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The Dexter “S-value” (S gi ) is a promising new indicator of soil physical quality (SPQ), but it is not well tested against established indicators, such as relative field capacity (RFC), plant-available water capacity (PAWC), air capacity (AC), macroporosity (P MAC ), bulk density (BD), organic carbon content (OC), and structural stability index (SI). Furthermore, all SPQ indicators...
Soil physical quality (SPQ) is assessed by comparing values of “indicator” soil properties (e.g. bulk density, air capacity) to “ideal ranges” established in the literature. These ideal ranges may not be optimal for any particular soil or field site, however, as they are only “guidelines” based on broad soil types. The objective of this study was to determine if more relevant estimates of optimal...
Soil organic carbon (SOC) associated with clay plus silt sized particles (<20 μm) in uncultivated grassland soils has been proposed to have a maximum concentration that is referred to as the soil protective capacity. For cultivated soils, SOC is lost from the soil during various operations such as tillage, crop removal, lack of a crop cover between cropping seasons and as a result this SOC is typically...
Optimal values of soil physical quality (SPQ) parameters for enhancing field-crop productivity while maintaining or improving environmental health are still largely unknown. We hypothesized that progress toward identifying optimal values for some SPQ parameters might be made by comparing parameters obtained from long-term conventional tillage cropping (CT), long-term no-tillage cropping (NT), and...
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