土壤溫度對香石竹、鐵砲百合、及天竺葵生長之影響

THE EFFECT OE SOIL TEMPERATURE UPON THE GROWTH OF CARNATION (DIANTHUS CARYOPHYLLUS, L.) EASTER LILY (LILlUM LONGIFLORUM, THUNB) AND GERANIUM (PELARGONIUM HORTORUM BAILEY)

本文研究土壤溫度對香石竹（Dianthus caryophyllus, L.）鐵砲百合（Lilium Iongiflorum, Thunb）及天竺葵（Pelargonium hortortim, Bailey）生長之影響，植株種于溫室盆栽土壤中，放入不同水槽，維持土溫為華氏80度，60度及40度。氣溫保持夜溫為華氏68度。各植株測定其乾物質重，至開花所需日數及全株葉數，香石竹則更測定側枝數及全生長量，花朵大小。鐵砲百合更測定萌芽所需日數，花朵數，天竺葵則測定葉面積，花束數每花束小花數。結果顯示，香石竹各處理間在側枝數及全生長量，全重量及地上部重量方面有顯著差別，40度處理植株劣於60度及80度者，而60度及80度間則無顯著差異。鐵砲百合方而，40度土壤處理植株萌芽遲緩，至試驗完了仍未開花，60度及80度土溫處理植株在萌芽所需時間並無差異，但80度者開花早6.6日。天竺葵方面，40度土溫處理植株劣於80度及60度者而80度與60度間則無顯著差異。

Among many environmental factors influencing p.la,nt growth, soil temperature is an important one. In natural conditions, the seasonal changes in soil temperature determine to a certain extent the germination of seeds, emergence and growth of plants. Some cuJttiraI practices such as time of seeding, mulching, shading, use of compost in hot bed are all related. to soil temperature.