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Publicado: 16 de mayo de 2013
No tillage in rainfed Aragon: Effect on organic carbon in the soil surface horizon
Siembra directa de secano en Aragon: Efecto sobre la materia orgánica en el primer horizonte del suelo
AbstractConservation tillage has been encouraged as a management alternative to preserve soil and water resources in semiarid Aragon (NE Spain). In fact, its adoption by farmers, and especially of notillage (NT) systems, has increased in recent years. However, little information concerning the soils on which these techniques are applied is available for this region. The objective of this study was toassess the potential of NT to increase organic carbon content at the soil surface (0–20 cm) in rainfed Aragon. To this aim, 22 pairs of adjacent farm fields under NT and conventional tillage (CT) werecompared in different cereal production areas. The fields were under continuous NT between 5 and 19 years but half were over 10 years. Soil organic carbon (SOC) in NT ranged from 7.06 to18.53 g kg−1 (0–20 cm depth) and was higher than 12 g kg−1 in nearly 30% of the fields. These contents represented between 8% less (only one case) and 55% more SOC under NT than under CT with an average gain of 20% infavour of NT. The highest SOC contents were found in the NT fields of longer duration (>10 years) and/or managed with practices that enhance the return of more crop biomass to the soil (completeresidue return, cropping intensification and manure application). The identification of the current management practices used by farmers has allowed us to know the diversity of the NT-based croppingsystems and the reality of the conservation agriculture in our region. Overall, results from this on-farm study indicate that NT can be recommended as a viable alternative to CT to increase organic carbonat the soil surface in cereal production areas of Aragon.
Información general: (Color rojo)
Objetivo: (color verde)
Evaluar el potencial de la Siembra Directa para incrementar el contenido...
Siembra directa de secano en Aragon: Efecto sobre la materia orgánica en el primer horizonte del suelo
AbstractConservation tillage has been encouraged as a management alternative to preserve soil and water resources in semiarid Aragon (NE Spain). In fact, its adoption by farmers, and especially of notillage (NT) systems, has increased in recent years. However, little information concerning the soils on which these techniques are applied is available for this region. The objective of this study was toassess the potential of NT to increase organic carbon content at the soil surface (0–20 cm) in rainfed Aragon. To this aim, 22 pairs of adjacent farm fields under NT and conventional tillage (CT) werecompared in different cereal production areas. The fields were under continuous NT between 5 and 19 years but half were over 10 years. Soil organic carbon (SOC) in NT ranged from 7.06 to18.53 g kg−1 (0–20 cm depth) and was higher than 12 g kg−1 in nearly 30% of the fields. These contents represented between 8% less (only one case) and 55% more SOC under NT than under CT with an average gain of 20% infavour of NT. The highest SOC contents were found in the NT fields of longer duration (>10 years) and/or managed with practices that enhance the return of more crop biomass to the soil (completeresidue return, cropping intensification and manure application). The identification of the current management practices used by farmers has allowed us to know the diversity of the NT-based croppingsystems and the reality of the conservation agriculture in our region. Overall, results from this on-farm study indicate that NT can be recommended as a viable alternative to CT to increase organic carbonat the soil surface in cereal production areas of Aragon.
Información general: (Color rojo)
Objetivo: (color verde)
Evaluar el potencial de la Siembra Directa para incrementar el contenido...
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