Controlled-release Fertilizer in the Production and Quality of Acacia mangium Seedlings

ABSTRACT In order to evaluate the use of controlled-release fertilizer in the production and quality of Acacia mangium seedlings, this experiment was conducted in randomized blocks, and treatments consisted of five levels (0, 2.5, 5.0, 7.5 and 10.0 kg m–3 of substrate) of Osmocote Plus® in six replicates. After 130 days of sowing, the production and quality variables of Acacia seedlings were analyzed. All production and quality variables, height/shoot ratio (HSH) and Dickson quality index (DQI) were influenced by the fertilizer doses. The greatest mean values of stem diameter, total height, shoot dry mass, root dry mass, the best HSH and the highest DQI, were obtained for doses ranging from 7.1 to 7.8 kg m–3 of substrate. The largest leaf area was obtained using a dose of 9.3 kg m–3 of substrate.摘要：为评价控释肥料（controlled-release fertilizer）在马占相思（Acacia mangium）苗木生产与品质培育中的应用效果，本试验采用随机区组设计，设置5个奥绿肥Plus®（Osmocote Plus®）基质施用量水平（0、2.5、5.0、7.5、10.0 kg·m⁻³），每个处理重复6次。播种130天后，对马占相思苗木的生长及品质指标进行测定分析。所有生长及品质指标、株高地上部比（Height/Shoot Ratio, HSH）及迪克森质量指数（Dickson Quality Index, DQI）均受肥料施用量的影响。当基质施用量为7.1~7.8 kg·m⁻³时，苗木地径、总株高、地上部干质量、地下部干质量均达到最高均值，且株高地上部比与迪克森质量指数最优；当基质施用量为9.3 kg·m⁻³时，苗木叶面积达到最大值。