The communities of soil microorganisms in relation to the species of field crops
2000
Pieta, D. | Patkowska, E. | Pastucha, A. (Agricultural University, Lublin (Poland). Dept. of Phytopathology)
The experiment was conducted in a growth chamber. Plastic pots were used filled with the soil from the plots of a field experiment after the cultivation of winter and spring wheat potato and soybean. The experiment included 4 cycles of cultivation of plant species mentioned above. At the end of the experiment the number and healthiness of plants were determined and infected plants were submitted to mycological analysis. Besides the rhizosphere soil of the studied plants was taken to determine the composition of soil borne organisms. Repeated plant cultivation caused a great decrease in emergence, and the health of plants became significantly worse. The worst emergence with the greatest proportion of infected plants was noticed during soyabean cultivation in monoculture, whereas the greatest total number of plants with the smallest proportion of infected plants was observed during the combination with winter wheat. Fusarium oxysporum appeared to be the dominant species that infected the studied plants. Additionally, other species of Fusarium and Rhizoctonia solani were isolated from the plants with necrosis symptoms. Microbiological analysis of rhizosphere soil of particular plants showed varying quantitative composition of microorganisms. In the soyabean rhizosphere there was the smallest number of bacterial colonies and the greatest number of fungal colonies in comparison with other studied rhizosphere soils
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