Yield, Seed Quality, and Sulfur Uptake of Brassica Oilseed Crops in Response to Sulfur Fertilization

Field experiments were conducted in 2011 in northeastern of Iran, to determine yield, seed quality and S uptake response of Brassica (B.) oilseed cultivar to S fertilization. A total of 30 treatments were tested in a factorial combination of two oilseed crops (B. juncea Canola cv. Sarigol, B. juncea Hayolla cv. and five rates of sulfure fertilizer (0, 10, 20, 30, and 40 kg S ha–1).As a result Hayolla species/cultivars responded positively for seed yield and most other parameters to S fertilizer. Seed yield was usually maximized at the rate of 40 kg S ha–1 for Hayolla species/cultivars. N concentration in seed increased with S fertilization for Hayolla species/cultivars. There was a significant (albeit small) increase of protein concentration in seed due to S fertilization. Sulfur uptake increse in sulfur treatment was not signifigant relative to control. In conclusion, S fertilizer requirements for optimum seed yield were not similar for two B. species/cultivars used in this study, The effects of S applied were more pronounced on Hayolla than Sarigol species by using S, more efficiently.