The effect of two tillage systems on some soil properties in a subhumid Entic Hapludoll of Argentina

Ana Miglierina P.1, Maria Landriscini R.2, Juan Galantini S.3, Ramón Rosell C.2 y Julio Iglesias G.1

The effect of two tillage systems (no-tillage, SO, and conventional tillage, LC) on some soil physical and chemical properties in an typic Entic Hapludoll (loam texture, mixed and mesic) of the SW subhumid region of the Province of Buenos Aires, Argentina, after three cultivation years was studied. Soil samples, were obtained from a plot seeded with oat (Avena sativa)-vicia (Vicia sativa) and sunflower (Helianthus annus) under the two tillage systems. Sampling was done every 0.05 m up to a depth of 0.20 m. Organic carbon (OC), total nitrogen (Nt), C:N ratio, pH, extractable P (Pe), nitrates (N-NO3-) moisture percentage and bulk density were determined. OC, Nt and Pe increased under SD, the small increment of C:N was related to accumulation of surface residues. SD caused a marked Pe accumulation in 0-0,05 m in layer. Results show a general positive effect of SD on LC in the plowinglayer (0-0,20 m) regardless of the short time since the experiment was initiated.

Keywords: no-tillage, chemical soil properties, Argentina.
1 Laboratorio de Humus (LAHBIS), Dpto. Agronomia, Universidad Nacional del Sur (UNS), Bahia Blanca, Argentina.
2 Consejo Nacional de Investigaciones Cientificas y Técnicas (CONICET), Bahia Blanca, Argentina.
3 Comisión de Investigaciones Científicas (CIC), Depto. Agronomia, Universidad Nacional del Sur (UNS), Bahia Blanca, Argentina.