硝酸鈣施用對聖誕紅生育之影響

Abstract

本試驗是以聖誕紅'Supjibi'、'Peter Star'以及'Angelika'三品種為材 料，探討不同濃度硝酸鈣之施用對聖誕紅生育、礦物營養、組織形態及枝 條強度之影響。不同濃度硝酸鈣處理對'Supjibi'及'Peter Star'二品種 之株高、展幅、葉片數、總葉面積等營養生長性狀並無多大之影響，而 對'Angelika'之株高、展幅、總葉面積及葉片鮮乾物重則有顯著之影響， 且隨硝酸鈣處理濃度之增加而增加；三品種之花序直徑、苞片數、苞片面 積、苞片顏色 ( 明度、色相及彩度 )則不受處理之影響。不同濃度硝酸 鈣處理後，三品種苞片之磷、鉀含量均比葉片高，而氮、鈣及鎂葉片含量 比苞片高，但銅及鋅之含量則屬缺乏之程度。不同濃度硝酸鈣處理對有無 行摘心處理之聖誕紅植株葉片之鈣及鎂之含量比枝條高，鉀之含量兩者差 不多。而葉片中游離鈣與結合鈣之含量均比苞片以及枝條來得多。不同濃 度硝酸鈣處理對聖誕紅之蒸散作用與氣孔導度之影響，就 'Supjibi' 而 言，不論第四、第五或是第六節位之葉片其蒸散作用與氣孔導度皆以800 ppm 高濃度之硝酸鈣處理最高。枝條強度、斷裂強度、拉力、粘著力及脆 度三品種皆有隨硝酸鈣處理濃度之增加而增加之趨勢。就植物之組織形態 而言，對照組與高濃度之硝酸鈣處理組之間並無顯著之差異存在。

Experiments were conducted to investigate the effects of dif- ferent concertrations of calcium nitrate treatments on the growth and development,nutrition, stem strength and plant morphology of poinsettia(Euphorbia plucherrima Willd. ex Klotzsch) cvs. Supjibi, Peter Star and Angelika. Results indicated that different concentrations of calcium nitrate treatments on the height, width, leaf number, total leaf area and vegetable growth were not significant, however they appeared to be coincide with increased concentration of Ca( NO3)2 applied to 'Angelika' poinsettias. No significant difference of treatments on the total inflorescence diameter, bract number, total bract area and bract color( including lightness, value of a and b, hue and saturation) of the three cultivars. Leaf P and Ca contents are lower than that of bract after treatment of different concentration of calcium nitrate, but leaf N, Ca and Mg contents are higher than that of bracts. Both of Cu and Zn contents were in deficiency range. Leaf Ca and Mg contents were higer than those the of stems,but both leaf and stem K contents were similar. Free and bound calcium in leaves was higer than that in bracts and stems. The transpiration and stomatal conductance of 4th, 5th and 6th leaves of cv. Supjibi treated with 800 ppm Ca(NO3)2 showed the highest one. Stem strength, break intension, trail, jelly and crisp were fairly corelated to Ca(NO3)2 treatment levels in the three cultivars. There was no significant difference in plant morphology of poinsettia in different Ca(NO3)2 treatments.