REUTILIZATION OF RESIDUES AS COMPONENTS OF SUBSTRATE FOR THE PRODUCTION OF Eucalyptus grandis SEEDLINGS

ABSTRACT Increased production of agro-industrial waste is a global concern, requiring proper disposal. In this sense, they can represent alternative sources for substrate production, adding value to the materials and reducing the cost of seedlings in the nursery. However, their proportions in the mixture should be adequate for better use of water and nutrients, ensuring better seedling quality. The objective of this study was to identify the potential of rice husk and peach kernel residue, as a secondary substrate component, for the production of Eucalyptus grandis seedlings. The carbonated (CRH), hydrolyzed (HRH) rice husk and crushed peach kernel (CPK) were added at 0, 10, 20 and 30% to an organic substrate. The results were submitted to analysis of variance and correlation analysis between the variables of the substrates and the morphological and physiological attributes. The results indicated that the HRH and CPK can add value to the agro-industrial residue when mixed to the organic compound in proportions of 20 and 10%, respectively, being adequate and compatible with the use of CRH in the proportion of up to 30%. Eucalyptus grandis seedlings, after 90 days of cultivation, presented quality to be hardened and dispatched when grown on organic compound substrates with up to 30% CRH, 20% HRH and 10% CPK.摘要 农业工业废弃物产量攀升已成为全球性环境关切，亟需开展无害化妥善处置。在此背景下，此类废弃物可作为基质生产的替代原料，实现物料增值并降低苗圃育苗成本。然而，其在混合基质中的占比需适配合理，方能更高效地利用水分与养分，保障育苗品质。本研究旨在明确稻壳与桃核残渣作为次级基质组分，用于巨桉（Eucalyptus grandis）育苗的潜力。将碳化稻壳（CRH）、水解稻壳（HRH）与粉碎桃核（CPK）分别以0%、10%、20%、30%的比例添加至有机基质中。对所得试验结果开展方差分析与基质变量、形态及生理属性间的相关性分析。研究结果显示，当水解稻壳与粉碎桃核分别以20%与10%的比例混入有机基质时，可实现农业工业废弃物的增值；且该配比与最高30%占比的碳化稻壳兼容适配。经90天培育后，在添加最高30%碳化稻壳、20%水解稻壳与10%粉碎桃核的有机基质中生长的巨桉幼苗，其品质可达到炼苗与出圃标准。