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植株缺肥,叶子发黄,叶子边朝下挂。如施药浓度过大,叶片也会发黄,但叶子边缘是朝上卷。植株从上到下逐渐发黄是缺铁;从下朝上发黄是缺肥(下部叶片老化除外)。缺铁,可将废铁钉、铁片用水浸泡,待水的颜色变得深褚色(锈水),倒入盆花中,会很快扭转叶黄现象。缺肥时,最好施以液肥,浓度不宜过大,腐熟的鸡粪、豆饼不要直接施入盆花中,应加入十倍清水稀释后使用。
Plants lack of fertilizer, leaves yellow, hanging down the side of the leaves. If the drug concentration is too large, the leaves will be yellow, but the leaf edge is up. The plants gradually yellow from top to bottom is iron deficiency; yellow from the bottom up is the lack of fertilizer (the lower part of the leaves except aging). Iron deficiency can be iron nails, iron soaked in water until the color of the water becomes dark brown color (rust water), into the potted flowers, the leaf will quickly reverse the phenomenon. When missing, it is best to apply liquid fertilizer, the concentration should not be too large, maturity of chicken manure, bean cake do not directly applied to potted plants, should be added to ten times diluted with water.