Table 1.
Nutrient use efficiency of corn plants affected by different application rates of CNPs in Spodosol and Alfisol soils.
| Items | N Use Efficiency (%) | P Use Efficiency (%) | K Use Efficiency (%) | |||
|---|---|---|---|---|---|---|
| Spodosol | Alfisol | Spodosol | Alfisol | Spodosol | Alfisol | |
| FB0 | 2.45 ± 0.56 a | 36.1 ± 3.24 a | 1.67 ± 0.37 a | 16.7 ± 2.12 ab | 3.83 ± 0.32 a | 30.9 ± 2.81 a |
| FB50 | 25.3 ± 3.79 b | 39.6 ± 2.06 a | 7.04 ± 1.33 ab | 16.5 ± 1.20 a | 14.7 ± 2.43 b | 36.8 ± 1.50 ab |
| FB100 | 35.1 ± 2.75 c | 43.7 ± 2.34 ab | 9.93 ± 2.15 bc | 16.9 ± 1.26 ab | 19.7 ± 1.60 c | 38.1 ± 4.03 ab |
| FB200 | 48.8 ± 4.89 d | 50.5 ± 3.47 b | 11.8 ± 0.77 c | 19.0 ± 1.53 ab | 26.7 ± 1.97 d | 40.4 ± 2.38 b |
| FB400 | 24.0 ± 1.79 b | 41.9 ± 3.53 ab | 10.7 ± 1.51 c | 16.3 ± 1.94 a | 15.5 ± 1.58 b | 43.5 ± 4.71 b |
| FB800 | 2.72 ± 0.53 a | 44.7 ± 3.62 ab | 3.72 ± 0.64 a | 22.4 ± 2.81 b | 5.11 ± 0.51 a | 44.7 ± 2.38 b |
Note: F0B0, control (without fertilizers and CNPs); F0B200, without fertilizers and with CNPs at 200 mg kg−1 soil; and FB0, FB50, FB100, FB200, FB400 and FB800 represent those with and CNPs at application rates of 0, 50, 100, 200, 400 and 800 mg kg−1 soil, respectively. Error bars represent the standard error of the mean (n = 5). The letters a, b, c, and d indicate statistically significant difference at p < 0.05 within each column comparison between the treatments. Means with no common letters are significantly different (p < 0.05).