Varietal adaptation to drought and submergence prone rainfed lowland conditions

Cultivar evaluation research was conducted in a rainfed lowland rice area in the Cagayan Valley [Philippines] to identify rice cultivars adopted to environments with severe hydrological stresses. Semidwarf modern rice cultivars grown are not adopted in these areas. The predominant cultivars grown ar...

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Bibliographic Details
Published inPhilippine Journal of Crop Science (Philippines) Vol. 14; no. 1
Main Authors Pernito, R, Garrity, D.P, Mackill, D.J. (International Rice Research Inst., Los Banos, Laguna (Philippines). Multiple Cropping Dept.)
Format Journal Article
LanguageEnglish
Published 01.05.1989
Subjects
ADAPTACION
ADAPTATION
ESTRES
FILIPINAS
ORYZA SATIVA
PHILIPPINES
REGION DE BASSE ALTITUDE
SECHERESSE
SEQUIA
STRESS
TIERRAS BAJAS
VARIEDADES
VARIETE
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Summary:Cultivar evaluation research was conducted in a rainfed lowland rice area in the Cagayan Valley [Philippines] to identify rice cultivars adopted to environments with severe hydrological stresses. Semidwarf modern rice cultivars grown are not adopted in these areas. The predominant cultivars grown are of the Wagwag group. Hundreds of entries were tested in three strata of a toposequence whose characteristics represented three major classes of unfavorable rainfed lowland rice: drought prone (DP), drought and submergence prone (DSP), and submergence prone (SP). Yield nurseries of promising lines were composed specifically for each stress environment. Testing included researcher-and farmer-managed yield trials in 1985, 1986 and 1987 WS [wet season]. Several medium-maturing photoperiod insensitive lines were identified with superior performance in each environment. They are moderately tolerant to late transplanting and mature one month earlier than the Wagwag cultivars. These lines are proposed as potential commercial cultivars for the rainfed ricelands of Cagayan where traditional varieties predominate.
Bibliography:F30
8912216
ISSN:0115-463X