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Effect of macrophomina rhizoctonia fusarium and the mycorrhizal fungus glomus mosseae on nodulated and non nodulated soybeans



Effect of macrophomina rhizoctonia fusarium and the mycorrhizal fungus glomus mosseae on nodulated and non nodulated soybeans



Fitopatologia Brasileira 9(1): 129-138



The effect of G. mosseae on Rhizobium japonicum in the presence of Macrophomina phaseolina, Rhizoctonia solani and F. solani was studied on soybeans in autoclaved soil (91.6 ppm P and pH 6.8) in a greenhouse at 28.degree.-35.degree. C. Root weight was significantly reduced by the 3 pathogens. When G. mosseae was added to the soil, root and shoot weight, and plant height were equal to or higher than the plants receiving Rhizobium alone. The number and weight of Rhizobium nodules were greatly reduced by M. phaseolina, R. solani and F. solani, but increased considerably in the presence of G. mosseae. The percentage of roots colonized by G. mosseae was reduced by the 3 pathogens, but G. mosseae did not significantly affect the root infection or severity of the disease. Total nutrients absorbed by shoots were reduced by M. phaseolina and increased by G. mosseae. The effect of G. mosseae and 3 pathogens on growth response was the same on nodulated and non-nodulated soybean plants, indicating that the presence of R. japonicum nodules did not affect plant response.

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