Nine fire crews battled a large field blaze near Long Stratton on Tuesday afternoon.
Crews were called at about 2pm to a corn field just off the A140 Ipswich Road and extinguished the fire.
Crews seemed to have the fire under control by about 4pm.
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Large plumes of smoke and flames could be seen from the road, which was affected by slow-moving traffic.
Crews used hose reel jets and hand appliances to battle the fire.
One bystander described the blaze as "massive" leaving the field completely scolded.
Rob Tyson, 44, was travelling back on the A140 to his home in Spixworth when he saw the fire.
He said: "It was phenomenal to see it spread at such a speed. We called the fire brigade at about 1.50pm and within minutes it had spread across the field.
"You would not want to be in front of it.
"Some farmers came along and were ploughing the field to stop it spreading. One of them said they thought the fire was caused by a combine harvester catching alight.
"We left after 50 minutes and by then it seemed to have been brought under control.
"The worse bit was standing there knowing there was nothing we could do."
It comes after a parade of shops in the town were left damaged in a "devastating" blaze.
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