花卉叶面施肥应注意哪些问题
①叶面施肥是将肥料溶解于水中喷洒在叶面上,通过叶面的气孔或角质层,渗入叶内,供植物利用。
②不是任何肥料都能作叶面施肥用,只有溶解度较大的肥料如尿素、硝酸铵、硫酸钾、磷酸二氢钾、过磷酸钙和腐熟后的人粪尿液才能供叶面施肥用。
③施化肥溶液,一般加水200~500倍稀释。
④应在气温较低、湿度较大时使用,最好是在早晨喷施。肥液在叶面应保留1小时以上。一般嫩叶比老叶吸收快,叶底比叶面吸收快。喷时上下左右都要周到。
⑤所用肥料应在用前泡好,让其充分溶解,滤去不溶物质。也可与杀菌剂、杀虫剂一起混合使用,收到双重效果。
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