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Improved Management Options for Submergence-Tolerant (Sub1) Rice Genotype in Flood-Prone Rainfed Lowlands of West Bengal

Flash flood or submergence is a common phenomenon 
in rice growing rainfed lowland areas that seriously affects crop establishment 
leading to severe yield losses. A few submergence-tolerant rice varieties have been developed by 
introgressing SUB1 gene into mega rice varieties of South Asia. Two of these, Swarna-Sub1 and 
Sambha Mahsuri-Sub1, are already released in India for the commercial 
cultivation. Performance of these varieties can be further enhanced through 
adoption of appropriate management practices both in nursery and in main field. 
Two on-station field experiments were conducted using Swarna-Sub1 during the 
wet season (kharif) of 2011 at Rice Research Station, 
Chinsurah, Hooghly, West Bengal (India). Results of these experiments revealed 
that the use of lower seeding density (25 g m-2), application of balanced doses of N-P2O5-K2O 
@ 80-40-40 kg ha-1 in nursery and 
transplanting of aged seedlings (44 days) significantly improved plant survival, yield 
attributing traits and grain yield. An additional 
N-dose of 20 kg ha-1 at 7 days after receding of flood water resulted in better 
post-submergence recovery and maximum grain yield. In the on-farm trials conducted at three different locations in West 
Bengal, nursery raising of seedlings with the application of N-P2O5-K2O @ 
80-40-40 kg ha-1, transplanting them at an optimum age (35 days) and application of 20 kg·N ha-1 after 7 days of de-submergence 
produced maximum grain yield of Swarna-Sub1.