The effetcs of irrigation management on yield and water productivity of inbred, hybrid, and aerobic rice varieties
2002
Lu, G. | Cabangon, R. | Tuong, T.P. | Belder, P. | Bouman, B.A.M. | Castillo, E.
The objective of this study was to compare the effects of water-saving irrigation regimes on yield, irrigation water input, water balance components, and water productivity of aerobic and conventional rice varieties. The experiments were carried out in Tuanlin, Hubei Province, and in Huibei, Henan Province, China. The main plots at each site were irrigation water management regimes, ranging from rainfed to irrigated continuously flooded. In the sub-plots, hybrid rice variety 2you725 was compared with aerobic rice variety HD502 at Tuanlin and inbred variety 90247 with aerobic rice variety HD502 at Huibei. The experiment in Tuanlin included two N-fertilizer treatments (180 kg N ha-1 and no N fertilizer) in the sub-subplots. The aerobic rice variety at Tuanlin was heavily infested with stem borer, while that at Huibei yielded significantly less than the inbred rice variety because of reduced tillering and duration in all water regimes. Continuous flooding had the highest irrigation water inputs, followed by alternate wetting and drying irrigation, saturated soil culture in raised beds, flush irrigation in aerobic soil, and rainfed treatments. Rice yields did not differ significantly among water treatments. Flush irrigation and rainfed rice had the highest irrigation and total water productivity. The lack of significant differences in rice yield between water treatments was probably due to shallow groundwater tables at both sites. The shallow groundwater table depth in these experiments has implications for extrapolating the effects of the water-saving irrigation treatments to larger spatial scales.
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