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杜仲树适宜栽种在阳坡排水良好的地方,土壤以肥沃疏松、土层深厚的沙壤土为宜。在生产中,常因立地条件不好,或者从苗圃移栽入大田后管理跟不上,致使杜仲树苗生长缓慢、组织老化,生长几年后树千直径加粗极为有限,以致形成“小老树”。这种现象比较普遍。 杜仲“小老树”怎么防治?据本人多年观察和试验,春季进行全截更新,是促进杜仲树苗速生快长的有效措施。杜仲树苗全截2年6个月后,平均株高3.38米,不截苗平均1.1米,全截苗比不截苗生长快2倍以上;全截后5年测定,平均株高为4.42米,胸径2.6厘米,不截苗平均株高为1.81米,胸径1.2厘米。据笔者观察,杜仲苗春季全截更新后,一般生长速度5年内可
Eucommia trees suitable for planting in the sunny drainage of good places, fertile soil loose, deep soil sandy loam is appropriate. In production, often due to poor site conditions, or from the nursery transplanting into the field management can not keep up, resulting in Eucommia saplings grow slowly, tissue aging, growth a few years after the tree thousands of diameter bold is extremely limited, resulting in the formation of “old tree”. This phenomenon is more common. Eucommia “little old tree” how to prevent? According to my observation and experiment for many years, the full update in spring, is to promote Eucommia saplings fast growing effective measures. Eucommia saplings full cut 2 years and 6 months after the average height of 3.38 m, not the average seedling of 1.1 m, full-cut seedlings grew more than 2 times faster than the non-seedling growth; measured 5 years after the full cut, the average height of 4.42 m , DBH 2.6 cm, average seedling height of 1.81 m, DBH 1.2 cm. According to my observation, Eucommia spring full section update, the general growth rate within 5 years can be