evaluation of biological fertilizers and micronutrient elements effects on yield and some agronomic traits in rapeseed (brassica napus l.)

in order to evaluate of biological fertilizers and micronutrient elements effects on yield and some agronomic traits in rapeseed (brassica napus l.), an experimental was performed as factorial arrengement based on randomized complete blocks design with three replications in 2012-13 in research station of shahid chamran university of ahvaz, iran. in this experiment, micronutrient elements were in six levels: (no utilizing of fertilizer as check, sulphat (2 and 4 ml.lit1-), iron sulphat (2 and 4 ml.lit1-) and combination of zinc and iron fertilizers (2ml.lit1-)) and biological fertilizers : (non-inoculation, seed inoculation with thiobacillus and nitrocara + thiobacillus bacteria with sulfur. the results showed that the combined use of thiobacillus and nitrocara 9 to 32% compared to non use of biological fertilizer and also concurrent spraying of zinc and iron were between 15 to 50 improved the studied traits. but, concurrent use of bio-fertilizers and micro nutrients, increased positive affect of the studied traits such as weight of pod, grain weight in a pod, day to, biomass yield, grain per pod and grain yield, the value of (4 ml.lit1- iron and zinc) had a greater impact on the studied traits. sounds like biological fertilizers can be suitable alternative to chemical fertilizer and increase the yield of rapeseed too.