You cannot use a measure of area to calculate its weight.
You need a third dimension to first calculate the volume and then convert to weight by knowing the density of the soil.
If you have a depth of one meter there is one cubic meter and soil has a density of about 1,3 so your cubic meter of soil weighs 1,3 tonnes.
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Divide by 9.81
None. "square meter" is a unit of volume and "ton" is a unit of mass.
A tonne is a unit of mass; a square meter is a unit of area. You only "convert" units of the same kind.
3600 / 12 = 300 tons
1.69 tons