Effect of Soil Amendment on Clubroot of Crucifers

Abstract

Amendment of soil with S-H mixture at 0.5 and 1% greatly reduced the incidence of clubroot disease on the cultivar Green-Petiole Pai-Tsai of Brassica chinensis. Among various combinations of the components of S-H mixture tested, oyster-shell powder plus mineral ash and mineral ash alone were almost as effective as S-H mixture in reducing clubroot disease. 在土壤中添加0.5%及1%的S-H混合物可有效抑制青江白菜根瘤病的發生，將S-H混合物之各成份以不同組合方式測試，發現蚵殼粉加礦灰皆具有幾乎與S-H混合物相同的防病效果。礦灰中含有CaO、MgO、Al₂O₃、FeO及SiO₂等成份，分別單獨使用前三者皆可降低青江白菜根瘤病根毛感染率。