Salt Stress Amelioration in Maize Plants through Phosphogypsum Application and Bacterial Inoculation
Abstract
:1. Introduction
2. Results
2.1. Physiological Characteristics in Maize Leaves
2.2. Antioxidant Enzyme Activities
2.3. Microbial Communities
2.4. Soil Enzyme Activities
2.5. Macro-Elements, Na+ and K+/Na+ % in Maize Leaves
2.6. Micro-Elements in Maize Leaves
2.7. Soil Physicochemical Characteristics
2.8. Maize Productivity
3. Discussion
3.1. Physiological Characteristics in Maize Leaves
3.2. Antioxidant Enzyme Activities
3.3. Microbial Communities and Soil Enzyme Activities
3.4. The Percentages of Macro-Elements, Na+, and K+/Na+ in Maize Leaves
3.5. Micro-Elements in Maize Leaves
3.6. Soil Physicochemical Characteristics
3.7. Maize Productivity
4. Materials and Methods
4.1. Phosphogypsum (PG)
4.2. Microorganisms and Culture Conditions
4.3. Experimental Setup and Treatments
4.4. Measurements and Analyses
4.4.1. Physiological Characteristics in Maize Leaves
4.4.2. Assay of Antioxidant Enzyme Activities
4.4.3. Microbial Community Estimations
4.4.4. Soil Enzyme Activities
4.4.5. Determinations of Macro and Micro-Nutrients in Maize Leaves
4.4.6. Soil Chemical Characteristics
4.4.7. Maize Productivity
4.5. Statistical Analysis
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Year | Phosphogypsum Rates (PG) | Inoculation (I) | Total Chlorophyll (mg g−1 FW) | Carotenoids (μg g−1 FW) | Proline (µmol g−1 FW) |
---|---|---|---|---|---|
2019 | PG1 | T1 | 1.00 ± 0.04 j | 0.297 ± 0.01 l | 9.94 ± 0.15 a |
T2 | 1.16 ± 0.05 i | 0.377 ± 0.01 j | 9.60 ± 0.20 b | ||
T3 | 1.29 ± 0.02 h | 0.357 ± 0.01 jk | 8.79 ± 0.20 cd | ||
T4 | 1.25 ± 0.03 h | 0.330 ± 0.02 kl | 8.97 ± 0.20 c | ||
PG2 | T1 | 1.74 ± 0.07 g | 0.540 ± 0.07 i | 8.77 ± 0.14 cd | |
T2 | 1.91 ± 0.02 f | 0.710 ± 0.02 g | 8.30 ± 0.20 e | ||
T3 | 2.16 ± 0.04 d | 0.730 ± 0.03 fg | 7.49 ± 0.20 ghi | ||
T4 | 1.90 ± 0.03 f | 0.693 ± 0.04 gh | 7.68 ± 0.20 g | ||
PG3 | T1 | 1.85 ± 0.03 f | 0.653 ± 0.03 h | 8.59 ± 0.05 d | |
T2 | 2.06 ± 0.04 e | 0.867 ± 0.04 d | 7.53 ± 0.25 gh | ||
T3 | 2.47 ± 0.05 b | 0.883 ± 0.03 cd | 6.16 ± 0.08 k | ||
T4 | 2.07 ± 0.04 e | 0.820 ± 0.02 e | 7.27 ± 0.05 ij | ||
PG4 | T1 | 2.21 ± 0.03 d | 0.767 ± 0.02 f | 8.13 ± 0.10 ef | |
T2 | 2.31 ± 0.03 c | 0.927 ± 0.02 b | 8.08 ± 0.05 f | ||
T3 | 2.73 ± 0.05 a | 0.970 ± 0.01 a | 7.21 ± 0.25 j | ||
T4 | 2.17 ± 0.03 d | 0.923 ± 0.01 bc | 7.45 ± 0.05 hi | ||
2020 | PG1 | T1 | 1.04 ± 0.04 k | 0.32 ± 0.02 k | 9.95 ± 0.03 a |
T2 | 1.20 ± 0.05 j | 0.40 ± 0.03 i | 9.67 ± 0.11 b | ||
T3 | 1.33 ± 0.03 i | 0.38 ± 0.01 ij | 8.84 ± 0.08 c | ||
T4 | 1.29 ± 0.02 i | 0.35 ± 0.01 jk | 8.91 ± 0.10 c | ||
PG2 | T1 | 1.80 ± 0.07 h | 0.57 ± 0.06 h | 8.84 ± 0.07 c | |
T2 | 1.92 ± 0.02 g | 0.73 ± 0.02 f | 8.19 ± 0.16 e | ||
T3 | 2.19 ± 0.04 e | 0.75 ± 0.03 f | 7.51 ± 0.14 g | ||
T4 | 1.92 ± 0.02 g | 0.72 ± 0.04 f | 7.88 ± 0.04 f | ||
PG3 | T1 | 1.89 ± 0.04 g | 0.67 ± 0.03 g | 8.66 ± 0.05 d | |
T2 | 2.11 ± 0.04 f | 0.89 ± 0.06 c | 7.52 ± 0.21 g | ||
T3 | 2.50 ± 0.05 b | 0.90 ± 0.04 c | 6.17 ± 0.05 j | ||
T4 | 2.10 ± 0.05 f | 0.85 ± 0.03 d | 7.25 ± 0.08 h | ||
PG4 | T1 | 2.26 ± 0.04 d | 0.79 ± 0.02 e | 8.10 ± 0.05 e | |
T2 | 2.34 ± 0.04 c | 0.95 ± 0.02 b | 8.08 ± 0.04 e | ||
T3 | 2.76 ± 0.06 a | 1.00 ± 0.01 a | 6.98 ± 0.11 i | ||
T4 | 2.21 ± 0.02 de | 0.95 ± 0.02 b | 7.39 ± 0.05 gh | ||
F-test | |||||
Phosphogypsum rates (PG) | *** | *** | *** | ||
Inoculation (I) | *** | *** | *** | ||
Interaction (PG × I) | *** | *** | *** |
Year | Phosphogypsum Rates (PG) | Inoculation (I) | DHA (mg TPF g−1 Soil d−1) | Urease (NH4+ − N g−1 Soil Day−1) |
---|---|---|---|---|
2019 | PG1 | T1 | 50.00 ± 4.58 l | 45.33 ± 1.53 j |
T2 | 74.00 ± 2.65 k | 58.33 ± 3.51 i | ||
T3 | 80.00 ± 3.00 jk | 89.00 ± 3.61 e | ||
T4 | 84.00 ± 4.00 j | 71.33 ± 3.79 h | ||
PG2 | T1 | 104.67 ± 5.51 i | 57.00 ± 2.65 i | |
T2 | 147.33 ± 5.69 f | 71.00 ± 2.00 h | ||
T3 | 184.33 ± 4.16 c | 97.00 ± 2.00 d | ||
T4 | 169.33 ± 5.51 d | 82.67 ± 3.21 f | ||
PG3 | T1 | 122.33 ± 5.51 h | 68.67 ± 2.52 h | |
T2 | 158.33 ± 4.04 e | 77.67 ± 3.51 g | ||
T3 | 201.33 ± 3.51 b | 124.33 ± 3.51 b | ||
T4 | 176.00 ± 3.61 d | 92.67 ± 3.51 e | ||
PG4 | T1 | 134.33 ± 4.16 g | 76.33 ± 2.08 g | |
T2 | 172.00 ± 4.58 d | 89.67 ± 3.06 e | ||
T3 | 216.00 ± 5.57 a | 138.00 ± 4.58 a | ||
T4 | 190.00 ± 3.61 c | 106.00 ± 4.36 c | ||
2020 | PG1 | T1 | 51.67 ± 3.51 n | 46.67 ± 2.08 l |
T2 | 77.67 ± 0.58 m | 61.33 ± 1.53 k | ||
T3 | 81.67 ± 3.21 m | 91.00 ± 3.46 f | ||
T4 | 87.00 ± 2.65 l | 76.00 ± 3.61 i | ||
PG2 | T1 | 111.00 ± 2.65 k | 60.33 ± 4.73 k | |
T2 | 151.33 ± 3.51 h | 72.33 ± 3.21 j | ||
T3 | 187.00 ± 3.61 d | 99.67 ± 2.08 d | ||
T4 | 172.33 ± 5.69 f | 82.67 ± 1.15 g | ||
PG3 | T1 | 129.67 ± 1.53 j | 70.33 ± 3.51 j | |
T2 | 162.00 ± 3.61 g | 80.00 ± 4.58 gh | ||
T3 | 209.67 ± 1.15 b | 130.00 ± 3.61 b | ||
T4 | 179.00 ± 4.00 e | 95.00 ± 4.00 e | ||
PG4 | T1 | 138.33 ± 4.04 i | 78.67 ± 1.53 hi | |
T2 | 175.33 ± 3.79 ef | 91.67 ± 3.51 ef | ||
T3 | 222.67 ± 5.51 a | 143.33 ± 4.51 a | ||
T4 | 195.00 ± 6.08 c | 112.67 ± 5.69 c | ||
F-test | Phosphogypsum rates (PG) | *** | *** | |
Inoculation (I) | *** | *** | ||
Interaction (PG × I) | *** | *** |
Year | Phosphogypsum Rates (PG) | Inoculation (I) | N | P | K | Na | K/Na |
---|---|---|---|---|---|---|---|
2019 | PG1 | T1 | 1.03 ± 0.03 l | 0.24 ± 0.02 l | 0.98 ± 0.03 k | 2.18 ± 0.04 a | 0.44 ± 0.02 m |
T2 | 1.07 ± 0.04 l | 0.26 ± 0.02 k | 1.00 ± 0.02 k | 2.08 ± 0.04 b | 0.48 ± 0.02 lm | ||
T3 | 1.34 ± 0.02 h | 0.37 ± 0.02 i | 1.33 ± 0.03 ef | 1.43 ± 0.02 j | 0.93 ± 0.01 e | ||
T4 | 1.14 ± 0.03 k | 0.34 ± 0.02 j | 1.25 ± 0.01 g | 1.71 ± 0.03 fg | 0.73 ± 0.02 g | ||
PG2 | T1 | 1.18 ± 0.03 j | 0.34 ± 0.02 j | 1.05 ± 0.04 j | 1.95 ± 0.02 c | 0.53 ± 0.02 kl | |
T2 | 1.25 ± 0.03 i | 0.48 ± 0.04 g | 1.16 ± 0.03 hi | 1.88 ± 0.03 d | 0.61 ± 0.02 ij | ||
T3 | 1.71 ± 0.03 e | 0.65 ± 0.02 c | 1.60 ± 0.04 c | 1.20 ± 0.02 k | 1.33 ± 0.04 c | ||
T4 | 1.41 ± 0.03 g | 0.52 ± 0.03 f | 1.36 ± 0.03 e | 1.59 ± 0.04 h | 0.85 ± 0.03 f | ||
PG3 | T1 | 1.33 ± 0.03 h | 0.43 ± 0.02 h | 1.07 ± 0.02 j | 1.83 ± 0.03 e | 0.58 ± 0.01 jk | |
T2 | 1.35 ± 0.02 h | 0.54 ± 0.02 f | 1.19 ± 0.02 h | 1.68 ± 0.05 g | 0.70 ± 0.01 gh | ||
T3 | 1.76 ± 0.03 d | 0.68 ± 0.02 b | 1.87 ± 0.02 b | 1.05 ± 0.04 l | 1.78 ± 0.09 b | ||
T4 | 1.54 ± 0.03 f | 0.58 ± 0.01 e | 1.36 ± 0.03 e | 1.49 ± 0.02 i | 0.91 ± 0.01 ef | ||
PG4 | T1 | 1.67 ± 0.03 e | 0.49 ± 0.02 g | 1.13 ± 0.03 i | 1.73 ± 0.04 f | 0.65 ± 0.03 hi | |
T2 | 1.92 ± 0.03 c | 0.62 ± 0.02 d | 1.30 ± 0.03 f | 1.75 ± 0.02 f | 0.74 ± 0.02 g | ||
T3 | 2.11 ± 0.04 a | 0.76 ± 0.03 a | 1.97 ± 0.02 a | 0.85 ± 0.03 m | 2.31 ± 0.06 a | ||
T4 | 2.04 ± 0.05 b | 0.67 ± 0.02 bc | 1.45 ± 0.04 d | 1.39 ± 0.03 j | 1.04 ± 0.04 d | ||
2020 | PG1 | T1 | 1.05 ± 0.02 k | 0.28 ± 0.03 l | 1.01 ± 0.03 k | 2.16 ± 0.02 a | 0.45 ± 0.01 l |
T2 | 1.07 ± 0.02 k | 0.30 ± 0.02 l | 1.04 ± 0.03 l | 2.01 ± 0.07 b | 0.50 ± 0.02 kl | ||
T3 | 1.40 ± 0.02 h | 0.40 ± 0.02 j | 1.36 ± 0.01 l | 1.39 ± 0.02 i | 0.97 ± 0.00 e | ||
T4 | 1.20 ± 0.02 j | 0.36 ± 0.03 k | 1.32 ± 0.02 efg | 1.62 ± 0.02 g | 0.81 ± 0.03 g | ||
PG2 | T1 | 1.22 ± 0.02 j | 0.39 ± 0.01 jk | 1.06 ± 0.03 g | 1.91 ± 0.03 c | 0.55 ± 0.03 k | |
T2 | 1.30 ± 0.03 i | 0.49 ± 0.01 h | 1.19 ± 0.05 kl | 1.81 ± 0.02 d | 0.65 ± 0.01 ij | ||
T3 | 1.75 ± 0.02 d | 0.69 ± 0.02 c | 1.64 ± 0.03 hi | 1.18 ± 0.02 k | 1.38 ± 0.08 c | ||
T4 | 1.49 ± 0.06 g | 0.57 ± 0.02 f | 1.40 ± 0.08 e | 1.53 ± 0.02 h | 0.91 ± 0.02 f | ||
PG3 | T1 | 1.31 ± 0.05 i | 0.46 ± 0.02 i | 1.10 ± 0.01 jk | 1.79 ± 0.03 d | 0.61 ± 0.01 j | |
T2 | 1.39 ± 0.01 h | 0.56 ± 0.03 f | 1.23 ± 0.04 h | 1.65 ± 0.06 fg | 0.74 ± 0.02 h | ||
T3 | 1.81 ± 0.03 c | 0.72 ± 0.02 b | 1.91 ± 0.03 b | 1.00 ± 0.02 l | 1.91 ± 0.04 b | ||
T4 | 1.63 ± 0.02 f | 0.62 ± 0.02 e | 1.39 ± 0.02 ef | 1.43 ± 0.01 i | 0.97 ± 0.01 e | ||
PG4 | T1 | 1.69 ± 0.03 e | 0.53 ± 0.02 g | 1.16 ± 0.02 ij | 1.68 ± 0.02 ef | 0.69 ± 0.00 i | |
T2 | 2.03 ± 0.05 b | 0.66 ± 0.01 d | 1.34 ± 0.03 fg | 1.70 ± 0.02 e | 0.78 ± 0.01 gh | ||
T3 | 2.19 ± 0.03 a | 0.80 ± 0.03 a | 1.99 ± 0.02 a | 0.80 ± 0.01 m | 2.48 ± 0.02 a | ||
T4 | 2.15 ± 0.04 a | 0.69 ± 0.03 c | 1.48 ± 0.04 d | 1.35 ± 0.03 j | 1.09 ± 0.02 d | ||
F-test | Phosphogypsum rates (PG) | *** | *** | *** | *** | *** | |
Inoculation (I) | *** | *** | *** | *** | *** | ||
Interaction (PG × I) | *** | *** | *** | *** | *** |
Year | Phosphogypsum Rates (PG) | Inoculation (I) | Zn | Mn | Fe | Cu |
---|---|---|---|---|---|---|
2019 | PG1 | T1 | 23.73 ± 0.32 m | 23.55 ± 0.38 n | 55.04 ± 0.22 j | 7.17 ± 0.06 h |
T2 | 25.36 ± 0.45 l | 24.43 ± 0.27 m | 61.75 ± 0.11 i | 7.44 ± 0.04 g | ||
T3 | 35.67 ± 0.32 h | 26.42 ± 0.32 k | 75.31 ± 0.19 efg | 7.74 ± 0.05 e | ||
T4 | 28.82 ± 0.20 k | 25.19 ± 0.17 l | 66.29 ± 0.10 h | 7.60 ± 0.09 f | ||
PG2 | T1 | 29.84 ± 0.44 j | 27.45 ± 0.33 j | 67.69 ± 0.17 h | 7.59 ± 0.04 f | |
T2 | 32.79 ± 0.41 i | 29.95 ± 0.11 i | 73.04 ± 0.15 fg | 7.72 ± 0.03 e | ||
T3 | 47.56 ± 0.42 c | 32.24 ± 0.29 g | 86.13 ± 0.12 c | 8.18 ± 0.05 c | ||
T4 | 39.88 ± 0.40 f | 31.38 ± 0.14 h | 75.77 ± 6.80 ef | 7.91 ± 0.04 d | ||
PG3 | T1 | 37.69 ± 0.45 g | 31.34 ± 0.14 h | 72.40 ± 0.08 g | 7.77 ± 0.07 e | |
T2 | 41.37 ± 0.22 e | 33.79 ± 0.07 f | 77.68 ± 0.19 e | 7.96 ± 0.07 d | ||
T3 | 51.55 ± 0.50 b | 37.56 ± 0.28 c | 91.13 ± 0.14 b | 8.26 ± 0.03 b | ||
T4 | 46.99 ± 0.11 cd | 35.21 ± 0.06 e | 84.09 ± 0.08 cd | 8.12 ± 0.04 c | ||
PG4 | T1 | 40.13 ± 0.33 f | 33.71 ± 0.05 f | 81.09 ± 0.10 d | 7.92 ± 0.03 d | |
T2 | 46.69 ± 0.47 d | 36.49 ± 0.06 d | 85.36 ± 0.34 c | 8.16 ± 0.05 c | ||
T3 | 59.38 ± 0.15 a | 40.48 ± 0.04 a | 94.24 ± 0.46 a | 8.48 ± 0.04 a | ||
T4 | 51.33 ± 0.33 b | 38.65 ± 0.42 b | 90.52 ± 0.17 b | 8.28 ± 0.05 b | ||
2020 | PG1 | T1 | 24.21 ± 0.02 l | 23.74 ± 0.37 n | 55.45 ± 0.38 h | 7.25 ± 0.07 i |
T2 | 25.80 ± 0.13 k | 24.65 ± 0.25 m | 61.90 ± 0.09 gh | 7.80 ± 0.12 g | ||
T3 | 36.32 ± 0.37 g | 26.82 ± 0.25 k | 75.67 ± 0.26 de | 7.90 ± 0.03 f | ||
T4 | 29.33 ± 0.60 j | 25.41 ± 0.32 l | 66.55 ± 0.29 fg | 7.76 ± 0.08 gh | ||
PG2 | T1 | 30.59 ± 0.45 i | 27.87 ± 0.05 j | 67.99 ± 0.10 efg | 7.70 ± 0.04 h | |
T2 | 33.18 ± 0.19 h | 30.69 ± 0.45 i | 61.16 ± 20.67 gh | 7.88 ± 0.04 f | ||
T3 | 48.56 ± 0.49 c | 32.40 ± 0.33 g | 86.43 ± 0.31 abc | 8.26 ± 0.04 d | ||
T4 | 40.84 ± 0.18 e | 31.54 ± 0.13 h | 79.13 ± 1.75 cd | 8.05 ± 0.07 e | ||
PG3 | T1 | 38.77 ± 0.38 f | 31.65 ± 0.21 h | 72.70 ± 0.28 def | 7.87 ± 0.07 f | |
T2 | 42.24 ± 0.55 d | 34.03 ± 0.08 f | 77.97 ± 0.07 cd | 8.06 ± 0.06 e | ||
T3 | 52.12 ± 0.23 b | 37.76 ± 0.17 c | 91.95 ± 0.08 ab | 8.34 ± 0.04 c | ||
T4 | 47.77 ± 0.67 c | 35.62 ± 0.39 e | 84.55 ± 0.29 bc | 8.24 ± 0.05 d | ||
PG4 | T1 | 40.58 ± 0.43 e | 33.92 ± 0.07 f | 81.36 ± 0.27 cd | 8.06 ± 0.06 e | |
T2 | 47.90 ± 1.65 c | 36.82 ± 0.23 d | 85.65 ± 0.33 abc | 8.25 ± 0.05 d | ||
T3 | 60.14 ± 0.18 a | 41.39 ± 0.34 a | 94.40 ± 0.36 a | 8.58 ± 0.02 a | ||
T4 | 52.00 ± 0.13 b | 38.79 ± 0.44 b | 90.91 ± 0.12 ab | 8.43 ± 0.05 b | ||
F-test | Phosphogypsum rates (PG) | *** | *** | *** | *** | |
Inoculation (I) | *** | *** | *** | *** | ||
Interaction (PG × I) | *** | *** | *** | *** |
Year | Phosphogypsum Rates (PG) | Inoculation (I) | Ear Length (cm) | Ear Diameter (cm) | Grains/Ear | 100-Grain Weight (g) | Grain Yield (kg ha−1) |
---|---|---|---|---|---|---|---|
2019 | PG1 | T1 | 15.97 ± 0.45 j | 3.53 ± 0.12 j | 387.33 ± 4.73 k | 31.70 ± 0.10 l | 4746.66 ± 45.09 n |
T2 | 17.17 ± 0.21 i | 3.70 ± 0.10 i | 405.00 ± 3.61 j | 32.16 ± 0.21 k | 5117.66 ± 14.01 k | ||
T3 | 20.20 ± 0.26 d | 3.90 ± 0.10 h | 425.00 ± 3.61 h | 36.20 ± 0.70 c | 5729.66 ± 28.50 e | ||
T4 | 19.17 ± 0.15 e | 4.13 ± 0.06 fg | 428.66 ± 1.53 g | 33.50 ± 0.40 fg | 5443.00 ± 42.14 h | ||
PG2 | T1 | 17.33 ± 0.42 hi | 4.00 ± 0.10 gh | 422.00 ± 3.00 i | 32.36 ± 0.15 jk | 5006.33 ± 16.26 l | |
T2 | 18.87 ± 0.15 e | 4.16 ± 0.06 f | 429.33 ± 1.53 g | 32.70 ± 0.10 ij | 5359.00 ± 51.12 i | ||
T3 | 22.63 ± 0.15 b | 4.56 ± 0.06 abc | 449.66 ± 1.15 b | 37.66 ± 0.21 b | 5936.66 ± 20.82 c | ||
T4 | 20.03 ± 0.21 d | 4.43 ± 0.06 cde | 437.66 ± 1.53 de | 33.86 ± 0.15 f | 5619.66 ± 17.56 f | ||
PG3 | T1 | 17.67 ± 0.21 gh | 4.10 ± 0.10 fg | 426.66 ± 3.21 gh | 32.60 ± 0.10 ij | 4910.00 ± 30.00 m | |
T2 | 17.90 ± 0.10 fg | 4.36 ± 0.06 de | 435.33 ± 2.08 ef | 33.13 ± 0.21 gh | 5431.66 ± 33.08 h | ||
T3 | 22.87 ± 0.06 b | 4.63 ± 0.12 ab | 452.00 ± 1.00 b | 37.93 ± 0.25 b | 6028.66 ± 23.07 b | ||
T4 | 20.20 ± 0.26 d | 4.56 ± 0.06 abc | 439.00 ± 2.00 d | 34.53 ± 0.58 e | 5752.33 ± 45.35 e | ||
PG4 | T1 | 18.23 ± 0.21 f | 4.33 ± 0.06 e | 433.33 ± 3.51 f | 32.96 ± 0.12 hi | 5236.33 ± 25.11 j | |
T2 | 19.17 ± 0.21 e | 4.50 ± 0.10 bcd | 436.66 ± 2.31 de | 33.50 ± 0.26 fg | 5534.66 ± 26.76 g | ||
T3 | 24.20 ± 0.26 a | 4.70 ± 0.10 a | 458.00 ± 1.00 a | 38.46 ± 0.15 a | 6235.33 ± 20.43 a | ||
T4 | 22.10 ± 0.10 c | 4.50 ± 0.10 bcd | 445.00 ± 1.00 c | 35.70 ± 0.10 d | 5846.33 ± 21.22 d | ||
2020 | PG1 | T1 | 16.13 ± 0.40 j | 3.60 ± 0.10 g | 389.00 ± 3.61 j | 31.83 ± 0.21 h | 4805.67 ± 45.09 n |
T2 | 17.27 ± 0.21 i | 4.03 ± 0.61 f | 414.00 ± 12.49 i | 32.33 ± 0.06 gh | 5186.67 ± 14.01 k | ||
T3 | 20.10 ± 0.26 d | 4.00 ± 0.10 f | 427.00 ± 4.36 gh | 35.00 ± 2.00 bc | 5802.00 ± 31.05 e | ||
T4 | 19.30 ± 0.10 e | 4.20 ± 0.10 def | 431.00 ± 1.73 fg | 33.57 ± 0.35 ef | 5515.00 ± 40.73 h | ||
PG2 | T1 | 17.37 ± 0.38 i | 3.97 ± 0.06 f | 422.33 ± 4.51 h | 32.37 ± 0.06 gh | 5065.33 ± 16.26 l | |
T2 | 18.90 ± 0.20 f | 4.23 ± 0.06 c–f | 430.67 ± 2.08 fg | 32.73 ± 0.06 fgh | 5428.00 ± 51.12 i | ||
T3 | 22.63 ± 0.12 bc | 4.53 ± 0.15 abc | 453.33 ± 2.89 b | 37.80 ± 0.20 a | 6010.67 ± 20.82 c | ||
T4 | 20.23 ± 0.21 d | 4.47 ± 0.06 a–d | 439.67 ± 2.08 de | 33.97 ± 0.15 de | 5690.67 ± 17.56 f | ||
PG3 | T1 | 17.77 ± 0.12 h | 4.10 ± 0.10 ef | 427.33 ± 3.06 gh | 32.63 ± 0.15 gh | 4969.00 ± 30.00 m | |
T2 | 18.00 ± 0.17 gh | 4.40 ± 0.10 b–e | 437.67 ± 1.15 de | 33.23 ± 0.29 efg | 5500.67 ± 33.08 h | ||
T3 | 23.00 ± 0.10 b | 4.73 ± 0.12 a | 450.67 ± 5.51 b | 38.30 ± 0.20 a | 6102.67 ± 23.07 b | ||
T4 | 20.47 ± 0.21 d | 4.57 ± 0.06 ab | 442.00 ± 2.00 cd | 34.50 ± 0.44 cd | 5823.33 ± 45.35 e | ||
PG4 | T1 | 18.30 ± 0.20 g | 4.23 ± 0.15 c–f | 434.33 ± 3.06 ef | 33.10 ± 0.26 efg | 5295.33 ± 25.11 j | |
T2 | 19.13 ± 0.42 ef | 4.53 ± 0.06 abc | 438.67 ± 3.21 de | 33.63 ± 0.21 def | 5603.67 ± 26.76 g | ||
T3 | 24.27 ± 0.31 a | 4.73 ± 0.06 a | 460.00 ± 1.00 a | 38.70 ± 0.26 a | 6309.33 ± 20.43 a | ||
T4 | 22.50 ± 0.20 c | 4.67 ± 0.06 ab | 447.33 ± 2.08 bc | 35.87 ± 0.12 b | 5917.33 ± 21.22 d | ||
F-test | Phosphogypsum rates (PG) | *** | *** | *** | *** | *** | |
Inoculation (I) | *** | *** | *** | *** | *** | ||
Interaction (PG × I) | *** | *** | *** | *** | *** |
Season | Character | |||
---|---|---|---|---|
pH (1:2.5) | EC (dS m−) | O.M (%) | ESP (%) | |
2019 | 8.22 ± 0.02 | 7.33 ± 0.04 | 1.56 ± 0.01 | 21.27 ± 0.17 |
2020 | 8.18 ± 0.04 | 7.41 ± 0.03 | 1.65 ± 0.04 | 20. 72 ± 0.32 |
Season | Particle Size Distribution (%) | |||
Sand | Silt | Clay | Texture grade | |
2019 | 28.22 ± 1.66 | 24.11 ± 1.83 | 47.67 ± 2.01 | Clayey |
2020 | 28.76 ± 1.78 | 24.60 ± 1.92 | 46.64 ± 2.11 | Clayey |
Season | Soluble Cations (meq L−1) | |||
Ca2+ | Mg2+ | Na+ | K+ | |
2019 | 7.32 ± 0.66 | 5.12 ± 1.22 | 24.22 ± 2.09 | 0.38 ± 0.09 |
2020 | 8.11 ± 0.51 | 5.38 ± 1.38 | 23.67 ± 2.29 | 0.34 ± 0.05 |
Season | Soluble Anions (meq L−1) | |||
CO32− | HCO3− | Cl− | SO42− | |
2019 | - | 4.01 ± 0.55 | 20.00 ± 1.29 | 13.03 ± 2.11 |
2020 | - | 3.98 ± 0.37 | 21.13 ± 1.86 | 12.39 ± 2.02 |
Season | Available Macronutrients (mg kg−1) | |||
N | P | K | ||
2019 | 8.81 ± 0.71 | 7.12 ± 1.12 | 322 ± 17.23 | |
2020 | 9.29 ± 0.45 | 7.96 ±1.32 | 341 ± 14.11 | |
Season | Total Counts of Microbes (CFU × 105 g−1 dry soil) | |||
Bacillus * | Azospirillum | |||
2019 | 44 ± 2.12 | 23 ± 1.25 | ||
2020 | 58 ± 2.65 | 35 ± 1.44 |
Season | 2019 | ||||
---|---|---|---|---|---|
Month | Temperature (°C) | Wind Speed (km day−1) | RH (%) | Rainfall (mm month−1) | |
Max | Min | ||||
May | 33.7 | 16.2 | 122.3 | 70.1 | 0.0 |
June | 35.4 | 18.4 | 117.5 | 66.3 | 0.0 |
July | 36.5 | 22.5 | 101.2 | 65.7 | 0.0 |
August | 36.7 | 19.2 | 94.2 | 63.2 | 0.0 |
September | 32.3 | 18.2 | 84.7 | 67.8 | 0.0 |
Season | 2020 | ||||
Month | Temperature (°C) | Wind Speed (km day−1) | RH (%) | Rainfall (mm month−1) | |
Max | Min | ||||
May | 33.1 | 17.2 | 125.3 | 68.5 | 0.0 |
June | 36.2 | 16.4 | 115.2 | 65.7 | 0.0 |
July | 35.4 | 22.3 | 105.8 | 64.2 | 0.0 |
August | 38.6 | 23.1 | 93.2 | 62.0 | 0.0 |
September | 37.1 | 22.5 | 85.2 | 45.9 | 0.0 |
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Khalifa, T.; Elbagory, M.; Omara, A.E.-D. Salt Stress Amelioration in Maize Plants through Phosphogypsum Application and Bacterial Inoculation. Plants 2021, 10, 2024. https://doi.org/10.3390/plants10102024
Khalifa T, Elbagory M, Omara AE-D. Salt Stress Amelioration in Maize Plants through Phosphogypsum Application and Bacterial Inoculation. Plants. 2021; 10(10):2024. https://doi.org/10.3390/plants10102024
Chicago/Turabian StyleKhalifa, Tamer, Mohssen Elbagory, and Alaa El-Dein Omara. 2021. "Salt Stress Amelioration in Maize Plants through Phosphogypsum Application and Bacterial Inoculation" Plants 10, no. 10: 2024. https://doi.org/10.3390/plants10102024