Perhaps it was the water, or maybe something let into the soil.

The time has come to think about putting something back into the soil.

This one doesn't spread, so needs to go back into the soil.

He took a step and felt his feet sinking into the soil.

While he is asleep leaves fall on him and turn into soil.

The risk of disease being carried down into the soil could be extremely serious.

It should be turned into the soil when 8 to 10 inches tall.

The operator records how much water goes into the soil for a given time period.

Five months later, they ground their boots into Iraqi soil.

Do you know any plants that put nitrogen back into the soil?