Effect of Applied Amount and Time of Rice Bran on the Rice Growth Condition

쌀겨시용량 및 시용시기가 벼 생육환경에 미치는 영향

  • Kim, Jong-Gu (National Honam Agricultural Experiment Station, RDA) ;
  • Lee, Sang-Bok (National Honam Agricultural Experiment Station, RDA) ;
  • Lee, Kyeong-Bo (National Honam Agricultural Experiment Station, RDA) ;
  • Lee, Deog-Bag (National Honam Agricultural Experiment Station, RDA) ;
  • Kim, Jae-Duk (National Honam Agricultural Experiment Station, RDA)
  • 김종구 (호남농업시험장 식물환경과) ;
  • 이상복 (호남농업시험장 식물환경과) ;
  • 이경보 (호남농업시험장 식물환경과) ;
  • 이덕배 (호남농업시험장 식물환경과) ;
  • 김재덕 (호남농업시험장 식물환경과)
  • Published : 2001.03.30

Abstract

This study was carried out to investigate the effect of application time and amount of rice bran on rice yield, weed occurrence, and chemical change in water as applied at the level of 1.8 Mg/ha (1.8RB) and 3.5 Mg/ha (3.5RB) through field and pot experiment. $Nitrate(NO_3\;^-)$ in the surface water and the percolated water through pot were high in application of 3.5RB, and similar in application of 1.8RB as compared to chemical fertilization. Electric conductivity in surface water were higher by application of rice bran until 25 days after rice bran application. $NH_4-N$ in soil were lower in application of rice bran, and $NO_3-N$ in soil were higher in 3.5RB at tillering stage and panicle formation stage of rice. Rice bran application(3.5RB) showed 68% of weed occurrence as compared to that of chemical fertilization. Rice yield were increased by heavy application of rice bran; 4.41 Mg/ha in 1.8RB and 4.87 Mg/ha in 3.5RB, and top dressing of nitrogen at panicle formation stage caused to increased rice yield by $14{\sim}15%$. Rice yield was also increased by early application of rice bran.

Keywords

rice bran;rice culture;soil properties.