Improved Management Options for Submergence-Tolerant Sub1 Rice Genotype in Flood-Prone Rainfed Lowlands of West BengalReportar como inadecuado




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Flash flood or submergence is a common phenomenonin rice growing rainfed lowland areas that seriously affects crop establishmentleading to severe yield losses. A few submergence-tolerant rice varieties have been developed byintrogressing SUB1 gene into mega rice varieties of South Asia. Two of these, Swarna-Sub1 andSambha Mahsuri-Sub1, are already released in India for the commercialcultivation. Performance of these varieties can be further enhanced throughadoption of appropriate management practices both in nursery and in main field.Two on-station field experiments were conducted using Swarna-Sub1 during thewet season kharif of 2011 at Rice Research Station,Chinsurah, Hooghly, West Bengal India. Results of these experiments revealedthat 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 andtransplanting of aged seedlings 44 days significantly improved plant survival, yieldattributing traits and grain yield. An additionalN-dose of 20 kg ha-1 at 7 days after receding of flood water resulted in betterpost-submergence recovery and maximum grain yield. In the on-farm trials conducted at three different locations in WestBengal, 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-submergenceproduced maximum grain yield of Swarna-Sub1.

KEYWORDS

Nursery Management; Post-Flood Nitrogen Management; Submergence; Survival; Swarna-Sub1

Cite this paper

M. Bhowmick, M. Dhara, S. Singh, M. Dar and U. Singh -Improved Management Options for Submergence-Tolerant Sub1 Rice Genotype in Flood-Prone Rainfed Lowlands of West Bengal,- American Journal of Plant Sciences, Vol. 5 No. 1, 2014, pp. 14-23. doi: 10.4236-ajps.2014.51003.





Autor: Malay K. Bhowmick, Madhab C. Dhara, Sudhanshu Singh, Manzoor H. Dar, Uma S. Singh

Fuente: http://www.scirp.org/



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