نتایج جستجو برای: clayey soils

تعداد نتایج: 49560  

2013
Mauricio Boton Emilien Azéma Nicolas Estrada Farhang Radjaï Arcesio Lizcano

As a first step towards particle-scale modeling of clayey soils, we investigate the mechanical behavior and microstructure of assemblies of three-dimensional rectangular platy particles by means of the discrete element method. Several samples composed of particles of different levels of platyness (ratio of width to thickness) were numerically prepared and sheared to large deformations. We analy...

Journal: :Journal of nematology 1970
S T Miyagawa B Lear

Ditylenchus dipsaci larvae survived in soil without a host plant for at least 242 days when held at 15 C and 21 C. Larvae held at 15 C remained infective for 212 days. Moisture levels within both clayey and sandy soils did not appreciably affect recovery of larvae. Active nematodes recovered from soil are not necessarily infective. Temperatures of -12, 0 and 4 C had little adverse effect on lar...

2016
Judith Zimmermann Mary K. Musyoki Georg Cadisch Frank Rasche

We studied the effects of Fusarium oxysporum f.sp. strigae (Fos), a soil-borne biocontrol agent (BCA) against Striga hermonthica, on total fungal and arbuscular mycorrhizal fungal (AMF) taxa in rhizospheres of maize in both clayey and sandy soil. Effects of Fos-BCA 'Foxy-2' were evaluated against (1) S. hermonthica presence, and (2) organic fertilization with Tithonia diversifolia residues at 1...

2015
Mauricio BOTON Nicolas ESTRADA Emilien AZÉMA Farhang RADJAÏ

This work was carried out in the framework of a larger project devoted to the micro-mechanical modeling of clayey soils by means of discrete element simulations. Here, we study the rheology and microstructure of granular media composed of platy particles. The particles are three-dimensional square plates, approximated as spheropolyhedra. Several samples composed of particles of different levels...

Journal: :IOP conference series 2022

Abstract Clayey soils swell on absorbing water and shrinks drying, any constructions built them are subjected to the differential settlements due loss of support from soil. Stabilization clays with various additives have considerable successes. Lime, cement, CaCl 2 , fly ash (FA), ground granulated blast furnace slag (GGBS), pond other chemical reagents been effective in stabilizing expansive i...

Journal: :Renewable Agriculture and Food Systems 2021

Abstract Climate change and soil fertility decline are major threats to smallholder farmers' food nutrition security in southern Africa, cropping systems that improve health needed address these challenges. Cropping invest organic matter, such as no-tillage (NT) with crop residue retention, have been proposed potential solutions. However, a key challenge for assessing the sustainability of NT i...

Journal: :Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería 2020

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