Properties of Humic Substances in Composts Comprised of Different Organic Source Material

堆肥 蚯蚓粪 有机质 腐植酸 肥料 绿色废弃物 废弃物 木灰 化学 肥料 机械生物处理 城市固体废物 营养物 环境化学 鸡粪 总有机碳 废物管理 农学 有机化学 工程类 废物收集 生物
作者
Marge Lanno,Māris Kļaviņš,Oskars Purmalis,Merrit Shanskiy,Anu Kisand,Mait Kriipsalu
出处
期刊:Agriculture [MDPI AG]
卷期号:12 (11): 1797-1797 被引量:19
标识
DOI:10.3390/agriculture12111797
摘要

Reusing organic waste as fertilizer is one method to reduce the use of mineral fertilizers and minimize waste disposal in landfills. Regulations have been enacted for the processing of organic waste and for recycling end products, but the humic content of organic fertilizers has been neglected. We studied seven composts with different organic input materials and technologies. Humic substances (HSs) were detected in all composts. The total organic carbon in the HSs constituted 8.7 ± 0.1% (SD)–27.0 ± 0.2% of the compost dry matter. Spectral differences between the studied samples in FTIR spectroscopy could be observed at 1700–1000 cm−1, indicating differences in compost precursor material. The EEM peak, associated with humic acids (HAs), was high in composts containing animal by-products (e.g., fish waste, horse manure, and kitchen biowaste). Kitchen biowaste, also when processed by Hermetia illucens larvae and vermicompost, exhibited slower organic material transformation with low humic acid/fulvic acid ratios (<1.60). The results show the importance of source material origin and amendments, which influence the composting process and final products. Our study emphasizes the role of humic substances in the comprehensive evaluation of composts. To maximize the added value of composts, marketing strategies should consider determining the share of humic substances besides the content of organic matter and nutrients.

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