More than 500 people have criticised plans to turn farming land into recreational grounds.
Protesters fear if the land south of Chyngton Way, Seaford, is used for playing fields it is only a matter of time before something more permanent is developed.
John Foxley, of Chyngton Way, voiced his concerns at a public inquiry held by Lewes District Council into the proposed amendments to Lewes District Local Plan.
He told the inquiry he had sent 550 letters to households in Chyngton Way and nearby areas.
A total 546 people had voiced concerns about the proposals, which include using the fields as informal football pitches with the possible erection of goal posts and toilet facilities.
Mr Foxley said the site formed part of the downland landscape and should be included in the area of outstanding natural beauty either side of the land.
The inquiry into the proposals is expected to last until next Friday.
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