X0101 EFFECT 33 LIVE 2007-07-31 0000899681-07-000532 485APOS 0000740123 DREYFUS TAX EXEMPT CASH MANAGEMENT FUNDS 002-89275 S000018306 Dreyfus California AMT Tax-Free Cash Management C000050495 Institutional Shares S000018306 Dreyfus California AMT Tax-Free Cash Management C000050496 Administrative Shares S000018306 Dreyfus California AMT Tax-Free Cash Management C000050497 Investor Shares S000018306 Dreyfus California AMT Tax-Free Cash Management C000050498 Participant Shares