3.6.10
SILICA NUTRITION AND RICE BLAST RESISTANCE

S KARPAGAVALLI and R RANABADRAN

Plant Pathology Department, Faculty of Agriculture, Annamalai University, Annamalainagar 608 002, Tamilnadu, India

Background and objectives
The application of silica in soil causes rice plants to absorb and accumulate silica in the epidermal and bulliform cells, which offers resistance against blast disease [l]. Lignite fly ash consists of a significant amount of silica and also other elements. Application of fly ash might therefore confer ressistance in the host plant. Hence, the present study was taken up to find out the influence of lignite fly ash application on blast disease of rice.

Materials and methods
A field trial was conducted with various levels of application of lignite flyash: 0, 2000, 4000, 6000 and 8000 kg/ha, to study the disease incidence, yield parameters and silica-nitrogen interaction in disease resistance.

Results and conclusions
The application of lignite fly ash reduced blast disease incidence by Pyricularia oryzae and increased the yield parameters. Plants to which fly ash had been applied recorded higher silica content and reduced nitrogen content in leaves.

References
1. Adyanathayan NR and Rangaswami G, 1952. Madras Agr. Journal 39, 198-204.