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Left to right: seedlings of sensitive varieties “IR64” and “IR42” and tolerant landraces “Khao Hlan On” and “Khaiyan” 7 days after sowing in soil and flooding with 10 cm of water (from image collection of the International Rice Research Institute (IRRI) publicly available at Flickr http://www.flickr.com/photos/ricephotos/2199544108/in/photostream/).
