Effect of Long-Term Paddy-Upland Yearly Rotations on Rice (Oryza sativa) Yield, Soil Properties, and Bacteria Community Diversity
Table 4
Soil chemical properties in 0–10 cm depth.
Depth
Rotation
pH
Total N
Total P
Available K
CEC
(1 : 2.5 )
(g/kg)
(g/kg)
(g/kg)
(Cmol/kg)
0–10 cm
CK
5.78a
2.46b
0.53b
0.25b
10.73b
RC
5.48b
2.92a
0.59b
0.28ab
12.23a
ROF
5.21c
2.82a
0.70a
0.30a
10.97b
ROM
5.64a
2.56b
0.59b
0.33a
11.92a
RP
5.15c
2.96a
0.72a
0.31a
10.80b
RR
5.40b
2.67b
0.67a
0.24b
11.23b
10–20 cm
CK
5.86b
2.36b
0.47
0.22b
10.26c
RC
5.82b
2.61ab
0.49
0.23b
13.50a
ROF
6.00a
2.52b
0.54
0.23b
11.41b
ROM
5.96a
2.41b
0.48
0.30a
11.43b
RP
5.84b
2.70a
0.53
0.25b
11.01b
RR
5.89b
2.48b
0.54
0.21b
10.34c
Comparison of depth
0–10 cm
5.44b
2.73a
0.63a
0.29
11.31
10–20 cm
5.90a
2.51b
0.51b
0.24
11.33
ANOVA
Rotation
**
**
**
**
**
Depth
**
**
**
ns
ns
*
*
*
**
**
Means on the same column and for the same sampling time followed by the same letter (or none) are not significantly different at by Tukey Test. ns: not significant; ; . 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.
