effect management strategies fertilizer nitrogen and biological on morphological traits, yield and quality traits corn (s.c. 704)

in recent years, surplus usage of chemical fertilizers and inattention the importance organic matter to improve soil fertility, leading to increasing use of chemical fertilizer, environmental pollution and etc. in order to study the different fertilizer levels (organic, chemical and combined) on yield of grain corn (s.c.704) experiment was conducted at the research farm faculty of agriculture tarbiat modarres university 2010 growing season factorial treatment were arranged in manner based on randomized complete block design with three replications. one factor include of the five nutritional systems: 1- (8 ton ha-1 of organic fertilizer), 2- (6 ton ha-1 of organic fertilizer + 46 kg ha-1 nitrogen), 3- (4 ton ha-1 of organic fertilizer + 92 kg/ha nitrogen), 4- (2 ton ha-1 of organic fertilizer + 138 kg ha-1 nitrogen) and 5- (184 kg ha-1 nitrogen) and second factor consisting of: 1- (seed inoculation with free living nitrogen fixation bacteria) and 2- (non-inoculated seed). the results showed that the experimental treatments had a significant effect on the traits measured. maximum leaf area (7.7), grain yield (1000 g m-2), thousand grain weight (213 g) and protein percent (11 percent) of a3 fertilizer level and the highest plant height and biological yield amount 256 cm and 22 ton ha-1 of a4 fertilizer level, respectively. also in seeds inoculated with biological fertilizer measured traits had greater extent than treatment control (no inoculation), so that the leaf area (7.7), plant height (252 cm), grain yield (978 g m-2), thousand grain weight (205 g), biological yield (22 ton ha-1) and protein percent (10 percent) in the inoculated treatments (one). according to the results that obtained the usage from of bio-fertilizers and manure combined with chemical is considered as appropriate procedure for increasing the yield and quality of corn.