EffectsofNitroxinandplant densityongrain yieldand yieldcomponentsofblack cumin (Nigella sativa)

ABSTRACT:In order to study the effect of nitroxinand plant densityon grain yield and yield components of black cumin (Nigella sativa), an experiment was conducted as factorial experiment in the base of randomized complete blocks design with twelve treatments and three replications at research fieldof AgricultureCompany of Ranin Firouzkuh of iran in 2011. The factors were nitroxin (biofertilizer), mixture of Azotobacter chroococcumandAzospirillum lipoferum in four levels (non-inoculated, inoculated seeds, spray on the plant base at stem elongation stage and inoculated seeds + spray on the plant base at stem elongation stage) and plant density in three levels (12.5, 16.6 and 25 plants m-2). Results showed that the highest plant height, capsule number per plant, grain number per capsule, dry weight of plant and seed yield were obtained by using the biofertilizer twice (inoculated seeds + spray on the plant base at stem elongation stage). plant density, also showed significant effects on studied traits except weight of 1000 grains. The maximum capsule number per plant and dry weight of plant were obtained in12.5 plants m-2 , the highest grain number per capsule were obtained in 16.6 plants m-2 , and The maximum plant height and grain yield were obtained in25 plants m-2.