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Soil Mineral Nutrients and Microbes Are Responsible for Large Patch Disease Caused by Rhizoctonia solani AG2-2 in Zoysiagrass Turf  

Chang, Tae-Hyun (Department of Plant Resources, College of Life Science and Natural Resources, Sangju National University)
Ru, Yeon-Ju (Department of Bioindustry, College of Life and Environmental, Daegu University)
Lee, Yong-Se (Department of Bioindustry, College of Life and Environmental, Daegu University)
Publication Information
Asian Journal of Turfgrass Science / v.21, no.2, 2007 , pp. 113-126 More about this Journal
Abstract
Mineral nutrients and population dynamics of soil microbes in the root zones of zoysiagrass infected by Rhizoctonia solani AG2-2 and that of healthy plants were sampled from ten golf courses using a cup cutter(diameter $10\;cm\;{\times}\;8\;cm$ deep). Analysis of variance(ANOVA) showed significant differences in content of $NO_3$-N(P = 0.05), $NH_4$-N(P = 0.1), and K(P = 0.1) between infected and healthy samples. The content of $NO_3$-N in the soils of large patch was 9.49 mg/kg and that in soil of healthγ plants was 7.02 mg/kg. However, the content of $NH_4$-N in the soil of large patch was 12.02 mg/kg whereas 14.40 mg/kg for the soil under the healthy plants. The content of K in the soil of large patch was lower than that of soil of healthy plants. There was few numbers of Pseudomonas colonies In the soils of large patch compared to that of healthy plants. These results indicated that the content of $NO_3$-N, NH4-N, and K and the microbial population dynamics in root zones correlated to occurrence of large patch.
Keywords
nitrate; ammonium; pseudomonas; rootzone; zoysiagrass;
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