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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
 48   49   50   51   52 
Site Specific Nitrogen Management Simulated by CropSyst Model under Different Inputs of Nitrogen Fertilizer Wijayanto, Yagus
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.229-235

Abstract

Site Specific Nitrogen Management Simulated by CropSyst Model under Different Inputs of Nitrogen Fertilizer (Y Wijayanto): Site Specific Nutrient Management (SSNM) has been suggested as the only means for increasing productivity of crops and minimizing the environmental impacts. Despite of this, it is also widely recognized that compared to uniform application, SSNM provides a significant challenges related to the level of management. This is due to the fact that SSNM relates to the management of field / site (or fields / sites) and considers also the spatial and temporal component of factors leading to crop production. A method is urgently required and the most appropriate one is crop model. This study was aimed at using  CropSyst to model yields due to the difference in N applications  and its implementation for SSNM. The study area was located at Jenggawah Village, Sub-District Jenggawah, Jember Regency. Thirty soil samples were taken and six farmer’s fields were chosen for the purpose of modeling. Interview was conducted to obtain the information about the management of farmer’s fields. Yields in each farmer’s fields were used as an integrated indicator. The results suggested that the predicted yields at farmer’s fields were in agreement with those in reality. Simulated yields  based on  different amount of N inputs showed yields were proportional with different N inputs. This study concluded that there do exist a significant amount of potential applications of CropSyst for Site Specific Nitrogen Management
The Properties of Humic Acids Extracted from Four Sources of Organic Matters and Their Ability to Bind Fe2+ at New Established Rice Field Herviyanti, .; Prasetyo, Teguh Budi; Ahmad, Fachri; Darmawan, .
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.237-244

Abstract

The Properties of Humic Acids Extracted from Four Sources of Organic Matters and Their Ability to Bind Fe2+ at New Established Rice Field (Herviyanti, TB Prasetyo, F Ahmad and Darmawan):  In order to identify the properties of humic acid extracted from four kinds of organic matters (a peat soil, a stable manure, a compost of rice straw and a municipal waste)  and their potentiality to bind Fe2+  at new established rice field, a series of experiment was done in Soil Laboratory Faculty of Agriculture, Andalas University Padang. First step was characterization of functional groups and other chemical properties of humic acids, and their reaction with Fe2+. The second step was to examine the ability of humic acids to bind Fe2+ solution at new established rice field by conducting incubation experiments.  The experiment used  a completely randomized design with three replications.  The 450 ppm Fe solution was treated with 0, 50, 100, 150, 200, 250, 300, 350, 400, and 450 ppm humic acids and incubated for 24 hours.  While top soil samples taken from Sitiung, West Sumatera were treated with 0,100, 200, 300, and 400 ppm humic acids, flooded with deionized water, and incubated for 6 weeks.  The result showed that   the functional group and other chemical characteristic of humic acid from rice straw compost and peat soil were better than those of manure and municipal waste compost. Functional group of both humic acids was dominated by COO-. High reactivity of the humic acid had been found when humic acids were added to Fe solution with ratio 1 : 1. Use of humic acid extracted from peat soil with the levels from 0 to 100, 200, 300, and 400 ppm decreased the Fe2+ concentration from 1.361 ppm to  910, 860, 831, and 776 ppm, respectively at new established rice field.  While the use of humic acid extracted from  rice straw compost with the same levels as above decreased the Fe2+ concentration  from 1361 to 770, 701, 612, and 600 ppm, respectively, after four weeks of flooding.
Soil Organic Carbon Losses: The Balance between Respiration and Leaching, and Phosphorus Mobility in Lateritic Soils Yusran, Fadly Hairannoor
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.245-254

Abstract

Soil Organic Carbon Losses: The Balance between Respiration and Leaching, and Phosphorus Mobility in Lateritic Soils (FH Noor): Organic matter (OM) application may contribute to managing lateritic soils by improving aspects of physical, chemical, and biological fertility.  However, the finite persistence of organic carbon (OC), the main component of soil organic matter (SOM), may limit the usefulness of OM addition because decomposition and C leaching promotes C loss from the soil, especially in tropical regions.  The main objectives of this study were to determine the balance and dynamics of soil OC (SOC) due to mineralisation and leaching processes and the relationship of these processes to P mobility in soil.  Two lateritic soils of Western Australia were used.  Both soils were packed into plastic columns and water was added to simulate two rainfall regimes: tropical (4,000 mm year 1) and subtropical (900 mm year 1).  Three types of OM (peat, wheat straw, and lucerne hay) were added at the equivalent of 80Mg ha 1.  Soils were watered weekly to supply one year’s rainfall over a period of six months.  Carbon loss from leaching contributed 1.4% of the total C, whilst respiration accounted for 10.4%.  The Ultisol with a sandy texture had more C loss in leachate than the Oxisol with higher clay content, for the simulated tropical rainfall.  The subtropical rainfall regime resulted in more respiration than the tropical rainfall regime.  Downward movement of dissolved organic carbon (DOC) changed the distribution of non-extractable phosphorus (NP) and bicarbonate phosphorus (BP) in the leaching column, as well as the dislocation of extractable Al and Fe.
The Effects of Various Water Table Depths on CO2 Emission at Oil Palm Plantation on West Aceh Peat Handayani, Etik Puji; Noordwijk, Meine Van; Idris, Kamarudin; Sabiham, Supiandi; Djuniwati, Sri
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.255-260

Abstract

The Effects of Various Water Table Depths on CO2 Emission at Oil Palm Plantation on West Aceh Peat (EP  Handayani, M van Noordwijk, K Idris,  S Sabiham and S Djuniwati):  Changes in the depth of water table influenced carbon cycling in peatlands, and affected the sources and sinks of carbon dioxide.  The effects of depth of water tables in oil palm plantations on the emission of CO2 were studied. CO2 emissions of peatland were measured in Meulaboh, West Aceh using cylindrical chambers and  air samples from the chambers were analyzed by gas chromatography. Five-point transects perpendicular to drainage canals provided variation in the depth of water tables for the samples. Data from oil palm fields were compared to data from an adjacent swamp forest. The data confirmed that  the increasing depth of water table was accompanied by the increasing in microbial activity that was measured by CO2 emission.  The CO2 emissions from chambers with additional root zones were higher than from bulk soil chambers between one to four times.
Model Simulation of “Sawah-Kolam” System for Rainwater Harvesting to Support Rainfed Paddy Production Triyono, Sugeng; Zeovany, .; Oktafri, .; Rosadi, Bustomi
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.261-270

Abstract

Model Simulation of “Sawah-Kolam” System for Rainwater Harvesting to Support Rainfed Paddy Production (S Triyono, Zeovany, Oktafri, and B Rosadi): The study was used to evaluate whether rainwater could be harvested and used to meet water demand of rainfed paddy.  As generally known, yield of rainfed paddy was low compared to that of irrigated paddy.  The study was performed by simulating a model of “Sawah-Kolam” system.  Daily 10 year climatological data from Metro City of Lampung Province was used in the study.  The program was written in Professional VisSim 4.0.  Three scenarios of alternative planting schedules (January, February, and March) were tested.  Results implied that without a collection system, rainwater might not be sufficient to grow rainfed paddy.  It was demonstrated that “Sawah-Kolam” system was capable of sufficing water requirement of rainfed paddy.  Huge rainwater of more than 90% could be saved, thus reducing a lot of runoff volume.  In term of pond size, February appeared to be the most optimum growing season of all other months for Metro City, in that the pond area (1,400 m2) required was the smallest.
Increasing of Rice Yield by Using Growth Promoting Endophytic Bacteria from Swamp Land Fitri, Siti Nurul Aidil; Gofar, Nuni
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.271-276

Abstract

Increasing of Rice Yield by Using Growth Promoting Endophytic Bacteria from Swamp Land (SNA Fitri and N Gofar):  Swamp land has can be used as a paddy field that will be potential as a rice source However, this land has some limiting factors such as low fertility. On the other hand, continous used of inorganic fertilizer to improve soil fertility will also have some disadvantages. Therefore,  an alternative method as  fertilizers complement is needed.  Biofertilizer  is potential to be developed.  Previous research had succeeded to explore and selected some bacteria from rice tissues grown on swamp land.  That research had found two bacteria Consortium were named as Growth Promoting Endophytic Bacterial Consortium (GPEBC).  The aims of this research were (1) to evaluate the effect of a GPEBC population density and a level of N fertilizer on plant N absorption, and rice yield in the swamp soil, and (2) to find out the optimal population density of GPEBC and optimal dosage of N fertilizer on plant N absorption and rice yields in the swamp soil.  The research used a factorial completely randomized design with 3 factors and 3 replicates.  The first factor was a kind of GPEBC which consisted of Consortium A and consortium B.  The second factors was population density of GPEBC which consisted of 0 CFU mL-1, 107 cfu mL-1, 109 cfu mL-1, and 1011 cfu mL-1.  The third factor was N-fertilizer dosages which consisted of 50% of plant nitrogen necessity (equivalent to 57.50 kg N ha-1), 75% of plant nitrogen necessity (equivalent to 86.25 kg N ha-1), and 100 % of plant N necessity (equivalent to 115 kg N ha-1).  The research showed that GPEBC of the Consortium B had a better effect on rice yiels than Consortium A.  The population density of 107 cfu mL-1 of GPEBC increased the growth and the yield of rice grown on swamp soil. Treatment combination of 75% of plant N necessity, and 107 cfu mL-1 of population density produced the best production of Consortium B  (GPEBC) for rice grown on swamp soil.
Water Table Fluctuation in Tidal Lowland for Developing Agricultural Water Management Strategies Imanudin, Momon Sodik; Armanto, Edi; Susanto, Robiyanto Hendro; Bernas, Siti Masreah
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.277-282

Abstract

Water Table Fluctuation in Tidal Lowland for Developing Agricultural Water Management Strategies (MS Imanuddin, E Armanto, RH Susanto and SM Bernas):The research objective is to evaluate the water status in the tertiary block of tidal lowland for developing water management strategies and cropping pattern for food crop agriculture. The research was conducted in tidal lowland reclamation areas of Delta Saleh South Sumatera. The methodology used in this research was survey and monitoring. The result showed that the study area has a potential of acid sulphate soil which is indicated by phyrite layer at 60 cm below the soil surface. Variation of water table was very high in the range of 0-2 cm at rainy season and it was drop up to 90 to 100 cm below soil surface at dry season. This conditions result in the soil oxidation and the pH drop up to 2.5-3.5 (very acid). Analysis of water surplus and deficit during one year period was calculated by surplus excess water under 30 cm (SEW-30) and showed that the area study was experienced water deficit. Analysis of groundwater effect on soil moisture content showed that the critical water level was in 60 cm below soil surface. The soil moisture content at this point in the root zone was dropped into the wilting point level. It means that the water availability for crop water requirement is inadequate. For sustainable agriculture in the area study, the water table should be maintained in 50-60 cm below soil surface. Therefore, the recommendation of water management strategies in the study area is water retention in combination with control drainage system.
Improvement of Soil Chemical Properties of Typic Hapludult After Application of Organic and Inorganic Fertilizers Mubarok, Syariful; Kusumiyati, Kusumiyati; Muhardiono, Iman; Yuniarti, Anni; Rosniawati, Santi; Suminar, Erni
JOURNAL OF TROPICAL SOILS Vol. 22 No. 3: September 2017
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2017.v22i3.131-137

Abstract

Tuberose (Polyanthes tuberosa L.) is a potential flowering plant that will be developed in Jatinangor, West Java, Indonesia. However, the characteristics of Typic Hapludult soil in Jatinangor , i.e. clay texture, acidic pH, and high amount of total-P but low in available-P cause the tuberose difficult to grow optimally. The aim of this study was to obtain the potential ratio of organic and inorganic fertilizer dosages for tuberose grown on Typic Hapludult. The combinations of organic and inorganic fertilizers with different ratios (0/0; 0/1; 1/0; 0.5/0.5; 0.5/1; 1/0.5; 1/1.5; 1.5/0; 1.5/0.5, and 1.5/) were applied. The application of the combination of organic and inorganic fertilizers showed positive effects on soil pH, available-P, total-P, and fresh weight of tuberose grown on Typic Hapludult. The application of 50% organic fertilizer + 50% inorganic fertilizer was an effective combination that was able to increase the fresh weight of tuberose up to 9240 g plant-1 or increasing the fresh weight by 39% in comparison to that in the control treatment (without fertilizer application). 
The Effects of Mixed Source Fertilizer Application on Vertisol Fertility and Growth of Mustard Syamsiyah, Jauhari; Sumarno, Sumarno; Suryono, Suryono; Muhamat Rajab, Nur Echsan; Aryaningrum, Ida
JOURNAL OF TROPICAL SOILS Vol. 22 No. 3: September 2017
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2017.v22i3.139-148

Abstract

Soil fertility is a crucial factor determining the growth and yield of plants. The increase of nutrient content and availability in soil can be achieved by fertilization. A field experiment was conducted using a Randomized Completely Block Design (RCBD) with two factors and three replications in order to study the effects of Mixed Source of Fertilizer (MSF) application on the nutrient contents in Vertisol and its relationship to the growth and yield of mustard. The first factor was the three MSF formulas (F1, F2, F3) and second factor was the doses of MSF (0; 2.5; 5.0; 7.5; 10 Mg ha-1) applied to the soil. At the end of the experiment, the soil pH, CEC, organic-C, total-N, available-P and exchangeable-K contents were measured. The results show that there are no significant differences on the soil chemical characteristics, such as pH, organic-C content, available-P, exchangeable-K, -Ca and -Mg measured after application of different MSF formulas to the soil. Meanwhile, the increase of MSF doses applied to the soil significantly increases organic-C content, total-N, available-P and exchangeable-K in the soil. The significant increase of available-P (by 29.13%) and total-N (by 24.1%) occured after application of MSF at 5.0 Mg ha-1 and the increase of exchangeable-K (by 50%) is achieved after application of 7.5 Mg ha-1, in comparison to that without MSF application. The height and fresh weight of mustard increase in accordance with the increase of MSF doses applied. The application of 10.0 Mg ha-1 MSF results in the highest height and fresh weight of the mustard up to 63.9% and 620%, respectively. The height and fresh weight of mustard are positively correlated to the total-N, available-P and exchangeable-K in the soil. The MSF is an alternative fertilizer that can be used to improve Vertisol fertility and plant growth. 
Sorptivity of an Inceptisol under Conventional and Reduced Tillage Practices Rachman, Achmad; Ariani, Ratri; Budiyanto, Arief
JOURNAL OF TROPICAL SOILS Vol. 22 No. 3: September 2017
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2017.v22i3.149-154

Abstract

The amount of water captured and stored in the soil profile until the next precipitation events is of great importance in dryland agro-ecosystem for successful crop production. The soil’s ability to rapidly capture and store water precipitation can be accessed through measuring soil sorptivity. The objectives of this study were to evaluate the effects of tillage, i.e. reduced and conventional tillages, on soil sorptivity, and to understand how sorptivity is related to surface soil bulk density and water stable aggregates. The experiment was conducted on a site, which has been continuously planted with corn twice a year for more than 10 years.  The predominant soil in the study site is Typic Haplusteps. Ponded infiltration measurements were used to determine soil sorptivity.  Six positions, 15 meters a part, were chosen within each treatment to measure sorptivity, bulk density and water stable aggregates.  Conventional tillage resulted in higher sorptivity (p<0.05), lower surface bulk density (p<0.05), and significantly lower water stable aggregates (p<0.01) than reduced tillage treatment. Sorptivity was negatively correlated to bulk density and positively correlated to water stable aggregates. Better correlations were found between sorptivity and both bulk density (R2 = 0.67) and water stable aggregates (R2= 0.81) under reduced tillage than under conventional tillage treatment.  Conventional tillage was found to enhance soil sorptivity in comparison to reduced tillage system. Appropriate soil management is important to maintain proper soil porosity in the field for better rainfall harvesting and plant growth especially in the dryland ecosystem. 

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