The soil around a drain well is traditionally divided into smeared zone and undisturbed zone with constant hydraulic conductivity. In reality, hydraulic conductivity of the soil changes continuously and it may not be always appropriate to approximate its distribution with two zones. In this study, the horizontal hydraulic conductivity of the soil is described by an arbitrary function of radial ...

In this study the impact of production work on the skid roads that have been carried out for many years by manpower animal power or machinery in a beech (Fagus orientalis Lipsky) stand have been examined. For this purpose, herbaceous understory, forest floor and soil samples were collected from the undisturbed area and the skid road. Weight per unit area (kg ha(-1)), organic matter ratio and mo...

3.2. Effects on soil health, quality and fertility 3.2.1. Soil organic matter 3.2.2. Biological properties 3.2.3. Chemical properties 3.2.3.1. pH 3.2.3.2. N 3.2.3.3. P 3.2.3.4. K 3.2.3.5. Other elements 3.2.3.6. Electrical conductivity 3.2.3.7 Cation Exchange Capacity 3.2.4. Physical properties 3.2.4.1. Water holding capacity and porosity 3.2.4.2. Bulk density/Penetration resistance 3.2.4.3. Ag...

crops every 3 yr) and even continuous (annual) cropping in some instances. For example, annualized grain yields Water is the principle limiting factor in dryland cropping systems. for WCF are 75 to 100% greater than WF (Peterson et Surface soil physical properties influence infiltration and cropping al., 2000). Cropping intensification has been possible systems under no-till management may affe...

The properties of soils may be characterized by many attributes. However, there is not a systematic procedure to objectively select the measurement parameters that may be used to assess soil quality. Following the data collection, it is often a dilemma to decide how many and which of the measured parameters should be included in the assessment as the outcomes may be influenced by the parameters...

dispersivity (?) and effective transport porosity (?eff) are input parameters in equilibrium convection dispersion equation (cde). normally these parameters are obtained from breakthrough curves by inverse method. however, obtaining breakthrough curves in the field is not often possible in practice. the objective of this study was to estimate ? and feff from soil hydraulic data. for this purpos...

With the aim of setting up a simpli®ed method to measure hydraulic conductivity of structured soils at saturation, a method reported by Ahuja et al. (Soil Sci. Soc. Amer. J. 48 (1984) 699±702; Soil Sci. 148 (1989) 404±411), which also refers to the generalised equation of Kozeny±Carman and the scaling theory, is tested in this paper. Data were elaborated from hydraulic conductivity measurements...