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저농도 질소시비가 배나무 실생묘의 생육과 수체내 질소함량에 미치는 영향
김송남,오성도,최동근 전북대학교 농업과학기술연구소 2002 農大論文集 Vol.33 No.1
Seedlings of 'Niitaka' cultivar in Japanese pear were supplied with nutrient solution at pH 6.5 with four level of nitrogen concentration (33, 50 100, and 200 mg․L^-1) in a sand culture. Fresh weight and plant height were increased with increasing concentration of nitrogen supply. Total nitrogen and reduced nitrogen in most of organs were also increased with increasing concentration of nitrogen supply. Increasing nitrogen supply decreased the content of nitrate nitrogen in leaves and stems, but that of increase in roots. The in vivo-NO_3^- nitrate reductase activity(NRA) of leaves and stems were not detected when the seedlings grown in low concentration of nitrogen than 200mg․L^-1, but increasing nitrogen supply increased in vivo - NO_3^- NRA of roots. The in vivo + NO_3^- NRA in all organs were increased with increasing nitrogen supply. In NRA of each organs, it in the leaves was the highest and in the root was higher than in the shoot. It could be therefore recommended that nitrogen should be supplied with around 200mg․L^-1 in Japanese pear trees.