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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 817 Documents
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Inhibiting Factors of Land Suitability for Piper nigrum L. in a Hilly Area of Tirtomoyo District, Central Java Mujiyo, Mujiyo; Sutarno, Sutarno; Suwarto, Suwarto; Budiono, R; sutopo, novi rahmawati
JOURNAL OF TROPICAL SOILS Vol. 25 No. 1: January 2020
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2020.v25i1.29-37

Abstract

Pepper (Piper nigrum L.) has a high selling value. The price of pepper in the domestic or international market that is always high can be a great opportunity to increase farmers’ income. Tirtomoyo District is dominated by hilly areas with common soil types of Litosol and Latosol. As one of the efforts to develop the regional economic rate, especially in hilly areas, pepper cultivation can be a solution offered by the agricultural sector. The study was conducted using an explorative descriptive survey method consisting of field observation and laboratory analysis. The analytical unit used was Land Map Unit (LMU) obtained from soil map. The sampling sites were selected using purposive sampling method according to the research objectives and representing the study area. The results show that the actual land suitability for pepper in Tirtomoyo District is marginally suitable (S3) for all LMU. The main limiting factors are water availability and nutrient availability, thus the Tirtomoyo district still have potency for pepper cultivation by applying some improvement measures such as fertilization, irrigation, organic material addition, and cover crop planting.
The Growth of Oil Palm Seedlings using a Combination Medium of Organic Oil Palm Empty Fruit Bunch and NPK Fertilizer at Main Nursery Hapsoh, Hapsoh; Dini, Isna Rahma; Wawan, Wawan; Sianipar, Astri Helga
JOURNAL OF TROPICAL SOILS Vol. 25 No. 2: May 2020
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2020.v25i2.61-69

Abstract

Oil palm (Elaeis guineensis Jacq.) holds a very strategic role in the Indonesia economy. Plants that have reached the economical age of 25 years need to be replanted using qualified oil palm seedling. The qualified seedling is obtained through proper fertilization. The combination of NPK fertilizer and organic material of oil palm empty fruit bunches (OPEFB) which has been given a cellulolytic bacterial consortium can provide sufficient nutrients for the growth of oil palm seedlings. The study aimed to determine the effect of giving a combination of OPEFB organic material, cellulolytic bacterial consortium, and NPK fertilizer on the growth of oil palm seedling (Elaeis guineensis Jacq.) at main nursery. This experiment used a single factor experiment arranged in a Completely Randomized Design (CRD). The treatments were a 100% NPK, a OPEFB compost, a 50% NPK + OPEFB compost, a 50% NPK + OPEFB + Cellulolytic bacterial consortium, and a OPEFB + cellulolytic bacterial consortium. The results showed that the application of inorganic fertilizers combined with organic fertilizers (a OPEFB compost and a OPEFB + cellulolytic bacterial consortium) had a good effect on each parameter. Giving organic fertilizer without inorganic fertilizer had not affected plant growth on all parameters. Application of a OPEFB compost and a OPEFB + cellulolytic bacterial consortium can reduce the use of inorganic fertilizers by 50%.
A Site-Specific Fertilizer Recommendation Based on the Phosphorus and Potassium Status in Mempawah District, West Kalimantan Hatta, Muhammad
JOURNAL OF TROPICAL SOILS Vol. 25 No. 2: May 2020
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2020.v25i2.93-106

Abstract

The recommendations of Phosphorus (P) and Potassium (K) fertilization for rice are still not site-specific yet due to a lack of required soil data information.  The P and K status of the paddy fields that provide information on the low, medium, and high P and K nutrient status are very useful for determining recommended the site-specific fertilizer in the the district area. The purpose of the research was to determine the site-specific fertilizer recommendation for paddy field based on their P and K status. This research was based on the field survey and the soil analysis in the laboratory. The soil samples were taken using a grid system, and the P and K levels were assessed by using a 25% HCl extraction. Soil samples were taken in a composite manner on all paddy fields in which their status have been identified. The composite soil samples were determined from 10 - 15 individual samples (sub-samples) with a sampling distance of each sub-sample of 25-50 m in the field.  The soil samples were taken in the overlay with a depth of 0-20 cm. Taking sub-samples were done by a diagonal or a zigzag method according to the conditions of paddy fields. The results of the study presented that the nutrient status of P and K and the fertilizer recommendations in paddy fields for rice plants located in 9 sub-districts in Mempawah Dsitrict had shown that nutrient status of P, on average, were from moderate to high levels, meanwhile, the nutrient status of K was from low to high levels. Recommendations for fertilizing rice fields in several sub-districts in Mempawah Regency are mostly 150 kg NPK (15:15:15) ha-1, 200 kg Urea ha-1 and 25 kg KCl ha-1.
The Reactions of Common Chemical Fertilizers in An Ultisol and Their Effects on Cowpea Performance Bunmi, Oyeyiola Yetunde; Ajayi, Omueti John
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.25-32

Abstract

Chemical fertilizers (CF) are the major input on arable farms in Nigeria. Current increasing rate of nutrient depletion in CF treated soils calls for the need to study their reactions in soils. To achieve this, three CF based treatments, namely NPK 15:15:15 applied at 40 kg P2O5 ha-1, Urea applied at 20 kg N ha-1  mixed with Single superphosphate at 40 kg P2O5 ha-1, and single superphosphate at 40 kg P2O5 ha-1  mixed with Gliricidia sepium leaves at 20 kg N ha-1  were studied. Sole lime (CaCO3) at 1 Mg ha-1 and a plot that received no amendment were compared. Cowpea was grown for two consecutive cropping seasons in 2012 and 2013 on the treated fields. The results indicated that CF reduced soil pH from initial 4.8 to 4.0. The NPK 15:15:15 fertilizer was the most severe of the CF tested, removing up to 133% alkalinity from the soil relative to lime. The NPK 15:15:15 reduced calcium saturation (from 25% to 21%) and magnesium saturation (from 12% to 8.3%) and increased acidity saturation (from 53% to 66%) with significant reductions in organic carbon content (from 13.2 g kg-1 to 11.0 g kg-1). Precaution including co-application of CF with organic materials such as Gliricidia sepium leaves can benefit for the soils.
Soil Microbial Activity and Diversity in Response to Soil Chemical Factors in Agricultural Soils Ishak, Lily; Brown, Philip Hugh
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.43-51

Abstract

The role of microbial communities in maintaining soil health is mostly influenced by chemical condition of soil. Microbial communities vary in response to soil chemical factors. The contradictive results from previous findings emphasise that it is difficult to define a pattern of the influence of soil chemical factors on soil microbial diversity and activity. The aim of the study was to assess soil microbial responses to soil chemical factors in agricultural soils. Composite soil (Dermosol order) samples taken from 16 commercial crop sites in Bundaberg, Queensland, Australia, were chemically and biologically analysed. It was found that bacterial and fungal activity and diversity were significantly affected by soil EC, SOM and NO3-N content, but were not influenced by soil pH, CEC, and Ca:Mg ratio. The diversity of bacterial and fungal communities displayed a positive linear relationship with soil EC, whereas the activity and diversity of these two microbial groups and SOM displayed a significant quadratic relationship. The finding suggested that microbial community was predominantly influenced by SOM content.
Soil Fertility Properties and Rice Biomass Production Under Three Rice Farming Systems at Vertisols Sambung Macan Sub District, Sragen Regency Sukristiyonubowo, .; Riyanto, Damasus; Widodo, Sugeng
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.17-23

Abstract

The farmers realize that green revolution technology with high inputs is no longer sustainable. They want to move to other rice farming systems. The aim of research was to study soil chemical-physical characteristics and rice productions under  three  rice farming systems. This study was conducted in Vertisols at Sambung Macan Sub District, Sragen Regency, arranged in a randomized complete block design with three replications and as the treatments was an organic, semi organic and conventional rice systems. One kilo gram composites soil  samples of 0-20 cm in depth were collected from five random sampling points of every site and taken in March 2017, before soil preparation. Rice biomass productions namely rice grains, rice straw and rice residues were harvested in the end of June 2017. The results indicated that in organic field, the soil chemical-physical fertility was superior to that of in semi organic and conventional and semi organic system was better than conventional in terms of soil pH, organic C and total N, P and K total, soil bulk density, particle density, soil porosity and permeability. Similar finding was observed for rice biomass productions. The rice grains yields were 7.53 ± 0.85, 6.60 ± 0.15 and 5.77 ± 0.71, rice straw were 7.97 ± 0.47, 7.63 ± 0.21 and 6.93 ± 0.25 and forrice residues were 4.20 ± 0.10, 3.30 ± 0.20 and 3.25 ± 0.35 Mgs ha-1 season-1 in organic, semi organic and conventional systems, respectively.Compared to the conventional system, the organic increased about 31 %, 15% and 29 % for rice grains, rice straw and rice residues, respectively. Comparing semi organic to conventional, the improvement was 14 %, 10 % and 2 % for rice grains, rice straw and rice residues, respectively. This short term research concluded that organic rice farming was superior to both semi organic and conventional systems, but the long term effect of organic need to be further evaluated.
Biochar Based Soil Amendment Formulation for Improvement Upland Acidic Soil in East Lampung: Soil Properties and Maize (Zea Mays) Yield Nurida, Neneng Laela; Jubaedah, .
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.33-41

Abstract

Many of soil amendment formulations (as a biochar based) have been tested in Indonesian Soil Research Institute greenhouse experiment to improve its effectiveness in the soil, though field experiments were still needed to measure more about its effectiveness. The objectives of this research are to study biochar-based soil amendment formulation on different ways of application in improving soil properties and crop yield in upland acidic soil. The research was conducted in Taman Bogo Research Station, East Lampung during three planting seasons. It started at January 2013 and finished at January 2014. The study was arranged in a split plot design with 3 replications. The main plot was 3 types of soil amendment formula namely SP50, SP75 and KS50. The subplot was the biochar-based soil amendment application way (7.5 Mg ha-1 per planting seasons), which gradually applied to soil namely three times of 3 planting seasons (2.5-2.5- 2.5 Mg ha-1), two times of 3 planting seasons (5.0-2.5-0 Mg ha-1), and a single time in 3 planting seasons (7.5-0-0 Mg ha-1). The plant indicator was maize (Zea mays), Bisma variety.  The variables observed were soil physical and chemical properties, and also maize yield. The results showed that during three planting seasons, the three types of soil amendment formulas had no effect on soil physical properties (Bulk density/BD and plant available water pores/AWP) and soil chemical properties (soil pH, organic C, K2+, Ca2+ and Al3+), and maize yield.  Biochar gradual application in two times (5.0-2.0-0 Mg ha-1) and a single time (7.5-0-0 Mg ha-1) had more effects and consistently improve AWP, soil chemical properties, and dry grain during 3 planting seasons compared to the application of 3 times in 3 planting seasons (2.5-2.5- 2.5 Mg ha-1). The dried grain yield was 3.11-5.23 Mg ha-1 per season or it was increased 291% in average during three planting seasons. Biochar application at a single time (at the beginning of the season at the rate of 7.5-0-0 Mg ha-1) provided positive residual effects on both soil and crop in upland acidic soil of East Lampung.
Characterization of Micronutrients and Heavy Metal Content in Organic Fertilizer Made From Fly Ash and Organic Waste Utami, Sari Widya; Tarigan, Roy Aries Permana; Widianingsih, Betti
JOURNAL OF TROPICAL SOILS Vol. 24 No. 1: January 2019
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2019.v24i1.11-16

Abstract

The production of electrical energy from burning of coal produced  large amounts of fly ash waste. Fly ash had the potential to be used as soil ameliorant material because it has a very fine size. The purpose of the research was to to develop a new alternative organic fertilizer and to find out the contents of micronutrients and heavy metal on organic fertilizer with fly ash matterials. The research was conducted by composting some organic matterials that consisted of fly ash, poultry manure, peanute litter, dusk of ripsaw and "Ares" of banana stalk in some comparisons. The selection of the the best organic fertilizer based on the ranking method. The result of this research showed that the selected organic fertilizer was fertilizer that given 10% of fly ash. The  micronutrientss content of the organic fertilizer was low for Cu, Mn and Zn element but the Fe element was high. The heavy metals content of the fertilizer was low for As, Cd, Hg and Pb.
Screening ofCultivable Indigenous Fungi which Responsible for Decomposing ofRice Straw Soni, Isnaini; Niswati, Ainin; Maryati, .
JOURNAL OF TROPICAL SOILS Vol. 17 No. 1: Januari 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i1.61-66

Abstract

The experiment was conducted to screen potentials indigenous fungi for rapid decomposing of rice straw. Seven isolates ofdominant fungi were isolated from the burying rice straw on the 2.5 cm soil depth after 30 days incubation on the paddy fields. Five dominant isolates were tested for their potential to decompose rice straw by assessing their value  decreasing C/N ratio and dry weight ofrice straw. Fungal inoculums treatments were arranged in a Completely Randomized Design with four replications. The results showed that the dominant cultivable fungi thatisolated from decomposed rice straw were Trichoderma sp., Fusarium sp., Mucor sp., Aspergillus sp., and Penicillium sp. Among the tested fungi, Trichoderma sp. had the biggest ability to decompose rice straw compared to others indigenous fungi. The C/N ratio was reduced to 39.47 from an initial value of73.33 ofcontrol treatment in 10 days ofbiodegradation process in laboratory scale, thus showing the potential of indigenous Trichoderma sp. for use in large-scale composting ofrice straw.
Palm Oil Mill Efluent - Zeolite Mixture Improves Acid and Base Cations in Acid Sulfate Soil Santi, Ida Nur
JOURNAL OF TROPICAL SOILS Vol. 25 No. 1: January 2020
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2020.v25i1.21-27

Abstract

Acid sulfate soil contains high acid cations. Palm oil mill effluent (POME) mixed with zeolite can increase pH of acid sulfate soil. Base cations (Ca, K and Mg) on zeolite are exchangeable with H+  and Al3+ ions in acid sulfate soil. The aim of this study was to investigate the effects of application of POME-zeolite mixture on acid cations of acid sulfate soil. The study was arranged in a Completely Randomized Design, with 9 treatments of POME applied on 10 kg of acid sulfate soil. Acid sulfate soil was put into 45cm x 40cm polybag. POME plus zeolite powder (60 mesh, type clinoptilolite) was applied on soil by watering evenly and incubated for 4 weeks at room temperature. The results showed that the content of acid cations of exchangeable-Al and exchangeable-H decreased by 71.21% and 27.71%, respectively after application of POME -zeolite. The application of POME without zeolite decreased the content of exchangeable-Al and exchangeable-H by 46.54% and 42.75%, respectively. Aluminium saturation has decreased after POME-zeolite application from 42.68% (high) to 8.52% (very low). Base saturation increased after application of POME-zeolite application from 17.64% (very low) to 34.88% (low). Application of palm oil mill effluent-zeolite mixture decreased acid cations in acid sulfate soil. Base saturation correlates positively to pH and cation exchange capacity and negatively correlates to Al saturation. The main factors controlling the increase of pH, base saturation and cation exchange capacity of acid sulfate soil after POME-zeolite application were the decrease of exchangeable-H, followed by exchangeable-Al and total-Fe.

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