evaluation the effect of the residue management and different nitrogen sources on wheat yield and components

a trial study was carried out to assess the influence of the plant residue management in conjuction with application of different nitrogen sources on wheat yield and components, at the agricultural faculty of shahidchamran university of ahvaz during 2011-2012.the experimental design was splitplot at randomized completed block design arrangement. the main plot were different wheat residue management at three levels(residue moving, residue incorporated to the soil and burning) and the subplot were different nitrogen resources (control, 75 & 150 kg/ha urea, supernitroplus biological fertilizer)snbf and 75 kg/ha urea fertilizer+ snbf. the result showed that the plant residues are able to improve the wheat yield and components. whereas, in most traits, the residue burning increased and the residue moving deceased the most trait. the residue incorporated to the soil was the intermediate treatment. although residue incorporated to the soil had the highest 1000seed weight and harvest index and it had negative effect on biological yield. the highest grain yield (6.6 tone/ha) and the lowest (2.6 tone/ha) were obtained at supernitroplus and residue removing treatment. biological fertilizer application had negative effect and in most traits there was no significant different between biological fertilizer and no nitrogen application (control). whereas the application of biological fertilizer in combined with chemical fertilizer had positive effect and the highest seed number in spike and 1000 seeds was found at biological fertilizer in combined with chemical fertilizer.