Sugarcane bagasse amendment improves the quality of green waste vermicompost and the growth of Eisenia fetida

Highlights

•Earthworms were able to convert green waste into more plant-available nutrients.

•The part of heavy metals content increased in the compost added by earthworm.

•The addition of SCB to GW did enhance earthworm biomass and humic acid content.

•The resulting vermicomposts were characterized by neutral pH and lower EC value.

Abstract

Vermicomposting is a feasible method for disposing of lignocellulosic waste while generating a useful product. The current study assessed the potential of vermicomposting green waste mixed with sugarcane bagasse in proportions of 25%, 50%, and 75% (v:v, based on dry weight). The suitability was evaluated based on the agrochemical properties, earthworm biomass, and phytotoxicity. The final vermicomposts exhibited near-neutral pH values (7.1–7.6), and lower EC values (0.43–0.72 mS/cm) and C:N ratios (14.1–19.9).The content of available nutrients and CEC for all the vermicomposts exceeded those of the control compost (without earthworms). For vermicomposts, the average values of NO₃^–-N, AP, AK, and CEC were 53, 517, 1362 mg/kg, and 158 cmol/kg, respectively. The total contents of heavy metals increased in all vermicompost treatments compared to control composts with the following average final percentages: Zn (2.0%), Cr (15.5%), Pb (23.4%), and Cu (44.3%), but these amounts were safe for application in agroforestry. The addition of sugarcane bagasse to green waste significantly increased the content of total humic substance, humic acid and urease activity, acid and alkaline phosphatase activity, and Eiseniafetida reproduction. The addition of 25% sugarcane bagasse to green waste decreased the toxicity to germinating seeds. These results revealed that vermicomposting is a feasible way to degrade green waste into a value-added chemical product.

Graphical abstract

Keywords

Green waste / Earthworms / Sugarcane bagasse / Vermicomposting / Nutrient recovery

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Acknowledgements

This work was funded by the National Forestry Public Welfare Project of China (Grant No. 201504205).

Electronic Supplementary Materialƒ

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-020-1240-2 and is accessible for authorized users.

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