The Effect of Mycorrhiza and Azotobacter Bio-Fertilizers on Quantitative and Qualitative Characteristics of Rapeseed (Brassica napus L.) Varieties

Abstract

Application of Bio-fertilizers are the most important sustainable strategies for reduction of chemical fertilizers. To study the effect of mycorrhiza and azotobacter bio-fertilizer on quantitative and qualitative characteristics of rapeseed cultivars, a factorial experiment based on a randomized complete block design with four replications were conducted in two temperate and semi temperate regions of Khorramabad and Aleshtar, Iran. The bio-fertilizer application consisted of application of mycorrhiza, application of azotobacter, combined application of mycorrhiza and azotobacter, and non-application of bio-fertilizer as control. Cultivars used in this study were: Gabriella, Nepton, X-Power and Okapi. Results showed that the average seed yields in two locations are 4265.7 and 4168.0 kg.ha-1 in Khorramabad and Aleshtar area, respectively. The highest seed and oil yields, were belonged to Gabriella (4599.7 and 1923.0 kg.ha-1, respectively) and the least to Okapi (3849.6 and 1591.0 kg.ha-1, respectively). The highest seed yield was attributed to the combined application of mycorrhiza and azotobacter (4408.0 and 1831.8 kg.ha-1, respectively) and the least to the non-use of biological fertilizers (3849.6 and 1650.1 kg.ha-1, respectively). As a whole, according to interaction of three factors, Gabriella cultivar with combined application of bio-fertilizers mycorrhiza and azotobacter and X-Power cultivar with azotobacter bio-fertilizer recommended to Khorramabad temperate region and Aleshtar semi temperate region, respectively.