TABLE 3.

Mean DNA yields from replicate plots of tilled, native, and successional soils

Treatment	Mean DNA yield (μg of g soil−1)a ± SD
	1994	1995
CT	2.9 ± 0.1a	12.8 ± 3.8b
HTS	NDb	13.6 ± 2.9b
NTS	13.0 ± 2.8b	15.7 ± 3.7b

^aValues followed by different letters are significantly different (P < 0.05) between treatments. DNA concentrations were calculated from the spectrophotometric A₂₆₀. Values include Standard deviations based on triplicate subsamples from two replicate plots. 

^bND, not determined.