지황 ‘토강 ’의 연작 시 근경 잔사물과 토양 훈증처리가 생장 , 뿌리썩음병 및 수량에 미치는 영향
Effect of Rhizome Residues and Soil Fumigation on Growth, Root Rot, and Yield of Rehmannia glutinosa ‘Togang’ in Successive Cropping
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Background: The study aimed to explore the impact of rhizome residues and soil fumigation on the growth, root rot incidence and yield of Rehmannia glutinosa ‘Togang’ during successive cropping. Methods and Results: In mid May 2019, two types of rhizome residues, healthy and diseased, were incorporated as a powder into fresh soil in plastic containers at different concentrations, including 0, 400, 800 or 1,600 g / 200ℓsoil. Additionally, the soil was fumigated with dazomet at 0, 30, 40 and 50 ㎏ per 10 a before planting. For both experiments, the effects on shoot growth, rhi- zome yield and root rot incidence were evaluated. The results show that the presence of rhizome residues in the field, particularly diseased ones, substantially reduced the shoot growth and rhizome yield in R. glutinosa ‘Togang’, along with a slight increase in root rot incidences, with the effect being greater with an increasing amount of the residues incorporated. Soil fumigation with dazomet was able to effectively increase shoot growth and rhizome yield but decrease root rot in ‘Togang’ under successive cropping. The recommended application rate was found to be 40 ㎏ per 10 a, where rhizome yield was substantially increased by about 61%. Conclusion: Soil fumigation with dazomet was quite effective in alleviating the negative effect of successive cropping on shoot growth, yield and root rot in R. glutinosa ‘Togang’, especially when applied at the rate of 40 ㎏ per 10 a.
Abstract
Background: The study aimed to explore the impact of rhizome residues and soil fumigation on the growth, root rot incidence and yield of Rehmannia glutinosa ‘Togang’ during successive cropping. Methods and Results: In mid May 2019, two types of rhizome residues, healthy and diseased, were incorporated as a powder into fresh soil in plastic containers at different concentrations, including 0, 400, 800 or 1,600 g / 200ℓsoil. Additionally, the soil was fumigated with dazomet at 0, 30, 40 and 50 ㎏ per 10 a before planting. For both experiments, the effects on shoot growth, rhi- zome yield and root rot incidence were evaluated. The results show that the presence of rhizome residues in the field, particularly diseased ones, substantially reduced the shoot growth and rhizome yield in R. glutinosa ‘Togang’, along with a slight increase in root rot incidences, with the effect being greater with an increasing amount of the residues incorporated. Soil fumigation with dazomet was able to effectively increase shoot growth and rhizome yield but decrease root rot in ‘Togang’ under successive cropping. The recommended application rate was found to be 40 ㎏ per 10 a, where rhizome yield was substantially increased by about 61%. Conclusion: Soil fumigation with dazomet was quite effective in alleviating the negative effect of successive cropping on shoot growth, yield and root rot in R. glutinosa ‘Togang’, especially when applied at the rate of 40 ㎏ per 10 a.
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