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질소관비 수준이 래빗아이 블루베리 ‘브라이트웰’의 생장과 양분흡수에 미치는 영향

Effect of Nitrogen Fertigation on The Growth and Nutrition Uptake of ‘Brightwell’ Rabbiteye Blueberry

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주제분류농학

초록

래빗아이 블루베리는 근모가 없는 섬유질 뿌리와 천근적분포로 인하여 양분 이용효율이 낮다. 따라서 본 연구는 래빗아이 블루베리의 생육과 과실특성에 미치는 질소 관비효과를조사하여 효율성 높은 양분관리 기준을 마련하고자 수행하였다. 시험에 사용된 Brightwell(Vaccinium ashei Reade)품종의 관비처리는 재식 년차별 시비기준(재식 1-2-3년: 6-9-14 g/bush)으로 무 질소구와 기준 시비량의 50, 100 그리고200%로 구분하여 처리하였다. 엽중 질소함량은 과중과 수확량에 유의성 있는 정의 상관관계를 나타냈다. 그러나 수관면적, 건물중, 당 그리고 안토시아닌 등은 유의성 있는 상관관계를 나타내지 않았다. 재식 3년차 블루베리의 엽과 줄기 건물중은 각각 723.7 g, 890.7 g/bush을 나타낸 50% 관비처리가 가장 높았다. 재식 3년차 과실수확량은 50%관비구에서가장 높은 12.9 kg/bush으로 무비구 대비 약 70%의 증가량을 나타냈으며, 100%와 200% 관비구에서는 50% 관비구와 비교하여 각각 17와 12%가 감소한 11와 11.5 kg/bush의수확량을 나타냈다. 질소 시비에 따른 이용율은 50% 관비구가 90%로 가장 높았으며, 200% 관비구가 가장 낮은 18%를나타냈다. 따라서 본 연구는 기준 시비량의 50%를 관비하는 것이‘Brightwell’의 생육과 질소의 시비효율에 가장 효과적이었다는 결과를 제시하였다.

Abstract

BACKGROUND: Rabbiteye blueberry(Vaccinium ashei Reade) has lownutrient uptake efficiency due to its shallow and fibrous root system without root hairs. This study was carried out to establish an efficient nutrient application standard by investigating the effect of nitrogen fertigation on the growth and fruit characteristics of rabbiteye blueberry. METHODS AND RESULTS: ‘Brightwell’ rabbiteye blueberry was treated with 0, 50, 100 and 200% nitrogen fertigation of recommended fertilizer application (6, 9 and 14 g/bush in the first, second and third years, respectively). The results showed that leaf nitrogen content significantly correlated with the fruit weight and fruit yield. However, canopy area, dry weight, sugar and anthocyanin contents did not correlate significantlywith the leaf nitrogen content. The leaf and stem dry weights of ‘Brightwell’ rabbiteye blueberry during the third year of plantingwere the highest with 50% nitrogen fertigation (leaf dry weight=723.7 g/bush; stem dry weight=890.7 g/bush). Maximum fruit yield of ‘Brightwell’ rabbiteye blueberry (12.9 kg/bush) was observed during the third year of planting with 50% nitrogen fertigation and thiswas about 70%greater than the treatment that received no nitrogen fertigation. The fruit yields of ‘Brightwell’ rabbiteye blueberry during the third year of planting treated with 100 and 200% nitrogen fertigation were 11.0 and 11.5 kg/bush, and these were 17 and 12%lower than the 50%nitrogen fertigation treatment, respectively. Further, the efficiency of nitrogen utilization was the highest (90%) with 50% nitrogen fertigation and lowest (18%) with 200% nitrogen fertigation. CONCLUSION: The results of this study suggests that fertigationwith 50%of the recommended fertilizer could be most effective for enhancing the growth and nitrogen use efficiency of rabbiteye blueberry.

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