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The experimental design of the three years.
| Year | Nitrogen dose (kg ha-1) | Nitrogen application | Experimental condition | Nitrogen form |
|---|---|---|---|---|
| 2014 | 0,180∗ | TFA,OFA | Pot | 15N |
| 2015 | 0,90,180 | TFA,OFA | Field | 14N |
| 2016 | 0,180 | TFA,OFA | Field | 14N |
∗The nitrogen applied in pot experiment was 1.2 g N pot-1, which was equivalent to a paddy application of 180 kg ha-1 at a density of 15 × 104 hills ha-1. TFA: traditional nitrogen fertilizer application, OFA: optimized nitrogen fertilizer application.
