Soil organic C and N fractions under continuous cropping with contrasting tillage systems on mollisols of the southeastern Pampas

Domínguez, Germán Franco; Diovisalvi, Natalia Verónica; Studdert, Guillermo Alberto; Monterubbianesi, María Gloria

doi:10.1016/j.still.2008.07.020

Cited by 66 publications

(63 citation statements)

References 27 publications

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“…Voorhees and Lindstrom (1984) suggested that 3 to 4 years are required for the soils with reduced tillage to be able to develop a more favorable porosity in the first 15 cm, which would be closely related to the biological activity and proportion of plant residues. In contrast, in another long-term experiment conducted in Argentina, no statistically significant differences in δ b due to time were reported (Domínguez et al, 2009).…”

Section: Bulk Density (δ B )mentioning

confidence: 77%

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Soil physical quality changes under different management systems after 10 years in the Argentine humid pampa

Costa¹,

Aparicio²,

Cerdà³

2015

Solid Earth

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Abstract. South American countries with the highest surface of land under no-tillage (NT) management are Brazil, Argentina and Chile. In Argentina, 78.5 % of the agricultural land is cropped under NT management. Several experiments have confirmed the improvements in soil aggregation and infiltration achieved by NT management in dry-land farming areas associated with increases of bulk density (δ b ) under NT management. An increase in bulk density implies a reduction of the macro and mesoporosity that is in contradiction with the increased infiltration that occurs at macro and mesopores. We hypothesize that the increase of bulk density in NT management mainly affects the mesopores. We evaluated the evolution of the soil physical parameters in three management systems in four farmers' fields. We found that the reduction in total porosity under NT management is mainly a product of a reduction in the percentage of mesopores in the soil. In this work, the results indicate a modification of some soil physical parameters (porosity, near-saturated hydraulic conductivity, soil structure) due to uninterrupted agricultural production, but the management system did not affect the yields of crop.

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Section: Bulk Density (δ B )mentioning

confidence: 77%

“…In the southeast of the humid pampa, Domínguez et al (2009) have reported that the SOC content expressed both as concentration and as stock, was not affected by the tillage systems. Moreover, after 11 years of cropping under MP management, Studdert and Echeverría (2000) found a decrease in the soil SOC content.…”

Section: Soil Organic Carbon (Soc)mentioning

confidence: 97%

Soil physical quality changes under different management systems after 10 years in the Argentine humid pampa

Costa¹,

Aparicio²,

Cerdà³

2015

Solid Earth

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“…In recent works Diovisalvi et al (2008) and Domínguez et al (2009) determined that there are slightly changes in some properties of the soil related to the soils sustainability between CT and NT. It can be then concluded that in the study region tillage systems only caused slight effects on soil macrofauna while some effects on the Enchytraeidae populations.…”

Section: Discussionmentioning

confidence: 99%

Tillage system does not affect soil macrofauna in southeastern Buenos Aires province, Argentina

Manetti

López

Clemente

et al. 2010

Span. j. agric. res.

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Soil degradation increased incessantly in the Pampas region of Argentina, due to the intensification of agricultural activities, when carried out with conventional tillage (CT) systems. No-tillage system was adopted as conservation practices by the farmers. The objectives of this study were: a) to determine the macrofauna taxa and their relative abundance under CT and NT in two different seasons; and b) to evaluate soil tillage and seasonal effects on the density of the main macrofauna taxa. The study was conducted from 2002 to 2004 in 46 production farms, in Balcarce, Argentina. Ten soil monoliths (25.2 cm side; 30 cm depth) ramdomly directed field at July-August; and at OctoberNovember to determine the number of individuals of macrofauna and Enchytraeidae. Soil macrofauna density did not differ between tillage systems. Oligochaeta Megadrilli density was generally not affected by the tillage system (P > 0.05) except in 2004 when it was greater under CT in July-August (P = 0.0002). Chilopoda density was greater in soils under NT, with significant differences in 2002 in October-November (P = 0.0070). In July-August of 2003 it was higher in CT (P = 0.0109). Diplopoda were more abundant only under NT in July-August 2004 (P = 0.0010). In July-August a significantly (P < 0.05) higher density of Enchytraeidae was found in CT than NT fields. No differences were observed in the taxonomic composition and the relative abundance of the macrofauna when comparing CT and NT. It can be then concluded that in the study region tillage systems affected slightly soil macrofauna and significantly Enchytraeidae.Additional key words: abundance, conventional tillage, no-tillage, soil invertebrates. ResumenEl sistema de labranza no afecta a la macrofauna en el sudeste de la provincia de Buenos Aires, ArgentinaEn la región pampeana argentina se ha producido una creciente degradación del suelo debido a la intensificación de las actividades agrícolas llevadas a cabo con sistemas de labranza convencionales (LC). Los agricultores, como práctica conservacionista, han adoptado la siembra directa (SD). Los objetivos de este estudio fueron determinar los taxa de la macrofauna y su abundancia relativa bajo LC y SD en dos estaciones diferentes y evaluar los efectos de los sistemas de labranza y estaciones sobre la densidad de los principales taxa de la macrofauna. El estudio fue llevado a cabo desde 2002 hasta 2004 en 46 lotes de producción en Balcarce, Argentina. En cada lote se tomaron diez muestras de suelo al azar (de 25,2 cm de ancho y 30 cm de profundidad) en julio-agosto y octubre-noviembre para determinar el número de individuos de la macrofauna y de los Enchytraeidae. La densidad de la macrofauna no difirió entre sistemas de labranza. La densidad de Oligochaeta Megadrilli no fue afectada por el sistema de labranza (P > 0,05), excepto en 2004 cuando fue mayor bajo LC en julio-agosto (P = 0,0002). La densidad de Chilopoda fue mayor bajo SD, aunque solo se observaron diferencias significativas en octubre-noviembre de 2002 (P = 0,007...

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“…Crops used in the rotation had a significant impact on the rate of SOC loss [46] which was primarily associated with the amount of C returned through crop residues input [61,62]. Under continuous grain cropping, adoption of NT resulted in reduced losses, or even increases in SOC and POC in shallow soil layers (0-5 cm) regardless of fertilizer management [60,[62][63][64][65], or agricultural intensification levels [66]. However, none of these studies reported improvements in SOC or POC due only to the adoption of NT or to fertilization when the 0-20 cm depth soil layer was taken into account.…”

Section: Developing Cropping Systems For Sustained Grain Yield Maintmentioning

confidence: 99%

Soil Quality Impacts of Current South American Agricultural Practices

et al. 2015

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Soil organic C and N fractions under continuous cropping with contrasting tillage systems on mollisols of the southeastern Pampas

Cited by 66 publications

References 27 publications

Soil physical quality changes under different management systems after 10 years in the Argentine humid pampa

Soil physical quality changes under different management systems after 10 years in the Argentine humid pampa

Tillage system does not affect soil macrofauna in southeastern Buenos Aires province, Argentina

Soil Quality Impacts of Current South American Agricultural Practices

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