營養管理對葉菜甘藷產量及抗氧化力之影響

Effects of Fertilization on the Yield and Antioxidant Capacity of Leafy Sweet Potato

胡正榮(Cheng-Jung Hu) ； 全中和(Jong-Ho Chyuan)

《花蓮區農業改良場研究彙報》 29期 (2011/12) Pp. 1-12

https://doi.org/10.6957/RBHDAIS.201112.0001

摘要

本研究以施用全量化學肥料、全量與半量有機質肥料及僅施用有機質基肥的施肥處理，探討營養管理對兩個葉菜甘藷品種產量之影響，並測定其80%甲醇萃取液之FRAP抗氧化力及清除DPPH自由基能力，同時測定多酚含量變化。結果顯示‘桃園2號’及‘臺農71號’二品種採用有機質肥料栽培並不減少其產量，且使用半量有機質肥料即可表現和慣行化學肥料栽培相當之產量，而其抗氧化力亦不低於慣行化學肥料栽培。二品種在兩個試驗年度的之FRAP抗氧化力、清除DPPH自由基能力及多酚含量與施肥處理間的變化趨勢不太一致，可能是受環境氣候等因素的影響。綜合評估兼具產量與抗氧化力的結果，在防雨設施內栽培葉菜甘藷的營養管理以施用半量有機質肥料，可供有機蔬菜生產者參考。葉菜甘藷的抗氧化力屬於採後下降型，建議採收後應儘早食用，以保持較高的抗氧化力。

關鍵字

葉菜甘藷 ； 施肥 ； 產量 ； 抗氧化力 ； 多酚

並列摘要

The leafy sweet potato varieties 'Taoyuan No. 2' and 'Tainung No. 71' were used to study the effects of four fertilizing treatments, including cultivation with full-quantity chemical fertilizer, full-quantity organic fertilizer, half-quantity organic fertilizer, and only using pre-planting organic fertilizer, on the yield and antioxidant capacity. The results showed that application half-quantity organic fertilizer on 'Taoyuan No. 2' and 'Tainung No. 71' leafy sweet potato got equal yield compared to those with full-quantity chemical fertilizer, and it's more cost-effective to fertilize for organic farming. The ferric reducing antioxidant power (FRAP), scavenging DPPH free radical ability, and total phenolics of two leafy sweet potato varieties fertilized with only using pre-planting organic fertilizer or half-quantity organic fertilizer were equal, even higher than those with full-quantity chemical fertilizer. But the change pattern between antioxidant capacity, total phenolics and fertilizer levels of two experimental years was not the same. It might be due to the effects of different environmental climate factor. We suggested that it's more effective for organic farming to cultivate leafy sweet potato in the PE-house with half-quantity organic fertilizer to get good yield and antioxidant capacity. The pattern of change in antioxidant capacity of leafy sweet potato was the descending type showed the antioxidant capacity declined during leaf senescence.

並列關鍵字

leafy sweet potato ； fertilization ； yield ； antioxidant capacity ； total phenolics