Farm machinery is not a huge part of agricultural energy use, and agriculture is not a huge contributor overall consumption, but energy's share in food production costs are high.

Petroleum use by industry sector: https://www.eia.gov/energyexplained/index.php?page=us_energy...

How energy is used in agriculture (Sweden): http://www.serina-ahlgren.com/p/research_26.html

How agriculture energy use contributes to the atmosphere: https://www.globalagriculture.org/report-topics/climate-and-...

(I am not an expert in this field.)

Edit: an adjective form