Assessment of Organic Nitrogen Availability to Potato Plant under Affecting Promoting Rhizobacterium and Mycorrhizal Inoculation

The benefits of AMF and GPRB of available N and P t o p o t a t o were examined in pot experime n t containing clay loam soil and fertilized with organic matter. Mycorrhizal colonization of potato plants was over whelmed by bacterial inoculation. Results indicated inoculation with GPRB s trains and AMF increased shoot, root and total dry weight of potato plants s ignifican t ly c ompared with s ingle inoculation with AMF, or Ps. Putida , or B. megatherium or Azosp. Brasilense. Nitro g e n a n d phosphorus uptake were also increased in both s ingle and dual inoculation compared with uninoculated. So synergis tic effect between AMF and GPRB was observed in my c orrhizal root infection. Ps. Putisa inoculation s ignificantly incre a s e d p e rcentage of mycorrhizal infection. Dual inoculation of potato plant with Ps. Putida and AMF improved their growth s ignificantly than other treatments . Generally, the dry matter accumulation, nitrogen and phosphorus uptake by shoots and roots were s ignificantly higher with organic matter by s ingle or dual non-inoculation than inoc u la ted. Similarity, the nitrogen and phosphorus derived from organic matter recovered by shoots were increased by inoculation. These of s o il in c o rp orated with organic matter than in soil non-fertilized. It is worthy to mention that the inoculation of p o t ato with Azospirillum seems to be promis ing and beneficial for enhancing p o tato growth and production. Furthermore, t h e u s e of plant res idues may act as an ideal s low release source of N and P because of its s tability through the period of experiment.