Abstract: During two summer seasons in Egypt, pots experiments were carried out at 2004 and 2005 seasons
in order to investigate the effect of application of organic manure, biofertilizer and yeast (Candida tropicales)
on growth, yield and seed quality of soybean (Glycine max L.). The results indicated that application of organic
manure at a rate of 20 ton / acre as a sole treatment and also when it associated with biofertilizer as one
treatment had more plant height and dry weight / plant. On contrast plant height was reduced at the treatment
had a sole biofertilizer and also when it associated with yeast, also number of branches / plant was decreased
at the treatment received bio. or yeast singly. Seed yield (g. / plant), pods weight (g. / plant), as well as, number
of pods / plant, seeds / pod and 1000-seed weight were decreased by adding biofertilizer singly, but when it
associated with organic manure showed the highest seeds and pods weights. Application of organic
manure+yeast as one treatment resulting in an increase in yield and yield attributes of soybean plants. Seed
oil % was increased at the plants that treated by biofertilizer singly and also at the treatment received organic
manure+yeast as one treatment, whereas protein % was increased at the treatment had organic singly or when
it associated with biofertilizer, then this increase in protein percentage due to the increase in N% at the same
treatments. P concentration was only increased at the plants received yeast only and also when yeast
associated with biofertilizer. Zn concentration tended to increase at the plants treated by bio.+organic
manure+yeast followed by bio.+organic as one treatment. Mn concentration was high when plants received
yeast singly or when it associated with biofertilizer, while Fe concentration tended to increase due to adding
bio.+organic manure+yeast followed by bio.+organic as one treatment.