Planning experts are attacking the Government proposals to draw up register of contaminated land.They fear the scheme will lead to widespread blight with developers avoiding land listed in the registers. And homeowners will see the value of their property plummet is their addresses appear.Christopher Jonas, president of the Royal Institution of Chartered Surveyors, recommends a different approach.'The time to tackle contamination is when the land is being redeveloped or is subject to a change of use,' he said. 'This should be done by requiring planning applications for significant redevelopment or scheduled change of use to be accompanied by a land quality statement.'Details would then have to be included as to how the land would be decontaminated.