تاثیر کود های بیولوژیک فسفاته ، ورمی کمپوست و تنش خشکی بر عملکرد و سختی بذر یونجه یکساله Medicago scutellata cv. Robinson

In order to evaluate the effects of biological phosphate fertilizers, vermicompost and drought stress on seed yield and seed hardness of annual medic cv Robinson, a split factorial experiment based on completely randomized design with four replications were carried out during 2012-13 growing season in Friedan, Iran. Three factors of this experiment included: biological phosphate fertilizer (Barvar -2) at two levels (non-inoculated and inoculated), vermicompost at three levels: 0, 5 and 10 tons per hectare and drought stress at three levels (mild, severe and normal irrigation). Main factor in this study was assign to drought stress and sub factor was to bio-fertilizers. There were not significant differences between triple interaction effects of vermicompost, bio-fertilizer, barvar-2 and drought stress on grain yield. Mean comparison of treatment showed that the highest seed yield (188 gr/m2) was obtained from S0V2B1 treatment (normal irrigation, 10 tons vermicompost and bio-fertilizer). The main effects of drought stress and barvar-2 bio-fertilizer on seed hardness was significant at 0.01 level, but not for vermicompost on this trait. Severe drought stress and barvar-2 bio-fertilize treatments showed the least seed hardness.