cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Dermiyati
Contact Email
dermiyati.1963@fp.unila.ac.id
Phone
+62721781822
Journal Mail Official
j.tnhtrop@gmail.com
Editorial Address
Faculty of Agriculture, University of Lampung, Jl. Sumantri Brojonegoro No. 1, Bandarlampung 35145, Indonesia
Location
Kota bandar lampung,
Lampung
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 12 Documents
 1   2 
Search results for , issue "Vol. 17 No. 3: September 2012" : 12 Documents clear
Root-induced Changes in the Rhizosphere of Extreme High Yield Tropical Rice: 2. Soil Solution Chemical Properties Purnomo, Erry; Choiron, Dodik; Yulia, Raina; Halim, Hakimah; Krisdianto, .; Hairani, Anna; Osaki, Mitsuru
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.189-196

Abstract

Our previous studies showed that the extreme high yield tropical rice (Padi Panjang) produced 3-8 t ha-1 without fertilizers. We also found that the rice yield did not correlate with some soil properties. We thought that it may be due to ability of root in affecting soil properties in the root zone. Therefore, we studied the extent of rice root in affecting the chemical properties of soil solution surrounding the root zone. A homemade rhizobox (14x10x12 cm) was used in this experiment. The rhizobox was vertically segmented 2 cm interval using nylon cloth that could be penetrated neither root nor mycorrhiza, but, soil solution was freely passing the cloth. Three soils of different origins (Kuin, Bunipah and Guntung Papuyu) were used. The segment in the center was sown with 20 seeds of either Padi Panjang or IR64 rice varieties. After emerging, 10 seedlings were maintained for 5 weeks. At 4 weeks after sowing, some chemical properties of the soil solution were determined. These were ammonium (NH4+), nitrate (NO3-), phosphorus (P) and iron (Fe2+) concentrations and pH, electric conductivity (EC) and oxidation reduction potential (ORP). In general, the plant root changed solution chemical properties both in- and outside the soil rhizosphere. The patterns of changes were affected by the properties of soil origins. The release of exudates and change in ORP may have been responsible for the changes soil solution chemical properties.Keywords: Ammonium, electrical conductivity, iron, nitrate, oxidation reduction potential, pH, phosphorus [How to Cite: Purnomo E, D Choiron, R Yulia, H Halim, Krisdianto, A Hairani and M Osaki. 2012. Adding Organic Matter Enhanced the Effectiveness of Silicate Rock Fertilizer for Food Crops Grown on Nutritionally Root-induced Changes in the Rhizosphere of Extreme High Yield Tropical Rice: 2. Soil Solution Chemical Properties. J Trop Soils, 17 (3): 67-74. doi: 10.5400/jts.2012.17.3.189][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.189]
The Influnece of Peat Layer on Hidrogen and Aluminium Concentration Originating from the Substratum Sulphidic Materials Fahmi, Arifin Fahmi; Radjagukguk, Bostang; Purwanto, Benito Heru; Hanudin, Eko Hanudin
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.197-202

Abstract

Much of peatland in Indonesia has sulphidic materials as substratum. Soil acidity and metal elements in peatlandmay originate from the sulphidic materials which occur underneath of the peat layer. Peat soil buffering capacity andchelating ability of the peat materials regulate the soil acidity and metal solubility in the peatland. The study wasaimed to examine the influence of peat thickness and land hydrological conditions on the concentrations ofexchangeable aluminium (Al) and hidrogen (H) in the peatland. The study was carried out on peaty acid sulphatesoil, deep peat, moderate peat and shallow peat. Exchangeable Al and H were observed in the wet season, transitionfrom wet to dry season and dry season. The results showed that exchangeables of Al and H were mainly originatedfrom sulphidic material which were occured underneath of the peat layer. Peat layer had an important role on thesolubility of Al and H in the peatland. Peat thickness had influence on exchangeable-Al and H, 50 cm of the peatthickness (shallow peat) was the critical for peat function to reduce the Al and H solubility in the peatland. Hydrologicalcondition factor did not influence on the solubility of Al and H.Keywords: Aluminium; hydrogen; peatland; sulphidic materials[How to Cite: Fahmi A, B Radjagukguk, B Heru Purwanto and E Hanudin. 2012. The Influnece of Peat Layer on Hidrogen and Aluminium Concentration Originating from the Substratum Sulphidic Materials. J Trop Soils, 17 (3): 197-202. doi: 10.5400/jts.2012.17.3.197][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.197]
The Changes of P-fractions and Solubility of Phosphate Rock in Ultisol Treated by Organic Matter and Phosphate Rock Djuniwati, Sri; Nugroho, Budi; Pulunggono, Heru Bagus
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.203-210

Abstract

Phosphorus (P) is one of the essential elements for plant, however, its availability is mostly very low in acid soils. It is well documented that application of phosphate rock and organic matter are able to change the level of availability of P-form in acid soils.  The objective of the research were to evaluate the changes of P-fractions ( resin-P, NaHCO3-Pi, and NaHCO3-Po) and phosphate rock dissolution which were induced by application of organic matter (Imperata cylindrica, Pueraria javanica, dan Colopogonium mucunoides) and phosphate rock in Utisol Lampung.  The experiment was designed in a completely randomized design with three factors and three replications.  The first factor was the types of organic matter (I. cylindrica, P. javanica, and C. mucunoides), the second factor was the rate of organic matter (0, 2.5, and 5%), and the third factor was the rate of phosphate rock (0, 40, and 80 mg P kg-1).  The results showed that in the  rate of 0 and 1% organic matter, the type of organic matter did not affect P-fraction of NaHCO3-Pi, but in the rate of 2.5 and 5%,  NaHCO3-Pi due to application of  P. javanica, and C. mucunoides higher than due to application of  I. cylindrica.  However, the increasing rate of organic matter increased NaHCO3-Pi. Then, P-fraction of Resin-Pi was affected by the type of organic matter, the rate of  organic matter, and the rate of phosphate rock, respectively. P-fraction of resin-Pi due to application of P.  javanica, and C. mucunoides was higher than due to application of  I. cylindrica, but the effect of  P. javanica, and C. mucunoides was not different.  Increasing the rate of organic matter and phosphate rock increased P-fraction of resin-Pi and NaHCO3-Pi, but P-fraction of NaHCO3-Po was not affected by all treatments.  Meanwhile, dissolution of phosphate rock was affected by the kind of organic matter and soil reaction.  In the rate of 5% organic matter, dissolution of  phosphate rock by application of                                     I. cylindrica (70%) was higher than P. javanica (26.6%), and C.  mucunoides (33.5%), but in the rate of 1%, the effect of I. cylindrica , P. javanica, and C. mucunoides were not different.Keywords: C. mucunoides; I. cylindrica; P. javanica; phosphate rock; P-fractions[How to Cite: Djuniwati S, B Nugroho, and HB Pulunggono. 2012. The Changes of P-fractions and Solubility of Phosphate Rock in Ultisol Treated by Organic Matter and Phosphate Rock. J Trop Soils, 17: 203-210. doi: 10.5400/jts.2012.17.3.203][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.203]
Ferro Content in Soil and Mustard Leave (Brassica Junjea) Treated by Agricultural Waste on the Biosensitizer-Iron Photoreduction Rorong, Johnly Alfreds; Sudiarso, .; Prasetya, Budi; Mandang, Jeany Polii; Suryanto, Edi Suryanto
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.211-218

Abstract

Atom absorption spectrophotometer (AAS) had been used to analyzed Ferro in the soil and in the green mustardleaf (Brassica junjea) treated with phenolics extract from the agricultural wastes of clove leaf (Eugenia aromatica),rice straw (Oryza sativa) and water hyacinth leaf (Eichhornia crassipessolms), in which the phenolics as the electrondonor on the biosensitizer – iron photoreduction. Phenolics extract was obtained from varions of aquadest and 40;60; 80% methanol. The solution without extract was used as sensitizer, while the extract without illumination wasused as control. Green mustard was packed into medium polybag within it added by 2,000 mg kg-1. Soil type assample was volcanic soil in various categories, such as: soil-extract, soil NPK fertilizer extract, and soil control.Results of Ferro analysis in the clove leafs treated with 80% methanol indicated the highest increasing Fe2+ of 22.94mg kg-1. Rice straw treated with 60% methanol showed the highest increasing Fe2+ of 34.5 mg kg-1. The waterhyacinth leafs treated with 60% methanol obtained the highest increasing Fe2+ of 17.67 mg kg-1. Fe2+ concentrationat soil-clove leafs had the highest increasing of Fe2+ production for 5.6 mg kg-1. Its concentration at soil NPKfertilizer extract water hyacinth leafs showed the highest increasing of Fe2+ production for 13.39 mg kg-1. Highestconcentration of Fe2+ in the green mustard at soil NPK fertilizer extract clove leafs was 176.37 mg kg-1. Variousconcentrations and various soil categories resulted in the highest increasing Fe2+ concentration in each agricultural waste extract.Keywords: Agricultural waste extract; ferro analysis; iron photoreduction; soil category[How to Cite: Rorong JA, Sudiarso, B Prasetya, J Polii-Mandang and E Suryanto. 2012. Ferro Content in Soil and Mustard Leave (Brassica junjea) Treated by Agricultural Waste on the Biosensitizer-Iron Photoreduction. J Trop Soils, 17 (3): 211-218. doi: 10.5400/jts.2012.17.3.211][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.211]
Citrate Root Exudation under Zn and P Deficiency Siane, Bless Aplena Elen
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.219-225

Abstract

Zinc and phosphorus are essential nutrients with low bioavailability in calcareous soils. Some plants exude organicacids to increase the solubility of these two nutrients. The objective of this study was to examine citrate exudation rates of different lupin (Feodora and Energy) and rapeseed (Dunkeld, Yickadee and Rainbow) cultivars under deficiencies of Zn and P. The plants were cultivated into three different nutrient solutions (complete, -Zn, and -P) with pH around 7. Under Zn deficiency, rapeseed cultivars lost about 80% of its shoot fresh weight, but the roots did not exude any organic acids such as citrate, malate or oxalate. Both lupin and rapeseed cultivars exuded citrate onlyunder phosphorus deficiency. The exudation rates of Feodora and Energy were 3.89 μmol g-1 RDW h-1 and 3.45 μmol g-1 RDW h-1, respectively, while that of Dunkeld was 15.1 μmol g-1 RDW h-1. The results indicated that lupin and rapeseed lost their production under Zn deficiency but they did not exude organic acid, while under P deficiency both plants exuded citrate.Keywords: Citrate; deficiency; exudation rate; lupin; phosphorus; rapeseed; Zn[How to Cite: Siane BAE. 2012. Citrate Root Exudation under Zn and P Deficiency. J Trop Soils, 17 (3) : 219-225. doi: 10.5400/jts.2012.17.3.219][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.219] 
Plot Scale Phosphorous and Potassium Balances of Newly Opened Wetland Rice Farming Originated from Wetland Sukristiyonubowo, .; Nugroho, Kusumo; Ritung, Sofyan
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.227-237

Abstract

Development of newly opened wetland rice fields both from dry land and wetland in Indonesia are important to meetrice growing demand, increase soil productivity, keep rural food security and provide jobs as well as generateincome. Most soils of newly opened rice fields are low in P and K contents, but the farmers do not apply P and Krecommended fertilisers. The study was conducted on newly opened wetland rice farming in Panca Agung village,Bulungan District, East Kalimantan Province, Indonesia in 2009. The aims were to evaluate phosphorous andpotassium input – out of newly opened wetland rice and to validate the P and K recommendation. Six treatmentswere tested including farmers practices (as control), farmer practices + straw compost + dolomite, NPK withrecommendation rate in which N and K was split in two applications, NPK with recommendation rate in which N andK was split three applications, NPK with recommendation rate + straw compost + Dolomite , in which N and K wassplit three applications, and NPK with recommendation rate + straw compost + dolomite, in which N and K weresplit two applications. The N, P and K rates were 250 kg urea, 100 kg SP-36 and 100 kg KCl ha-1 season-1, while thefarmer practices 100 kg urea and 100 kg SP-36 ha-1 season-1. Parameters to be measured were concentration P andK in mineral fertilizer, compost, irrigation water and grains as well as straw. The results showed that surplus Pranged from 5.75 to 12.85 kg P ha-1 season-1, meaning that SP-36 application rate was more than enough to replace Premoved by harvest product. In contrast, potassium application rate should be increased from 100 to 200 kg KClha-1 season-1 to fix K removed by harvest product. However, when the compost will also be increased to 3 Mg ha-1season-1 K fertilizer can be increased to 150 kg KCl ha-1 season-1 to substitute K taken away by rice harvest productand to keep higher rice grain yield. These P and K recommendation rate imply that total SP-36 and KCl should beavailable at district level will be about 984.9 Mg SP-36 and 1.477 Mg KCl district -1 season -1, respectively.Keywords: Newly opened wetland rice; nutrient balance; nutrient input; nutrient losses; plot scale wetland[How to Cite: Sukristiyonubowo, K Nugroho and S Ritung. 2012. Plot Scale Phosphorous and Potassium Balances of Newly Opened Wetland Rice Farming Originated from Wetland. J Trop Soils 17 (3): 227-237. doi: 10.5400/jts.2012.17.3.227][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.227] 
Response of Some Rice Cultivars in New Opening Paddy Fields with High Fe2+ Using Multi-packet Technology Utama, M Zulman Harja; Wahidi, Ismed; Sunadi, .
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.239-244

Abstract

The main obstacle to increase rice yield in new opening paddy fields, is that high levels of dissolved ferrous ions(Fe2+) which toxic to plants. This research aimed to study the growth and yield of several rice cultivars tolerant toFe2+ in the new opening paddy fields with multi-packet technology. The experiment was conducted from April toDecember 2010, at the new opening pay fields in Koto Baru of Dharmasraya District, West Sumatra. Experimentsused a factorial in a Completely Randomized Design with three replications. The first factor was, selected ricevarieties which were: Krueng Aceh; IR 36; Tukad Balian; Ciherang; and Cisokan. The second factor was thedifferent plant spacing which were a 30 × 30 cm with two seeds per hole, and Plant spacing (10 × 10) × 30 × (10 × 10)cm with one seed per hole. The rice cultivation with packet technology can improved the growth and yield of paddyrice cultivated in new opening paddy field high in Fe2+. Technology package consisting a combination of ricevariety (Krueng Aceh, IR36, and Tukad Balian) + SRI system + peat amelioran 20 Mg ha-1 + plant spacing (10 × 10)× 30 × (10 × 10) cm with one seed per hole, had the best growth and yield of rice cultivated in the new opening fieldshigh in Fe2+, especially in Koto Baru of Dharmasraya District, Krueng Aceh was a variety with the highest grain production by 5.65 Mg ha-1.Keywords: Fe2+; new fields; rice cultivar; technology[How to Cite: Utama MZH, I Wahidi and Sunadi. 2012. Response of Some Rice Cultivars in New Opening Paddy Fields with High Fe2+ Using Multi-packet Technology. J Trop Soils, 17 (3) : 234-244. doi: 10.5400/jts.2012.17.3.239][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.239] 
Improving Phosphate Efficiency by Phosphate Solubilizing Bacteria and Organic Matter Estimated by Radio Isotop (32P) Technique in Some Soils Mudjiharjati, Arie; Setiawati, Tri Candra; Pandutama, Martinus Harsanto
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.245-252

Abstract

Phosphorous (P) contents in many soils are varies highly along with their ability to provide available P to plant growth. Soils may contain very high in total P, but low in available P due to high P adsorbed by soil matrix and all their adsorbing agents. This research which using natural materials was aimed to increase P availability in some high-P absorption soils. The natural materials utilized for extracting P were organic matter, P extracting bacterial, and rock phosphate. Those materials were interacted to high P absorption soils which were: Oxisol, Inceptisol, and Andisol. The detail objectives of this research were: (1) to study the potential of P-extracting agents (organic matter, and P-extracting bacteria) in releasing P of three high P- absorption soils; (2) to quantify the -age of P coming from the treatments; (3) to calculate the efficiency of P utilization by plant; and (4) to quantify Residual P in soils. The P mobility was analyzed by radioisotope technique using KH232PO4 carrier free solution. The results showed that adding soil organic matter increased the available P by 15.24% in Oxisol, 40.18 in Inceptisol, and by 7.34% in Andisol. Plant sorption toward P from % P used efficiency(%-PUE) up to 60 days was still very low, 0.65 to 9.34%. This was in accordance with the residual P in soils which were still quite high ranging from 94% to 96% in Andisol, 91%97% in Inceptisol, and 96%-98% in Oxisol. The implication of the results of this research, however, is that the application of natural materials in improving soil P availability provides a longtimeresidual effect which could give benefit to the following crops.Keywords: Andisols; Inceptisol; Oxisols; P. diminuta; PUE;  rock phosphate[How to Cite: Mudjiharjati A, TC Setiawati and MH Pandutama. 2012. Improving Phosphate Efficiency by Phosphate Solubilizing Bacteria and Organic Matter Estimated by Radio Isotop (32P) Technique in Some Soils. J Trop Soils, 17 (3) : 245-252. doi: 10.5400/jts.2012.17.3.245][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.245]
Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan Yusran, Fadly Hairannoor
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.253-257

Abstract

Tidal fluctuation creates different soil chemical properties which is totally deviate from normal circumstances.  Organic matter decomposition occurs with limited O2 supply, hence disturbing Carbon cycle which has a central role in the process and nutrient mineralisation.  The research aimed was  to describe the relationship between organic-C and available-P due to tidal fluctuation in South Kalimantan.  Ten undisturbed composite samples were collected in top-soil and sub-soil.  Results showed that there was no direct effect from organic-C in P availability as in other mineral soils.  However, there was an indication that the relationship was influenced by maturing process of the soil.  In other words, the relationship between organic-C and available-P was typical for every type of swampland and was not related to the tidal fluctuationKeywords: Available-P, organic-C, P-transformation, tidal water fluctuation [How to Cite: Yusran FH. 2012. Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan. J Trop Soils 17 (3) : 253-257. doi: 10.5400/jts.2012.17.3.253] [Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.253] 
Characterization of Surface Runoff, Soil Erosion and Nutrient Loss on Forest-Agriculture Landscape Hidayat, Yayat; Murtilaksono, Kukuh; Sinukaban, Naik
JOURNAL OF TROPICAL SOILS Vol. 17 No. 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.259-266

Abstract

The study was aimed to quantify volume of surface runoff, soil erosion and nutrient loss from the forest-agriculture landscape (forest margins) in Lore Lindu National Park Central Sulawesi.  Surface runoff volume and soil erosion were measured daily on erosion plots. It was installed on  several land use types i.e. forest land,  maize,  young cocoa, medium cocoa, old cocoa, vanilla, shrub and bush and bareland, on the soil Typic Dystrudepts with slope ± 40%. The nutrient content in surface runoff and sediments were analyzed from selected surface runoff and sediment samples.  Surface runoff and soil erosion from agriculture land were respectively 2.1 to 3.4 and  3.6 to 5.8 times higher than from forest lands. Meanwhile, surface runoff and soil erosion from bareland were respectively 7.0 and 23.7 times greater than forest land respectively.  Sediment nutrient contents from forest land were  higher than agriculture land.  In the contrary, total nutrient lost from agriculture land were higher than forest land ones.  Nutrient losses carried by surface runoff were larger than those losses carried by sediments.  Dissolved organic carbon (DOC) loss in surface runoff was 6,1 to 8,0 times higher than total organic carbon (TOC) loss in sediments.  Likewise, nitrate (NO3-) loss in surface runoff was 1.9 to 12.1 times higher than total nitrogen (TN) in sediments as well as potassium, calcium, magnesium and sodium losses.  Potassium is dominant cation loss carried by the surface runoff, while calcium is mainly carried by sediment.Keywords:  Dissolve organic carbon; forest-agriculture landscape; nutrient loss; soil erosion; surface runoff[How to Cite: Hidayat Y, K Murtilaksono and N Sinukaban. 2012. Characterization of Surface Runoff, Soil Erosion and Nutrient Loss on Forest-agriculture Landscape. J Trop Soils, 17 (3): 259-266. doi: 10.5400/jts.2012.17.3.259][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.259]

Page 1 of 2 | Total Record : 12

 1   2 

Filter by Year

2012 2012


Reset
Filter By Issues
All Issue Vol. 30 No. 3: September 2025 (in Progress) Vol 30, No 3: September 2025 (in Progress) Vol 30, No 2: May 2025 Vol. 30 No. 2: May 2025 Vol 30, No 1: January 2025 Vol. 30 No. 1: January 2025 Vol. 29 No. 3: September 2024 Vol 29, No 3: September 2024 Vol 29, No 2: May 2024 Vol. 29 No. 2: May 2024 Vol 29, No 1: January 2024 Vol. 29 No. 1: January 2024 Vol 28, No 3: September 2023 Vol. 28 No. 3: September 2023 Vol. 28 No. 2: May 2023 Vol 28, No 2: May 2023 Vol. 28 No. 1: January 2023 Vol 28, No 1: January 2023 Vol 27, No 3: September 2022 Vol. 27 No. 3: September 2022 Vol. 27 No. 2: May 2022 Vol 27, No 2: May 2022 Vol 27, No 1: January 2022 Vol. 27 No. 1: January 2022 Vol 26, No 3: September 2021 Vol. 26 No. 3: September 2021 Vol. 26 No. 2: May 2021 Vol 26, No 2: May 2021 Vol 26, No 1: January 2021 Vol. 26 No. 1: January 2021 Vol 25, No 3: September 2020 Vol. 25 No. 3: September 2020 Vol. 25 No. 2: May 2020 Vol 25, No 2: May 2020 Vol. 25 No. 1: January 2020 Vol 25, No 1: January 2020 Vol. 24 No. 3: September 2019 Vol 24, No 3: September 2019 Vol 24, No 2: May 2019 Vol. 24 No. 2: May 2019 Vol 24, No 1: January 2019 Vol. 24 No. 1: January 2019 Vol. 23 No. 3: September 2018 Vol 23, No 3: September 2018 Vol. 23 No. 2: May 2018 Vol 23, No 2: May 2018 Vol. 23 No. 1: January 2018 Vol 23, No 1: January 2018 Vol. 22 No. 3: September 2017 Vol 22, No 3: September 2017 Vol 22, No 2: May 2017 Vol. 22 No. 2: May 2017 Vol 22, No 1: January 2017 Vol. 22 No. 1: January 2017 Vol. 21 No. 3: September 2016 Vol 21, No 3: September 2016 Vol. 21 No. 2: May 2016 Vol 21, No 2: May 2016 Vol. 21 No. 1: January 2016 Vol 21, No 1: January 2016 Vol 20, No 3: September 2015 Vol. 20 No. 3: September 2015 Vol 20, No 2: May 2015 Vol. 20 No. 2: May 2015 Vol. 20 No. 1: January 2015 Vol 20, No 1: January 2015 Vol. 19 No. 3: September 2014 Vol 19, No 3: September 2014 Vol. 19 No. 2: May 2014 Vol 19, No 2: May 2014 Vol. 19 No. 1: January 2014 Vol 19, No 1: January 2014 Vol. 18 No. 3: September 2013 Vol 18, No 3: September 2013 Vol. 18 No. 2: May 2013 Vol 18, No 2: May 2013 Vol 18, No 1: January 2013 Vol. 18 No. 1: January 2013 Vol 17, No 3: September 2012 Vol. 17 No. 3: September 2012 Vol. 17 No. 2: May 2012 Vol 17, No 2: May 2012 Vol 17, No 1: Januari 2012 Vol. 17 No. 1: Januari 2012 Vol 16, No 3: September 2011 Vol. 16 No. 3: September 2011 Vol. 16 No. 2: May 2011 Vol 16, No 2: May 2011 Vol. 16 No. 1: January 2011 Vol 16, No 1: January 2011 Vol 15, No 3: September 2010 Vol. 15 No. 3: September 2010 Vol 15, No 2: May 2010 Vol. 15 No. 2: May 2010 Vol 15, No 1: January 2010 Vol. 15 No. 1: January 2010 Vol. 14 No. 3: September 2009 Vol 14, No 3: September 2009 Vol 14, No 2: May 2009 Vol. 14 No. 2: May 2009 Vol. 14 No. 1: January 2009 Vol 14, No 1: January 2009 Vol 13, No 3: September 2008 Vol. 13 No. 3: September 2008 Vol 13, No 2: May 2008 Vol. 13 No. 2: May 2008 Vol. 13 No. 1: January 2008 Vol 13, No 1: January 2008 More Issue