Effect of nitrogen and sulphur fertilizers application on yield and some physiological properties of Canola.

To Reduce chemical fertilizers in the fields, present experiment was carried out to investigate the influence of nitrogen as urea (0, 100, 150, 200 kg.ha-1) and sulfur (0, 30, 60, 90 kg.ha-1) fertilizers on yield, yield components of oilseed rape (Brassica napus L.), Hyola 408. The experiment was factorial, laid out in Randomized Complate Block Design (RCBD) with three replicates as a second crop after rice at the Rice Research Institute of Iran, Rasht during 1388 and 1389 (two years). The results showed that the most yield components of canola including seed yield, plant height, noumber of branches per plant and number of pods, nitrogen uptake by grain and stem, seed sulfur content, and grain yield increased with the increase in nitrogen and sulfur fertilizers in two years of experiment. The results showed that the highest percentage of N and S in grain, the highest percentage of S in stem, the highest N/S in grain and stem were in N4S4 treatment, but the highest weight of thousand grains and grain yield were in N1S1 and N4S2 treatments respectively. Second year results also showed that nitrogen rate, plant height, branches per plant, number of branches, number of branches and number of pods, seed nitrogen, stem nitrogen, seeds sulfur content, sulfur content in stem, N / S in shoot biomass, grain yield, efficiency of sulfur, sulfur agronomic efficiency, apparent recovery of sulfur, the efficiency of sulfur capture efficiency of sulfur and sulfur increased harvest index, but with the increase N / S ratio in grains, grain weight, nitrogen use efficiency, nitrogen agronomic efficiency, apparent recovery of nitrogen, nitrogen use efficiency, nitrogen uptake efficiency and nitrogen harvest index decreased. With increasing the amount of sulfur, plant height, grain nitrogen, stem nitrogen, seed sulfur content, stem sulfur content, the N / S stem, seed yield, nitrogen use efficiency, nitrogen agronomic efficiency of nitrogen uptake efficiency increased, but grain weight, biological yield, efficiency of sulfur, sulfur agronomic efficiency, apparent recovery of sulfur and sulfur capture efficiency decreased. Key word: canola, nitrogen, sulphur, fertilizer, yield component, rice field.