Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/28853
標題: 葉萵苣硝態氮累積與氮肥使用率之研究
Nitrate Accumulation in Lettuce(Lactuca sativa L.) and its Nitrogen Use Efficiency.
作者: 王三太
Wang, San-Tai
關鍵字: Lettuce
葉萵苣
Nitrate accumulation
Nitrogen use efficiency
硝態氮累積
氮肥使用率
出版社: 園藝學系
摘要: 調查台灣目前慣行栽培的葉萵苣品種28種,硝態氮含量有品種間差異 ,高與低的品種相差約一倍;在尖葉型與圓葉型的萵苣皆有硝態氮含量的 差異,圓葉型萵苣硝態氮含量高低之間的差異較尖葉型的大。葉萵苣硝態 氮含量隨施肥量增加而增加,但低硝酸鹽累積者如R14、R24、S25、R37隨 氮肥濃度提高,葉部硝態氮含量的幅度不大,而R8、R13、R43則氮肥濃度 提高而葉片硝態氮含量提高的幅度較大。硝態氮含量與硝酸還原酵素活性 間的相關性低。3mM 硝酸銨處理組的硝態氮含量,在一天中不同時間取樣 ,葉片的硝態氮含量皆低於 6mM硝態氮處理組,且高低之差距較 6mM硝態 氮養液處理小。6mM 氮肥中混合20%或50%銨態氮處理皆可有效降低葉萵苣 硝態氮含量,即使在50%遮光網遮光下,20%與 50%銨態氮處理也能有效降 低植體中硝態氮含量24.6%、33.9%;而且50% 銨態氮處理可提高葉萵苣乾 物量 17%。氮肥使用率有品種間差異,以R37養液中氮含量最高,由2mM提 高至15mM,氮肥使用率隨施肥增加而降低。氮肥使用率高、硝態氮含量低 的品種有R37、R14。
Genotypial difference in nitrate content was found in 28 lettuce cultivars, with the maximum difference cultivar reached 100%. Variation of round tip was found higher than sharp tip type in leafnitrate content. The nitrate concentration of cultivars R8, R13, R43 increased with nitrogen application and rate of enhancement is greater than R14, R24, S25, R37 which identified as low nitrate cultivars. Leaf nitrate contents of 6 cultivars were not found positively correlated with nitrate reductase acticity. Leaf nitrate content and variation in 3mM NH4NO3 solution was lower than 6mM NO3-N treated plants at different time of a day. Six mM nitrogen treatment together with 20% or 50% ammonium-N effectively reduced leaf nitrate content; to the leavels of 24.6%, 33.9% under 50% shading condition with the addition of 20% and 50% of ammonium-N in the culture solution. Fifty percent ammonium-N also increased the dry weight of lettuce by 17%. There were variety difference in nitrogen use efficiency(NUE) with R37 the highest. The NUE decreased with increasing fertilizer application while nitrogen concentration in the culture solution was raised from 2mM to 15mM. R37, R14 were found to be the high NUE and lower nitrate content cultivars.
URI: http://hdl.handle.net/11455/28853
Appears in Collections:園藝學系

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