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Dermiyati
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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 5 Documents
 1 
Search results for , issue "Vol 29, No 1: January 2024 (In Press)" : 5 Documents clear
Impact of Super Absorbent Polymer and Polyacrylamide on Water Holding Capacity on Ultisol, Lampung Priyo Cahyono; Akhmad Syaifudin; Afandi Afandi; Winih sekaringtyas Ramadhani
JOURNAL OF TROPICAL SOILS Vol 29, No 1: January 2024 (In Press)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i1.%p

Abstract

Various methods of soil and water conservation in humid tropic have been carried out, one of which is by using chemicals to increase the stability of soil aggregates and water holding capacity. This experiment aims to use Polyacrylamide (PAM) and Super Absorbent Polymer (SAP) as materials to improve soil stability. The experiment was carried out in the Laboratory and Greenhouse R&D Dept. PT Great Giant Pineapple (PT GGP), Lampung. The treatment in laboratory experiments is by mixing the material into water in a ratio (g): water (ml), namely: 1 gram of material is dissolved in 100 ml of water or in a ratio of 1:100, then the next treatment is 1 gram of material in 200 ml or a ratio of 1:200, up to a ratio of 1:300 and 1:400. While the experiment in the Greenhouse is by mixing the SAP/PAM material into 100 grams of soil with a dose of 0 g (K), 4 g SAP (A) , 8.5 g (B) and 10 g (C). After the soil is mixed with the SAP material according to the dose, take 15 g and place it in a pot containing 1 kg of soil. Maintain the soil in field capacity. Based on the results of the study showed that SAP was a polymer that was able to increase the availability of water in the ultisol and sandy soils used in the experiment and was able to increase the water content of 18% compared to control (no treatment). PAM where this material is a polymer whose function is more dominant as an adhesive for aggregates instead of a water binder. Both of these materials can function as chemicals that can be used for chemical soil conservation.
Impact of Reforestation After Forest Fire on Infiltration and Other Soil Physical Properties Iva Dewi Lestariningsih
JOURNAL OF TROPICAL SOILS Vol 29, No 1: January 2024 (In Press)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i1.%p

Abstract

Forest fires have become important issue cause various hydrometeorological disasters. Efforts have been carried out by many parties. This study aims to analyze the impact of land covers as a result of reforestation on infiltration rate and other soil physical properties related to hydrological condition. The research was conducted in the Cempaka Forest area. There are four observed land covers i.e., Timber Forest Products (TFP), Non-Timber Forest Products (NTFP), Pine and Shrub. The results showed that land cover had a significant effect on the infiltration rate (p <0.05). The infiltration rate of Pine was not significantly different from NTFP, but significantly different from TFP and Shrubs. The infiltration rate of Pine, NTFP, TFP, and Shrub land cover were 76.2 cm.hour-1, 48.1 cm.hour-1, 32.7 cm.hour-1, and 40.0 cm.hour-1, respectively. The infiltration correlated with soil bulk density at two depths (0-15 cm and 16-30 cm) with r values of 0.614 and 0.595, respectively. Infiltration rate also significantly correlated with water content at pF 0 and pF 2.5 in the second soil depth. Additionally, soil bulk density is correlated with soil particle density with r  = 0.621. Soil particle density also correlated with clay content with r equal to 0.726.
Utilizing FABA and Lignite In Compost to Improve Ultisol Chemical Properties Fadil Fajarindo; Suwardi Suwardi; Iskandar Iskandar; Atfritedy Limin
JOURNAL OF TROPICAL SOILS Vol 29, No 1: January 2024 (In Press)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i1.%p

Abstract

Continuous monoculture activities can cause soil degradation, leading to low pH, organic matter content, and nutrient deficiencies in Ultisol. Composting has been proposed to improve soil fertility, but its effectiveness has been limited. This study aimed to investigate the effect of adding FABA and lignite to compost on the chemical properties of degraded Ultisol planted with pineapple. The study was conducted at Pineapple plantation in Central Lampung using a split-plot design with the application technique (row or spread) as the main plot and three treatments as subplots: 100% compost (K), 75% compost + 25% FABA (KF), and 70% compost + 20% FABA + 10% lignite (KFL). The ameliorants were applied at 50 tons ha-1. Fly ash:bottom ash ratio is 6:1. The results showed that adding FABA and lignite to compost effectively increased the organic carbon (C), pH, base saturation (BS), exchangeable calcium (Ca), magnesium (Mg), sodium (Na), and zinc (Zn), while decreasing the aluminium (Al) saturation of Ultisol. The application of ameliorants in rows was more effective than spreading. These findings suggest that adding FABA and lignite to compost in row application can effectively improve the chemical properties of degraded Ultisol.
Dynamics of Tropical Peatlands Characteristics and Carbon Stocks as Affected by Land Use Conversion and Ages of Land Use in Riau Province, Indonesia Gian Juliano; Suwardi Suwardi; Untung Sudadi
JOURNAL OF TROPICAL SOILS Vol 29, No 1: January 2024 (In Press)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i1.%p

Abstract

Indonesia's tropical peat plays a vital role in world environmental issues in addition to economic and social interests, but the dynamics and patterns of relationships between the characteristics of Indonesian tropical peat involving a function of time (ages of land use) in the context of land conversion have not been widely reported. The effects of tropical peatland use change are generally discussed regarding carbon emissions, with the limited literature identifying dynamic soil characteristics as these changes occur. This study uses a survey method. We identified the physical, chemical, and carbon stock characteristics of peat in forest locations, oil palm plantations with a land use age of 0-5 years; >5-10 years; >10 years, and agricultural land with a land use age of 0-5 years and >5-10 years to find out the dynamics of soil characteristics. Land use changes from peat swamp forests to oil palm plantations and agricultural land and the longer the age of land use results in an increase in bulk density (BD), ash content, pH, total-N, total-P2O5, total-K2O, but there is a decrease in water content, fiber content, org-C, E400/E600, and soil carbon stocks. The alignment of economic, social, and ecological interests is directed to water and land management by regulating the area's hydrological system and increasing peat stability. Applying mineral soils with high iron content and ameliorants containing polyvalent cations is necessary to form chelates and complexes with organic matter from peat soils, making them more stable against decomposition.
Assessing Leaching Requirement of an Ameliorated Saline Soil in a Lysimeter Experiment Cahyoadi Bowo; Vivi Fitriani; Marga Mandala
JOURNAL OF TROPICAL SOILS Vol 29, No 1: January 2024 (In Press)
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2024.v29i1.%p

Abstract

Soil salinity problems in the coastal hinterland region of East Java diminish agricultural development and land productivity. Soil leaching is expected to reduce soil salinity. This study investigated the effectiveness of different ameliorant compositions and leaching requirements (LR) in the leaching process. The experiment involved applying ameliorants (T) and leaching (L) treatments to lysimeters filled with saline soil. The ameliorant treatments included biochar, organic matter, and gypsum. The results showed the leaching requirement capacity to reduce electrical conductivity from 5.7 dS.m-1 to below 2 dS.m-1. Leaching for T0 (without ameliorants) and T1 (with 10 Mg.ha-1 of biochar) required 943 mm of water, while T2 (20 Mg.ha-1 of biochar) and T3 (40 Mg.ha-1 of compost) required 1052 mm. The T4 (10 Mg.ha-1 of compost and 2 Mg.ha-1 of gypsum) necessitated 1154 mm of leaching water. The ameliorants' application and assortment increased the water demand for leaching. Thus, the study suggests applying soil ameliorants after completing the leaching process. The findings indicated a consistent relationship between TDS and salinity, indicating the soil's dominant presence of salty ions. Surprisingly, no correlation was observed between soil pH and EC. This research explores soil salinity reduction methods in coastal areas and their implications for coastal agriculture development.

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