I think that you are probably dealing with a very technical definition of "ready biodegradability" in the context of biodegradation as described below. Ready in this sense in general does most probably mean readily or easily.


"Biodegradation is a major process for
removing chemicals from aquatic and
terrestrial environments. Laboratory
tests can be used to indicate the
propensity of a compound to biodegrade.
The Organisation for Economic
Co-Operation and Development
(OECD)1 has divided biodegradation
testing into three distinct categories
as follows:

Ready Biodegradability
Tests of “Ready Biodegradability” are
stringent tests designed to provide
limited opportunity for biodegradation
and acclimatization of microorganisms
to a chemical to occur. Chemicals
which pass OECD Ready Biodegradability
criteria in these tests are not
expected to persist in the environment.
Results of biodegradability tests conducted
within Dow laboratories, using
procedures similar to OECD Ready
Biodegradability tests1 are shown in
Table 1."
http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_0044/...