Influence de quelques agrosystèmes lorrains sur la qualité des eaux : cas des eaux de captage de la commune de Loisy-54

Abstract : In agricultural areas, the pollution of aquifers by nitrates is caused especially by the mineralization of soil organic matter. This phenomenon is aggravated by farming practices that use organic or mineral fertilizers to achieve maximum yield. During five years, the nitrate levels in top-soil layer (Ap and subsequent lavers) of a clayey-calcareous soil were measured. The amounts of these nitrates non immobilized by soil or by crops come directly to a mini-watersheb supplying a water-catchment of the commune of Loisy (54). The nitrate contents of water were, for several years beyond the target content of 50 mg/l (CEE norm) to range between 65 and 75 mg/l. Therefore, an attempt was made to explain the relationship between the contents of nitrates in soil and in drainage water measured weekly. In parallel, the influence of the buryinf of the straw and an intercrop culture using rape to catch the nitrates was studied during the intercrop period on bare soil. The overall balance of this work explained clearly the necessity to know the real supply of native mineral nitrogen. Nitrogen fertilizers applications should be made accounting for local climatic conditions and particularly the different stages of the development of plant crop
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1991_LONGA_N.pdf
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https://hal.univ-lorraine.fr/tel-01752144
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Submitted on : Thursday, March 29, 2018 - 1:33:14 PM
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Norbert Longa. Influence de quelques agrosystèmes lorrains sur la qualité des eaux : cas des eaux de captage de la commune de Loisy-54. Autre. Institut National Polytechnique de Lorraine, 1991. Français. ⟨NNT : 1991INPL093N⟩. ⟨tel-01752144⟩

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