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对岩棉基质栽培15个月的非洲菊Ａｍｂｅｒ和Ｊｏｙｃｅ(两者分别对黄化较敏感或不敏感),在营养液中添加不同量的ＮＨ4使其ｐＨ值为67～56,Ｍｎ含量分别为075或15μｍｏｌ/Ｌ。当ｐＨ值降低时,植株黄化受到强烈抑制;ｐＨ值最高时,增加Ｍｎ含量才减少黄化。ｐＨ值对切花数量和重
Amber and Joyce germplasm cultivated for 15 months on rockwool matrix were sensitive or not sensitive to yellowing respectively. Different amounts of NH4 were added to the nutrient solution to make the pH value of 67-56. The content of Mn were 075 or 15 μmol / L. When the pH value decreased, plant yellowing was strongly inhibited; the highest pH, increase the Mn content to reduce yellowing. The pH value of cut flowers and weight