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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 4 Documents
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Search results for , issue "Vol. 31 No. 2: May 2026 (In Progress)" : 4 Documents clear
LAND EVALUATION AND SUITABILITY FOR DEVELOPMENT OF SORGHUM (SORGHUM BICHOLOR L.) ON PEAT LAND Juniarti, Juniarti
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

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

Abstract

Sorghum is a perennial food crop that has great potential for development in Indonesia. The development of sorghum will increase land productivity, supporting the development of sustainable agriculture and enhancing Indonesian food production. The research findings establish sorghum as an ideal choice for enhancing the productivity of arid, acidic, or otherwise unproductive lands, including former mining areas reclaimed. Through the assessment of land characteristics suitable for sorghum development as a biomass energy crop in West Sumatra, Indonesia, this research endeavors to facilitate the sustainable growth of sorghum cultivation within the region. This research aims to evaluate the suitability of land for sorghum (Sorghum bicolor L.) in West Sumatra, Indonesia. Regency uses purposive sampling and survey methods. The results showed that peatland in West Sumatera, Indonesia has potential for the development of sorghum plants with average temperature characteristics 25-27 º C, rainfall <200 mm, air humidity <75%, good drainage, soil depth of peatland > 60 cm, pH 4.4 - 5.1 but low N, P and K nutrient availability.
Modification of Peatlands Amendment with Dolomite and Fly Ash Zulkarnaini, Zulkarnaini
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

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

Abstract

High acidity levels and low availability of alkaline elements such as Ca, Mg, and K inhibit plant growth and reduce land productivity. This study examined the effect of dolomite and fly ash doses on the chemical properties of peatland. This study used a 2 x 3 randomized block design (RBD) factorial design with three replicates. The first factor was the type of soil conditioner, namely dolomite and fly ash. The second factor was the dose of soil conditioner, namely 5, 10, and 15 tons/ha. The effect of the type of soil ameliorant did not interact significantly with the dose of soil conditioner on pH, water content, organic C, total N, K, P, Fe, Cu, Zn, Mg, Ca, K-exch, and humate. Dolomite was superior in increasing base elements (Ca, Mg, and K) and the humification process of organic matter, while fly ash played an important role in increasing microelements (Fe, Cu, Zn) and carbon stabilization. Meanwhile, an ameliorant dose of 15 tons/ha significantly affects the increase in pH, moisture content, organic carbon, and macro nutrients (P and K). Dolomite and fly ash at an optimal dose of 15 tons/ha are recommended as a sustainable amelioration strategy to increase pH, chemical fertility, and carbon stability in peat soils without causing negative environmental impacts.
Application of Organic Fertilizer Enriched Microbia and Biochar in Various Land Management Systems on Total N, Available P, and Available K in Pineapple Plantations ramadhani, Winih sekaringtyas
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 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
JOURNAL OF TROPICAL SOILS Vol. 31 No. 2: May 2026 (In Progress)
Publisher : UNIVERSITY OF LAMPUNG

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

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 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 pH₀ and significantly increased cation exchange capacity (CEC) and net negative charge, indicating improved soil reactivity. In contrast, CaCO₃ increased pH₀ and reduced negative charge. These findings support the strategic use of organic amendments to enhance soil fertility and sustainability.

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