Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Growth, Yield and Nutrient Uptake of Radish as Affected by Amount of Organic Fertilizer in a Volcanic Ash soil

화산회토에서 유기질비료 시용량이 무 생장과 수량 및 양분흡수에 미치는 영향

  • 김유경 (제주특별자치도농업기술원 친환경연구과) ;
  • 조영윤 (제주특별자치도농업기술원 친환경연구과) ;
  • 오한준 (제주특별자치도농업기술원 친환경연구과) ;
  • 강호준 (제주특별자치도농업기술원 친환경연구과) ;
  • 양상호 (제주특별자치도농업기술원 친환경연구과) ;
  • 문봉춘 (제주특별자치도농업기술원 친환경연구과) ;
  • 좌창숙 (제주특별자치도농업기술원 친환경연구과)
  • Received : 2015.10.12
  • Accepted : 2015.11.18
  • Published : 2015.12.31
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Abstract

This study was conducted to determine the effects of organic fertilization rates on the nutrient accumulation and recovery in radish (Raphanus sativus L.) as well as growth and yield of radish in Jeju island. An understanding the relationships between organic fertilization rate, crop nutrient recovery and crop yield can assist in making organic fertilizer recommendation which balances crop value and environmental risk in organic cultivation. Nitrogen (T-N), phosphate ($P_2O_5$) and potassium ($K_2O$) were applied at 0, 115-35-40, 230-70-80 (standard application rate), 460-140-160, 230-200-100 (recommended application rate) and 158-53-35 kg/ha (customary application rate), respectively as the broadcast application of mixed organic fertilizer (N 4.5% - $P_2O_5$ 1.5% - $K_2O$ 1%) in combination with langbeinite ($K_2O$ 22%), 100% at sowing period. The organic fertilizer was made of organic materials like oil cakes. Total yield of radish, as fresh weight of roots, increased with increasing organic fertilizer doses to a maximum at rate of standard or soil-testing application. Nitrogen, phosphate and potassium accumulations of radish increased curvilinearly with increasing organic fertilization rate to a maximum at rate of N 460 - $P_2O_5$ 140 - $K_2O$ 160 kg/ha. However, nitrogen, phosphate and potassium use efficiency of applied organic fertilizer decreased curvilinearly or linearly with increasing organic fertilization rate. Application of organic fertilizer in combination with langbeinite (as a potassium source) had significant effect on the yield of radish. Organic fertilization on a basis of standard or soil-testing application rate is recommended for maximun radish yield in organic cultivation.

본 연구에서는 유기재배시 질소, 인산 및 칼리 비료 시비량에 따른 무의 생육과 수량성, 양분의 흡수량 그리고 투입 양분의 이용율 등을 구명하였다. 처리내용은 무 표준시비량($N-P_2O_5-K_2O$ : 230-70-80)을 기준으로 시비수준을 달리한 T1(무비료), T2 ($N-P_2O_5-K_2O$ : 115-35-40), T3 ($N-P_2O_5-K_2O$ : 230-70-80) 및 T4($N-P_2O_5-K_2O$ : 460-140-160) 처리와, 토양검정에 의한 추천시비량 T5 ($N-P_2O_5-K_2O$ : 230-200-100) 그리고 농가관행 시비량 T6 ($N-P_2O_5-K_2O$ : 158-53-35) 등 6처리를 하였으며 각각의 시비수준에 맞추어 유기질비료의 시비량을 결정하고 부족한 칼리성분은 칼륨비료($K_2O$ 22%)로 보충시비하여 시험을 수행하였다. 무 수량성은 T3 (표준시비량) 및 T5 (토양검정에 의한 추천시비량) 처리구에서 최대수량을 얻었으며 T6 (관행시비량) 처리구 보다 15~23% 증가되었다. 무의 전질소, 인산 및 칼리 흡수량은 시비량이 증가함에 따라 모두 곡선적으로 증가하는 경향을 보였으며 칼리 흡수량이 전질소 및 인산보다 많았다. 그러나 질소 등 투입 양분의 이용율은 시비량이 증가함에 따라 모두 곡선적 또는 직선적으로 감소하였다. 따라서 화산회토에서 무 재배시 유기질비료 시용량은 표준 또는 토양검정시비량을 기준으로 결정하는 것이 보다 안정적인 유기농산물 생산을 위한 적정 시비량으로 판단되었다.

Keywords

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