Effect of Long-Term Paddy-Upland Yearly Rotations on Rice (Oryza sativa) Yield, Soil Properties, and Bacteria Community Diversity

Table 3

Soil physical properties in 0–20 cm depth.

Rotation	^aSand	Slit	Clay	MWD	Bulk density
	(g/kg)	(g/kg)	(g/kg)	(mm)	(g/cm^3)
CK	40.9b	650.9	300.0b	0.07b	1.20b
RC	89.4a	574.5	336.1b	0.11a	1.39a
RR	51.4b	559.2	389.4a	0.08b	1.26ab
RP	76.2a	586.2	337.5b	0.10a	1.21b
ROM	54.6b	551.5	393.9a	0.08b	1.21b
ROF	42.6b	531.4	426.0a	0.06b	1.35a

^aSand 2–0.05 mm, silt 0.05–0.002 mm, clay < 0.002 mm.
Means on the same column and for the same sampling time followed by the same letter (or none) are not significantly different at 𝑃<0.05 by Tukey Test. Abbreviations: CK: rice-fallow phase; RR: rice-ryegrass; RP: rice-potato, with rice straw as mulch; RC: rice-Chinese milk vetch; ROM: rice-oilseed rape with burned straw return after harvest; ROF: rice-oilseed rape with fresh straw return as mulch at flowering.