Effect of addition of vermicompost, bio and mineral fertilizer on the availability of some nutrients in soil and potato yield

الملخص EN

A nitrogenous bio-fertilizer comibination was prepared contain Azospirillum lipoferum, and Azotobacter chroococcum bacteria.

A phosphate bio-fertilizer consisting of Bacillus megaterium and Glomus mosseae fungus was also prepared.

vermicompost was produced from earthworms imported from Iran and others isolated locally.

A factorial experiment was carried to evaluate the effect of the interaction between these combinations and vermicompost types under levels of 0 % , 25 % and 50 % of NPK.

The results showed a significant superiority of the bio-fertilizer (nitrogen and phosphate) treatment in available nitrogen in the soil after harvest, number of tubers, yield per plant, and the total yield with 39.70 mg N kg -1, 11.03 tuber plant -1, 1367.40 g plant-1, and 43.76 Mg ha-1 respectively.

While phosphate bio fertilizer treatment giving available phosphorus in the soil by 22.74 Mg P kg -1, vermicompost produced from imported earthworms was superior in giving available phosphate in the soil with value 22.74 mg p kg -1.

While the tri interaction was superior for all studied characteristics.