1.
ACKNOWLEDGMENTS
The financial support of Sari Agricultural Sciences and Natural Resources University and Agriculture Research Station of Baye-Kolah (Mazandaran) and help of Mr. M. Mahmoudi, Mr. Aziz Zade Firozi, and Mr. Bahrololom is kindly acknowledged.