Nitrogen economy and water productivity of lowland rice under water-saving irrigation

We concluded that the absence of an effect of water-saving regimes was caused by shallow groundwater tables of <40-cm depth in 2000-2001 at Tuanlin and at Muñoz, whereas at Tuanlin in 2002 there was water deficit in all treatments caused by a deeper drainage. In irrigation systems with a relatively shallow water table, optimal N management is as important as water-saving irrigation to enhance water productivity.