effect of biofertilizers in different levels of nitrogen and phosphorus on yield related parameters of barley (hordeum vulgare)

to study the effects of biofertilizers in their different levels of nitrogen (n) and phosphorus (p) on yield related parameters of barley (sahra cultivar), a split plot experiment based upon a randomized complete block design of three replications was conducted. main plots consisted of: nitrogen at three levels (0, 50 and 100 kg n ha-1 as urea), while sub plots were: phosphorus at two levels (0 and 50 kg p2o5 ha-1 as triple super phosphate). sub sub plots consisted of: biofertilizers at four levels (control, inoculation of phosphate solubilizing bacteria or psm, inoculation of nitrogen fixation rhizobacteria or nfb along with co-inoculation of psm and nfb). results revealed that n, p biofertilizer and interaction of n as well as p were highly significant in terms of all the yield related parameters. mean comparison indicated that increasing of n with inoculation of biofertilizers coud markedly improve grain yield in which maximum grain yield (364.5 gm2) was recorded when the application of 100 kg of nha-1 plus co-inoculation of psm and nfb biofertilizers were involved.