The effect of controlled drainage (CD) on ammonia volatilization (AV) losses from paddy fields under controlled irrigation (CI) was investigated by managing water table control levels using a lysimeter. Three drainage treatments were implemented, namely, controlled water table depth 1 (CWT1), controlled water table depth 2 (CWT2), and controlled water table depth 3 (CWT3). As the water table control levels increased, irrigation water volumes in the CI paddy fields decreased. AV losses from paddy fields reduced due to the increases in water table control levels. Seasonal AV losses from CWT1, CWT2, and CWT3 were 59.8, 56.7, and 53.0 kg N ha−1, respectively. AV losses from CWT3 were 13.1% and 8.4% lower than those from CWT1 and CWT2, respectively. A significant difference in the seasonal AV losses was confirmed between CWT1 and CWT3. Less weekly AV losses followed by TF and PF were also observed as the water table control levels increased. The application of CD by increasing water table control levels to a suitable level could effectively reduce irrigation water volumes and AV losses from CI paddy fields. The combination of CI and CD may be a feasible water management method of reducing AV losses from paddy fields.
展开▼
机译：通过使用溶渗仪管理地下水位控制水平，研究了受控排水（CD）对水稻在受控灌溉（CI）下氨气挥发（AV）损失的影响。实施了三种排水处理，即受控地下水位深度1（CWT1），受控地下水位深度2（CWT2）和受控地下水位深度3（CWT3）。随着地下水位控制水平的提高，CI稻田的灌溉水量减少。由于地下水位控制水平的提高，水田造成的视听损失减少。 CWT1，CWT2和CWT3的季节性AV损失分别为59.8、56.7和53.0 kg N ha -1 。 CWT3的AV损失分别比CWT1和CWT2的AV损失低13.1％和8.4％。 CWT1和CWT3之间确认了季节性AV损失的显着差异。随着地下水位控制水平的提高，每周的AV损失减少，其次是TF和PF。通过将水位控制水平提高到适当水平来应用CD，可以有效减少灌溉水量和CI稻田的AV损失。 CI和CD的结合可能是减少稻田AV损失的可行水管理方法。
展开▼
