ESTIMATION OF SOIL HYDROLOGICAL CHARACTERISTICS USING STRUCTURE AND TEXTURE
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- Recommended for : Student Researchers
- NGN 3000
ABSTRACT
Hydrologic analyses often involve the evaluation of soil water in-filtration, conductivity, storage, and plant-water relationships. To de-fine the hydrologic soil water effects requires estimating soil water characteristics for water potential and hydraulic conductivity using soil variables such as texture, organic matter (OM), and structure. Field or laboratory measurements are difficult, costly, and often impractical for many hydrologic analyses. Statistical correlations between soil texture, soil water potential, and hydraulic conductivity can provide estimates sufficiently accurate for many analyses and decisions. This study developed new soil water characteristic equations from the currently available USDA soil database using only the readily available variables of soil texture and OM. These equations are similar to those previously reported by Saxton et al. but include more variables and application range. They were combined with previously reported relationships for tensions and conductivities and the effects of density, gravel, and salinity to form a comprehensive predictive system of soil water characteristics for agricultural water management and hydro-logic analyses. Verification was performed using independent data sets for a wide range of soil textures.
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