Distribution of humic substances and organic matter fraction: effects of long-term application of vermicompost

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Published: Jul 15, 2025
DOI: https://doi.org/10.63369/ijat.2025.21.4.1617-1628
Keywords:
Carbon C-stock Humification Soil depth

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Utami, K.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia
Muktamar, Z.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia
Barchia, F.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia
Gusmara, H.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia
Sucahya, H.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia
Salim, H.
Department of Soil Science, Faculty of Agriculture, University of Bengkulu, Bengkulu, Indonesia

Abstract

The results indicated that long-term fertilization with vermicompost presented a positive correlation for fulvic acid more than humic acid. Fulvic acid as a part of humic substances can predict metal existence and its bioavailability in soil. In depth of 0-20cm, content of fulvic acid about 6.72 to 9.87%, higher than 20-40 cm about 3.78 to 6.84%. In vermicompost utilization, application 25 Ton ha-1 was not significantly differed from 5 Ton ha-1. Meanwhile, organic carbon started ranged 3.29 to 5.32% and 2.59 to 3.64% on soil depth 0-20cm and 20-40cm, respectively. Carbon stock at 0-20cm ranged about 53.02 to 88.29% and 34.02 to 64.30% at 20-40cm. Carbon, it consisted of total organic carbon (carbon stock) and lignin that caused a primary effect on humification processed. A positive correlation between level dose of vermicompost and soil depth for soil pH, fulvic acid, organic carbon, total nitrogen, carbon stock, and lignin showed that organic fertilizer can give a positive impact to remain soil health and quality.

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How to Cite
Utami, K., Muktamar, Z., Barchia, F., Gusmara, H., Sucahya, H., & Salim, H. (2025). Distribution of humic substances and organic matter fraction: effects of long-term application of vermicompost. International Journal of Agricultural Technology, 21(4), 1617–1628. https://doi.org/10.63369/ijat.2025.21.4.1617-1628
Issue
Vol. 21 No. 4 (2025): July
Section
Original Study
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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