Particle Size

Particle Size: The naked eye cannot see the spaces and different sized fractions that exist in soil. In this video, a glass jar, beads of various sizes, and a golf ball or two illuminate size fraction differences as well as air spaces and water.

Dispersion and Flocculation

Dispersion and Flocculation: This demonstration shows the effect of calcium (from gypsum) on bringing dispersed soil particles together as aggregates to aid in reclaiming soils with high levels of sodium.

Gypsum and Sodic Soils

Gypsum and Sodic Soils: Water movement through a sodium-affected soil is improved by the addition of calcium from gypsum. Water that is applied enters into the soil and continues to wet the profile in the presence of calcium.