COMPATIBILITY STUDIES OF PSEUDOMONAS FLUORESCENCE ISOLATES WITH COMMONLY USED AGROCHEMICALSP. JAYAMMA, R. SUBHASH REDDY, A. VIJAYA GOPAL AND S. TRIVENI
Pseudomonasis the well known predominant rhizosphere bacteria having novel features in improving plant growth. Pseudomonasdue to their multiple beneficial effects on plant growth and soil fertility, eco-friendly nature, low-cost effectiveness, an attempt was made to identify efficient fluorescent Pseudomonas(PF) isolates with multiple activities, a total of eighteen bacterial isolates were obtained from rhizospheric soils of maize, sorghum, groundnut, chilli, castor and tomato crops. These isolates were biochemically characterized and screened in vitrofor their plant growth promoting traits like phosphate solubilization, production of indole acetic acid (IAA), Hydrogen cyanide (HCN) and siderophore. Due to the production of HCN and siderophores, fluorescent Pseudomonasisolates inhibited the growth of Fusarium oxysporum f.sp. ricini. Out of eighteen, three isolates showing promising PGP traits with biocontrol activity were selected and tested further for compatibility with the commonly used agrochemical viz., fungicides, insecticides and herbicides at recommended and half recommended dosages. Among the three isolates tested, STPF- 14 was found to be highly compatible with all the chemicals at their recommended and half recommended dosages. So the isolate ofP. fluorescens(STPF-14) was evaluated (alone and in combination) under greenhouse conditions for efficacy in suppressing wilt incidence and promoting plant growth in castor.
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