Efficiency enhancing of spent mushroom cultivation substrate–derived compost by using actinomycetes to green onion (Allium cepa var. aggregatum) growth and increase defense against phytopathogenic fungi

Abstract

The quality improvement of the spent oyster mushroom cultivation substrate by compost fermentation with Actinomyces isolated from soil surrounding green onion grown on organic planting showed high efficiency on antagonistic to plant pathogenic fungi Sclerotium rolfsii and Fusaruim oxysporum, which were 63 % and 80 %, respectively. At 45 days after fermentation, the obtained compost had the optimum physical properties including dark brown, loosely, pH 8.0 and the optimum plant nutritional including C/N ratio were obtained 16.5, nitrogen, phosphorus and potassium were obtained 0.52, 0.19 and 0.54 %, respectively. In greenhouse experiment, this spent mushroom cultivation substrate derived compost showed more efficiency in plant growth promoting and phytopathogenic fungi defense than the other without the fermentation.