TABLE 3.

Coefficient of variation (CV) for chemical, physical, and biological variables in the 0–5, 5–10, and 10–20 cm soil layers.

Variable	Plow	Reduced tillage	No-till	p-value
pH	0.6a	1.5b	1.5b	<0.01
EC	6.2a	18.1b	25.9c	<0.001
Bulk Density	7.3a	11.0b	9.8(b)	0.03
Nmin	14.0a	27.1b	37.6c	<0.001
Pavailable	2.4a	20.4b	34.1c	<0.001
SOC	0.8a	9.6b	14.3c	<0.001
C/N	2.5	3.9	3.1	0.57
POM-C	4.4a	25.3b	31.1c	<0.001
Cmic	6.0a	26.2b	30.7c	<0.001

The different letters refer to statistically significant differences within each comparison; p ≤ 0.05, (p ≤ 0.10).