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Effect of organic and bio fertilizers (Azotobacter and phosphate solubilizing bacteria) on production of potatoes and some soil properties was studied in Tartous. The experiment consisted of 4 treatments (control soil, soil+manure, soil+ bioferti lizer and soil+manure+biofertilizer) each replicated four time, for 2004 and 2005 seasons. Total N, available P, available K, and organic matter in soil were determined. Significant increases were observed in most of the inoculated and organic fertilized treatments compared with the control. However, the treatment (soil+manure+biofertilizer) was the best and showed significant increases in potato yield compared with other treatments especially in the next season. However, the second season was better in yield increase in all treatments than the first seacon.
A field experiment was carried out during 2002 at Al-Husainea - Deer Al- Zour to study the effect of PSB (Pseudomonas) or PSB combined with 50%, 25%, 100 % of the recommended phosphorus (P2O5) mineral fertilizer without inoculation on cotton produ ctivity, phosphate uptake . Significant differences in available phosphate were noticed in comparison with the control. These microorganisms were effective in solubilizing of fixing phosphate in soil and fixing phosphate, added to the soil as superphosphate. Significant increasing in cotton yield of inoculating treatments was noticed in comparison with the control.
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