Recommandations specifiques d'engrais: Calibration et validation du module phosphore du modele NuMaSS

Doumbia, M D and Sidibe, A and Bagayoko, A and Diarra, M A and Bationo, A and Kablan, R A and Yost, R S and Hossner, L R and Hons, F M (2003) Recommandations specifiques d'engrais: Calibration et validation du module phosphore du modele NuMaSS. African Crop Science Journal, 11 (1). pp. 17-25. ISSN 1021-9730

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Abstract

Fertiliser recommendations in Mali as well as in many other countries of West Africa were made according to Chaminade's method. For socio-economic reasons, correcting deficiency rates of major nutrients were vulgarized. These blanket recommendation, when applied, lead to a continuous soil nutrient mining. The objective of this research was to calibrate and validate the P module of NuMass. Laboratory incubations were conducted to calibrate the P buffering coefficients used by the P module. Rates of N, P and lime predicted by NuMass model, considered as specific recommendations, were compared to the blanket recommendations in the field in order to validate them. The buffer coefficients were inversely proportional to the clay content. The buffering coefficient of sandy soils of Cinzana/Mali (0.73) and Kollo/Niger P3 (0.63) were higher compared to the clayey soils of Longorola-bf (0.22) and Kollo/Niger (0.21). Generally, buffering coefficients obtained by laboratory incubation (0.60) tended to be lower than the estimated coefficient by the P module NuMass (0.67). The range of the used soil texture (1.5-54.6 % clay) showed that the buffering coefficients estimated by the P module of NuMass were correct for flooded soils. Grain yield of different trials and tests do not indicate the expected higher performance of specific recommendations of fertilisers from NuMass model compared to the used blanket recommendation (1624 and 1582 kg ha-1 of maize; respectively)

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Buffering capacity, fertilizer recommendation, model Pouvoir tampon, recommandation d'engrais, modèle
Subjects: Others
Depositing User: Ms K Syamalamba
Date Deposited: 27 Dec 2011 03:48
Last Modified: 14 Sep 2013 11:58
URI: http://oar.icrisat.org/id/eprint/5116
Official URL:
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: UNSPECIFIED
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