Long and Midterm Effect of Conservation Agriculture on Soil Properties in Dry Areas of Morocco

Table 4

Tillage treatments effect on total nitrogen (mean ± standard deviation) and on C/N ratio.

Field	Soil depth (cm)	Total nitrogen (g·Kg^−1)		C/N
		NT	CT	NT	CT
Site I	0–10			10.75	8.28
Site II	0–2.5	1.22 ± 0.01a	0.92 ± 0.01b	9.02	8.31
	2.5–5	1.08 ± 0.01a	0.94 ± 0.01b	8.23	6.63
	5–10	1.10 ± 0.01a	0.94 ± 0.01b	8.28	6.25
	10–20	1.20 ± 0.01a	0.94 ± 0.01b	6.15	5.87
	20–30	1.04 ± 0.01a	0.98 ± 0.00a	6.98	6.67
	30–40	0.94 ± 0.01a	0.90 ± 0.01a	8.24	6.31
	40–60	0.88 ± 0.01a	0.98 ± 0.01a	7.39	5.61
	60–80	0.88 ± 0.01a	0.88 ± 0.01a	6.80	8.64

the same row, the means followed by the same letter were not significantly different at between tillage treatments.