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Faculty of Agriculture, University of Lampung, Jl. Sumantri Brojonegoro No. 1, Bandarlampung 35145, Indonesia
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INDONESIA
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 825 Documents
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Application of Organic Fertilizer Enriched Microbia and Biochar in Various Land Management Systems on Total N, Available P, and Available K in Pineapple Plantations Winih sekaringtyas ramadhani
JOURNAL OF TROPICAL SOILS Vol. 31 No. 3: September 2026 (in Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i2.%p

Abstract

The decline in pineapple production in Lampung is closely related to soil degradation. The purpose of this study was to study the soil management system and the effects of soil management and organic fertilizer application, influenced by microbes and biochar, on the availability of nitrogen, phosphorus, and potassium nutrients in the soil in pineapple plantations. The study was conducted at PT Great Giant Pineapple (GGP), and soil analysis was conducted at PT GGP's R&D center. The study used a split plot design with 8 treatments and 3 replications. The main plot consisted of the T1 soil management system (plough the land to a depth of 30 cm + chop the pineapple litter 1 time and T2 (plough the land to a depth of 40 cm + chop pineapple litter 2 times. Subplots consist of organic fertilizer influenced by microbes and biochar P1(GGP compost 50 tons ha-1), P2 (GGP compost 40 tons ha-1+biochar 10 tons ha-1), P3 (GGP premium compost 50 tons ha-1), and P4 (GGP premium compost 50 tons ha-1+LOB microbes 40 L ha-1). The results of the study showed that the T treatment P1 increased the total N content of the soil in plants aged 6 MAP to 9 MAP by 0.03%, but was not significant at 3 and 6 MAP. Treatment T1P1 increasing soil available P from 3 MAP to 6 MAP 23.77 ppm. Treatment T1P1 and T2P3 increased soil available K from 3 MAP to 6 MAP by 19.77 ppm and 11.06 ppm, respectively. There was no interaction between T1P1 in increasing soil nutrients. However, there is an interaction between T1P1 in increasing the total N, available P, and available K of the soil. The correlation test showed a positive correlation between pH and available K in the 3rd MAP observation, organic C with total N in the 6th MAP observation, and a negative correlation between organic C and available P in the 9th MAP observation. The implementation of T1P1 addition of biochar contained in compost 50 GGP ton ha-1 with 30 cm tillage and 1x shredding of plant litter increases soil N, P, and K.
Effect of Amendments on Soil Charge Characteristics in Sub-Optimal Dryland of Aceh Besar, Indonesia Sufardi Sufardi; Teti Arabia; Khairullah Khairullah; Tri Chairina
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i2.93-104

Abstract

Soil colloids play a critical role in controlling chemical behavior, particularly in tropical sub-optimal drylands dominated by variable-charge soils. However, information on the comparative effects of organic and inorganic amendments on soil charge characteristics across different soil orders remains limited. This study aimed to evaluate the effects of compost, biochar, CaCO3, and Superphosphate fertilizer (SP-36) on the charge characteristics of tropical dryland soils. Nine amendment combinations were applied to topsoil (0–20 cm) from Andisols (Saree), Inceptisols (Cucum), and Ultisols (Jantho), followed by incubation for 60 days at 25–27 °C under field capacity conditions. Soil charge parameters were analyzed before and after incubation. Results showed that amendment type and rate significantly affected soil charge characteristics, with responses varying among soil orders. Organic amendments (15–30 t ha-1) and SP-36 (2–4 t ha-1) decreased pH€  and significantly increased cation exchange capacity (CEC) and net negative charge, indicating improved soil reactivity. In contrast, CaCO3  increased pHo  and reduced negative charge. These findings support the strategic use of organic amendments to enhance soil fertility and sustainability.
Land Suitability Evaluation for Sugarcane (Saccharum officinarum L.) Cultivation in the Rejoso Watershed, Pasuruan Regency Bambang Hermiyanto; Ani Acfiyatul Fardila; Cahyoadi Bowo; Basuki; Subhan Arif Budiman
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i2.57-69

Abstract

Land suitability evaluation is essential for optimizing crop productivity and promoting sustainable land use. In the Rejoso Watershed, Pasuruan Regency, sugarcane production remains suboptimal due to limited integration of biophysical land characteristics into cultivation management. This study aims to assess land characteristics, classify land suitability, identify limiting factors, and provide land management recommendations for sugarcane cultivation. The analysis considered key variables including temperature, rainfall, drainage, soil texture, effective depth, cation exchange capacity (CEC), base saturation, pH (H2O), organic carbon, total nitrogen, available phosphorus (P2O5), available potassium (K2O), slope, erosion risk, and flood risk. Land suitability was evaluated using a matching approach based on the Buku Pedoman Penilaian Kesesuaian Lahan Komoditas Strategis Year 2016. The results showed that actual land suitability comprises class S3 (Marginally Suitable), covering 22.262 ha (64.3%), and class N (Not Suitable), covering 12.342 ha (35.7%). Potential land suitability includes class S2 (Moderately Suitable), covering 8.562 ha (24.7%); class S3, covering 13.701 ha (39.6%); and class N, covering 12.342 ha (35.7%). The main limiting factors identified were temperature, drainage, soil texture, effective depth, nitrogen, phosphorus, base saturation, slope, erosion risk, and flood risk. Recommended management strategies include improving drainage using the Reynoso system, applying dolomitic lime, and SP36 fertilizer. Overall, the Rejoso Watershed demonstrates substantial potential for sugarcane development through improved land management. contributing to national sugar self-sufficiency.
Maize nutrient translocation on artisanal gold mining soil ameliorated with EFB compost, clay, and lime Deno Okalia; Iskandar; Budi Mulyanto; Untung Sudadi
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i2.71-81

Abstract

Artisanal gold mining generally produces coarse-textured soils with low nutrient-holding capacity, which limit plant growth and productivity. Soil reclamation in these conditions necessitates not only improved soil quality but also effective nutrient uptake and allocation within the plant. This study aims to evaluate the effects of oil palm empty fruit bunch (EFB) compost, clay soil, and lime, used as soil conditioners, on the concentrations of N, P, and K in various maize organs grown in soil formerly used for artisanal gold mining. The study was conducted in experimental pots using a completely randomized factorial design (CRF) with three factors: A) EFB compost at 6, 12, and 18 t ha-1; B) clay at 10 and 20%; and C) lime at 0.5 and 1.0 t ha-1. After harvest, maize plants were separated into roots, stems, leaves, and grain, and tissue concentrations of N, P, and K were determined. The results showed clear organ-specific patterns of nutrient accumulation. The highest N concentration was found in the grain (1.95%), the highest P in the roots (0.37%), and the highest K in the leaves (3.07%), all under treatment A3B1C1 (18 t ha-1 of EFB compost, 10% clay, and 0.5 t ha-1 of lime). The findings suggest that using EFB compost, clay soil, and lime together can effectively improve nutrient availability, uptake, and partitioning in maize grown on post-gold mining soil. This strategy has the potential to support the productive reuse of degraded artisanal gold mining land.
Production and Chemical Characterization of Biochar–Fly Ash Enriched Compost for Tropical Acid Soil Ameliorant Herdhata Agusta
JOURNAL OF TROPICAL SOILS Vol. 31 No. 3: September 2026 (in Progress)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts..v31i3.%p

Abstract

Pineapple cultivation systems are produced in large quantities but are not optimally utilized. One widely used source of organic matter is compost. Biochar has received considerable attention as a functional amendment in the composting system. In addition to biochar, fly ash – a byproduct of coal combustion in thermal power plants – has emerged as a potential mineral additive for composting systems. The evaluation included temperature dynamics during production, moisture content, pH, N-total, C/N ratio, and macronutrient content at a predetermined observation time. The trial was structured using a single-factor Group Random Design with seven formulas and four replicates. Treatments A, B, and C are made by mixing biochar and FA into compost raw materials at the beginning of the composting process, with a composition of 75% compost raw materials + 20% biochar + 5% FA, 75% compost raw materials + 12.5% biochar + 12.5% FA, and 75% compost raw materials + 5% biochar + 20% FA. Treatment D consists of 100% compost raw materials without the addition of biochar and FA. Meanwhile,  the E, F, and G treatments are made by mixing biochar and FA into mature compost, with a composition of 75% compost + 20% biochar + 5% FA, 75% compost + 12.5% biochar + 12.5% FA, and 75% compost + 5% biochar + 20% FA. The treatment of 75% compostable raw materials, 5% biochar, and 20% fly ash at the beginning of the composting process shows the greatest potential balance, combining early enrichment with a high macronutrient content, an appropriate pH, and a final C/N ratio.

Page 83 of 83 | Total Record : 825

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