Resumo

CARFAGNO, Patricia Fabiana et al. Agua disponible en monocultivo de soja con cultivos de cobertura y barbechos reducidos en la región semiárida y subhúmeda Pampeana. Cienc. suelo [online]. 2013, vol.31, n.1, pp.67-87. ISSN 1850-2067.

In subhumid and semiarid environments, the main factor affecting water loss from the soil surface is evaporation. This process can be reduced by using cover crops (CC) that increase transpiration and potentially reallocate evaporated water to plant transpiration. The aim of this work was to study the water dynamics under cropping systems (SC) with continuous soybean in two soil great groups, four CC and three fallow lengths. We studied four CC and three drying times under two soils, a Haplustol and a Hapludol, evaluating the available water depth (LAD) for two years. For the Hapludol, in general, the LAD at soybean planting rotated with CC was greater than or equal to the SC under continuous soybean. In the Haplustol, the LAD at soybean planting was greater only in the SC with the late-dried CC rye when compared to the continuous soybeans SC. We conclude that the water dynamics under continuous soybean is affected by the inclusion of CC, where rye is the best species adapted to these environments.

Palavras-chave : Water use efficiency; Fallow efficiency; Soil water.

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