نتایج جستجو برای: silty soils

تعداد نتایج: 49687  

Journal: :Data 2022

Evaporation from soils is critical for agricultural water management. This requires a clear understanding of the retention and soil shrinkage behavior during escape due to fertilizers usage. Based on laboratory testing, this paper provides comprehensive dataset generated determination geotechnical properties inert silty sand active lean clay using distilled saline pore fluid under ambient condi...

2011
Jincai Ma A. Mark Ibekwe Xuan Yi Haizhen Wang Akihiro Yamazaki David E. Crowley Ching-Hong Yang

The persistence of Shiga toxin-producing E. coli O157:H7 in the environment poses a serious threat to public health. However, the role of Shiga toxins and other virulence factors in the survival of E. coli O157:H7 is poorly defined. The aim of this study was to determine if the virulence factors, stx₁, stx₂, stx₁₋₂, and eae in E. coli O157:H7 EDL933 play any significant role in the growth of th...

Journal: :Geotechnics 2022

There are many empirical equations published for unsaturated fine-grained soils. However, there is only one equation established silty sand using the shear-box test and filter-paper-based suction test, but with range of 0 to 200 kPa. It reported that a significant discrepancy between predicted values results apparent cohesion within 100 kPa coarse-grained The purpose this research study effect ...

Journal: :Applied sciences 2021

The aim of the research was to show changes taking place in soils as a result influence anthropogenic factors form intensive horticulture and pollution within city. It made on basis distribution individual fractions well available total Cu forms profiles garden located at houses family allotment gardens six cities south-eastern Poland. took into account granulometric composition according which...

Journal: :international journal of civil engineering 0
m. khodaparast civil engineering department, university of qom, qom, iran a.m. rajabi civil engineering department, university of qom, qom, iran m. mohammadi civil engineering department, university of qom, qom, iran

the dynamic probe is an effective tool used in site investigation. it is more economic than the use of direct drilling, particularly in explorations with moderate depth. this paper presents an experimental study to investigate the capability of using dynamic probing to evaluate the shear strength and compaction percent of fine soil. a series of dynamic probe tests were carried out at 6 differen...

Journal: :BIO web of conferences 2021

The work is devoted to the study of granulometric composition soils 120-year and 240-year agricultural development meadow-steppe landscape on example Belgorod region. In lateral distribution silt fraction contained in arable horizon, a significant increase its proportion lower parts soil catenas arable, for variations are less noticeable. averaged values content over slope profiles land showed ...

2014
L. H. Orellana L. M. Rodriguez-R S. Higgins J. C. Chee-Sanford R. A. Sanford K. M. Ritalahti F. E. Löffler K. T. Konstantinidis

UNLABELLED Microbial activities in soils, such as (incomplete) denitrification, represent major sources of nitrous oxide (N2O), a potent greenhouse gas. The key enzyme for mitigating N2O emissions is NosZ, which catalyzes N2O reduction to N2. We recently described "atypical" functional NosZ proteins encoded by both denitrifiers and nondenitrifiers, which were missed in previous environmental su...

2000
A. R. Barzegar M. A. Asoodar M. Ansari

Incorporation of crop residues into the soil can reduce its susceptibility to compaction. However, the signi®cance of incorporated crop residue at different soil water contents at the time of compaction and the compaction loads is not well documented. The compactibility of three soils which contained different amounts of sugarcane residue was investigated at different water contents and compact...

Journal: :Bioresource technology 2008
K R Sistani A Adeli S L McGowen H Tewolde G E Brink

Two studies were conducted for this research. First, a laboratory incubation to quantify broiler litter N mineralization with the following treatments: two soil moisture regimes, constant at 60% water fill pore space (WFPS) and fluctuating (60-30% WFPS), three soil types, Brooksville silty clay loam, Ruston sandy loam from Mississippi, and Catlin silt loam from Illinois. Second, a field incubat...

Journal: :Journal of Hydrology and Hydromechanics 2023

Abstract The presence of gravel in soils modifies the porosity, pore connectivity and size distribution soil matrix as well matrix-gravel interfaces. aim present study is to investigate effect relative volume samples with mass fractions 5,10, 20 wt% varying bulk densities (1.3, 1.45, 1.55, 1.60, 1.65 g cm –3 ) on (i) total field capacity, plant available water holding (ii) (iii) thermal capacit...

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