Second inspection rules out midweek clash.
Tonight's game against Shrewsbury Town has been postponed after a second pitch inspection.
A local referee came to look at the playing surface at the Weston Homes Community Stadium on Tuesday morning and, after consultation with the Football League office, decided a further inspection was necessary later in the day.
Match referee Mr Sutton took a look at the surface and decided that the U's home surface was unplayable.
"The whole process started yesterday morning when the club said they had concerns with the condition of the pitch and upcoming weather forecast.
He told the official website: "A lot of thought has gone into this decision, it is not just a case of turning up and calling it off.
"At the time, it was a chance it could improve and the groundstaff had worked hard and done a sterling job to try and improve it over the past 48 hours.
"A local referee came in this morning to take a look and he then passed on his observations to the Football League.
"I have had a look around and spoken to both managers, and whilst they were important in making my judgement, it was my call.
"We tried to give it a chance, and I subsequently came in to take a look.
"There are areas where it's 'bottomless ground' and my thoughts were of players' safety. We didn't want to gamble someone's safety on those areas.
"What's more, if we got any rain, that would have wiped us out completely."
At this early stage, no new date has been planned for the rearranged fixture.
The match is one of six postponed around the country so far, with the inclement weather affecting games.