In this study, synthetic and biological soil conditioners were used to screen their
abilities to improvise the barren soil characters. These soil conditioners based on
treatment of barren soil samples with urea and / or compost as synthetic soil conditioner
or by inoculating the soil samples with Spirulina meneghiniana Zanrd. ex Gomon and / or
Anabaena oryzae Fritsch as a biological soil conditioner. The data revealed that, the
biological conditioner in a mixture (22.5 kg ha-1 Anabaena and 22.5 kg ha-1 Spirulina
supplied with 7.5 kg ha-1 urea and 7.5 kg ha-1 compost) was the most effective one. Also,
the soil samples inoculated with this mixture exhibited positive activity of improving soil
characters. Moreover, highly significant positive responses of the development features
were appeared on lettuce plants transplanted in such soil samples.