杨树扦插育苗中,对插穗进行催根处理,可以使杨苗扎根早、出苗快、长得齐。催根方法如下: 插条前10天左右,把剪好的插穗每30—50根捆成小捆,在冷水里泡上一天,然后,在背风向阳地上挖长方形土坑,坑深40厘米,坑底垫10厘米厚的沙子(沙坑坑深30厘米,不用另垫沙),坑宽100—150厘米,坑长依据插穗多少而定。把泡过的插穗捆倒立在坑内,一捆捆摆好,每捆之间要填满沙子,不留空隙。再覆盖5—10厘米厚沙土,浇一次水,苫上塑料薄膜或草帘,以提高坑内湿度和保持坑内的湿润。经过7—10天左右,当插穗芽苞突起还未突破表皮时,就要立即取出扦插。不能等长出小白根再扦插,那样会影响成活的。扦插时要随插随取,切忌风干,不要 Poplar cutting seedlings, the cuttings for the root treatment, Yang Miao can rooted early, rapid emergence, grows Qi. Roots are as follows: Cuttings about 10 days before the cuttings cuttings every 30-50 bundles into small bundles, soak in cold water for a day, and then leeward in the sunny digging rectangular pit, pit depth of 40 cm, Pit bottom cushion 10 cm thick sand (sand pit deep pit 30 cm, without another pad), pit width 100-150 cm, pit length depending on how many cuttings. Put the blighted cutting cuttings in the pit, and put them in a bundle, and fill the sand with each bundle, leaving no gaps. And then covered with 5-10 cm thick sand, pour water, 苫 plastic film or straw curtain to improve the pit humidity and keep the pit moist. After about 7-10 days, when the cut bud bud protrusion has not yet broken the epidermis, it is necessary to immediately remove the cuttings. Can not wait to grow small white root and then cuttings, it will affect the survival. Cuttings should be inserted with the take, should not be dried, do not