Influence of NaCl-Induced Salinity and Cd Toxicity on Respiration Activity and Cd Availability to Barley Plants in Farmyard Manure-Amended Soil
Table 4
Treatment effects on CO2-C evolution rate (mg C g−1 soil day−1) during incubation time.
Cd levels
NaCl levels
Incubation time
Day 1
Day 3
Day 7
Day 14
Day 21
Day 28
Without FYM
0.5 ppm Cd
S0
0.0276
0.0140
0.0065
0.0035
0.0033
0.0033
0.0018
S1
0.0263
0.0134
0.0062
0.0035
0.0033
0.0034
0.0036
S2
0.0222
0.0109
0.0056
0.0029
0.0031
0.0031
0.0023
S3
0.0164
0.0090
0.0049
0.0026
0.0025
0.0027
0.0024
LSDS
0.0057
0.0025
0.0013
0.0016
0.0013
0.0017
—
24 ppm Cd
S0
0.0197
0.0105
0.0051
0.0029
0.0025
0.0025
0.0016
S1
0.0181
0.0097
0.0046
0.0028
0.0023
0.0024
0.0020
S2
0.0094
0.0055
0.0028
0.0017
0.0015
0.0015
0.0040
S3
0.0069
0.0034
0.0017
0.0010
0.0009
0.0009
0.0013
LSDS
0.0026
0.0044
0.0025
0.0011
0.0016
0.0008
—
LSDCdS
0.0040
0.0033
0.0018
0.0013
0.0013
0.0012
Cd levels
NaCl levels
With FYM
0.5 ppm Cd
S0
0.1145
0.0653
0.0377
0.0226
0.0196
0.0177
0.0034
S1
0.1125
0.0643
0.0373
0.0229
0.0197
0.0180
0.0025
S2
0.1108
0.0631
0.0361
0.0225
0.0195
0.0178
0.0030
S3
0.1013
0.0569
0.0324
0.0196
0.0175
0.0157
0.0027
LSDS
0.0055
0.0046
0.0018
0.0012
0.0006
0.0009
—
24 ppm Cd
S0
0.1154
0.0658
0.0373
0.0221
0.0194
0.0175
0.0029
S1
0.1137
0.0647
0.0367
0.0218
0.0193
0.0177
0.0021
S2
0.0942
0.0544
0.0318
0.0191
0.0171
0.0153
0.0036
S3
0.0769
0.0457
0.0275
0.0167
0.0144
0.0130
0.0036
LSDS
0.0071
0.0040
0.0024
0.0010
0.0009
0.0011
LSDCdS
0.0058
0.0039
0.0019
0.0010
0.0007
0.0009
LSDCdSF
0.0047
0.0035
0.0018
0.0011
0.0010
0.0010
(P < 0.05): time effect; LSDS (P < 0.05): salt effect; LSDCdS (P < 0.05): Cd salt effect; LSDCdSF (P < 0.05) = Cd salt FYM effect, S0 (without NaCl), S1 (30 mM NaCl), S2 (60 mM NaCl), and S3 (120 mM NaCl); NS = not significant.