A farmer said he will have to pay about £1,500 to dispose of about 30 tonnes of processed waste that has been fly-tipped on his land.
Peter Sharpley farms 1,200 acres of land between Water Newton, near Peterborough, and Stamford, in Lincolnshire, with most of it running beside the A1.
He said he had put heavy farm equipment across entrances to fields in an effort to prevent it from happening again.
"From our point of view, we've just got to barricade ourselves in, that's all we can do," Sharpley said.
Sharpley said he had the worst harvest in 50 years due to extreme weather patterns, and the fly-tipping incident was just another worry.
"This year has been our worst harvest since 1976, and we will make a loss this year on the arable side... and to have another cost like this lumped on us is not very handy unfortunately," he said.
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