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Faculty of Agriculture, University of Lampung, Jl. Sumantri Brojonegoro No. 1, Bandarlampung 35145, Indonesia
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Journal of Tropical Soils
Published by Universitas Lampung
ISSN : 0852257X     EISSN : 20866682     DOI : http://dx.doi.org/10.5400/jts.v25i1
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
Journal of Tropical Soils (JTS) publishes all aspects in the original research of soil science (soil physic and soil conservation, soil mineralogy, soil chemistry and soil fertility, soil biology and soil biochemical, soil genesis and classification, land survey and land evaluation, land development and management environmental), and related subjects in which using soil from tropical areas.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Konservasi Alam dan Lahan
Articles 5 Documents
 1 
Search results for , issue "Vol. 31 No. 1: January 2026 (In Progress)" : 5 Documents clear
Soil Organic Carbon in Typic Hapluderts on Different Slopes and Land Uses Aulia, Shofiana Kholifatul Fathonah
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

Organic carbon is a key component in the carbon cycle and plays a crucial role in determining soil quality. This research aimed to determine the soil organic carbon content on different slopes and land uses in Candirejo Village, Semin District, Gunungkidul Regency. Soil samples were taken by creating soil mini-pits to collect two samples in ten locations based on soil color differences as well as from the plow layer at depths of 0-10 cm and 10-20 cm. A field work was conducted using a survey method on the Typic Hapluderts with varying slopes and land uses. Soil analysis were: organic carbon using the Walkley and Black method, soil texture using the pipette method, soil bulk density using the volumetric ring method, pH H2O using the potentiometric method, and soil color using the Munsell method. The results indicated that soil organic carbon levels varied across different slopes and land uses. Average organic carbon content on flat slopes was 1,64% (low), on gentle slopes it was 1,21% (low), while the land uses content from highest to lowest was in forests 2,19% (medium), in shrublands 1,55% (low), in settlements 1,31%, in dry lands 1,20% (low), and in paddy soils 0,86% (very low). Slope did not significantly influence soil organic carbon levels. However, land use significantly influences soil organic carbon levels, resulting in significant differences in soil organic carbon content. Soil color coordinate L* (lightness) is linearly negatively correlated with soil organic-C with a value of r = 0,641. Soil organic carbon showed a strong and significant relationship with soil color coordinate L* (lightness). Higher soil organic carbon content led to lower L* values, indicating darker soil color.Keywords: Land use, organic carbon, slope, Typic Hapluderts
Flux of Nutrient Leaching from Ultisol of Pineapple Plantation Ameliorated with FABA and Compost and Its Implications on Fertilizer Management Alayya, Nahdlia Putri; Iskandar, Iskandar; Sudadi, Untung
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

ABSTRACTUltisol is a weathered tropical soil order with low fertility status. It is also prone to nutrient leaching processes. Plantation area of PT. Great Giant Pineapple (PT GGP), which is dominated by Ultisol, has been intensively cultivated for pineapple in rotation with banana and cassava for decades.  This study aims to evaluate the effects of FABA+compost amelioration on nutrient leaching from Ultisol of PT GGP area and its fertilizer management implications. A nutrient leaching simulation through percolation experimentation had been conducted using soil samples of 0-20 cm layer taken from the pineapple-cultivated field plots 9 months after the treatment application or one month before the plant regenerative-phase forcing step was done. Percolations were done every 7 days with 170 mL aquadest 0,75 kg-1 soil for 35 days experimental period, which was equivalent to the monthly-average of the six wet-months’ rainfall in the study area. The amelioration evaluated reduced significantly the soil nutrients leached in terms of tmax, total flux, and flux proportion. The band-application of 25 ton.ha-1 FABA+compost gave the best results. The NO3 and K leaching flux proportions, however, were still high. It is suggested to consider the use of controlled release fertilizers to reduce the nutrient leaching flux.Keywords: fertilizer management, flux proportion, percolation, total flux, tmax
ENHANCING THE SANDY SOIL NITROGEN CONTENT OF THE SAMAS COASTAL AREA USING ANAEROBIC DIGESTION SLUDGE DERIVED FROM PALM OIL MILL EFFLUENT Wardani, Nina Anggita; Lisan, Ahmad Rif'an Khoirul; Amalia, Dwi; Dewanti, Tesa Oktafira; Pratama, Aldy Putra; Putra, Rizki Amanda; Yudhanto, Katon Dwi; Azzahra, Hilmaniya Shofia
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

Sandy coastal soils, characterized by poor fertility and low nitrogen (N) content, present significant challenges for sustainable agriculture. This study investigates the potential of anaerobic digestion (AD) sludge derived from palm oil mill effluent (POME) as an organic amendment to enhance soil N in Samas Beach’s degraded sandy soils. Using a completely randomized design (CRD), six digestate application rates (0–800 mL/kg soil) were tested over a 30-day incubation period. Results demonstrated a strong linear dose-response relationship (R² = 0.995), with the highest treatment (A5: 800 mL/kg) increasing soil N by 140% (0.005% to 0.012%) compared to the control. The Kjeldahl method confirmed efficient mineralization of organic N into plant-available NH₄⁺ and NO₃⁻, supported by microbial activity from cow dung inoculum. Tukey’s HSD test revealed all treatments significantly improved N content (p < 0.05), with 400 mL/kg (A4) identified as the optimal rate—balancing efficacy (0.011% N) with economic and environmental practicality. This study highlights POME-derived sludge as a cost-effective, sustainable alternative to synthetic fertilizers for rehabilitating coastal soils, aligning with circular economy principles by valorizing agro-industrial waste.
MODEL OF THE RELATIONSHIP BETWEEN SELECTED THE SOIL PHYSICAL PROPERTIES OF OIL PALM SOIL Hermawan, Bandi; Putri, Elsa Lolita; Utami, Wanda Afrilia; Prawito, Priyono
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

Soil, water, and plants are interrelated elements in agricultural production. An in-depth understanding of the characteristics and interactions of these three aspects is essential in effective agricultural system management. The study aims to examine the relationship of soil capacity to hold water to different levels of land slope and identify the physical characteristics of the soil that affect it. The research was conducted in a community oil palm plantation in Talang Tengah I Village, Pondok Kubang District, Central Bengkulu Regency, Bengkulu Province. The method used was a survey with purposive sampling at five different slope levels, namely flat (0-8%), sloping (8-15%), slightly steep (15-25%), steep (25-45%), and very steep (45-100%). The data was statistically analyzed using the Partial Least Squares Structural Equation Modelling (PLS-SEM) method with WarpPLS 7.0 software. The results showed that slope had a significant effect on various soil physical characteristics and soil water holding capacity. The steeper the slope, there is a decrease in soil permeability, total pore space, and C-Organic soil, and an increase in soil volume weight, which results in a decrease in soil water holding capacity. The resulting model shows the agreement in describing the relationship between variables, where slope affects organic matter, sand %, and permeability, and then volume weight affects total pore space and permeability, which in turn effects the soil’s capacity to hold water.
Distribution of Soil organic carbon of volcanic soil along elevation gradient on Kaba Volcano Bengkulu Province Candra, I Nyoman; Parta Wijaya, Denny; Elvia, Rina
JOURNAL OF TROPICAL SOILS Vol. 31 No. 1: January 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i1.%p

Abstract

Climate change is a global issue primarily driven by increased carbon dioxide levels in the atmosphere. Numerous studies have been conducted to reduce carbon dioxide emissions as a strategy to mitigate its effects. Soils, particularly volcanic soils, are known to store significant amounts of carbon - second only to deep-sea reservoirs. This study aims to investigate the soil organic carbon content distribution of volcanic soils along elevation gradient on Kaba Volcano in Bengkulu Province, Indonesia. Nine soil samples, both disturbed and undisturbed, were collected at a depth of 10 cm from three locations at different elevations: the foothill (1360–1380 m a.s.l.), hillside (1610–1620 m a.s.l.), and hilltop (1930–1940 m a.s.l.). Undisturbed samples were collected using a 70-mm core cylinder to determine soil bulk density, while disturbed samples were taken with a shovel and analyzed for soil organic carbon, pH, and particle size distribution (sand, silt, and clay). The results showed that the hillside samples had the highest soil organic carbon content, while the hilltop samples had the lowest. Correspondingly, the lowest soil pH was observed at the hillside, and the highest bulk density was found at the hilltop. Particle size analysis revealed that sand and clay content at the hillside were similar to those at the foothill and both were higher than those at the hilltop. The lower soil organic carbon at the hilltop may be attributed to drier conditions and reduced vegetation cover compared to the foothill and hillside.

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