KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effects of Combined Application of Rice Bran and Chemical Fertilizer on the Phytochemical Contents of Rice

  • Kang, Mi-Young (Department of Food Science and Nutrition, Kyungpook National University) ;
  • Kim, Joo-Hee (Department of Food Science and Nutrition, Kyungpook National University) ;
  • Heo, Kyu-Hong (Division of Biosciences, College of Agriculture and Life Sciences, Kyungpook National University) ;
  • Cho, Sun-Shik (Division of Biosciences, College of Agriculture and Life Sciences, Kyungpook National University) ;
  • Esguerra, Manuel Q. (Division of Biosciences, College of Agriculture and Life Sciences, Kyungpook National University) ;
  • Rico, Cyren M. (ISTECH, Inc.) ;
  • Son, Tae-Kwon (Division of Biosciences, College of Agriculture and Life Sciences, Kyungpook National University) ;
  • Lee, Sang-Chul (Division of Biosciences, College of Agriculture and Life Sciences, Kyungpook National University)
  • Published : 2008.12.31
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Abstract

The effect of rice bran (RB) applied alone or in combination with chemical fertilizer at different application rate on the phytochemical and antioxidant properties of rice was investigated. The treatments were 3 levels of RB namely: 200% RB (500 kg $10a^{-1}$), 100% RB (250 kg $10a^{-1}$), 50% RB (125 kg $10a^{-1}$), Recommended fertilizer dose (RF: $N-{P_2}{O_5}{K_2}O$, 11-5.5-4.8 kg $10a^{-1}$) combined with each RB, Half-recommended fertilizer dose (HRF: $N-{P_2}{O_5}{K_2}O$, 5.5-2.75-2.4 kg $10a^{-1}$) combined with each RB, RF and HRF applied at 1, 5, 10 days before rice transplanting (DBT). The parameters investigated were antioxidant, phytosterol and fatty acid contents. Results showed that the antioxidant property and phytosterol contents were high at 10 DBT HRF plus RB, 5 DBT RF plus RB, and 1 DBT 100 and 200% RB. However, total polyphenols increased from 10 to 1 DBT. In the case of fatty acids, no general trend was observed between treatments at different application times. Linoleic acid was high at 10 DBT HRF plus RB while linolenic acid was not affected at different application times. Palmitoeic and oleic acids were not also affected at 5 and 10 DBT. Saturated fatty acids were not also affected by any treatment at different application times except for palmitic acid.Most parameters obtained higher values at 100 and 200% RB treatments in 1 DBT.

2003년에 이상적으로 많이 발생하여 벼에 심각한 피해를 가져온 혹명나방의 재배방법별, 엽록소 함량별 피해실태를 조사하여 피해에 따른 수량반응, 미질변화 등을 구명하고자 조사한 결과는 다음과 같다. 1. 혹명나방의 피해가 심할수록 벼의 등숙비율, 천립중의 감소와 복백립 등 미숙립의 증가에 따른 완전미 비율이 감소되어 완전미 수량이 피해가 심한 곳에서 36% 감소되었다. 2. 혹명나방의 피해가 심할수록 쌀의 외관상 품위가 떨어질 뿐만 아니라 단백질함량이 높아져 식미치는 감소되어 미질이 급격히 저하되었다. 3. 질소질 비료의 시용량이 증가할수록 혹명나방에 의한 피해는 증가하였으며, 특히 주남벼의 경우 질소량이 증가할수록 피해가 급증하였다. 4. 질소 시비량이 추천 시비량인 11 kg/10a를 초과시 피해엽율이 60% 이상으로 급증하였고, 60% 이상 피해를 입은 엽의 비율도 25%이상으로 늘어나 수량 감수 요인으로 작용하였다.

Keywords

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