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All Journal JTSL (Jurnal Tanah dan Sumberdaya Lahan) Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management)
Putri, Elsa Kumala
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science

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Amelioration of Potassium Humate as Ligand Exchanger for Adsorbed P Fractions and their Relationships with Chemical Properties of an Indonesian Andisol Putri, Elsa Kumala; Suwardi, Suwardi; Sudadi, Untung
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 14 No 4 (2024): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.14.4.875

Abstract

Andisols are specifically characterized by a very high P adsorption capacity owing to their acidic reaction and dominance of variable-charged clay minerals. This crop cultivation problem can be overcome by potassium humate amelioration intended to exchange the adsorbed soil P fractions into the more available (labile) forms. This study aims to evaluate the effects of potassium humate application at 0, 20, 40, and 60 kg ha-1 on the dynamics of P fractions and their relationships with the chemical properties of an Indonesian Andisol. Using the Tiessen and Moir procedure, PH2O, PNaHCO3-Pi-Po, PNaOH-Pi-Po, and PHCl fractions were obtained in topsoil (0–30 cm) and subsoil (30–60 cm) samples 16 weeks after the treatment. The organic soil P (PPo) fractions tended to increase and were attributed positively to total P and negatively to base saturation (BS) at the topsoil, whilst the subsoil PPo fractions tended to increase with the decreasing soil BS. At 60 kg ha-1, the potassium humate application effectively decreased PPo and increased PPi fractions in the subsoil. The results also revealed that humic acid component of potassium humate was an effective organic ligand exchanger for the adsorbed PPo fractions that simultaneously altered soil anion-cation equilibrium in the studied Andisol. As an implication, soil P availability was increasing.
SOIL FAUNAL DIVERSITY AS A BIOINDICATOR OF SOIL HEALTH ACROSS DIFFERENT LAND-USE TYPES Juliano, Gian; Mahardika, Rabbirl Yarham; Hidayah, Anggraeni Nur; Mardhiah, Mira; Alayya, Nahdlia Putri; Prayudi, Haikal Caesa; Putri, Elsa Kumala; Sulistiyawati, Dita; Dirman; Sagala, Mariyetha; Gusviani, Nisa Azzahra
JTSL (Jurnal Tanah dan Sumberdaya Lahan) Vol. 13 No. 1 (2026)
Publisher : Departemen Tanah, Fakultas Pertanian, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtsl.2026.013.1.13

Abstract

This study examines soil mesofauna and macrofauna as bioindicators of soil health and ecological integrity across three land-use systems: oil palm plantations, open lands, and bamboo forests. Land-use change increasingly threatens soil biodiversity and ecosystem functioning in tropical regions, where soil organisms are key to nutrient cycling, aggregation, and ecological resilience. Understanding how land use influences soil faunal communities is crucial for assessing belowground integrity. Despite their critical ecological roles, soil faunal indicators are rarely integrated into soil health assessments in tropical systems. Addressing this gap, this study compares soil mesofauna and macrofauna diversity across contrasting land uses to establish their potential as reliable bioindicators. Soil samples were collected from the surface layer (0–10 cm) using standardized coring under uniform topography, soil type, and climate. Systematic random sampling was applied, with mesofauna extracted using Berlese-Tullgren funnels and macrofauna extracted by manual hand-sorting following the TSBF method. Specimens were identified to the order level. Shannon-Wiener analysis showed that bamboo forests supported the most complex and functionally rich communities (mesofauna H′ = 1.498; macrofauna H′ = 0.309), followed by oil palm plantations and open lands. Acari and Collembola were dominant mesofauna sensitive to habitat quality, while Formicidae and Diplopoda reflected higher trophic and structural roles. Open lands exhibited low diversity and dominance of stress-tolerant taxa, indicating reduced ecological function. The integrated assessment of mesofauna and macrofauna provides a robust framework for evaluating soil health, highlighting vegetation complexity as a driver of nutrient cycling, aggregation, and microbial activity.
Co-Authors Alayya, Nahdlia Putri Dirman Gian Juliano Gusviani, Nisa Azzahra Hidayah, Anggraeni Nur Mahardika, Rabbirl Yarham Mardhiah, Mira Prayudi, Haikal Caesa Sagala, Mariyetha Sulistiyawati, Dita Suwardi Suwardi Untung Sudadi