Soil compaction - Soil Essentials: Managing Your Farm's Primary Asset - page 128

Applying gypsum
The cost of gypsum varies depending on its source and the purity of the product.
A working figure is around $50 per tonne ex works. Transport costs will add
significantly to the cost at the farm gate, and will vary with transport distance.
Contract spreading costs will be around $10 to $15 per tonne.
The total cost of treatment is quite high, but benefits of increased productivity
will last a number of seasons.
Note . It is strongly advisable to obtain a chemical analysis of the gypsum to be
used prior to application to check that it does not contain excessive sodium (Na),
which could negate the major benefit of applying the gypsum.
What happens if compacted soils are not repaired?
A loss of potential farm productivity can be expected, and if soil compaction is
severe, soil loss due to erosion and hence a decline in the farm's main asset, the
soil, is inevitable.