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A field experiment was conducted in sandy loam soils of eastern farm, Agricultural Engineering College and Research Institute, Kumulur, Tamil Nadu, India to study the effect of silicon on yield and uptake of rice (var. BPT 5204) during Kharif season of 2010-11 by taking the treatment combinations based on graded levels of Fly Ash (FA), Silicate Solubilizing Bacteria (SSB) and Farm Yard Manure (FYM) at fixed fertilizer schedule. The experimental soil (0-15 cm) had pH 7.22; organic C 1.4 %; available Si 66.0 mg kg-1; available N 266.0 kgha-1; available P 14.42 kgha-1 and available K 107.50 kgha-1. The results of graded levels of FA show that all the growth and yield attributes were significantly influenced by silicon uptake. The mean silicon uptake at panicle initiation, straw and grain at harvest varied from 53.8 - 98.7, 105.5 - 197.2 and 21.4- 62.3 kgha-1 respectively, in rice. Number of filled grains per panicle and grain yield displayed conspicuous relationships with content of Si in grains. The highest mean grain yield of 3622 kg ha-1 was recorded by the addition of SSB+FYM followed by FYM (3530 kg ha-1), SSB (3310 kg ha-1) and control (3240 kg ha-1). The combined application of 25 t ha-1 FA with SSB+FYM was recorded the highest grain yield of 3710 kg ha-1 which was 16.3 per cent moreover yield of control. The results further show that 25 t ha-1 FA and SSB+FYM have been proved to be superior treatments for best management of silicon in coastal loamy sand soils under irrigated rice ecosystem.

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Field experiments were conducted to investigate the effect of graded levels of fly ash with silicate solubilizing bacteria (SSB) and FYM on the incidence of rice stem borer (Scirpophaga incertulas) (Lepidoptera: Pyralidae) in rice crop in low and high Si soils under Split Plot Design. The graded levels of fly ash incorporated in soil at five levels (0, 25, 50, 75 and 100 t/ha) one week before crop transplantation. The results of field experiment in low Si soil showed that fly ash had significant influence on the stem borer population over the control. On an average, with respect to borer incidence, higher dose of fly ash @ 100 t ha -1 markedly decreased infestation (16.9 %) while, applications at 25 and 50 t ha -1 permitted slightly more dead hearts incidence, but differed significantly from control. In main plot treatments, application of SSB + FYM recorded 16.1 per cent of stem borer incidence. Application of fly ash @ 100 t ha -1 with SSB + FYM reported less per cent of dead hearts. In high Si soil, the effect of main treatments and interaction effect was non-significant. However, application of fly ash @ 100 t ha -1 had significant effect with meagre pest incidence of 11.6 per cent. Besides application of SSB and SSB+FYM alone played a major role in maintaining ETL of stem borer. The present study implies that due to suppressive effects of Si and K present in fly ash the incidence of the rice stem borer mitigated at crop vegetative stage and the use of soil incorporation strategy can create an unfavourable condition for pests to survive.How to view point the article : Pedda Ghouse Peera, S.K., Balasubramaniam, P. Raghavendra Reddy, M. and Chandramani, P. (2016). Effect of silicate solubilizing bacteria and fly ash on the incidence of stem borer (Scirpophaga incertulas) (Lepidoptera: Pyralidae) in rice. Internat. J. Plant Protec., 9(1) : 183-186.