You need to total the product cost, freight, spreading cost and then the cost of working the product into the soil to get a benefit so 3 out of the 4 mentioned is all to do with fuel cost and also labour, based on past research this is where liquids come into their own because they are very effective at lower application rates so, let's look at what a 24 tonne tri-axle will cover.

Bulk: 24 tonne applied at 5 tone per hectare covers 4.8 hectares.

Gyp-Flo, PH PLUS and Dolomite Plus: 18 x 800litre (total 14,400 litres) applied at 50 litres per hectare covers 288 hectares.

This is a ratio of 50 hectares to 1 hectare.

So at the end of the day it is best to do your sums and look at the total cost.