Table 2. Effect of different tillage treatments on soil organic carbon, available phosphorus, available nitrogen and bulk density.

Soil properties	period	depth	Year	tillage
Soil organic carbon (g kg−1)	before sowing	0–20 cm	2014/15	NT	8.57 a
						DT	8.71 a
					2015/16	NT	8.82 a
						DT	8.91 a
					2016/17	NT	8.72 a
			DT	8.75 a
Available phosphorus (mg kg−1)	before sowing	0–20 cm	2014/15	NT	11.26 b
						DT	12.83 a
					2015/16	NT	9.94 b
						DT	13.06 a
					2016/17	NT	13.01 a
			DT	13.56 a
Available nitrogen (mg kg−1)	before sowing	0–20 cm	2014/15	NT	31.00 b
						DT	36.25 a
					2015/16	NT	46.03 b
						DT	66.03 a
					2016/17	NT	30.99 b
			DT	36.41 a
Bulk density (g/cm3)	before sowing	0–20 cm	2015/16	NT	1.31 a
							DT	1.23 b
					20–40 cm		NT	1.49 a
						DT	1.20 b
		harvest		0–20 cm		NT	1.40 a
							DT	1.30 b
					20–40 cm		NT	1.68 a
				DT	1.43 b

Notes.

DT

deep tillage

NT

no-tillage

Different letters in the column indicate significant difference among treatments at p < 0.05 by the LSD test.