根外追肥对南方红豆杉二年生实生苗生长的影响

对南方红豆杉二年生实生苗采用磷酸氢钾铵、光合微肥、复合肥三种肥料进行根外追肥试验。试验结果表明，根外追施对南方红豆杉苗的苗高、地径及侧枝生长都有明显的促进生长作用，其追肥后平均高达２６～３０ｃｍ，地径４．２～５．２ｍ，侧枝数８～１１条，侧枝长度１４～１８ｃｍ，显著高于对照。根外追肥可以解除红豆杉苗６～７月间的生长暂停状态；说明根外追肥是促进红豆杉速生丰产的有效途径之一。结果还表明，不同肥料在苗木生长的不同时期，其增产效果存在明显差异，这与苗木生长在不同时期对营养元素的吸收量和需要量有关。

The Effects Foliage Dressing to the Growth of Taxus Chinensis Var. Mairei Seedlings

Two years seedlings of Taxus chinensis (Pilg.) Rehd.var mairei (Lemee et Levl .) Cheng et L.K. Fu were tested dressing outside the roots using NH_4KHOP_4, photosynthesis fertilizer and compound fertilizer .The experiments showed that foliage dressing can promots the growth of the seedlingsincluding the height, underground radius, the number and the length of lateral branches. After foliagedressing the seedling height is 26-30 cm, the underground radius is 4.2-5.2 mm , the alteral branches are8-11 and the length of lateral branches is 14-18 cm. The seedlings are better than the contrasted ones.The fertilizer can relieve the suspension of the growth in June and July. Forllage dressing is one of thebetter ways to quicken the growth. The results also showed that there are apparent differences in thegrowth when applying differen fertilizers in different growth time. This is related to the absorbing andrequiring amount of nutrious elements in different times.