Two field experiments were conducted at Nubaria Agric. Res. Station during
1999 and 2000 seasons to investigate the eHeet ot two plant densities (10 15 cm
between hills i.e. 32 and 22 plantslm²) and six fertilization treatments: 1) control -
uninoculatlon + no nitrogen fertilizer, 2) inoculation + no nitrogen ertiiizer; 3)
inoculation + 30 kg Nlfed; 4) inoculation + 60 kg Nlfed; 5) inoculation + 90 kg Nlfed,
and 6) uninoculation + 90 kg N/fed, as well as their interactions on soybe n yield and
its components. The obtained results showed that increasing the distance bet een plants
significantly decreased seed yield/fed and plant height and increase number of
seeds/plant. All studied characters were significantiy Increased by increas ng nitrogen
fertilizer levels. The economic treatment was obtained by inoculation + 30 g Nlfed for
all studied characters with 32 plantslm²• In the same time, this treatmen save 60 kg
Nlted as compared with 90 kg Nlted + Inoculation.