米兰花用什么方法繁殖成活率高?
米兰用扦插和高压法繁殖成活率都较高。尤其在全光照喷雾条件下扦插,成活率更高。米兰扦插生根比较慢,长江流域宜在梅雨季节进行,取树冠外围当年生充实的枝条长8~10厘米,保留先端的2~3片小叶,嫩枝上最好带一段老枝,然后扦入园土和砻糠灰各半的基质中,也可用疏松泥土或蛭石等,扦插后遮阴,并盖薄膜保湿,在25~30℃,空气相对湿度在90%以上的条件下,约45天才能生根。若温度、湿度达不到,2个月左右才能生根。
若用500 ppm萘乙酸快浸插穗,同样条件下则20天就可生根。米兰高压法也以一年生枝最易生根,三年以上的枝条很难生根,高压在5~9月都可以,仍以6月梅雨季节最适宜,一般40天就能生根。进行高压时,选一年生壮枝,在高压部位实行环状剥皮,剥皮的宽度为1~1.5厘米,要将皮层刮剥干净,见到木质部,皮层剥得干净与否是生根成活的关键,然后将塑料膜包在环剥位置,并将其下部扎好,填人湿润的泥炭或腐殖土,再封好上口,用绳线等物将高压部位的土坨固定在其他枝条上,以后注意补水保持基质湿润,1个月后这部分叶片泛黄色时,表明伤口已开始愈合,再过10天左右就能生根。
生根后剪离母体,栽植时不要弄散土坨,刚上盆的小苗要放阴处缓苗1周,待到部分老叶脱去后,再逐步移到日光充足处,进行正常水肥养护.有的当年就可开花。
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