Research in Plant Disease 2008;14(3):193-200.
Published online December 30, 2008.
달걀껍질이 배추의 생육과 무사마귀병 발병억제에 미치는 영향
김병관, 임태헌, 김윤희, 박석환, 이상화, 차병진
Effects of Eggshell Powder on Clubroot Disease Control and the Growth of Chinese Cabbage
Byeong Kwan Kim, Tae Heon Lim, Youn Hee Kim, Seok Hwan Park, Sang Hwa Lee, Byeong Jin Cha
Blending of eggshell powder into soil as ratio of 1:5, 1:10, 1:15, 1:20, and 1:25 did not affect seed germination rates of several crops including Chinese cabbage. The blending increased pH of distilled water and decreased the viability of resting spores of Plasmodiophora brassicae. The ratio of non-viable resting spores in eggshellblending water was over five times higher than in distilled water of the same pH. Chinese cabbage (cv. ``Norangbom``) grew more in eggshell-blended soil than in non-treated soil, but other crops grew less. Leaf numbers and above ground growth of Norangbom increased to around 150% and 470%, respectively, in soil blended with 1:20~1:15 of eggshell powder. Even though the optimum sizes of eggshell powder were 0.8~2.0 mm for growth and smaller than 0.4 mm for inhibition of clubroot disease of Chinese cabbage, there was no statistical difference among the sizes. Soil pH was above 8.0 in all eggshell treatments without any statistical difference among them. Eggshell powder blending to 1:20 showed lower control efficacy, 58.5%, than registered fungicide ``Hokanna (flusulfamide)``, 78.5%. However, Chinese cabbage of that blending ratio recorded the highest growth among the treatments. Therefore, blending of eggshell powder into clubroot-contaminated soil may make culture of Chinese cabbage possible by growth-increasing, even though eggshell powder could not inhibit clubroot disease entirely.
Key Words: Chinese cabbage, Clubroot, Control, Eggshell, Plasmodiophora brassicae

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