Growth and yield of rice (Oryza sativa L.) as affected by cultivars, seeding depth and water deficits at vegetative stage

Sanusan Suchada, Polthanee Anan, Audebert Alain, Seripong Surasak, Mouret Jean Claude. 2010. Growth and yield of rice (Oryza sativa L.) as affected by cultivars, seeding depth and water deficits at vegetative stage. Asian Journal of Plant Sciences, 9 (1) : 36-43.

https://doi.org/10.3923/ajps.2010.36.43

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Résumé : This study investigates the effects of different seeding depths and water stress on growth and yield of direct-seeded rice. The experiment was a 3x2x2 factorial in a randomized complete block design with four replications. The main factors (03) were seeding depths (0, 1 and 5 cm), water level (well watered and water stress at 30 days after seeding (DAS) and rice cultivars (Pathum Thani 1 and Suphan Buri 1). Above-ground biomass and root length density were significantly affected by rice cultivars, seeding depths and water stress. The Suphan Buri 1 had a higher above ground biomass and root length density than the Pathum Thani 1. At the first 7 days of water stress, maximum above-ground biomass was obtained at 1 cm seeding depth. But at a later stage, the highest above ground biomass was observed with a seeding depth of 5 cm at both 60 and 90 days after seeding. The greatest root length density was obtained at a seeding depth of 5 cm. Grain yield was significantly affected by seeding depths and water stress. The highest grain yield was obtained in 5 cm seeding depths compared with other low depth under water stress at vegetative stage (30 DAS). It was concluded that yield loss under water stress at vegetative stage may be compensated for by increasing seeding depth above shallow depth levels.

Mots-clés Agrovoc : Oryza sativa, profondeur de semis, rendement des cultures, semis direct, stress dû à la sécheresse, variété, déficit d'humidité du sol, système racinaire

Mots-clés géographiques Agrovoc : Thaïlande

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F07 - Façons culturales
F01 - Culture des plantes
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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