INTERACTION OF PSEUDOMONAS FLUORESCENCE BACTERIA AND PHOSPHORUS ON THE QUANTITATIVE AND THE QUALITATIVE YIELD OF RAPESEED (BRASSICA NAPUS L.) CULTIVARS

Canola (Brassica napus L.) is a very important crop. Hence, the effects of chemical and biological fertilizer on canola oil production and nutrient uptake, under calcareous conditions, were evaluated in a field experiment. The experiment was carried out in factorial in a randomized complete blocks design with three replications in Babolsar, Iran in 2010 and 2011. The bacterial inoculation factor comprised the following five levels: Pseudomonas fluorescence I (PSf(1)), Pseudomonas fluorescence II (PSf(2)), Pseudomonas putida I (PSp(1)), Pseudomonas putida II (PSp(2)), and control treatment (PS0) The triple superphosphate fertilizer factor comprised the consumption of triple superphosphate fertilizer based on the soil test (P-1), the consumption of triple superphosphate fertilizer based on 25 % less than the soil test (P-2), the consumption of triple superphosphate fertilizer based on 50 % less than the soil test (P-3), and control treatment (P-0) as well as the cultivars Hayula 401 and Sarigol. Results showed that the use of growth-stimulating bacteria had increased the seed yield, biologic yield, 1,000-seed weight and shoot, and grain phosphorus concentratio of canola cultivars. The highest seed yield belonged to the Pseudomonas putida II bacteria, with an average of 3,587 kg ha(-1) and 17.4 % edge in comparison to the control group. The highest seed yield, with an average of 3,711 kg ha(-1), which showed a 30 % increase in comparison to the control treatment, was obtained in the treatment of 25 % less phosphorus than the soil test. In the most investigated qualities, Hayula 401 excelled Sarigol, and the consumption of biologic fertilizers, as the complements of chemical fertilizers, increased the yield and yield components, and improved the phosphorus content of the leaf and the grain.