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Caractérisation du réservoir utilisable des sols et évolution en fonction des successions culturales

Résumé : To grow, the plants need, water and mineral nutrients, that are taken from the soil. Soil structure, which determines the transfer of water and nutrients, thus influences root development. However, it could be possible that root growth affects the structure and properties of the soil water. The first objective of this study was therefore to analyse the effect of different crop sequences on the Available Water Content (AWC) of the first two horizons of a soil. Laboratory measurements of water content at field capacity and permanent wilting point were performed on soil samples taken from the SOERE ACBB Lusignan whose plots present series of crops / grasslands of varying durations. We showed that after eight years from the beginning of the experiment, the soils under different crop sequences have the same water content at permanent wilting point, but not at field capacity, which leads to values of different AWC values. The soils that were continuously cultivated either with grain or with grasslands exhibited AWC values lower than those grown alternately in cereals and in grassland. These differences in AWC were large enough so that i) the dynamics of the water content in the soil, ii) the annual drainage at the base of the soil and iii) the crop yield, all the three estimated over a crop cycle by the STICS model, were significantly different. The second objective of this work concerned the selection of water potentials at field capacity and permanent wilting point. We have shown that the water contents were not significantly different at pF4,2 and pF4,22, but were significantly different for pF2, pF2,5 and pF2,7.
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https://hal.inrae.fr/hal-02810588
Déposant : Migration Prodinra <>
Soumis le : samedi 6 juin 2020 - 08:38:27
Dernière modification le : vendredi 12 juin 2020 - 10:43:26

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  • HAL Id : hal-02810588, version 1
  • PRODINRA : 207160

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Florian Bourgeois. Caractérisation du réservoir utilisable des sols et évolution en fonction des successions culturales. Autres régions du monde. Université François Rabelais (Tours), FRA. 2013, 40 p. ⟨hal-02810588⟩

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