Reuse of Residues as Substrate for Production of Eucalyptus (Eucalyptus urograndis) Seedlings

Abstract Studies about crop residue management have become essential due to the possibility of their use in forest seedlings production. This study evaluated the effect of coffee moinha (MO) on substrates composed of vermiculite (VE), coconut fiber (CF) and carbonized rice husk (CRH) in the development of Eucalyptus seedlings. The experiment was conducted in a completely randomized design, with five treatments of increasing proportions of MO/decreasing proportions of CRH (0/28, 7/21, 14/14, 21/7 and 28/0%) and fixed proportions of VE (36%) and CF (36%) in the substrate. At 85 days after planting, the following parameters were assessed: shoot height, stem diameter, root dry mass, shoot dry mass, emergence percentage and Dickson’s quality index (DQI). The results showed CRH could be fully substituted by MO (28%) in the substrate composition because the assessed variables presented lower values than the control treatment (0% MO + 28% CRH + 36% VE + 36% CF). Moreover, the maximum vegetative development in Eucalyptus seedlings was achieved when CRH was replaced by up to 20% MO. In this way, MO becomes an alternative as a substrate component for Eucalyptus seedlings production.

摘要 鉴于作物残渣在林木育苗生产中的应用潜力，作物残渣管理相关研究已愈发重要。本研究评估了咖啡磨渣（coffee moinha）对以蛭石（vermiculite, VE）、椰纤维（coconut fiber, CF）及碳化稻壳（carbonized rice husk, CRH）为基础组分的育苗基质在桉树（Eucalyptus）幼苗生长中的应用效果。试验采用完全随机设计，设置5组MO比例递增、CRH比例递减的处理（0/28、7/21、14/14、21/7及28/0%），基质中蛭石与椰纤维的占比固定为36%。于移栽后85天，测定以下生长指标：苗高、茎粗、根干重、地上部干重、出苗率及迪克森质量指数（Dickson’s Quality Index, DQI）。结果显示，在基质配方中以MO完全替代CRH（28%MO处理组）时，各测定指标值均低于对照组（0% MO + 28% CRH + 36% VE + 36% CF）。此外，当CRH被最高20%的MO替代时，桉树幼苗的营养生长达到最优水平。据此，咖啡磨渣可作为替代组分应用于桉树育苗基质的配制。