how to determine the color of the soil
munsell soil color chart
provide infos on drainage condition, mineralogy, ok content
soil color
particle size distribution of soils, relative proportion
soil texture
particle size of 2mm
fine earth
particle size of 2 to 7.5
gravel
particle size of 7.5 to 25mm
cobbles
particle size of 25mm
rocks and boulders
determine the soil texture
feel method
determine soil texture
sieve method and hydrometer and pipette method
experess soul texture
soil textural class