corn (hybrid bc666) response to supply nutrients from organic nutrition (azotobacter and manure) in climate conditions of lorestan

maize (zea mays l.) is one of the most important crops that used for food, feeding and industrial products and in iran a developing cultivation. in order to study of corn s reactions (hybrid bc666) to supply nutrients to organic nutrition (bacteria and manure) as summer sown in climate conditions of lorestan. an experiment was conduct in meteorology station of lorestan s agriculture research field during 2007 four planting densities as 75000,85000, 95000 and 105000 plant ha-1 in main plots and two amount manure (24 and 30 ton ha-1) set in subplot and application and non application azotobacter chroococcum set in sub-sub plots , were arranged in a split split plot design as base of rcbd. the results indicated that plant densities significally affected biological yield,grain yield and ear number in m2. increase plant densities of 75000 to 105000 plant in per hectare caused 42% addition biological yield,65% addition grain yield and 42% raise ear number in m2 .eventually researches showed in climate conditions of lorestan corn to be able as summer sown to enter rotation cycle. thus corn summer sown planting densities 105000 plant ha-1 is optimum density and application 24 ton ha-1 manure for supply plant nutrients to be enough. in rich soils with fertilizers, not available field for to show beneficial effects bacteria.