Resumo

DENOIA, Julio et al. Descriptive analysis of the evolution of the technological models prevalent in Zavalla District (Santa Fe), from an energetic perspective. Cienc. docencia tecnol. [online]. 2006, n.33, pp.209-226. ISSN 1851-1716.

In the socio-economic and technological evolution of the agroecosystems of the pampean region in the last 30 years three productive models can be recognized: the agriculturization model, an intermediate one characterized by the launch of no till modality and transgenic soybean (RR gene), and the current model with high potential yield crops, consolidation of the no till system as well as the increasing use of agrochemicals. These technological models induced modifications in the agroecosystems feasible of being analyzed through energetic parameters, due to the tight association between the energy consumption, the agroecosystems productivity and the intensification of agriculture. Since 1970 there was a rise in the amount of energy employed by the agroecosystems, while the energetic efficiency remained high owed to the increase in the registered yields. Wheat turned out to be the least energetically efficient crop. The present technological model results in the highest labour yield.

Palavras-chave : Energy; Technological model; Energy balance.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )