Hybrid rice in rainfed environments [Philippines]
1988
Namuco, O.S. | Ingram, K.T. | Maguling, M.A. | Virmani, S.S. (International Rice Research Inst., Los Banos, Laguna (Philippines). Agronomy Dept.)
Two hybrids (IR46830 A/IR9761-29-1R and IR 54752 A/IR46 R) and their parents were dry seeded (75 kg/ha) and grown under strictly rainfed conditions in lowland and upland fields of International Rice Research Institute, Philippines in 1987 wet season. IR46, one of the parents, was the check variety. Urea (90 kg N/ha) was topdressed on 17 Sep. Water deficit occured 45 to 60 d after seeding (DAS) with a maximum stress of 69 k Pa soil moisture tension at 20 cm soil depth and 5 k Pa at 60 cm. Hybrid IR 46830A/IR9761-19-1R yielded highest with 105% midparent heterosis for the lowland trial and 78% for the upland trial. Hybrid IR 54752 A/IR46 R, exhibited on 7% and 8% midparent heterosis in the 2 trials and yielded as much as did IR46. The high yield of IR46830A/IR9761-19-1R was attributed to a high number of panicles. It showed midparent heterosis for all characters at both sides. Results indicate that hybrids developed specifically for irrigated lowland can be grown under rainfed conditions and still exhibit heterosis even when subjected to water deficit. Results further suggest that hybrid rices can be developed for rainfed environments.
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