EFFECT OF ADDITION OF VERMICOMPOST, BIO AND MINERAL FERTILIZER ON THE AVAILABILITY OF SOME NUTRIENTS IN SOIL AND POTATO YIELD

Abstract

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.