Yield potential of rainfed lowland and upland rice in different irrigation ways
2012
Amante, M.M. | Vikram, P. | Swamy, B.P.M. | Maturan, P.C. | Dixit, S. | Kumar, A., International Rice Research Inst., DAPO 7777, Metro Manila 1301 (Philippines). Plant Breeding, Genetics and Biochemistry Div.
Rice is the staple food for 40% of the world population. Being a semi-aquatic plant, water use efficiency is vital for the crop yield. Threatening climate change, unpredictable rainfall patterns, frequency and intensity of the rain affects rice production badly in rainfed upland as well as rainfed lowland rice ecosystems. Lowland rice is cultivated under flooded transplanted management, where as the upland rice could be grown either in rainfed condition or under sprinkler irrigation. The crop management strategies with enhanced water use efficiency could provide substantial help to the rice growers in rainfed areas. A series of field trials were conducted at IRRI in 2011 wet season for two rice ecosystems and compared in terms of their yield. The rainfed lowland (medium and late duration) and upland adapted (early and medium duration) cultivars were grown under flash flooding as well as under pivot irrigation and the mean grain yield under both irrigation systems was compared. Mean yield of lowland medium and long duration cultivars grown under flash flooding versus pivot irrigation were 2.988 and 3.734 t/ha against 2.239 and 2.013 t/ha, respectively. Whereas, the mean yield of upland early and medium duration cultivars grown under sprinkler versus pivot irrigation were 1.745 and 1.780 t/ha against 2.743 and 2.274 t/ha respectively. Comparing mean yield of lowland and upland cultivars under pivot irrigation showed that the upland rice had higher mean values than the lowland. Productivity of upland rice can be improved using pivot irrigation technology.
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