Opportunities to improve phosphorus efficiency and soil fertility in rainfed lowlad and upland rice ecosystems

Kirk G.J.D., George Thomas, Courtois Brigitte, Senadhira D.. 1998. Opportunities to improve phosphorus efficiency and soil fertility in rainfed lowlad and upland rice ecosystems. Field Crops Research, 56 (1/2) : 73-92.

Résumé : The use of improved germplasm and management to increase rice production in rainfed lowland and upland systems is discussed. Understanding of the mechanisms conferring P efficiency, particularly external efficiency through root-induced changes in the rhizosphere, is reviewed together with evidence for genetic variation in P efficiency in upland and lowland rice germplasm. The following areas for improving resource and input management are considered: P management under alternately wet and dry soil conditions; P fertilizer formulations for banding in highly-weathered soils; cumulative responses to P fertilizer, including interactions with biological N fixation by legumes; amelioration of subsoil acidity, especially by eaching down the effects of surface-applied lime; and the management of soil spatial variability. Areas for future research are given.

Mots-clés Agrovoc : Oryza, riz inondé, riz pluvial, phosphore, germoplasme, engrais phosphaté, fertilité du sol, relation plante sol, rhizosphère, pH du sol, propriété physicochimique du sol, amélioration des plantes, gestion du sol

Classification Agris : P35 - Fertilité du sol
F30 - Génétique et amélioration des plantes

Auteurs et affiliations

• Kirk G.J.D.
• George Thomas
• Courtois Brigitte, CIRAD-CA-CALIM (PHL) ORCID: 0000-0003-2118-7102
• Senadhira D.

Source : Cirad - Agritrop (https://agritrop.cirad.fr/391813/)

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