The local authority bought the T5.105 four-wheel-drive machines for grounds maintenance after being impressed with an original four machines bought three years ago.
District parks officer Melvyn Riley said the council’s existing tractors had "worked very well in terms of operating costs and reliability.
"We have purchased a further four tractors to standardise our fleet, of which the majority will now be made up of New Holland tractors as we moved away from a mixed fleet of McCormick CX75 and Massey Ferguson 4235 fleets.
"The tractors are very efficient and well balanced when the gang mowing units are fitted and their performance exceeds our previous units’ output."
The department is currently operating two New Holland tractors with front loading buckets. One is also used to tow a trailed rotary grass cutting unit which gives us additional flexibility to grass cutting operation.
Riley added: "We are looking forward to operating our New Holland tractor fleet over the next few years which is reliable, efficient and cost-effective in terms of repairs and maintenance, whilst giving us the flexibility to meet any changes we may have to make to future grass maintenance regimes."
The tractors were bought through New Holland dealership Golf & Turf Machinery, a trading division of Platts Harris based in Tuxford. The tractors are fitted with Ransome 5/7 Gang Mowing units to establish seven mowing routes across the city.