Written Paper

CORH 1: the first rice hybrid for Tamil Nadu, India  [1994]

Rangaswamy, M. Prasad, M.N. Sree Rangaswamy, S.R. Virmani, S.S. et al.

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CORH1 is a rice hybrid selected at the Paddy Breeding Station, Coimbatore, Tamil Nadu [India]. it is developed using the cytoplasmic genetic male sterility and fertility restorer system. IR62829 A and IR10198-66-2 R are the parents. CORH1 matures in 100-115 d and is up to 75 cm tall. It has high-tillering ability, giving up to 20 productive tillers/hill at 25- x 20-cm spacing. The average grain number is 150/panicle; its 1,000-grain weight is 20 g. Grains are medium slender and straw-colored, kernels are white. CORH1 is best suited for May-Jun sowing in Tamil Nadu. The mean grain yield for CORH1 at 74 locations in research station, on-farm, and national hybrid rice trials was 5.9 t/ha compared with 5.0 t/ha for IR50. The mean biological yield of CORH1 was 11.2 t/ha (5.9 t grain and 5.3 t straw). The highest recorded grain yield was 10.1 t/ha. Physical, cooking, chemical, and organoleptic characters are all good. CORH1 is moderately resistant to whitebacked planthopper, brown planthopper, green leafhopper, sheath rot, brown spot, and rice tungro virus under field conditions


International Rice Research Notes (Philippines)

ISSN : 0115-0944