泡桐生长快、材质好,用途广.为了在单位面积上多生产泡桐大苗、壮苗,1980年我们在泡桐育苗过程中应用根外追肥的办法,对促进苗木生长,提高出圃率,取得了显著效果.如大丰县大兴公社阜北八队,根外施肥的苗木平均高2.95米,最大3.2米,平均胸径3.8厘米,最大4.1厘米.根际加根外迫肥的苗木平均高3.55米,平均胸径4.5厘米,最大4.7厘米.具体方法介绍如下:在7月上旬到8月下旬,于泡桐苗木快速生长、对养分的需要较迫切的阶段,采用1%草木灰浸提液、0.5%尿素和1% Paulownia grow fast, good material, wide use .In order to produce more Paulownia seedlings per unit area, strong seedlings, in 1980 we Paulownia seedlings in the process of applying top-dressing, to promote the growth of seedlings, improve the yield rate, and achieved remarkable Such as Dafeng County Dafeng commune Fubei eight teams outside the root fertilization seedlings average high 2.95 meters, the largest 3.2 meters, the average diameter of 3.8 cm, the largest 4.1 cm root rhizosphere outside fertilization seedlings average 3.55 meters high, with an average Diameter of 4.5 cm, maximum 4.7 cm. The specific methods are described as follows: In early July to late August, rapid growth of Paulownia seedlings, nutrient needs more urgent stage, using 1% ash extract, 0.5% urea and 1 %