The legal speed limit to drive a tractor has increased to 40km/h (24.8mph) from this week.
Ministers said Monday's move will save money and time.
The Government's new tractor regulations will also see tractor/trailer combination weight ceilings rise to 31 tonnes from 24.39 tonnes.
Farming groups have welcomed the plans. Previously, tractor drivers going over 20mph risked getting fined, banned and penalty points for breaking the speed limit.
Claire Perry, the Transport Minister, said faster journeys will mean fewer journeys for tractor drivers, minimising accident risks.
The weight changes will enable farm workers to optimise the level of goods they ferry on each trip.
Ms Perry believes the changes will save farming communities nearly £60 million a year. She called this group the real "life-blood" of countryside settlements.
Further tractor speed and weight reforms are being considered before next year's harvest.
Copyright Press Association 2015