In order to ifnd the optimum K fertilizer application levels for youngC. oleiferaforest, and to provide some theoretical basis for scientiifc fertilization, using ifve-year trees of‘Ganwu’ series, effects of different fertilizer treatments on tree growth, nutrient accumulation in leaves and nutrient contents in soil were investigated. The treatments included five K element levels (K0, K1, K2, K3, K4), a control treatment of applying compound (CKFHF) and another control treatment of no fertilization (CK0). The results showed that fertilization could signiifcantly improve increments of the growth indexes ofC. oleiferatrees and nutrient contents in leaves and soil. As the level of K fertilizer application rate was increased, increments of the growth indexes ofC. oleiferatrees and nutrient contents in leaves were increased and the highest values were reached in K3 treatment, and the efifcacy of CKFHF treatment was less than that in K2 treatment. With improvement of K application level, available K and organic matter contents in soil were signiifcantly increased, and alkali solution N and available P contents in soil were ifrstly decreased and then increased, and reached the lowest value in K4 treatment. The response curves of K content in leaf and soil to K application amount were obtained, and the optimum application level of K fertilizer (317.72~322.25 g per plant) was determined.%为了确定油茶幼林钾肥最适施用量，从而为油茶的科学施肥提供理论依据，以‘赣无’系列的5年生油茶林分为试验对象，设置了5个钾素水平处理（K0、K1、K2、K3、K4），1个施用复合肥的对照处理（CKFHF）和1个不施肥的处理对照（CK0），就不同施肥处理对油茶树体生长、叶片养分积累和土壤养分含量的影响情况进行了试验、测定与分析。结果表明：施肥均能显著提高油茶树体各生长指标的增幅和叶片及土壤中各种养分的含量；随着施钾水平的提高，油茶树体各生长指标的增幅和叶片中各种养分的含量均随之增加，K3处理的达到最大值，复合肥处理的肥效小于K2处理；随着施钾水平的提高，油茶林地土壤中速效钾和有机质的含量均显著性增加，而土壤中碱解氮和有效磷的含量则随着施钾水平的提高均先减小后增加，K4处理的降到最小值；对油茶叶片中的钾含量、土壤中的速效钾含量与施钾量进行拟合，得出其响应曲线，并确定了对油茶幼树施用钾肥的最适用量范围为317.72～322.25 g/株。
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