遮光處理對防範紅龍果肉質莖日燒傷害之研究

Research on Preventing Sunburn Damages on the Cladodes of Pitaya by Shading Treatments

陳奕君(Yi-Chun Chen) ； 林延諭(Yen-Yu Lin)

《臺東區農業改良場研究彙報》 26輯 (2016/08) Pp. 41-57

摘要

本研究主要探討不同遮光處理對紅龍果(品種為‘大紅’)肉質莖之溫度、日照強度、日燒等級及果實品質之影響。試驗期間為2015 年6 月至10 月，分別於植株上方架設寬度60 公分，遮光率約65%黑色遮光網及遮光率約35%白色遮光網，進行非全天候局部遮光處理，以不遮光者為對照。結果顯示，試驗期間黑色遮光網處理之紅龍果肉質莖表面平均溫度、日照強度及總日燒率均低於白色遮光網處理者及對照組；在果實品質方面，無日燒症狀之肉質莖上的果實之果重及果肉全可溶性固形物含量均高於發生日燒1 級及2 級者，可滴定酸及果肉率則無顯著差異；不同遮光處理中無日燒枝條上果實之果重、果肉全可溶性固形物、可滴定酸及果肉率等均無顯著差異。以上結果顯示，紅龍果肉質莖發生日燒會造成果實之果重及全可溶性固形物含量降低，且日燒等級越高影響越大；以65%黑色遮光網進行遮光處理，則可有效減低肉質莖日燒傷害。

關鍵字

紅龍果 ； 肉質莖 ； 溫度 ； 日照強度 ； 日燒 ； 遮光網 ； 果實品質

並列摘要

With the aim of preventing the sunburn damages on the cladodes of red-fleshed 'Da Hong' pitaya, the effect of two shade net (65% black shade net and 35% white shade net) on the cladodes temperature, sunburn level and fruit quality was studied. This experiment was conducted with 60 cm wide shade nets to create the 'partial day shading', and no shading as a control. The results indicated 65% black shade net could significantly reduce surface temperature and total sunburn percentage of cladodes. In answering how these sunburn damages on cladode affected fruit qualities, we compared the fruit's qualities between different cladodes damage level. The result suggested that the higher sunburn damage level will significantly reduce the fruit weight and total soluble solids content, and with no effects on total titratable acidity and pulp percentage. There were no significant different of the fruit qualities on normal cladodes (without sunburn symptom) between different shading treatments. The findings of this study showed the partial day shading environment creating by 60 cm wide shade net could reduce sunburn damages on cladodes and bring a better fruit quality.

並列關鍵字

Pitaya ； Cladodes ； Temperature ； Solar radiation ； Sunburn ； Shade net ； Fruit quality