Table 4 Significance of NH4+-N content in different soil layers under different fertilization timing sequences in 2020–2021.
Growth stage | Soil depth | 2020 Soil NH4+-N content (mg/kg) | 2021 Soil NH4+-N content (mg/kg) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
S1 | S2 | S3 | S4 | S5 | S6 | S7 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | ||
FBS | 0–20 | 6.32b | 6.74a | 6.41b | 6.24b | 6.34b | 6.79a | 4.22c | 7.09e | 8.87a | 6.85e | 7.35d | 7.90c | 8.43b | 6.33f |
20–40 | 5.77a | 5.68ab | 5.66abc | 5.27d | 5.42bcd | 5.39cd | 4.07e | 6.83b | 6.33cd | 6.77b | 6.58bc | 7.51a | 7.33a | 6.08d | |
40–60 | 5.40ab | 4.47d | 4.98c | 5.66a | 4.29de | 5.22bc | 3.97e | 6.80a | 6.18b | 6.67a | 6.38ab | 6.41ab | 6.11b | 5.45c | |
FFS | 0–20 | 7.32d | 8.19b | 7.15d | 7.81c | 8.02bc | 8.72a | 6.31e | 9.62c | 10.81a | 9.38c | 10.04b | 10.11b | 10.29b | 8.39d |
20–40 | 6.30d | 7.77b | 7.75b | 7.13c | 8.27a | 6.85c | 5.97d | 8.07d | 9.17b | 7.35e | 8.29d | 9.56a | 8.82c | 7.19e | |
40–60 | 7.39b | 5.30d | 7.83a | 6.24c | 6.02c | 5.96c | 5.05d | 8.79ab | 8.18c | 8.95a | 8.46bc | 7.52d | 8.25c | 7.27d | |
PBS | 0–20 | 4.55d | 5.38b | 4.73cd | 4.93c | 5.32b | 6.25a | 4.27e | 6.95de | 7.60b | 6.77e | 7.16cd | 7.39bc | 8.67a | 6.24f |
20–40 | 4.13b | 4.32b | 4.95a | 4.87a | 5.03a | 3.34c | 3.06c | 6.43c | 6.67c | 6.28c | 7.06b | 7.88a | 6.56c | 5.57d | |
40–60 | 5.21a | 4.21b | 5.23a | 4.35b | 4.16b | 3.35c | 2.38d | 7.74a | 6.83c | 7.95a | 7.28b | 6.25d | 7.05bc | 5.73e | |
BOS | 0–20 | 8.04a | 8.09a | 7.95a | 8.06a | 8.07a | 8.08a | 7.82a | 9.17bc | 9.60ab | 9.18bc | 9.28ab | 9.31ab | 9.63a | 8.84c |
20–40 | 6.73c | 6.92bc | 7.16b | 6.87bc | 7.65a | 6.38d | 6.38d | 8.12b | 8.38b | 7.61c | 8.09b | 9.23a | 8.16b | 7.61c | |
40–60 | 5.90a | 5.93a | 6.06a | 5.99a | 5.94a | 5.78a | 4.86b | 8.64a | 8.15b | 8.69a | 8.17b | 7.97b | 8.13b | 7.08c | |
