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The Limiting Factors of Sand Bed Reactor for
Heterotrophic Denitrification Process in
Tropical Conditions
By Sarwoko Mangkoedihardjo © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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65-74 Page(s)
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Abstract
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This research was carried out in a sand bed reactor for heterotrophic denitrification processes. A solution mixture of 24 mg nitrate-N/L and 64 mg methanol-CH3OH/L was prepared for an influent of heterotrophic reactor. Influent pH level was maintained at 6.5 with the operating temperature in the range of 20-35Celcius. By adjusting nitrogen volumetric loading (NVL) and phosphorus concentrations at tropical operating conditions, it was found that the detention time in the reactor and the phosphorus concentrations of influent were the limiting factors for heterotrophic denitrification process to assure free-nitrite effluent The maximum detention time was 1 hour and the phosphorus concentrations were 0... |
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Keywords
Sand bed, heterotrophic denitrification, nitrogen volumetric
loading (NVL), phosphate, methanol, glucose, acetic acid
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Soil Tilth Index for Malaysian Paddy Fields
By S.M. Bockari-Gevao, W.I. Wan lshak, Y. Azmi & C.B.S. Teh © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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53-63 Page(s)
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Abstract
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Tillage treatments have been an integral part of many soil and crop management studies on the multifaceted concept of soil tilth. If soil tilth can be represented as a tillage index, it could be used to schedule farming operations and to improve soil management, which will consequently lead to sustainable, productive and profitable agriculture. This study was undertaken to investigate the effect of rotary tillage on some soil physical properties (bulk density, cone index, plasticity index, aggregate uniformity coefficient) and organic matter, and to develop and evaluate a soil tilth index based on changes of these soil properties... |
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Keywords
Rotary tillage, soil physical properties, tilth index, crop yield,
paddy field
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Domestic Sewage Sludge Application to an Acid Tropical
Soil: Part I. Sludge as an N Fertiliser for Maize
By Rosazlin, I. Che Fauziah, A.B. Rosenani & S. Zauyah © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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39-52 Page(s)
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Abstract
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Land application of sewage sludge is considered the most economical; it also provides an opportunity to recycle beneficial plant nutrients and organic matter to soil for crop production. The application of sewage sludge as a source of N fertiliser for maize production was investigated in this study. Application of sewage sludge or inorganic N fertiliser (NH4SO4) produced significantly higher yields than the control (without N). The rate of 420 kg N ha-1 sewage sludge gave the highest dry matter yield for the 1st cycle and 746 kg N ha-1 sewage sludge for the 3rd cycle... |
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Keywords
Sewage sludge, biosolid fertilizer, nitrogen mineralisation,
moisture content, dry matter yield
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Adsorption, Desorption and Mobility of Metsulfuron
Methyl Herbicide in Malaysian Agricultural Soils
By Saraswathy Sinnakkannu, Abdul Rani Abdullah & Mhd Radzi Abas © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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29-38 Page(s)
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Abstract
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The adsorption, desorption and mobility of metsulfruon methyl, a commonly used herbicide in Malaysia, was investigated in some selected agricultural soils namely Persit, Segamat, Kiol, Sedu and Penor as a means to understand the potential of the herbicide to contaminate the Malaysian soil environment. The range of organic matter content of the soil samples was 2.3 to 33.8, while the range of pH was 3.2 to 6.5. The adsorption ofmetsulfuron methyl to soils was found to best fit a Freundlich adsorption isotherm with distribution coefficients (Kd) ranging from 0... |
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Keywords
Environmental fate, adsorption, desorption, metsulfuron methyl,
her bicide, tropical soil, leaching, mobility
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Measured and Modelled Soil Water Characteristic
Curves for a Sandy Loam Soil
By M.S. Mirjat, M. Rodgers, J. Mulqueen & P. Gibbons © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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15-27 Page(s)
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Abstract
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Soil water characteristic (SWC) curves were established for various depths ranging between 0.05 and 1.5 m in a free draining sandy loam soil with a deep watertable in the laboratory and between 0.2 and 2 m depth in the field. In the laboratory, drying curves were established applying incremental suctions and measuring corresponding water contents, while in the field, soil suction and water contents at various depths were measured by tensiometers and neutron probes, respectively during infiltration and drainage... |
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Keywords
Soil water characteristic curve, soil suction, soil water content,
fitting parameters
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Aggregate Breakdown Rates of Some Malaysian Soils
and Relation to Aggregate Properties
By Teh, C.B.S., T. Jamal & S. Nuranina © 2005. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 9, Issue 1
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1-13 Page(s)
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Abstract
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The objectives of this study were to determine the rate of aggregate breakdown of three aggregate sizes from three highly-weathered Malaysian soils and relate the aggregate breakdown rate with several aggregate constituents. Bungor, Munchong and Serdang soils (from orders Ultisol and Oxisol) were used. For each soil type, three macro-aggregate size fractions were separated: 3-5, 1-2 and 03-0.5 mm.
Each aggregate size fraction was wet-sieved for six time durations to determine breakdown rate of aggregates with time... |
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Keywords
Aggregate stability, erosion, organic matter, wet-sieving
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The Poverty of Empiricism
By Jens Mende © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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189-210 Page(s)
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Modular Inference Trees for Expository Reports
By Jens Mende © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
173-187 Page(s)
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Informing Clients through Multimedia Communications
By Marco Furini
Marco Roccetti © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
39-54 Page(s)
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The Impact of National Culture on Worldwide eGovernment Readiness
By Zlatko J. Kovacic © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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143-158 Page(s)
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Informing Citizens in a Highly Restrictive Environment Using Low-Budget Multimedia Communications: A Serbian Case Study
By Aleksandar Spasic
Miloje Nesic © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
245-262 Page(s)
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A Reflexive Model of ICT Practices in Organizations
By Jan-Oddvar Sornes
Keri Keilberg Stephens
Larry Davis Browning
Alf Steinar S?tre © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
123-142 Page(s)
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Information Politics and Information Culture: A Case Study
By Bob Travica © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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211-244 Page(s)
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An Empirical Evaluation of Visual Metaphors in the Animation of Roles of Variables
By Tuija St?tzle
Jorma Sajaniemi © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
87-100 Page(s)
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Informing the HR Hiring Decision of IT Personnel
By John E. Anderson
Kevin S. Barrett
Paul H. Schwager © 2005. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 8
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0 views | Related Articles |
281-302 Page(s)
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