• Title/Summary/Keyword: Yeongnam area

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Effects of Damage by Brown Planthopper at Ripening Stage on Yield and Quality of Rice (벼 등숙기 벼멸구 피해가 수량 및 품질에 미치는 영향)

  • Lee, Jong-Hee;Yeo, Un-Sang;Kwak, Do-Yeon;Kim, Joon-Hwan;Song, Yu-Cheon;Kim, Choon-Song;Shin, Moon-Sik
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.51 no.spc1
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    • pp.73-76
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    • 2006

  • This study was carried out to investigate the change yield and grain quality in rice caused by damages of brown planthopper (Bph) on major agronomic traits at the ripening stage. A major agronomic traits such as culm length, panicle length, number of panicle and number of grain per panicles was no-significant difference compared hopperburn area (HBA) and moderately damaged area (MDA) by brown planthopper with non-damaged area (NDA). but, the ripeing ratio and yield in HBA and MDA was significantly decreased. The perfect rice of brown rice in HBA and MDA was also lowered than the NDA and the immatured grain among imperfect rice in damaged area by BPH was significantly increased than in the NDA. Among the traits related with palatability of cooked rice, the amylose content was not affected by damage of brown planthopper, whereas, the protein content was significantly increased in the HBA and MDA. additionally, Peak viscosity in HBA and MDA is lower than the NDA, and setback was increased. In most cases, there was negative on yield and grain quality by the damage of brown planthopper at the ripening stage. Thus, the rice product harvested in damaged area should be separated with that in non damaged area for grain market quality of milled rice.

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Evaluation of Optimum Rice Heading Period under Recent Climatic Change in Yeongnam Area (기후 변화에 따른 영남지역의 벼 출수적기 평가)

  • Kim, Choon-Song;Lee, Jae-Saeng;Ko, Jee-Yeon;Yun, Eul-Soo;Yeo, Un-Sang;Lee, Jong-Hee;Kwak, Do-Yeon;Shin, Mun-Sik;Oh, Byeong-Geun
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.9 no.1
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    • pp.17-28
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    • 2007

  • This study was conducted to analyze the optimum heading period according to the recent climatic change for improvement of rice yield and grain quality in the Yeongnam area. We analyzed climatic elements including daily mean air temperature, daily range of air temperature, sunshine hours, and amount of precipitation from 1996 to 2005 in comparison with those of the 1971 to 2000 normal. Daily mean air temperature and amount of precipitation in the recent 10 years increased, but daily range of air temperature and sunshine hours decreased in comparison with the norm. Also, monthly mean air temperature was lowered remarkably in July and August. The monthly amount of precipitation largely increased in August and September. The daily range of air temperature and sunshine hours were greatly decreased from August to October, Possible cultivation periods for rice in the recent 10 years ranged from 171 days in Boughwa to 228 days in Busan and was expanded about $1{\sim}13$ days in comparison with the normal. Optimum heading date by local regions for the maximum climatic yield potential was estimated as July 31 at Bonghwa to September 7 at Busan, Masan, and Tongyeong in the recent 10 years. There was a wide difference in optimum heading date according to local legions of the Yeongnam area. Compared to the normal, optimum heading date in the recent 10 years was delayed about I~8 days in most local regions except Bonghwa, Mungyeong, and Yeongdeok. These results suggested that it is necessary to develop late maturity rice cultivars for producing high yield and quality rice grain due to the recent climatic change. Moreover, it is still more important to select the most suitable cultivation period appropriate to the changed climate of each local region in Yeongnam area.

  • https://doi.org/10.5532/KJAFM.2007.9.1.017 인용 PDF KSCI