TABLE 2.
Leaf physiological attributes and yield of banana under different nitrogen fertilization rates.
| Treatment | NR (μmol⋅g–1⋅h–1) | GS (μmol⋅g–1⋅h–1) | SPS (μg⋅g–1⋅min–1) | SS (μg⋅g–1⋅min–1) | Soluble protein (mg⋅g–1) | Soluble sugar (mg⋅g–1) | Chlorophyll content (SPAD value) | Yield (kg) |
| TCK | 0.69 (0.03)ab | 7.61 (0.39)cd | 329.68 (22.52)bc | 632.82 (37.79)a | 38.64 (1.05)c | 123.67 (2.27)d | 56.83 (1.24)a | 11.93 (1.33)b |
| N0 | 0.64 (0.00)b | 7.60 (0.47)cd | 547.02 (21.04)a | 814.61 (58.91)a | 35.29 (0.50)d | 135.68 (1.88)d | 57.73 (2.05)a | 19.85 (0.99)a |
| N145 | 0.71 (0.03)ab | 5.72 (0.25)d | 373.42 (25.54)b | 721.68 (45.83)a | 39.57 (0.79)c | 139.14 (3.74)c | 57.83 (2.07)a | 19.78 (1.70)a |
| N248 | 0.72 (0.03)ab | 9.69 (0.50)bc | 347.72 (16.02)bc | 782.34 (51.31)a | 41.06 (0.48)c | 150.82 (3.79)bc | 55.37 (2.77)a | 19.39 (0.82)a |
| N352 | 0.71 (0.00)ab | 13.45 (0.85)a | 228.62 (4.73)d | 831.52 (52.21)a | 51.51 (0.16)a | 186.31 (2.84)a | 63.63 (0.37)a | 21.83 (0.29)a |
| N455 | 0.78 (0.03)a | 10.82 (0.45)b | 277.87 (18.53)cd | 833.12 (41.68)a | 46.59 (0.22)b | 162.95 (1.43)b | 62.87 (1.07)a | 21.47 (0.22)a |
| NFT | 0.69 (0.03)ab | 9.91 (0.44)bc | 221.71 (16.49)d | 777.90 (62.50)a | 44.48 (0.95)b | 124.43 (2.86)d | 59.33 (2.37)a | 18.37 (2.61)a |
Means (SE) followed by the different letters in a same column are significantly different at p < 0.05 (Tukey’s test). NR, nitrate reductase; GS, glutamine synthetase; SS, sucrose synthase; SPS, sucrose phosphate synthase; TCK, control. NFT: chemical fertilization rate used by local farmers.