Effect of soil solarization on Fusarium oxysporum f sp Carthami populations in endemic soils
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Authors
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R. KALPANA SASTRY and C. CHATTOPADHYAY
Directorate of Oilseeds Research, Rajendranagar, Hyderabad 500 030
Keywords:
Soil solarization, Fusarium oxysporum, soil populationAbstract
Effect of soil solarization on F. oxysporum f.sp. carthami populations in endemic safflower soils was studied in summer 1995 in a split-split plot design experiment. Transparent polyethylene sheet covered plots with different combinations of irrigation and ploughing treatments, for varying periods up to 6 weeks, maintaining appropriate controls were used. It was observed that soil temperature at 5 cm depth varied widely among the different treatments. In the irrigated-ploughed-solarized combinationit had a maximum average of 52.5deg C over 6 weeks of solarization compared with 44.4deg C in the control. Soil population of Foc in the irrigated-ploughed treatment was reduced to non-detectable levels after 6 weeks of solarization, whereas the effect on theTrichoderma population was meagre. There was a significant rise in populations of soil actinomycetes and fluorescent pseudomonad bacteria.
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