There is no equivalence.
A kilogram is a measure of mass. A yard is a measure of length. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you knew the density of the soil, you could convert the mass to volume. But even that is not enough. You would still need to know the depth of cover required.
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NONE.Yards measure distance and kilograms measure weight.
soil weighs 1600 kg/ cubic meter
It depends on what kind of rock it is.
None. A square foot is a measure of area and so has no volume. Since there is no volume, there can be no mass.
1/1000 kg or 0.001 kg