Modeling growth and distribution of maize (Zea mays L.) roots under field conditions in the eastern plains of Colombia

Roveda-Hoyos G., Chopart Jean-Louis, Baquero José, Rojas Leyla Amparo, Dingkuhn Michaël. 2001. Modeling growth and distribution of maize (Zea mays L.) roots under field conditions in the eastern plains of Colombia. In : Plant nutrition : Food security and sustainability of agro-ecosystems through basic and applied research. Horst Walter J. (ed.), Schenk M.K. (ed.), Bürkert A. (ed.), Claasen N. (ed.), Flessa H. (ed.), Frommer W.B. (ed.), Goldbach H. (ed.), Olfs H.W. (ed.), Romheld Volker (ed.), Sattelmacher B. (ed.), Schmidhalter U. (ed.), Schubert S. (ed.), Wirén N. (ed.), W. ICPN. Dordrecht : Kluwer Academic Publishers, 576-577. (Developments in Plant and Soil Sciences, 92) ISBN 0-7923-7105-4 International Plant Nutrition Colloquium. 14, Hanovre, Allemagne, 27 Juillet 2001/3 Août 2001.

Résumé : A new technology was used to estimate root-length density and root exploration from root counts (grid method) on soil profiles. This method includes a computer model, developed by Chopart and Siband (1999). This model called "RACINl" was previously validated under African conditions, and then validated in the Colombian eastern plains. The results indicate that the drastic reduction in the development of maize roots at the anthesis phase is related to the presence of physical and chemical restrictions, which were enhanced as depth increased. Between 20 and 30 cm profile depth extreme adverse conditions for the growth of roots existed in both cultivars. Organic matter additions to the soil stimulated root development only in the top soil. Penetration resistance was 1.33 Mpa in the subsurface soils. This suggests that the severe inhibition of root growth in the subsoil was related to soil compaction and additionally to aluminium toxicity caused by increased aluminium saturation (>28%). Increasing Al supply with profile depth was associated with lower availability of nutrients particularly of phosphorus (P), potassium (K), magnesium (Mg) and calcium (Ca).

Mots-clés Agrovoc : Zea mays

Mots-clés géographiques Agrovoc : Colombie

Classification Agris : F62 - Physiologie végétale - Croissance et développement
U10 - Informatique, mathématiques et statistiques

Auteurs et affiliations

• Roveda-Hoyos G., CORPOICA (COL)
• Chopart Jean-Louis, CIRAD-AMIS-AGRONOMIE (REU)
• Baquero José, CORPOICA (COL)
• Rojas Leyla Amparo, CORPOICA (COL)
• Dingkuhn Michaël, CIRAD-AMIS-AGRONOMIE (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/545518/)

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