Efficacy of treating silicate compounds on resistance ability against sheath blight caused by Rhizoctonia solani Kuhn in glutinous rice plants AG

Abstract

Glutinous rice AG is a specialty, creating high economic value for farmers in Mekong delta. In recent years, sheath blight causes severe damage in glutinous rice AG. On this basis, the present study was carried out to evaluate resistance ability of glutinous rice AG after treating several silicate compounds (Si). At first, effect of several Si compounds against sheath blight in glutinous rice AG was performed under net house conditions was conducted, 10 treatments as CaSiO₃-20N, CaSiO₃-50N, Na₂SiO₃-20N, Na₂SiO₃-50N, K₂SiO₃-20N, K₂SiO₃-50N, SLM-20N, SLM-50N, Control-20N and Control-50N. The results showed that treatment of Si at 20 days after growing (DAG) gained good disease reduction at 10 and 20 days after inoculation (DAI), not gained effect on increasing yield and yield elements. Meanwhile, treatment of Si at 50 DAG showed good disease reduction at 30 DAI, quantity of panicle per pot and grain weight per pot. Efficacy of each treatment depends on the kind of Si compounds. The treatment of Si at 50 DAG also inhibited formation of slerotia of R. solani. At field conditions, two treatments of CaSiO₃ and K₂SiO₃ helped glutinous rice plants inhibit sheath blight and gain yield better than treatment of Na₂SiO₃.