TABLE 6.

Ability of cultures to grow and time until visible colony appearance on different media for pure cultures of soil bacteria from commonly isolated and rarely isolated groups^a

Medium	% of cultures with ability to grow		Mean time to colony appearance (days)		Statistical significance (P value in t test)b
	Members of commonly isolated groups	Members of rarely isolated groups	Members of commonly isolated groups	Members of rarely isolated groups
0.1× TSA	97	33	5	23	0.03
WSA	100	44	15	43	0.02
CSEA	91	50	10	35	5 × 10−4
DNBA	100	100	7	30	4 × 10−5
VGluA	100	94	4	19	1 × 10−4

^aThirty-two isolates from commonly isolated groups and 18 isolates from rarely isolated groups were tested.

^bStatistical significance was determined for the differences between times to colony appearance.