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The Kinetics of Biodeconcentration for Nitrate:
Case Study on Microbial Denitrification and
Plant Absorption
By Sarwoko Mangkoedihardjo © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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67-75 Page(s)
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Abstract
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This research was conducted to study the kinetics processes of microbial denitrification and the kinetics processes of plant absorption. The test plants were spinach, peanut and grass. The test solution contained nitrate of 24 mg N/L, glucose of 64 mg C6H12O6/L and phosphate of 0.5 mg P/L. The results showed that the kinetics of nitrate biodeconcentration processes were exponential: C1 = Co e(-kt). The rate constant for microbial denitrification was stated kd which was equal to 0.0786 day-1. The rate constant of plant absorption was stated as ks, and the rates for spinach, peanut and elephant grass were 0... |
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Keywords
Biodeconcentration, microbial denitrification, plant absorption,
kinetics rate constant, baJf time, spinach, peanut, elephant grass
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Effect of Coffee Bean Residue and Time on
Soil Nitrogen Availability
By Tenaw Wokaehu, M.H.A. Husni, A.R. Anuar & Zaharah A.R © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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53-65 Page(s)
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Abstract
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Burning and dumping of coffee bean residue has brought on environmental problems. On the other hand, low soil fertility has resulted in declining crop production. For efficient use, mineralisation of N from coffee residue applied as surface mulch was evaluated using four rates of residue (0, 3, 6 and 9 Mg ha-1) combined with five periods of incubation (0, 30, 60, 90 and 120 days) in a pot experiment with three replicates. The low quality coffee residue resulted in immobilisation of soil N (varied between - 7... |
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Keywords
coffee residue, N mineralisation, N release, N immobilisation,
time, mineralisation rate constant, Ethiopia
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Domestic Sewage Sludge Application on an Acid
Tropical Soil: Part II. Heavy Metals Uptake by Maize
and Accumulation in the Soil
By Rosazlin A, I. Che Fauziah, A.B. Rosenani & S. Zauyah © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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35-52 Page(s)
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Abstract
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Recycling of sewage sludge to agricultural land can be beneficial from the aspect of essential plant nutrients and organic matter supplement to the soil and plant system. However, sewage sludge also contains varying amounts of heavy metals which may pose a metal toxicity hazard to crops and consumers of these crops. Thus, the uptake of heavy metals by crops and the fate of these heavy metals in soils need to be monitored. In general, domestic sewage sludge has lower concentrations of heavy metals compared to the mixed light industry and domestic sludge type... |
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Keywords
Sewage sludge, heavy metals, correlation study, transfer
co-efficient, maximum permitted concentrations
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Modelling of Escherichia coli Density on Land and
Concentration in Surface Runoff
By T. Y. Ling, R. L. Bengtson, C. M. Drapcho,
E. C. Achberger, G. J. Sabbagh & J. Jackson © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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25-34 Page(s)
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Abstract
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Integrated farming of crop and animal enables resources from animal waste to be utilised. However, bacterial pollution is a concern. In this study, a bacterial model, ECOLI, was developed to simulate Escherichia coli density daily on land and its concentration in surface runoff. Loss of E. coli was assumed to occur through decay, runoff, sediment and percolation. E. coli decay was assumed to follow the first order decay affected by soil pH, soil temperature and soil moisture. In testing the model, the ECOLI model was interfaced with the GLEAMS-SWT hydrologic and erosion model... |
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Keywords
Modeling, E. coli, runoff, die-off, decay, pollutant
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Saturated Hydraulic Conductivity of Some Saprolites
from Peninsular Malaysia
By J. Hamdan, Chng Loi Peng & B. Ruhana © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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13-24 Page(s)
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Abstract
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A study was conducted to evaluate the hydraulic conductivity of saprolites and their potential use as a wastewater treatment in Malaysia. Samples of granitic, basaltic, schist, and shale saprolites were taken from 16 locations throughout Peninsular Malaysia.
These samples were morphologically described and air-dried for physical analyses. The infiltration rate study of the saprolites was conducted both in-situ and in the laboratory. The study showed that granitic saprolite had the highest K(sat) value while basaltic had the lowest value in both laboratory and in-situ methods... |
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Keywords
Saprolite, infiltration rate, hydraulic conductivity, wastewater
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Isolation of IAA-Producing Rhizobacteria for Enhanced
Growth of Sweetpotato
By O. Radziah, M. Lusi & A. R. Anuar © 2006. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 10, Issue 1
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1-11 Page(s)
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Abstract
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The ability to produce the indole-3-acetic acid (IAA) by plant growth-promoting rhizobacteria (PGPR) is one of the mechanisms for promoting plant growth. The survival of sweetpotato under low input farming could be associated with the production of such hormones. Studies were conducted to isolate IAA-producing rhizobacteria from rhizosphere of different varieties of sweetpotato grown on different soils. Media containing root exudate of sweetpotato var. Gendut was used to screen for rhizobacteria associatedwith sweetpotato... |
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Keywords
Indole-3-acetic acid, plant growth-promoting rhizobacterla, sweetpotato
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Task Complexity and Informing Science: A Synthesis
By T. Grandon Gill
Richard C. Hicks © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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1-30 Page(s)
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Reclassification of Electronic Product Catalogs: The ?Apricot? Approach and Its Evaluation Results
By Sven Abels
Axel Hahn © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
31-47 Page(s)
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Using IT to Inform and Rehabilitate Aphasic Patients
By Cec?lia Sik Lanyi
Zoltan Geiszt
Viktor Magyar © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
163-179 Page(s)
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Good Intuition or Fear and Uncertainty: The Effects of Bias on Information Systems Selection Decisions
By Kieren Jamieson
Paul Hyland © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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49-69 Page(s)
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Towards the Automatic Generation of Virtual Presenter Agents
By Anton Nijholt © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
97-110 Page(s)
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Would Regulation of Web Site Privacy Policy Statements Increase Consumer Trust?
By David B. Meinert
Dane K. Peterson
John R. Criswell II
Martin D. Crossland © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
123-142 Page(s)
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Diagnostic and Functional Dependencies of Credibility
By Zbigniew J. Gackowski © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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225-241 Page(s)
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A Systems Approach to Conduct an Effective Literature Review in Support of Information Systems Research
By Yair Levy
Timothy J. Ellis © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
181-212 Page(s)
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Information Warfare and Deception
By William Hutchinson © 2006. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 9
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0 views | Related Articles |
213-223 Page(s)
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