Abstract
The study is aimed to determine the effect of alternate wetting and drying (AWD) compared to continuous flooding (CF) on soil available nitrogen (N), rice yield in the field experiment and N mineralization in the laboratory. The study was conducted in (i) the rice field in Autumn-Winter 2014 at Hoa Binh district, Bac Lieu province and (ii) in the laboratory with anaerobic and aerobic incubation for N mineralization after two alternate wetting-drying processes at the rice field. The experiment was designed in a completely randomized block with 3 treatments including CF, AWD1 (irrigated when water level below -15 cm) and AWD2 (below -30 cm) with 3 replications for each treatment. The results showed that AWD saved about 13-18% of irrigation water in comparison with CF. Applying AWD2 and AWD1 had respectively higher NH4+ and NO3- contents than those from CF at the harvesting stage, but did not affect the rice yield. The results of mineralization showed that the mineral N content in aerobic incubation was higher than that in anaerobic incubation. Particularly, AWD1 had a significant increase in mineralized NH4+ after 21, 28 days of anaerobic incubation, while after 7 days in aerobic incubation. Similarly, AWD1 also achieved high mineralized NO3-content in 21 days of anaerobic and 28 days of aerobic incubations.
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