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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 812 Documents
 5   6   7   8   9 
Carbon Stock in Integrated Field Laboratory Faculty of Agriculture University of Lampung Irwan Sukri Banuwa; Tika Mutiasari; Henrie Buchori; Muhajir Utomo
JOURNAL OF TROPICAL SOILS Vol 21, No 2: May 2016
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2016.v21i2.91-97

Abstract

This study aimed to determine the amount of carbon stock and CO2 plant uptake in the Integrated Field Laboratory (IFL) Faculty of Agriculture University of Lampung. The research was conducted from April to November 2015. The study was arranged in a completely randomized block design (CRBD), consisting of five land units as treatment with four replications for each treatment. Biomass of woody plants was estimated using allometric equation, biomass of understorey plants was estimated using plant dry weight equation, and organic C content in plants and soils were analyzed using a Walkey and Black method. The results showed that land unit consisting of densely woody plants significantly affects total biomass of woody plants, organic C content in woody plants and total carbon content (above and below ground). The highest amount of woody plant biomass was observed in land unit 5, i.e. 1,196.88 Mg ha-1, and above ground total carbon was 437.19 Mg ha-1. IFL Faculty of Agriculture University of Lampung has a total carbon stock of 2,051.90 Mg and capacity to take up total CO2 of 6,656.88 Mg.
Effect of Bio-phosphate on Increasing the Phosphorus Availability, the Growth and the Yield of Lowland Rice in Ultisol Yafizham Yafizham; Muslim Abubakar
JOURNAL OF TROPICAL SOILS Vol 15, No 2: May 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i2.133-138

Abstract

Effects of Bio-phosphate on Increasing the Phosphorus Availability, the Growth and the Yield of Lowland Rice in Ultisol (Yafizham and M Abubakar): Ultisol soil is low of macro and micro nutrient, pH and base saturation as well as high toxicity of Al and Fe. To increase productivity of ultisols soils, especially availability of P nutrients, the use  of bio-phosphate can increase P solubilizing in the soils. The research was conducted in the green house of Agriculture Faculty, the University of Lampung from January to March 2005.  A factorial experiment using two factors  in a randomized completely block design with five replications was conducted.  The first factor was dosages of bio-phosphate (0; 10; 20 g L-1), the second factor was lowland rice cultivar (Ciherang, Sintanur, Cilosari and IR64).  The results showed that the availability of N, K and P nutrients in the soil before planting was low. Application of bio-phosphate increased availability of N, K and P in the soil. Application of 10 g L-1 and 20 g L-1 of bio-phosphate increased root length of lowland rice, there were 13.3% and 36.8%, respectively. Application of 20 g L-1 of bio-phosphate increased 100 grain weight of lowland rice which were higher 11.4% compared to without any bio-phosphate.
Relationship between Distance Sampling and Carbon Dioxide Emission under Oil Palm Plantation Ai Dariah; Fahmuddin Agus; Erni Susanti; . Jubaedah
JOURNAL OF TROPICAL SOILS Vol 18, No 2: May 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i2.125-130

Abstract

Carbon dioxide emission on peatland under oil palm plantation were highly varied probably due to many factors involved.  The objectives of the research were to evaluate the effect of distance sampling from center of oil palm tree on Carbon dioxide flux, and  to study the factors that cause variability of carbon dioxide flux on peatland under oil palm plantation.  The study was conducted on peatland at Arang-Arang Village, Kumpek Ulu Sub-District, Muaro Jambi District, Jambi Province, on six year old oil palm plantation.  The study was conducted in the form of observational exploratory.  Emission measurements performed on 5 selected oil palm trees at points within 100, 150, 200, 250, 300, 350, and 400 cm from the center of trunk.  Carbon dioxide flux was measured using (IRGA), Li-COR 820.  The results showed that there is significant correlation between the distance of sampling from center of oil palm tree and Carbon dioxide flux.  The farther distance from the tree, Carbon dioxide flux more decreased. Before applying fertilizer, variability of soil fertility was not significantly correlated with the flux of Carbon dioxide, so the difference of Carbon dioxide flux based on distance sampling can be caused by root distribution factor.  After fertilizer application, variability of Carbon dioxide flux under the oil palm tree were beside affected by differences in root distribution, was also greatly influenced by fertilization.Keywords: Carbon dioxide flux, distance sampling, oil palm, peat, root-related respiration [How to Cite: Dariah A, F Agus, E Susanti and Jubaedah. 2013.Relationship between Sampling Distance and Carbon Dioxide Emission under Oil Palm Plantation. J Trop Soils 18 (2): 125-130. Doi: 10.5400/jts.2013.18.2.125][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.2.125] REFERENCESAgus F, E Handayani, van M Noordwijk, K Idris and S Sabiham.  2010 Root respiration interferes with peat CO2 emission measurement. 19th World Congress of Soil Science, Soil Solutions for a Changing World. 1 - 6 August 2010, Brisbane, Australia. Published on DVD.Amador JA and RD Jones.  1993.  Nutrient limitation on microbial respiration in peat soil with diffrent total phosphorus content.  Soil Biol Biochem  25: 793-801.Franklin O, P Hoogberg, A Ekbled and GI Agren.  2003.  Pine forest floor carbon accumulation in response to N and PK addition: Bomb C-14 modeling and respiration studies.  Ecosystem 6: 644-658.  Freeman C, N Ostle and H Kang.  2001.  An Enzymic ‘latch’ on global carbon store-a shortage of oxigen locks up carbon in peatlands by restraining a single enzyme.  Nature 409: 149-149.Hanson PJ, NT Edwards, CT Garten and JA Andrew.  2000.  Separating root and soil microbial contributions to soil respiration: A review of methods and observations.  Biogeochemistry 48: 115-146.Henson IE, and SH Chai.  1997.  Analysis of oil palm productivity.  II. Biomass, distribution, productivity and turnover of the root system.  Elaeis 9: 78-92.Hergoualc’h K and LV Verchot. 2011.  Stocks and fluxes of carbon associated with land use change in Southeast Asian tropical peatlands: A review. Glob Biogeochem Cycl 25. doi:10.1029/2009GB003718.Howarth RW and SG Fisher.  1976.  Carbon, nitrogen, phosporus dynamic during leaf decay in nutrient-enriched stream microecosystems.  Freshwater Biol 6: 221-228.Husen E and F Agus.  2011.  Microbial activities as affected by peat dryness ans ameliorant.  Am J Environ Sci 7: 348-353.Jauhiainen J, A Hooijer and SE Page.  2012.  Carbon dioxide emissions from an Acacia plantation on peatland in Sumatra, Indonesia. Biogeosciences 9: 617–630. DOI:10.5194/bg-9-617-2012.Khalid H, ZZ Zin and JM Anderson.  1999.  Quantification of oil palm biomass and nutrient value in mature planttation.  II Below-ground biomass.  J Oil Palm Res 11: 63-71.Knorr KH, MR Oosterwoud and C Blodau. 2008. Experimental drought alters rates of soil respiration and methanogenesis but not carbon exchange in soil of a temperate fen. Soil Biol Biochem 40: 1781-1791.Law BE, FM Kelliher, DD Baldocchi, PM Anthoni, J. Irvine, D. Moore and SV Tuyl.  2001.  Spatial and temporal variation in respiration in  a young ponderosa pine forest during a summer drought.  Agric Forest Meteorol 110: 27-43.Laiho R, J Laine, CC Trettin and L Finner.  2004.  Scot pine litter decomposition along drainage succession and soil nutrient gradient in peat land forest, and the effect of inter-annual weather variation.  Soil Biol Biochem 36: 1095-1109.Madsen R, L Xu, B Claassen and D McDermit.  2009.  Surface monitoring method for carbon capture and storage projects. Energy Procedia 1: 2161-2168Martoyo K.  1992.  Kajian Sifat Fisik Tanah Podsolik untuk Tanaman Kelapa Sawit (Elaeis gueneensis Jacq) di Sumatera Utara.  Tesis Program Pasca Sarjana,  Universitas Gajah Mada.  Yogyakarta (in Indonesian).Melling L, R Hatano and KJ Goh. 2007. Nitrous oxide emissions from three ecosystem in tropical peatlands of Sarawak, Malaysia. Soil Sci Plant Nutr 53: 792-805.Minkkinen K, J Laine, NJ Shurpali, P Makiranta, J Alm and T Pentilla.  2007.  Heterotropic soil respiration in forestry-drained peatland.  Boreal Environ Res  12: 115-126. Murdiyarso D, K Hergoualc’h K and LV Verchot. 2010 Opportunities for reducing greenhouse gas emissions in tropical peatlands. PNAS 107:  19655-19660.Olsen R, S Linden, R Giesler, and P Hogberg.  2005.  Fertilization of boreal forest reduce of both autrotrophic dan heterotrophic soil respiration .  Glob  Change  Biol  11: 1745-1753.Silvola J, J Valijoki and H Aaltonen.  1985.  Effect of draining and fertilization on soil respiration at three ameliorated peatland site.  Acta For Fem 191: 1-32.Silvola J, J Alm, U Aklholm, H Nykanen and PJ Martikainen.  1996a. Carbon dioxide fluxes from peat in boreal mires under varying temperature and moisture condition.  J Ecol 84: 219-228.Silvola J, J Alm, U. Ahlholm, H Nykanen, and PJ Martikainen.  1996b.  The contribution of plant roots to carbon dioxide fluxes from organic soils.  Biol  Fertil Soils 23: 126-131.Wang W, K Ohseb and J Liuc. 2005.  Contribution of root respiration to soil respiration in a C3/C4 mixed grassland. J Bioscience 30: 507-514. 
The Role of Inundation Types of Tidal Swampland on the Chemical Properties of Potentially Acid Sulphate Soils under Fertilizer and Lime Application Arifin Fahmi; Muhammad Alwi; Dedi Nursyamsi
JOURNAL OF TROPICAL SOILS Vol 23, No 2: May 2018
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2018.v23i2.55-64

Abstract

Generally, fertilizer application increases soil fertility, on the other hand fertilizer application leads to the alteration of soil chemical balances in which the magnitude of changes is determined by soil properties. The research aimed to study the soil chemical properties of potentially acid sulphate soils (PASS) originally from two types of tidal swampland as influenced by the application fertilizers and lime. A pot experiment was carried out in a glasshouse. Soil samples were taken from PASS originated from two types of tidal swampland, i.e. PASS in type B tidal swampland (PASS-B) and PASS in type C tidal swampland (PASS-C). The experiment was arranged in single factor of completely randomized design, consisting of six levels of urea, SP-36, and KCl fertilizers and lime that were determined based on Decision Support System software (DSS). Soil pH, total nitrogen (N), available phosphorus (P), exchangeable potassium (K) and iron (Fe) were measured periodically every four weeks, soil redox potential (Eh) was measured every week, leaf color index was measured every two weeks. The dynamics of soil pH, concentration of P, K, Fe and N of PASS were influenced by the application of fertilizer rates and lime, although, the magnitude of their changes were influenced by inundation type of tidal swampland. These facts were mainly associated with the presence of Fe mineral in both soils, the different concentration of Fe2+ in PASS-B and PASS-C may be related to land hydrological condition of type B tidal swampland that is frequently flooded as origin of PASS-B.
Leaching Behaviour of Nitrogen in Forage Rice Cultivation that Applied with Animal Manure . Gusmini; Kazuyuki Nishimura; . Adrinal; Tomio Itani
JOURNAL OF TROPICAL SOILS Vol 18, No 3: September 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i3.209-216

Abstract

Increased use of N fertilizer may substantially increase of nitrate nitrogen (NO3-N) leaching, which potentially pollutes groundwater.  Leaching behaviour of nitrogen (N) was observed in the paddy field of forage rice cultivation. Two kinds of animal manure, cattle manure (CM) and poultry manure (PM) at 5 levels of N application (0, 70, 140, 210, 280 kg N ha-1) as the organic N sources, and without any chemical fertilizers. “Tachisuzuka” forage rice variety was conducted in the experimental plot. Porous ceramic cups were installed in triplicate of each treatment at 45 cm depth to collect the percolation water samples during the cultivation rice periods. The concentration of total N, NH4-N, NO2-N and NO3-N of water (surface and percolation) and soil sample solution were analysed using a Hach DR/2800 spectrophotometer. Result showed that NO3-N leaching was higher than NH4-N in the percolation water during the cultivation of forage rice periods. The highest NO3-N leaching was found in 280 kg N ha-1 (6.3 mg L-1), that it was indicated on the polluted levels. The highest of biomass production was in N280 (16.22 t ha-1) and nearly similar result in N140, N210 and N280. It was concluded that the best application of N-fertilizer in 140 kg N ha-1 because it greatly enhanced N-fertilizer efficiency, and decreased steadily of NO3-N concentration leaching in the environment of the groundwater.Keywords: Ammonium (NH4-N), Forage rice, N behavior, Nitrate (NO3-N), N leaching[How to Cite: Gusmini, K Nishimura, Adrinal, and T Itani. 2013. Leaching Behaviour of Nitrogen in Forage Rice Cultivation that Applied with Animal Manure. JTrop Soils 18 (3): 209-216. Doi: 10.5400/jts.2013.18.3.209][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.3.209]REFERENCESAgrawal GD, SK Lunkad and T Malkhed. 1999. Difusse agricultural nitrate pollution of groundwater in India. Water Sci Technol 20: 67-75.Asada K, T Nishimura, C Kato, K Toyota and M Hosomi. 2013. Phyto-purification of livestock-derived organic waste by forage rice under subtropical climate. Paddy Water Environ 11: 559-571.Kamiji Y and T Sakuratani. 2011. Analysis of Optimum Spikelet Number and Plant N in Rice at Tanazawa Paddy Field. J Agric Sci 56: 93-102.Kato H. 2008. Development of rice varieties for whole crop silage (WCS) in Japan. JARQ 42: 231-236.Keeney DR. 1982. Nitrogen management for maximum efficiency and minimum pollution. In: Stevenson FJ (ed). Nitrogen in Agricultural Soils. Agron. Monogr. 22. ASA, CSSA, and SSSA, Madison. Wisc,  pp 605-649.Kumazawa K. 2002. Nitrogen fertilization and nitrate pollution in groundwater in Japan: Present status and measures for sustainable agriculture. Nutr Cyc Agroecocyst 63: 129-137.Kyaw KM, K Toyota, M Okazaki, T Motobayashi and H Tanaka. 2005. Nitrogen balance in a paddy field planted with whole crop rice (Oryza sative cv. Kusahonami) during two rice-growing seasons. Biol Fertil Soils 42: 72-82.Liu GD, WL Wu and S Zhang. 2005. Regional differentiation of non-point source pollution of agriculture-derived nitrate nitrogen in groundwater in northern China. Agric Ecosys Environ. 107: 211-220.Matsushita K, S Iida, O Ideta, Y Sunohara, H Maeda, Y Tamura, S Kouno and M Takakuwa. 2011. “Tachisuzuka”, a new rice cultivar with high straw yield and high sugar content for whole-crop silage use. Breeding Sci 61: 86-92.Ministry of Agriculture, Forestry and Fisheries (MAFF). 2013. Recent situation and research of rice for whole crop silage in Japan. Accessed 18 August 2013.Ookawa T, K Yasuda, H Kato, M Sakai, M Seto, K Sunaga, Motobayashi, S Tojo and T Hirasawa. 2010. Biomass production and lodging resistance in ‘Leaf Star’, a new long-culm rice forage cultivar. Plant Prod Sci 13: 58-66.Okajima H and H Imai. 1973. Nutrient supplying power of soils. II. Contribution of mass flow to the nutrient supply in flooded rice fields. Jpn J Soil Sci Plant Nutr 44: 296-300. Sahu SK and PK Samant. 2006. Nitrogen loss from rice soil in Orissa. Orissa Review. India. Sakai M, S Iida, H Maeda, Y Sunohara, H Nemoto and T Imbe. 2003. New rice varieties for WCS use in Japan. Breed Sci 53: 271-275.Sakai M, M Okamoto, K Tamura, R Kaji, R Mizobuchi, H Hirabayashi, T Yagi, M Nishimura and S Fukaura. 2008. “Tachiaoba”, high yielding rice variety for whole crop silage. Breed Sci 58: 83-88.Suprapti H, M Mawardi and D Shiddieq. 2010. Nitrogen transport and distribution on paddy rice soil under water efficient irrigation method. Paper Presented on International Seminar of ICID, Yogyakarta. Indonesia. Toriyama K and H Ishida. 1987. Method of estimating time of NH4-N disappearance in paddy field by soil solution analysis. Jpn J Soil Sci Plant Nutr 58: 747-749.Wang MY, MY Siddiqi, TY Ruth and ADM Glass. 1993. Ammonium uptake by rice roots. II. Kinetic of 13NH4+ influx across the plasmalemma. Plant Physiol 103: 1259-1267.Wang JY, SJ Wang and Y Chen. 1995. Leaching loss of nitrogen in double-rice-cropped paddy fields in China. Acta Agricul Zhejiangensis 7: 155-160.Zhu JG, Y Han, G Liu, YL Zhang and XH Shao. 2000. Nitrogen in percolation water in paddy fields with a rice/wheat rotation. Nutr Cycl Agroecosyst 57: 75-82.Zhuo S and M Hosomi. 2008. Nitrogen transformations and balance in a constructed wetland for nutrient polluted river water treatment using forage rice in Japan. Ecol Eng 32: 147-155.Zhuo S, H Iino, S Riya, M Nishikawa, Y Watanabe and M Hosomi. 2011. Nitrogen transformations in paddy field applied with high load liquid cattle waste. J Chem Engin Jpn 44: 713-719.
Respon Tanaman Jagung terhadap Pemupukan Fosfor pada Typic Dystrudepts Antonius Kasno
JOURNAL OF TROPICAL SOILS Vol 14, No 2: May 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i2.111-118

Abstract

Response of Maize Plant to Phosphorus Fertilization on Typic Distrudepts (A. Kasno): On the acid soil, phosphorus nutrients  become critical for agricultural crops growth. At the present, price of fertilizers significantly increase and fertilizers are not available. These conditions can affect on soil productivity and crop production. The objective of these research were to study the  response of maize (Zea mays L.) to phosphate fertilizers on Inceptisol. The research was conducted in Cicadas Village on Typic Dystrudept. Experiment was conducted in a randomized completely block design, with 8 treatments and three replications. Treatments consisted of 6 dosages of P fertilizers, which were P source is SP-36 WIKA Agro 0, 10, 20, 40, 60 and 80 kg ha-1. SP-36 and Tunisia rock phosphate (40 kg P ha-1) were used for standard. Pioneer 12 variety of maized was used as an indicator. Plot size was 5 m x 6 m and the maize was planting with distance of 75 cm x 20 cm with   one seed per hole. The results showed  that organic C and N, P (extracted by Bray 1), K and CEC on the soil were low. Phosphate fertilizers significantly increased which was P extracted by HCl 25% from 24 to 67 mg P 100 g-1 soil and which were extracted by Bray 1 increased from 0,87 to  63.31 mg P kg-1 soil. Phosphate fertilizers significantly increased plant height from 175.2 cm become to 221.1 cm. Plant height of maize using SP-36 WIKA Agro fertilizer (210.6 cm) was similar to plant heigh using SP-36 fertilizer (213.4 cm)  but less height from Tunisia rock phosphate. The yield of maize on SP-36 WIKA Agro (4.94 t ha-1) were linely higher than SP-36 (4.69 t ha-1), significantly was higher than that of Tunisia rock phosphate. Maximum dosage of SP-36 fertilizer was 66.67 kg P ha-1, and optimum dosage was 42 kg P ha-1. Value of Relative Agronomic Effectiveness SP-36 WIKA Agro fertilizer was heigher than SP-36.
Penggunaan Metode Bioassay untuk Mendeteksi Pergerakan Herbisida Pascatumbuh Paraquat dan 2,4-D dalam Tanah Nanik Sriyani; Abdul Kadir Salam
JOURNAL OF TROPICAL SOILS Vol 13, No 3: September 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i3.199-208

Abstract

A simple and cheap method to detect herbicide residue in soil and water is urgently needed as the quantity and frequency of herbicide usage is steadily increasing in Indonesia which raises concern about the effects of herbicide residue in soil and water.  This study is the third step from a series of studies aim to develop bioassay technique to detect the present and quantity of herbicides in soil and water.  In this study, bioassay was used to detect movement of paraquat and 2,4-D herbicides in soil.  Study was carried out using soil column method.  Treatments were arranged factorially in a completely randomized block design with 3 replicates.  Two ultisol soil types: Podsolik Merah Kuning (PMK) and Latosol Coklat (LC) and 2 post emergence herbicides: paraquat and 2,4-D, were tested.  To calculate the amount of herbicide using bioassay, each standard curve for paraquat and 2,4-D were developed.  Using these standard curves, the amount of paraquat and 2,4-D was calculated based on the growth rate of caisim as indicator plant.  Results showed that bioassay method can be utilized to detect herbicide movement in soil.  The amount and the rate of herbicide movement were determined by soil and herbicide types.  In PMK, paraquat reached the depth of 20-30 cm at 2 weeks after application (WAA), however, after that the amount of paraquat found was very limited.  In LC, the movement of paraquat was more limited compared to its movement in PMK.  Paraquat reached soil depth of 10-20 cm at 2 WAA, afterward paraquat was only detected in soil depth of 0-10 cm.  Similar pattern was observed for 2,4-D which reached soil depth of 30-40 cm at 1 WAA in PMK.  In LC, 2,4-D movement was more limited.  At 2 WAA, 2,4-D in LC reached soil depth of 30-40 cm in limited amount and after 12 WAA the herbicide was detected only at soil depth of 0-10 cm.
Estimation of the Potential Carbon Emission from Acrotelmic and Catotelmic Peats Siti Nurzakiah; Supiandi Sabiham; Budi Nugroho; Dedi Nursyamsi
JOURNAL OF TROPICAL SOILS Vol 19, No 2: May 2014
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2014.v19i2.81-89

Abstract

Agricultural development on peatland in Indonesia has been constrained by the presence of environment issues in relation to the release of greenhouse gases (GHGs) particularly carbon dioxide (CO2) and methane (CH4) to the atmosphere. This study was aimed to predict the potential carbon emission based on carbon stocks in acrotelmic and catotelmic peats with the reference of groundwater level of peatland.  The results showed that groundwater levels have played an important  role  in  carbon  release, which  has  close  relationship  with  water  regime  of  the upper  layer  of  peats  that influenced by oxidative and reductive conditions of the land.  From the layer that having groundwater level fluctuations during the period from rainy to dry season (acrotelmic peat), the emissions were mostly dominated by CO2 release, while from permanent reductive-layer (catotelmic peat) was not detected.  The decrease of groundwater level from -49.6 to -109 cm has clearly influenced carbon emission.  From each decreasing 1.0 cm groundwater level, CO2 emission measured during the period of February - October 2013 was calculated to yield about 0.37 Mg ha-1 yr-1.Keywords: Acrotelmic and catotelmic peat, carbon emission, groundwater level [How to Cite: Siti N, S Sabiham, B Nugroho and Di Nursyamsi. 2014. Estimation of the Potential Carbon Emission from Acrotelmic and Catotelmic Peats. J Trop Soils 19(2): 91-99. Doi: 10.5400/jts.2014.19.2.91]    
Choosing Different Contour Interval on a Fully Raster-Based Erosion Modeling: Case Study at Merawu Watershed, Banjarnegara, Central Java Bambang Sulistyo
JOURNAL OF TROPICAL SOILS Vol 16, No 3: September 2011
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2011.v16i3.257-266

Abstract

The research was aimed to study the efect of choosing different contour interval to produce Digital Elevation Model on a fully raster-based erosion modeling of The Universal Soil Loss Equation using remote sensing data and a geographical information system technique.  Methods were applied by analyzing all factors that affecting erosion in GIS environment such data were in the form of raster. Those data were R , K, LS, C and P factors. LS factor was derived from Digital Elevation Model by taking flow direction from each pixel into consideration. Research used 3 contour intervals to produce Digital Elevation Model, i.e. 12.5, 25 and 50 meter. C factor was derived from the formula after applying linearly regression analysis between Normalized Difference Vegetation index of remote sensing data and C factor measured directly on the field. Another analysis was the creation of map of Bulk Density used to convert erosion unit as from Mg ha-1mo-1 to mm mo-1. To know the model accuracy,  validation of the model was done by applying statistical analysis and by comparing the result of erosion model (Emodel) with actual erosion (Eactual) which was measured regularly in Merawu watershed. A threshold value of > 0.80 or > 80% was chosen to justify whether the model was accurate or not. The results showed that all Emodel using 3 countour intervals have correlation value of > 0.8. These results were strenghtened with the result of analysis of variance which showing there were no difference between Emodel and Eactual. Among the 3 models, only Emodel using 50 meter countour interval reached the accuracy of 81.13% while the other only had 50.87% (using countour interval 25 meter) and 32.92% (using countour interval 12.5 meter).
Existing of Vesicular Arbuscular Mycorrhizal on The Corn Field Subjected by Long-term Organic and Inorganic Fertilizers Sri Yusnaini
JOURNAL OF TROPICAL SOILS Vol 14, No 3: September 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i3.253-260

Abstract

Existing of vesicular arbuscular mycorrhizal fungi were investigated in continuously cropped, conventional agro ecosystems which had received annual long-term (4 years) amendments of either manure or inorganic fertilizer. The systems had an identical 4–year crops rotation and differed essentially only in the amount and type of fertilizer supplied. Experiment was setup at Taman Bogo, in the vicinity of Probolinggo, East Lampung. The eight farming systems differed mainly in fertilization application. The organic systems were fertilized exclusively with chicken manure (CK), and green manure Glyricidium sp. (GM) 20 Mg ha-1. One conventional system was fertilized with the inorganic fertilizers (IF) (urea 300 kg ha-1, SP 36 200 kg ha-1, and KCl 100 kg ha-1).  Four proportion combination fertilized organic and inorganic fertilizers i.e combination of 50% CK + 50% IF, 50% GM + 50% IF, 75% CK + 25% IF, and 75% GM + 25% IF.  Application of chicken manure both exclusively or combination with inorganic fertilizer gave the higher AMF spore number and root colonization than others treatment. The dominant species of AMF at all treatment was Glomus constrictum.

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