Resumen

BASANTA, M  y  ALVAREZ, C. Manejo sustentable de sistemas agrícolas en la región central de Córdoba: una experiencia de largo plazo en INTA EEA Manfredi. RIA. Rev. investig. agropecu. [online]. 2015, vol.41, n.2, pp.215-222. ISSN 1669-2314.

The main environmental limiting factor for rainfed agriculture in the central region of Cordoba is water availability, so that any management practice promoting soil water captation, storage and conservation will result in higher crop productivity and yields of the soil-crop system. A long term field trial on a Haplustoll soil in the center of Córdoba province was sampled to evaluate the effect of different tillage and crop sequence systems on soybean and maize yields, initial available soil water, crop residues and soil carbon stocks. Mean soybean yields for the 1997-2014 period was significantly higher under no-tillage with soybean-corn sequence, and lower under monocropping and reduced tillage. Maize yield was significantly higher under no-tillage (SD) than under reduced tillage (LR) and under no-tillage with cover crop (SDcc), with no differences between the last. Under soybean initial soil available water was significantly higher in no-tillage treatments including grasses in crop sequences (SM-SDcc, SM-SD and SS-SDcc). The carbon stock was significantly higher under no-tillage and the SM sequence (SM-SD and SM-SDcc). Results show that in the central region of Cordoba no-tillage contributes to increase crop yields and soil carbon stock, which is associated to a better soil water condition.

Palabras clave : No tillage; Yield; Soybean; Maize; Soil C stock; Available soil water.

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