Resumo

TAHER, Hernan Ignacio; APARICIO, Virginia Carolina; COSTA, José Luís  e  PURICELLI, Marino. Evaluación de propiedades edáficas en distintos estados de cultivo de soja. Cienc. suelo [online]. 2013, vol.31, n.1, pp.57-65. ISSN 1850-2067.

The increasing predominance of soybeans in crop rotations, without the proper presence of cereals and under scarce or null fertilizer applications has been causing soil physical and chemical degradation. In addition, conventional tillage followed by intense rainfall events in southeastern Buenos Aires maximizes the risk of soil erosion. The adoption of conservation tillage practices in the region could help solve these problems. The aim of this study was to evaluate the evolution of physical properties and organic matter content during the soybean growing season under no- tillage and vertical tillage, under two N rates, 0 kg N ha-1 and 150 kg N ha-1 applied to the previous crop. The experiment was conducted from November 2009 until August 2010, in a Typical Argiudol soil complex. Soil samples were taken at planting, 60 days after planting (60 dap) (in vegetative stages), 100 dap (in reproductive stages) and 280 dap (after harvest). The following soil properties were determined: organic matter content, change of mean weight diameter and bulk density. Tillage systems and previous N fertilization rates had no effect on soybean yields. No negative correlations were found between organic matter and bulk density. The results of this study are relevant because we were able to follow the physical parameters during the soybean crop cycle in southeastern Buenos Aires, providing information that did not exist before. Results are expected to be confirmed from the soilanalyses of more crop cycles in this long-term experiment.

Palavras-chave : Physical soil properties; Tillage systems; Fertilization history.

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