Evaluation of Compost Enriched with Useful Microorganisms on Rhizoctonia Canola Root and Crown Rot Control

摘要

Canola root and crown rot caused by Rhizoctonia solani K黨n are among the most damging Canola diseases all over the world. Various measures have been taken to control and reduce the amount of damages. The current research evaluates the impact of a number of useful microorganisms added to compost on reducing the diseases and improving Canola抯 seedling growth. First, an in vitro test was performed to examine antagonistic potential of 88 strains of microorganisms in dual culture and volatile. The microorganisms are: Pseudomonas fluorescens aillus subtilis richoderma harzianum and Talaromyces flavus. The obtained results showed that most of the microorganisms significantly reduce R. solani growth. In the end, nine top microorganisms (Pf.5 f.9 f.13 f.21 f.24 s.19 r.3 f.38) are selected for greenhouse experiments. In this experiment, with completely random design, combined effect of compost and useful microorganisms suspension on plant growth and disease is evaluated in four replicates among 18 samples (8 samples include not-composted suspended microorganisms, 8 samples include composted suspended microorganisms, 1 control sample, and 1 infected sample). The samples are tested in terms of germination rate, seedling infection rate, and root and shoot dry weight. Our findings indicate that all composted microorganisms no only significantly reduced damping-off, but also improved seedling growth to even more than control sample.