Research in Plant Disease 2009;15(1):41-45.
Published online April 30, 2009.
벼 깨씨무늬병 발병정도에 따른 논토양, 벼알 및 볏짚에서의 무기성분 비교
예완해, 박양호, 김이열, 탁정순, 남영주, 심홍식, 김용기, 연병렬
Comparisons of Inorganic Amounts in Paddy Field Soil, Rice Straw and Grain with Severity of Brown Spot Caused by Cochliobolus miyabeanus
Wan Hae Yeh, Yang Ho Park, Lee Yul Kim, Jung Soon Taik, Young Ju Nam, Hong Sik Shim, Yong Ki Kim, Byeong Yeol Yeon
In order to study a relationship between soil nutrients and rice brown spot occurrence, paddy field soils, rice grains and straws collected from different paddy fields with different disease degrees of brown spots were analyzed for inorganic nutrients. Brown spot was prevalent in the rice grown in nutrient-deficient soils, which is especially low in macronutrient elements (phosphoric acid, potassium, silicic acids) and micronurients (calcium, magnesium). The soil, however, was high in sodium while organic nutrients and pH level were similar to others. The rice straws with severe brown spot were low in inorganics such as ferrous, copper, T-N, and P2O5 while the rice grains with brown spot were low in ferrous, MgO, Zn, and Mn. In the analysis of field type and nitrogen level, the highest disease severity was found in sandy-type field soil, followed by salty-type field soil and disease severity decreased as application level of nitrogen fertilizer increased. As a summary, the most important factor for effective brown spot control in rice is maintenance of proper nutrients in sandy-type field and control of sodium level in salty-type field soil.
Key Words: Cochliobolus miyabeanus, Rice, Inorganic Nutrient, Paddy Field, Soil

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