Table 4.
Effect of nitrogen deficiency and compensation on yield and its components in double-cropping super hybrid late rice.
| Years | Treatments | Effective panicle per plant | Panicle length (cm) | Number of total grains | Seed setting ratea (%) | 1000-grain weight (g) | Yield per plant (g) | HIb (%) | CIc |
|---|---|---|---|---|---|---|---|---|---|
| 2014 | CK0 | 2.80c | 21.54b | 170.36b | 91.73b | 21.93b | 9.19c | 60.71b | 0.43 |
| CK1 | 4.60b | 24.31a | 218.50a | 95.91a | 22.80ab | 21.39ab | 62.16b | 1 | |
| CK2 | 5.20b | 22.22b | 173.15b | 93.99ab | 23.44a | 19.41b | 62.10b | 0.91 | |
| T1 | 6.20a | 22.94ab | 194.79b | 92.49b | 23.04a | 23.90a | 66.77a | 1.12 | |
| 2015 | CK0 | 3.00c | 22.47a | 176.60a | 91.36b | 21.90b | 9.91c | 56.62b | 0.42 |
| CK1 | 5.60b | 23.63a | 201.75a | 94.58a | 22.84a | 23.63ab | 59.07ab | 1 | |
| CK2 | 5.20b | 23.92a | 187.79a | 95.31a | 22.99a | 21.25b | 60.11a | 0.9 | |
| T1 | 6.40a | 22.96a | 190.80a | 93.34a | 22.78a | 24.87a | 61.55a | 1.05 |
CK0, N fertilizer was not supplied during all stages of growth (blank control); CK1, constant supply of N throughout different stages of growth; CK2, constant N compensation at young panicle differentiation stage, after N deficiency at tillering stage; T1, double N compensation at young panicle differentiation stage, after N deficiency at tillering stage. Within each year, values in the same column show mean via the Tukey’s multiple range test, and different letters indicate that the means were statistically different (P < 0.05), n = 4; Data are averages observed for two study years (n = 6, 2 years × 3 replicates). aSeed setting rate = number of filled grains per panicle/number of total grains per panicle. bHI = total grain weight per plant (dry weigh)/total above ground biomass per plant (dry weigh). cCI = yield per plant/yield per plant of CK1.