抄録
植物成分を原料にした生分解性鉢を用いて, 異なる灌水頻度でトマトを育苗し, ポリエチレン鉢(ポリ鉢)を対照として, 定植までの苗の生育と養分含有率について調査した.ポリ鉢と比較して, 生分解性鉢での苗の生育は, 草丈, 根長, 葉数, 葉面積および乾物重のいずれの項目でも低い値を示した.各養分含有率は, パーム鉢でのリンを除いて, いずれの鉢でも類似した値を示した.このことから生育量の差異は, 養分吸収能の差に起因するものではないと考えられた.コーン鉢では, 灌水量を増加することで苗の生育が改善されたが, ポリ鉢の生育よりは劣っていた.このことから, 生分解性鉢での育苗では, 灌水量以外にも生育を阻害する要因が存在することが示唆された.
Tomato seedling growth and nutrient concentrations in biodegradable paper pots composed of corn or palm were investigated under different irrigation frequencies before the seedlings were transplanted. In comparison with the seedlings in plastic pots (control), seedlings in biodegradable pots developed shorter shoot and root lengths, fewer leaves, smaller leaf area, and showed a lighter dry weight. The concentrations of nitrogen, phosphate, and potassium in the seedlings in the biodegradable pots were similar to those in the control. The only exception was phosphate in the biodegradable pots made from palm. These findings indicate that differences in plant growth between the control and the biodegradable pots were not caused by differences in nutrient absorption ability. Plant growth in the biodegradable pots made from corn was improved by increasing the irrigation frequency; however, the growth rate was still less than that of the control. This suggests that other factors, in addition to irrigation frequency, are related to the lower growth rate of seedlings in biodegradable pots.
