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Concentrations and Chemical Forms of Heavy Metals in
Some Ultisols in Johore, Peninsular Malaysia
By S. Zauyah, B. Juliana, & C.l. Fauziah © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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113-123 Page(s)
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Abstract
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The concentrations of heavy metals in soil are associated with biological and geochemical cycles and are influenced by anthropogenic activities such as agricultural practices, industrial activities and waste disposal. A total of 36 surface soil samples (Typic Kandiudult, Rengam Series) were collected from some major vegetable growing areas developed over granite. Twelve soils from areas not cultivated with vegetables but also developed over granite were also sampled for background values. The pseudo-total heavy metals, (Cu, Pb, Zn and Ni) were determined by the aqua-regia method... |
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Keywords
Copper, zinc, vegetable soils, chemical fractionation
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Characterization of Malaysian Sewage Sludges and Nitrogen Mineralization in Three Soils Treated with Sewage Sludge
By A.b. Rosenani, D. R. Kala And C.l. Fauziah © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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103-112 Page(s)
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Abstract
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Studies to determine the chemical composition of sewage sludges in Malaysia and potentially mineralisable nitrogen (No) and mineralization rate constant (k) of sewage sludge in three Malaysian soils are reported. The sludges collected from ten wastewater treatment plants in Malaysia were acidic in nature and the N, P, K, Ca and Mg contents were variable. The heavy metal (Pb, Cd, Cu, Mn and Ni) concentrations or the sludges, except for Zn, were below the European Union Maximum permitted level in sludges. In an incubation study, three topsoils of Bungor, Jawa and Serdang series were treated with three rates (0, 140 and 420 kg N ha-1) of dewatered sewage sludge and incubated about 60% of the water holding capacity for 12 weeks... |
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Keywords
Sewage sludge characterization, nitrogen mineralization.
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Amelioration of Cheringa Acid Sulfate Soil and Screening of
Acidity-Salinity Tolerant Rice Varieties in a Simulation Study
By Md. H.R. Khan, SM. Kabir,MM.A. Bhuiyan, H.-P. Blume,
Y. Oki & T. Adachi © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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87-102 Page(s)
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Abstract
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A simulation study was conducted to evaluate the effects of basic slag (BS10 : basic slag 10 t ha-1 and BS20 : basic slag 20 t ha-1), aggregate size (A20 : aggregate sizes of soil less than 20 mm and A30 : aggregate sizes of soil, 20 - 30 mm) and groundwater depth (Gw0 : no influence or groundwater and Gw50 : groundwater beneath 50 cm of the soil surface) in pre-leached Cheringa acid sulfate soil (Typic Sulfic Halaquept) in relation to the production and screening of the acidity-salinity tolerance of 18 rice cultivars ... |
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Keywords
Acid sulfate soil, aggregate size, basic slag, groundwater depth,
tolerant rice cultivars
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Enhancing Rice Establishment in Anaerobic Direct Seeding
Through Control of Weedy Rice
By VJeyanny, S.R. Syed Omar, M. Azmi & A.S. Juraimi © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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77-86 Page(s)
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Abstract
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A glasshouse and field trial was conducted to investigate the effects of pre-treated rice seeds on cultivated rice and weedy rice establishment in direct seeding planting system. Treatments applied were wet seeding (T1) and water (anaerobic) seeding at 10 cm flooding depth (T2). In the glasshouse trial, water seeding significantly reduced weedy rice seedling emergence almost three-fold compared to control; the usage or pre-treated seeds in both seeding methods significantly increased the viability of cultivated rice compared to weedy rice... |
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Keywords
Oryza sativa L., weeds, yield loss, pre-treated seeds, water seeding
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Carbon and Nitrogen Stocks of the Central Clay Plane:
Irrigated versus Rain-fed Vertisols
By A.R. Mubarak, OM.E. Elsham & F.A. Hamid © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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61-76 Page(s)
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Abstract
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Mitigation of atmospheric CO2 concentration and ensuring national food security could be achieved by increasing carbon sequestration in the soil. We estimated soil organic C and N sequestered in the long- (7C) years), medium- (46 years) and short- term (22 years) crop rotation systems of cotton (Gossypium hirsutum), sorghum (Sorghum bicolor), groundnut (Arachis hypogaea), wheat (Triticum aestivum) and fallow in Vertisols, both irrigated and rain-fed, of the semi-arid tropics of Sudan. Total C pool, comprising soil organic and inorganic C for the entire profile (0 - 0... |
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Keywords
Carbon, nitrogen, sequestration, semi-arid, Sudan, Vertisols
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Organic Matter, N and P Dynamics of Fine and Coarse
Roots in a Humid Subtropical Forest Ecosystem Exposed to
Disturbance in Meghalaya, Northeast India
By K. Upadhaya, H.N. Pandey, S.K. Barik & R.S. Tripathi © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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45-60 Page(s)
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Abstract
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Standing line (< 2 mm diameter) and coarse (> 2 mm diameter) root mass production, N And P accumulation, and turnover rate were studied in two pairs of protected and disturbed stands of a subtropical humid forest to examine the response of belowground parts to mild disturbance caused by above-ground vegetation by humans. Disturbance of mild intensity caused significant reduction in biomass accumulation and production of fine and coarse roots. The fine root (540-754 gm-2) and coarse root (307-387 gm-2) mass was higher in the protected stands, declining (line root: 422- 466 gm-2 coarse root: 247-305 gm gm-2) significantly in the disturbed stands... |
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Keywords
Fine and coarse root, biomass and production, Nand Pconcentration,
accumulation, subtropical humid forest, disturbance
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Effects of Anthropogenic Disturbance on Soil Microbial
Biomass C, N and Pin a Tropical Rainforest Ecosystem of
Assam, Northeast India
By A. R. Barbhuiya,A. Arunachalam, H.N. Pandey,
K. Arunachalam & M.L. Khan © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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31-43 Page(s)
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Abstract
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The effect of anthropogenic disturbance on soil microbial biomass C, N and P dynamics in a tropical rainforest ecosystem of Northeast India was studied in undisturbed, moderately disturbed and highly disturbed stands. Tree species richness in the community was drastically reduced due to disturbance, from 82 species in the undisturbed stand to 13 species in the highly disturbed stand. Soil organic C, total Kjeldahl nitrogen and P concentration was low in the disturbed stands compared to the undisturbed stand... |
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Keywords
Disturbance, microbial biomass-carbon, -nitrogen and
-phosphorus, soil, tropical rainforest, Northeast India
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Hydrophobicity of Soils Formed over Different Lithologies
Emmanuel Uzoma Onweremadu
By Emmanuel Uzoma Onweremadu © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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19-30 Page(s)
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Abstract
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Using a free survey technique and special analytical methods, wettability of soils derived from different parent materials in central Southeastern Nigeria were investigated in 2005. Resulting soil data were subjected to Analysis of Variance (ANOVA) using PROC mix-model of SAS, and some soil properties were regressed to identify leading predictors of soil hydrophobicity in the study area. Soil hydrophobicity varied among the soil groups and horizons (p < 0.05) in response to differences in soil properties. Soil moisture, organic matter, day, sand, sodium saturation were good predictors of soil hydrophobicity in soils of the study site although at varying levels of prediction and parameter combinations... |
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Keywords
Modelling, wettahility, parent materials, soil water, tropical soil
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Geochemical Distribution of Elements at Lipad and Tabin
Mud Volcanoes, Sabah
By Ting Teo Ming, Axel D. Poulse & Marcus Jopony © 2008. Malaysian Society of Soil Science
Malaysian Journal of Soil Science, Volume 12, Issue 1
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1-18 Page(s)
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Abstract
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A study was conducted to determine the chemical characteristics of mud volcanoes at Lipad and Tabin situated at Tabin Wildlife Reserve. Both areas comprise of inner zone (with absence of vegetative cover) and outer zone (with vegetative cover). The concentrations of Fe and Mn at the inner zone for both volcanoes ranged from 17390-24800 µg/g and 497-941 µg/g respectively. The total concentrations of Mg, Na, Ca and K were highest at the inner zones ranging from 3653-6088 µg/g, 1543-19472 µg/g, 291-2875 µg/g and 722-2428 µg/g, respectively... |
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Keywords
Mud volcano, geochemical distribution
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Resonance within the Client-to-Client System: Criticality, Cascades, and Tipping Points
By T. Grandon Gill © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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311-348 Page(s)
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Illusions of Significance in a Rugged Landscape
By T. Grandon Gill
Terry L. Sincich © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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197-226 Page(s)
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An Attention Economy Perspective on the Effectiveness of Incomplete Information
By Nitza Geri
Seev Neumann
Rebecca Schocken
Yishai Tobin © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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1-15 Page(s)
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The Single Client Resonance Model: Beyond Rigor and Relevance
By T. Grandon Gill © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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0 views | Related Articles |
281-310 Page(s)
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Bias, Misinformation and the Paradox of Neutrality
By Peter M. Bednar
Christine Welch © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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0 views | Related Articles |
85-106 Page(s)
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Improving Student Learning about a Threshold Conceptin the IS Discipline
By Chris Cope
Lorraine Staehr © 2008. Informing Science Institute
Informing Science: The International Journal of an Emerging Transdiscipline, Volume 11
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0 views | Related Articles |
349-364 Page(s)
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