盆栽聖誕紅植體生長與養分吸收之研究

Studies on Plant Growth and Nutrient Uptake on Potted Poinsettia

羅秋雄(Chiu-Shyoung Lo)

《桃園區農業改良場研究彙報》 50期 (2002/09) Pp. 17-23

https://doi.org/10.29567/ZHWHGX.200209.0003

摘要

本研究主要目的，在探討聖誕紅（Euphorbia pulcherrima）生育期間植體生長及養分吸收之變化情形，以提供栽培聖誕紅液肥調配及肥培管理之依據。試驗自2001年7月至2002年2月於桃園縣新屋鄉進行。結果顯示，聖誕紅插穗於八月中旬插植，至開花盛期所需生長日數為127天，植體總生長量27.1 g/pot，影響聖誕紅植體生長量的關鍵因素為累計日照時數。植體的相對生長速率，以苞葉開始著色後至開花盛期最高，全株為1.54 g/pot/day。聖誕紅植體氮、磷及鉀養分含量比值為11.2：1.0：17.5，其吸收量以鉀最高1,100 mg/pot，其次為氮705 mg/pot，再次為磷63 mg/pot，鈣及鎂之吸收量分別為155 mg/pot及76 mg/pot。聖誕紅生育期間葉片氮、磷、鉀、鈣及鎂濃度分別在2.4－3.3%、0.15－0.3%、1.7－3.3%、0.65－0.87%及0.20－0.32%之間。

關鍵字

聖誕紅 ； 植體生長 ； 營養吸收

並列摘要

A plastic greenhouse study was conducted at Taoyuan Hsinwu during the period from July 2001 to February 2002 to determine the changes of plant growth and nutrient uptake of potted poinsettia (Euphorbia pulcherrima). The accumulated duration of sunshine was key-limiting factor contributing to vegetative growth and nutrient uptake of potted poinsettia. The growing days of potted poinsettia was significantly affected by temperature and duration of sunshine; the growing days for August transplanting was 127 days and vegetative mass was 27.1 g/pot. Relative growth rate (RGR) of plant was higher occurring bract formation through anthesis, average 1.54 g/pot/day. The N, P, K concentration ratios of plant tissue were 11.2:1.0:17.5 for August transplanting. Measurement of the plant nutrient concentration showed that highest nutrient concentration of potted poinsettia was potassium next were nitrogen and phosphorus concentration, respectively. The concentrations for N, P, K, Ca and Mg in the leaf were between 2.4-3.3%, 0.15-0.3%, 1.7-3.3%, 0.65-0.87%, 0.20-0.32%, respectively, at growing periods of potted poinsettia.

並列關鍵字

Potted poinsettia ； plant growing ； nutrient uptake