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| Titel |
The use of soil mechanical properties to evidence the effect of cultivation practives on soil structure |
| VerfasserIn |
V. Chaplain, P. Défossez, G. Delarue, G. Richard, J Roger-Estrade, D. Tessier |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026435
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| Zusammenfassung |
| The use of soil mechanical properties to evidence the effect of cultivation practices on soil structure
Véronique Chaplain1, Pauline Défossez2, Gislaine Delarue1, Guy Richard3, Jean Roger-Estrade4 and Daniel Tessier1
1 UR INRA PESSAC RD 10 F-78026 Versailles cedex
2 UMR INRA/URCA FARE, 2 Esplanade Roland Garros, BP 224 F-51686 Reims cedex 2
3 UR INRA Sols 2163 Avenue de la Pomme de Pin - CS 40001 ARDON F-45075 Orléans Cedex 2
4 AgroParisTech, département SIAFEE - BP 01 F-78850 Thiverval-Grignon
Corresponding author : chaplain@versailles.inra.fr
In this study, we proposed to use mechanical properties of soils deduced from compression curves as characteristics of soil structure to trap the effects of cultivation practices, especially in alternative tillage systems. Mechanical parameters studied were the pre-compressionstress and the compression index Cc classically related to physical properties of soils such as texture, water content and bulk density. All compression curves were performed at pF 2.5. In the loamy soils, sampled in two locations of the French Parisian basin, this value corresponds to water content at which compaction risk is maximum. We systematically compared the mechanical behaviour of remoulded and undisturbed soils samples. On both sites cultivation practices did not change the linear relationship of Cc with the initial void ratio. Thus this parameter can be used to predict the intrinsic sensitivity of soil to compaction. On the contrary, the relationship observed between the pre-compression pressure and the initial void ratio on remoulded samples disappeared and no correlation was observed in both situations. This result suggests that for a given soil, pre-compression pressure is sensitive to the initial soil structure of the undisturbed samples and therefore can be used as an indicator of the effects of cultivation practices on soil structure. |
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