Impact of plant growth promoting microorganisms as a biofertilizer on enzymes activity and vegetative criteria of tomato crop

Abstract EN

Tomato plants were inoculated with microorganisms PGPM Azotobacter chroococcum (A.

Z), Bacillus megaterium (B.

M), Bacillus circulans (B.

C) and Trichoderma viride (T.

V) to study their effect on some enzymes activity and plant growth parameters under greenhouse conditions as compared with untreated sample.

Antagonistic effects of the isolated microorganisms against F.

solani and R.

solani were also studied.

The growth inhibition percent of B.

megaterium is always higher than those reported for B.

circulans and much higher than A.

chroococcum and B.

megaterium is more efficient than the other strains in F.

solani inhibition process.

Percentages of growth inhibition of R.

solani by B.

circulans after 5 and 7 days are higher than those reported for tested strains.

Significant increase were found in dehydrogenase (DHA), phosphatase (PA) and Nitrogenase (N₂-ase) activities in treatments that inoculated with plant growth promoting microorganisms (PGPM) strains under either infestation with F.

solani or R.

solani compared with non-infected one.

Plant height was differed significantly at 30, 60 and 90 days after planting (DAP).

The plant height increased continuously from 30 DAP to 90 DAP in all the treatments of both with and without compost.

Among the treatments with compost was found to be significantly superior over without compost treatments in respect of plant height at all stages.

The highest values of tomato fresh weight /plant were found in samples inoculated with (Mix) + compost (695.12) followed by Mix + without compost (639.33).

The lowest values of fresh weight/plant g were recorded in control sample (381.67).

The dry weights/plant (g) of tomato were found in sample inoculated Mix (136.14) followed by sample inoculated with T.

viride + A.

chroococcum