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Master Thesis

Modélisation du coefficient apparent d'utilisation de l'azote issu d'un engrais minéral apporté sur blé tendre d'hiver

Abstract : The economic context and environmental transfer hazard lead to limit using of synthetic N fertilizer. To maintain current production levels, improving the fertilizer efficiency appears as a tangible solution. Nitrogen Use Efficiency (NUE) is the right indicator to quantify the fertilization effectiveness. Previous works suggest the harvest stage NUE is determined at fertilization application date by: the growth rate of the culture (GR), rainfall, Nitrogen Nutrition Index (NNI) and the fertilizer form (Limaux 1999, Recous 1997, Souder et al., 2007). From these assumptions, we need to establish an explanatory model of NUE. 38 trials were conducted by Arvalis - Institut du végétal from 2004 to 2006, located in France, sown with winter wheat (Triticum aestivum) and exposed to variable fertilization application. Following the biomass evolution and plant nitrogen content it is possible to determine: NUE, the GR from growth kinetics adjustments, NNI, and rainfall. The explanatory model adjustment highlights the fertilizer form role. Rainfall, by modulating the dissolution of nitrogen fertilizer in interaction with the GR and NNI explain NUE. The results variability within large-scale trials reduces the predictive power of the relationship and underline the requirement to characterize the environment in future experimentations.
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Master Thesis
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Submitted on : Thursday, October 11, 2012 - 3:10:46 PM
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François Collin. Modélisation du coefficient apparent d'utilisation de l'azote issu d'un engrais minéral apporté sur blé tendre d'hiver. Sciences agricoles. 2012. ⟨dumas-00741001⟩

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