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Subsidence causes all sorts of problems in local landscapes. It can be the culprit behind uneven spots in lawns, exposed tree roots, low spots that stay damp and drainage issues.To solve those problems and others, we apply fill to our yards.When filling around existing trees, limit the fill to no more than 2 inches if it will cover a large part of the roots. (Excessive fill will suffocate roots and damage or kill trees.)For filling in more limited areas, such as individual depressions or low spots, more fill can be applied.Also, limit fill to 2 inches when applying over lawn areas. Apply fill to lawns when the grass is in active growth from April to September, and mow just before spreading the fill.
What to use
Filling is best done with the sandy alluvial soil deposited in our area by the Mississippi River. Soil that is deposited in the river bed and dredged or pumped out to keep the river open to large ships is called pumped sand or sugar sand.Soil obtained from the area between the river and the levee is called batture sand.
Pumped and batture sand are also called river sand. Alluvial soil obtained from the Bonnie Carrie spillway is called spillway sand.This lack of organic matter is what makes river sand light in color. These soils also are low in nitrogen and have a slightly alkaline pH.In addition to fill, these materials can be used to create garden beds. If you add generous amounts of organic matter and a light fertilizer application, they make excellent garden soils for improving beds or filling raised beds.
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