How to Add Calcium Bentonite to Soil

Till or prod the ground to a depth of around 6 inches to loosen and open up the soil.

Sprinkle calcium bentonite particles evenly across the tilled ground. For every square yard and for light to heavy soils, use two to four pounds of calcium bentonite.

Sprinkle humus or mature compost, manure and sand mixtures on top of the calcium bentonite. For soil that already has a high concentration of sand, skip the addition of sand to the soil.

To create an all-purpose soil, add an equal amount of sand as clay, half as much manure and 50 percent more humus or compost.

For soil high in nitrogen, add an equal amount sand as clay, an equal amount of manure and an equal amount of humus or compost.

Make a loose soil with increased draining ability by adding the same amount of sand as clay, three times more humus or compost and no manure.

Re-till the area to blend the calcium bentonite and organic matter into the soil. Rake the soil to break up clumps and level the ground. Water the ground thoroughly.