Soil physical properties (texture, structure and organic matter)
control the total pore space and pore size distribution in soil.
Water movement in soil occurs under saturated and unsaturated
conditions though soil pores. Saxton et. al. (1986) estimated
generalized soil-water characteristics from texture and
developed a set of equations from which soil-water
characteristic equations for a number of soil textural classes
can be derived.
We have used the equations of Saxton et al. (1986) to calulate
soil hydraulic properties of soil and have developed an algorithm
to determine the soil textural class using the Canadian Soil textural
triangle and the US Texture Triangle. As the equations published by
Saxton et al. (1986) are not valid for soils with low and high clay
content, we have modified our program to meet the boundary conditions
set in their publication. We have also created a clickable graphic
which returns values of soil texture and hydraulic properties. In
addition, we have created a work table which allows comparison of data
for three different soils. Please explore impact of
texture
on hydraulic properties of soil via
the following links:
- Canadian System
- American System
Reference:
Saxton, K.E., W.J. Rawls, J.S. Romberger, and R.I. Papendick. 1986.
Estimating generalized soil-water characteristics from texture.
Soil Sci. Soc. Am. J. 50(4):1031-1036
Roger Nelson's soil texture triangle
hydraulic
properties calculator, web version.
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