Mathison, M. N., Chanasyk, D. S. and Naeth, M. A. 2002. Longevity of deep ripping effects on Solonetzic and associated soils. Can. J. Soil Sci. 82: 259-264. The longevity of deep ripping effects on Solonetzic soils was investigated at 11 field sites in eastcentral Alberta after a period of 15 to 20 yr. Select soil properties and crop yield of deep-ripped and non-ripped control plots were analyzed. Dryland yield data of wheat, barley, oats and canola were assessed for 10 of the 11 sites over a 16-yr time period. Select soil properties were analyzed once in 1998 with penetration resistance (PR) evaluated again in 1999. A significant difference in penetration resistance was found between the deep ripped versus control treatments (P ≤ 0.05). There were no significant treatment differences for soil texture, bulk density (Db), pH, electrical conductivity (EC) or sodium adsorption ratio (SAR). A significant yield difference between the deep ripping and control treatments (for all crop species) was found for 6 of 10 sites (P ≤ 0.10), with all sites having an increase in mean yield for the majority of years evaluated. Generally, sites in the drier ecoregions had smaller yield increases than those in the wetter ones. Hence some beneficial effects from deep ripping remain for a long time period. On remarque une différence significative entre la résistance à la pénétration des sols défoncés et des sols intacts (P ≤ 0,05). Le défonçage n'entraîne aucune variation significative au niveau de la texture du sol, de la masse volumique apparente, du pH, de la conductivité électrique et du ratio d'adsorption du sodium. Le rendement varie de façon significative entre les sols défoncés et intacts (pour toutes les cultures) à six endroits sur dix (P ≤ 0,10), le rendement moyen étant plus élevé à tous les sites, la majorité des années de l'évaluation. Dans l'ensemble, la hausse de rendement dans les régions écologiques plus arides est inférieure à celle observée dans les régions plus humides. Les bienfaits du défonçage en profondeur durent donc relativement longtemps.
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