Agritrop
Accueil

Modifications in development and growth of a dual-adapted tropical rice variety grown as either a flooded or an aerobic crop

Clerget Benoît, Bueno Crisanta Sunio, Quilty James R., Correa Teodoro Q., Sandro Joseph. 2014. Modifications in development and growth of a dual-adapted tropical rice variety grown as either a flooded or an aerobic crop. Field Crops Research, 155 : 134-143.

Article de revue ; Article de revue à facteur d'impact
[img] Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
document_571331.pdf

Télécharger (743kB)

Quartile : Q1, Sujet : AGRONOMY

Résumé : As the human population continues to grow and competition for natural resources increases, there is a consequent need to produce more food with fewer resources. Flooded rice crops use large quantities of water, which becomes scarcer for farmers. New methods of saving irrigation water have been tested and released but they often suffer from a yield trade-off. A comparative study was carried out with a recent dual-adapted variety cultivated as either a flooded transplanted crop or a direct-seeded and soil water-saturated crop, referred to as an aerobic crop, to dissect the crop physiological differences induced by crop management. Experiments were conducted at IRRI's experiment station in Los Baños, Philippines, in the dry seasons of 2011 and 2012. Grain yields were 2 tons/ha or 25% lower in the aerobic crop as a result of a complex series of modifications and adjustments in plant architecture and yield components. Four main changes - higher plant density, slower rate of leaf appearance, lower nitrogen content, and reduced size of all organs - induced by the aerobic crop environment were responsible for three chains of modifications that resulted in lower biomass accumulation and finally lower grain yield. Leaf appearance rates were bilinear in both environments, initially similar in both environments and slower after an inflection point that occurred at the appearance of the 8th leaf in aerobic crops instead of the 11th leaf in flooded crops. As a consequence, two fewer leaves were produced by main tillers in aerobic crops, whose individual leaf area thus was much lower. In 2012, plant nitrogen content was about 1% lower in the aerobic crop than in the flooded crop during the entire crop duration. Biomass accumulation of the variety used was biphasic in both environments, with high radiation use efficiency during the two phases of effective biomass accumulation in flooded crops, and the standard radiation use efficiency expected with C3 species in aerobic crops during the same phases.

Mots-clés Agrovoc : Oryza sativa, pratique culturale, riz irrigué, riz inondé, conservation de l'eau, variété, croissance, développement biologique, espacement, teneur en azote, adaptabilité, climat tropical

Mots-clés géographiques Agrovoc : Philippines

Classification Agris : F08 - Systèmes et modes de culture
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Clerget Benoît, CIRAD-BIOS-UMR AGAP (PHL)
  • Bueno Crisanta Sunio, IRRI [International Rice Research Institute] (PHL)
  • Quilty James R., IRRI [International Rice Research Institute] (PHL)
  • Correa Teodoro Q., IRRI [International Rice Research Institute] (PHL)
  • Sandro Joseph, IRRI [International Rice Research Institute] (PHL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/571331/)

Voir la notice (accès réservé à Agritrop) Voir la notice (accès réservé à Agritrop)

[ Page générée et mise en cache le 2024-01-28 ]