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Targeting management practices for rice yield gains in stress-prone environments of Myanmar

Rice in Myanmar is grown in diverse environments, including inland dry zone and salt-affected coastal deltas.‎ This study evaluated management options that could improve productivity and reduce risks of rice crop in stressprone areas of the country.‎ We selected four sites from two regions in the central dry zone (Wundwin) and the Ayeyarwady delta (Labutta, Bogale and Mawlamyinegyun).‎ We used experimental and survey datasets on farmers’ practices and rice yields from 2012 to 2014 to run the ORYZA model to simulate the climatic yield potential (YP;‎ yield without stress) and the attainable yield under rainfed conditions (YW;‎ yield limited by water), saline conditions (YS;‎ yield limited by salinity), and under conditions of current farmers’ practices (YF;‎ yield in farmers’ practices).‎ Simulated yield responses to different management practices showed spatial variability within and among the selected sites.‎ YP ranged from 5.‎4 to 11.‎1 t ha−1, YW ranged from 0.‎5 to 7.‎5 t ha−1, and YF ranged from 2.‎2 to 4.‎2 t ha−1.‎ In salt-affected areas, average YS ranged from less than 0.‎1 t ha-1 to 5.‎6 t ha−1.‎ Yield gains with the choice of an improved variety and adjusted sowing date were estimated at up to 53% above YF.‎ Changing the time of sowing and using improved rice varieties provided the greatest yield gains in salt-affected and drought-prone areas where YF was the least.‎ In areas where YF was greater, the improvement of nitrogen management provided larger benefits than in areas with lower YF.‎ We conclude that an integrated approach using remote-sensing technologies, crop modeling, and a geographic information system is valuable for targeting the best management options to close the yield gap in unfavorable rice environments in Asia.‎

Authors: 
A.M.‎ Radanielson, Yoichiro Kato, Leo Kris Palao, Gudina Feyisa, Arelene Julia Malabayabas, Jorrel K.‎ Aunario, Cornelia Garcia, Jane G.‎ Balanza, Khin Thawda Win, Rakesh K.‎ Singh, Chenie Zamora, Daw Tin Tin Myint, David E.‎ Johnson
Year: 
۲۰۱۹
Publication type: 
Scientific Paper
Publication Source: 
Field Crops Research
Volume/Chapter/Issue: 
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