Sangeetha Panicker, V. Vijayageetha and R. Vaidyanathan
Oilseeds Research station- Tindivanam 604002, Tamil Nadu- India
Potassium solubilizing bacteria are rhizosphere microorganisms that solubilizes the insoluble potassium (K) to soluble form. According to Buchholz and Brown (1993) more than 98% of potassium in soil exists in the form of silicate minerals and can be released on weathering. One such organism is Bacillus mucilagenosus. Several studies have shown the important role played by Si in plant growth. They not only triggers natural defense in plants but reduces pest and diseases and increases production and productivity. Hence the present study was carried out to identify a suitable silicate and potassium source for groundnut (Arachis hypogaea). In this study different silicate sources like calcium silicate, sodium silicate and potassium silicate were tested and compared with Bacillus mucilagenosus in controlling diseases. It was found that B. mucilagenosus not only reduced diseases like root rot by 37.06% rust by 39.52% and late leaf spot by 38.6%, it also increased yield to 2.09 t/ha compared to 1.19 t/ha in control.