CHEMLAWN <CHEM> SEEKS BIDS BY MARCH 18 ChemLawn corp said it has asked potential purchasers of the company to submit their proposals by 1700 EST on March 18. ChemLawn said if Waste Management Inc <WMX> intends to participate in the bidding process, it will have to submit a confidentiality agreement to Chemlawn financial advisor Smith Barney, Harris Upham and Co Inc. Waste Management has a 27 dlr per share tender offer for Chemlawn underway that Chemlawn has already rejected as inadequate. Chemlawn has already said it is holding talks with various parties on the sale of the company and said it has informed all potential purchasers that they mnust sign confidentiality agreemnents to receive confidential information on Chemlawn. ChemLawn said if Waste Management were to sign such an agreement, ChemLawn would supply it with the same information being supplied to other potential purchasers. But it said it will not make an exception for Waste Management which would give that company an advantage in the bidding process.