HomeInternational Rice Research Notesvol. 22 no. 2 (1997)

Evaluation of Rice Hybrids in Varying Environments

C Lavanya | R Vijaykumar | B Sitadevi

Discipline: Agriculture



Rice varieties cultivated in coastal areas of India are highly season-specific. Most of them are suitable either for wet (WS) or dry seasons (DS), but a few are suitable for both seasons. Nitrogen fertilization in WS is limited by the problem of lodging caused by frequent rains or storms. Commercial exploitation of heterosis depends on identification of hybrids adapted to variable weather and N levels. Thirty rice hybrids were evaluated in five environments at two N levels in DS, 60 and 120 N (E1, E2) and three in WS, 30, 60, and 120 N (E3, E4, and E5) (see table). They were derived from five CMS lines (IR46830A, IR54752A, IR54754A, IR58025A, and IR62829A) and six restorer lines (WGL3962, Swarna, Vajram, Pratibha, IR36, and IR64). The trial was carried out under an irrigated system at the ARS.