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Soil water is the content of water in an unsaturated system (also, the vadose zone), that is, the soil above the groundwater or the water table. Of particular importance is the nature of water and its interaction with the soil particles.
Soil water affects the moisture available to organisms as well as soil aeration status, the nature and amount of soluble materials, the osmotic pressure, and the pH of the soil solution. Water acts physically as an agent of transport by mass flow and as a medium through which reactants diffuse to and from sites of reaction.
Soil water content affects the moisture and amount of nutrients available to plants and soil aeration status. Soil water content can be measured on a mass or volume basis. Gravimetric soil water content is the mass of water in the soil, measured as the difference between the moist soil and the soil dried at 105°C, known as the oven-dry weight.
29 Ιουλ 2015 · Soil is a non-renewable dynamic natural resource that is essential to life. Water movement, water quality, land use, and vegetation productivity all have relationships with soil. This article introduces many important soil concepts including development, classification, properties (physical, chemical, and biological), quality, and conservation.
Physically, water is the diffusive medium that mediates the movement of gases, solutes, and particles in soils. Water regulates the transfer of heat, thereby helping buffer...
Definition of Soil Moisture. Soil moisture is the amount of water in the upper layer of soil that interacts with the atmosphere. The depth of this active layer varies with soil type and vegetation, but is typically about the top 1 m. Soil moisture can be expressed in different units.
Infiltration and permeability describe the manner by which water moves into and through soil. Water held in a soil is described by the term water content. Water content can be quantified on both a gravimetric (g water/g soil) and volumetric (ml water/ml soil) basis. The volumetric expression of water content is used most often.
