نتایج جستجو برای: clayey soil

تعداد نتایج: 181371  

2007
Randall B. Brown

A prototype map of radon potentials in Alachua County, Florida is being developed to demonstrate the feasibility of defining geographic criteria for implementing radon-protective building construction standards. Because of regulatory needs and sensitivities, the map is being developed independent of institutional boundaries or of particular present radon limits. I t defines the radon source pot...

2017
Ognjen Žurovec Bishal Kumar Sitaula Hamid Čustović Jasminka Žurovec Peter Dörsch

Conservation tillage is expected to have a positive effect on soil physical properties, soil Carbon (C) storage, while reducing fuel, labour and machinery costs. However, reduced tillage could increase soil nitrous oxide (N2O) emissions and offset the expected gains from increased C sequestration. To date, conservation tillage is barely practiced or studied in Bosnia and Herzegovina (BH). Here,...

2005
Qi-He YANG Wan-Hui YE Xiong DENG Hong-Ling CAO Yun ZHANG Kai-Yang XU

Mikania micrantha H.B.K is an invasive alien weed in South China. To help understand the mechanisms of its invasiveness, we studied its seed germination ecophysiology. We found that the optimal temperatures for seed germination were 25, 30, 15/30°C (night/day), and an ambient temperature (24-32°C). Germination percentage (GP) in dark was less than 10%, and it increased with increasing light int...

2006
M. T. Simmons R. James Ansley W. R. Teague

The majority of studies on woody–herbaceous interactions have focused on the effects of trees on grasses; relatively few have looked at grass effects on adult trees. In a two-year study in a temperate savanna in northern Texas, tree (Prosopis glandulosa) basal area increased significantly following removal of associated grasses, the response being highly variable in time and space. Tree respons...

2007
Rosilaine Carrenho Sandra Farto Botelho Trufem Vera Lúcia Ramos Bononi Eraldo Schunk Silva

(The effect of different soil properties on arbuscular mycorrhizal colonization of peanuts, sorghum and maize). Arbuscular mycorrhizal fungi (AMF) are important for plant growth since they increase mineral influx. However, symbiosis efficiency is affected by many environmental factors. This study evaluated the effects of different treatments (+/phosphorus; +/liming; +/organic matter; field, san...

2016
S. R. GARCIA F. M. VILLALOBOS-CASTALDI P. TREJO C. MARTÍNEZ

In this paper the use of the Hilbert-Huang Transform (HHT), for the decomposition and characterization of seismic ground response, is discussed. The HHT, integrated by the Empirical Mode Decomposition (EMD) and the Hilbert Transformation (HT), enables engineers to analyze non-stationary oscillation systems and to obtain more detailed intensity descriptions on time-varying frequency diagrams. Th...

2002
Ian D. Jolly Glen R. Walker Peter J. Thorburn

Dieback of native Eucalyptus largiflorens forests is an increasing problem on the floodplains of the lower River Murray, southern Australia. Salinisation of floodplain soils, as a result of the changed hydrological management of the River Murray, appears to be a primary cause of the dieback. Regulation of the River Murray has reduced the frequency of large flood events by a factor of approximat...

2002
C. J. Miller

Tests were conducted to determine the variation of water content and pore water suction for compacted clayey soils. The soils had varying amounts of clay fraction with plasticities ranging from low to high plasticity. The unsaturated soil behavior was investigated for six conditions, covering a range of compactive efforts and water contents. The experimental data were fit to four commonly used ...

2015
José A. M. Demattê Victor Wilson Botteon

New tools for soil mapping are needed to increase speed and accuracy of pedological mapping processes. This study integrated various technologies to map soils of the Piracicaba region in São Paulo State, Brazil. Each technology was expected to provide different information to design a detailed map. We carried out field survey and soil sampling for laboratory analysis. Initially, we conducted fi...

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