Typically most of the energy subsidies in modern agriculture are in the form of

The given statement can be completed as-

Typically most of the energy subsidies in modern agriculture are in the form of burning of fossil fuels.

Use of direct energy in agriculture is mainly dependent upon petroleum based fuels that helps to operate the machinery for the preparation of agricultural land, planting and harvesting crops, application of fertilizers and other purposes.

Thus, burning of fossil fuels is the right answer.