Rate of Root Respiration of Lettuce under Various Dissolved Oxygen Concentrations in Hydroponics.
スポンサーリンク
概要
- 論文の詳細を見る
Knowledge on relationship between the rate of root respiration and dissolved oxygen (DO) concentration is essential for understanding the oxygen balance around roots in hydroponics. An airtight hydroponic system for the measurement of root respiration of lettuce was constructed. The initial concentrations of DO were 26 μmol⋅liter<SUP>-1</SUP> ("treatment one-tenth"), 130 μmol⋅liter<SUP>-1</SUP> ("treatment one-half"), 260 μmol⋅liter<SUP>-1</SUP> ("treatment saturation"), and 380 μmol⋅liter<SUP>-1</SUP> ("treatment over-saturation") . From the patterns of decreasing DO concentration during a 48 hr measurement period, the minimum DO concentration for root respiration and the rate of root respiration were calculated. The minimum DO concentration for the root respiration of lettuce 26 days after transplanting was around 78.2 μmol⋅liter<SUP>-1</SUP>. The changes of DO concentration in treatments with plants four and ten days after transplanting were small.<BR>The rate of root respiration was presented as a function of DO concentration, and increased as the DO concentration of nutrient solution increased. For DO concentrations in the range from 190 to 230 μmol⋅liter<SUP>-1</SUP> which is usually observed in well aerated hydroponic beds, the rate of root respiration of lettuce 26 days after transplanting ranged from 2.9 to 6.7 μmol⋅hr<SUP>-1</SUP>⋅ (ml roots) <SUP>-1</SUP> at 23°C. In "treatment saturation, " and larger root growth and greater amount of transpiration were attained in this treatment than in other treatments.
- 日本生物環境工学会の論文
日本生物環境工学会 | 論文
- 温室における燃焼式蓄熱型二酸化炭素施肥システムの省エネルギー性・環境負荷低減性・経済性評価
- 高濃度培養液を用いる高糖度トマト生産に適した循環キャピラリー栽培システムの開発
- 2種のUV励起光によるラッカセイ生葉のLIFスペクトル変化および蛍光葉内分布
- ナメコ子実体の光形態形成過程における発現遺伝子の解析
- 光の波長と環境温度がナメコの生体電位および形態形成に及ぼす影響