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질소원의 혼용비율에 따른 ‘신고’ 배 실생묘의 생육, 질소축적, 질소환원효소의 활성 변화
金松南(Song Nan Jin),최동근(Dong Geun Choi) 한국원예학회 2006 원예과학기술지 Vol.24 No.1
This study was conducted to investigate the effect of four different NH₄?:NO₃? ratios (200:0, 100:100, 50:150, and 0:200 ㎎ㆍℓ?¹) in nutrient solution on growth, the nitrogen concentration of various organs, and in vivo nitrate reductase activity (NRA) in pear (Pyrus pyrifolia cv. Niitaka) seedlings in sand culture. Nutrient solutions used in this experiment were adjusted to pH 6.5 and trickle?irrigated 3 times a day, having nitrogen concentration of 200 ㎎ㆍℓ?¹. Tree height and dry weight of seedlings were restricted when NO₃? was the sole nitrogen source in the nutrient solution but there was no significant difference among other NH₄?:NO₃? ratios. The concentrations of nitrate?N in leaves and stems were increased with increasing the NO₃? ratio in the nutrient solution, but that of root was not affected. The concentrations of total and reduced nitrogen in leaves and stems increased with increasing the ratios of NH₄? in nutrient solution, but those in roots were insignificantly changed. In vivo ?NO₃? NRA of all organs was not related to the NH₄?:NO₃?ratios, whereas the in vivo ?NO₃? NRA of all organs increased with increasing the ratio of NO₃? in all the organs except roots where it decreased. The nitrate reduction occurred in various organs of pear seedlings. Growth and NRA were higher in ammonium or nitrate alone than combined application. Results showed that recommendable NH₄?:NO₃? ratio for the nutrient solution in pear is 50:150 ㎎ㆍℓ?¹.
질소 시용수준에 따른 배 ‘신고’ 실생묘의 생육과 질소관련물질의 변화
金松南(Song Nan Jin),최동근(Dong Geun Choi),강인규(In Kyu Kang),한광수(Kwang Soo Han),최철(Cheol Choi) (사)한국생물환경조절학회 2006 시설원예‧식물공장 Vol.15 No.1
‘신고’ 실생을 대상으로 질소사용수준에 따른 생장 반응을 조사하고 질산환원효소 활성 측정을 통해 수체내에서의 질산 환원상태를 어느 정도 예측할 수 있는 지 알아보기 위하여 시험을 실시하였다. 사경시험에 사용한 영양액은 암모늄태와 질산태질소의 비율을 1:3으로 하고 질소농도를 100, 200, 400 및 600㎎ㆍL¹의 4가지 수준으로 하였고, pH를 6.5로 조절한 후 포트당 3L씩 l일 3회 점적 관수를 실시하였다. 생육 중 수고와 건물중 모두 질소시용수준을 100과 200㎎ㆍL¹로 하였을 때가 400과 600㎎ㆍL¹에 비하여 유의하게 높고 무거웠으나 100과 200㎎ㆍL¹의 처리간에는 큰 차이가 없었다. 질소의 시용수준이 600㎎ㆍL¹일 때에는 질소 과잉 공급으로 신초 생장이 극히 불량하였다. 질 산태질소의 함량은 잎과 뿌리의 경우 조사시기에 따라 질소 시용 효과가 서로 다른 양상을 보였으나 줄기의 경우는 질소시용농도의 증기에 따라 증가하였다. 부위 별 전질소와 환원 질소의 함량은 처리 후 경우는 질소시용농도의 증가에 따라 증가하였다. 부위 별 전질소와 환원 질소의 함량은 처리 후 30일 경우 질소시용농도의 증가에 따라 증가하였으나 처리 후 60일과 90일에는 질소 시용 효과가 뚜렷하지 않았다. 기관별 in vivo(+NO₃?) NRA는 질소의 시용농도와 큰 관련이 없었으나 in vivo(-NO₃?) NRA는 뿌리를 제외한 잎과 줄기에서 질소시용농도의 증가에 따라 증가하는 경향이었다. 잎과 줄기의 in vivo(-NO₃?) NRA 분포는 질소의 시용농도 증가에 따라 증가하였으나 뿌리에서는 감소하였다. 배나무의 생장과 질산환원을 충분히 촉진할 수 있는 적정 질소농도는 200㎎ㆍL¹이었다. This study was conducted to anticipate nitrate reduction state in tree through measurement of nitrate reductase activity (NRA) and investigate the effect of nitrogen concentrations (100, 200, 400, and 600 ㎎ㆍL¹) on growth, the nitrogen content of various tissue, and NRA of pear (Pyrus pyrifolia cv. Niitaka) seedlings in sand culture. Nutrient solutions used in this experiment were adjusted to pH 6.5 and fixed the ratio of ammonium and nitrate to 1:3 and trickle-irrigated 3 times a day. Tree height and dry weight of various organs in seedlings were higher in low nitrogen concentration (100 and 200 ㎎ㆍL¹) than in high nitrogen concentration (400 and 600 ㎎ㆍL¹). The shoot growth in 600 ㎎ : L -I was extremely poor by nitrogen over supply. Increasing the nitrogen concentration, the concentration of nitrate-N in leaves and roots were insignificantly changed but that of stems increased. The accumulation of total and reduced nitrogen in all organs with increasing concentrations of nitrogen supply were increased at 30 days after treatment but those of all organs at 60 and 90 days after treatment were highest in 600 ㎎ㆍL¹, whereas there were no significant changes among other nitrogen concentration. The in vivo (+NO₃?) NRA of all organs did not relate to nitrogen concentration but the in vivo (-NO₃?) NRA of leaves except roots increased with increasing the nitrogen concentration. Therefore, the proper nitrogen concentration to promote growth and nitrate reduction of pear tree was 200 ㎎ㆍL¹.