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Elaboration du rendement et fertilisation azotée du blé d’hiver en Champagne crayeuse. III. - Influence des variations pédologiques ; conséquences pour la conduite de la culture

Abstract : In two previous papers, we presented the experimental design and methods chosen to study winter wheat in Champagne crayeuse, and discussed the range of applicability of the predictive balance method for determining nitrogen fertilization rates. In this paper, we attempt to define the basis of crop management at the plot scale, including nitrogen fertilization. In a region where soils are very different, although over the same geological substratum, we had to analyse the effects of this variability on the yield elaboration process. Chalky soils, In the first part, we describe the 112 plots studied, which are distributed within 11 types according to their profile morphology (table 1). The main differences between the soil-types concern (a) temperature conditions (table 3) and (b) root depth and consequent variations in available water content. In the second part, we analyse the consequences of this pedological variability on the growth of winter wheat. Root depth is critical to explain the response of winter wheat to the mineral nitrogen content remaining in the soil in late winter (fig. 1). The growth-limiting effect of low temperatures in the « white soils » class is shown. Consequences for timing and split application of nitrogen fertilizers are discussed. We also analyse water supply and potential yield as influenced by the soil profile (fig. 3 and 4). In the third part, we propose a classification regrouping the elementary soil types in land-use classes, homogeneous for crop behaviour and accordingly, for advisory purposes (table 6).
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Jean Boiffin, Jean Marc Meynard, Michel Sebillotte, Jacques Caneill. Elaboration du rendement et fertilisation azotée du blé d’hiver en Champagne crayeuse. III. - Influence des variations pédologiques ; conséquences pour la conduite de la culture. Agronomie, EDP Sciences, 1982, 2 (5), pp.417-428. ⟨hal-02726362⟩

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