Table 3.
The nitrogen distribution in different soil layers in different treatments at 35 days after rice transplanting.
| Treatment | Soil (0–5 cm) |
Soil (5–15 cm) |
Soil (15–20 cm) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TN (g kg-) | Ndff (%) | Ndff (kg ha-) | FNP (%) | TN (g kg-) | Ndff (%) | Ndff (kg ha-) | FNP (%) | TN (g kg-) | Ndff (%) | Ndff (kg ha-) | FNP (%) | |
| NBP | 2.1 a | 1.7 a | 23.3 a | 84.7 a | 1.7 a | 0.2 b | 3.9 b | 13.3 b | 1.5 b | 0.1 b | 0.6 b | 2.0 c |
| NDP | 2.6 a | 1.2 ab | 20.5 a | 37.3 b | 1.9 a | 0.9 a | 22.0 a | 37.5 a | 1.5 b | 1.4 a | 14.3 a | 25.2 b |
| NPKDP | 2.1 a | 0.9 b | 12.4 b | 18.4 c | 1.8 a | 1.1 a | 27.5 a | 39.4 a | 2.0 a | 2.0 a | 26.6 a | 42.2 a |
Ndff means the soil N derived from fertilizer; 15N (mg kg-1) = TN (mg kg-1) ×15N (%); FNP (%) means the amount of fertilizer-N in one soil layer accounts for the proportion of the total amount of fertilizer-N in the three soil layers, for example, FNP0-5 (%) = Ndff0-5/(Ndff0-5 + Ndff5-15 + Ndff15-20) × 100. Different letters means significant difference at the 0.05 probability level according to Duncan’s multiple comparison test.