Resumo

GOMES DE ANDRADE, Juliano et al. Water losses by evaporation in corn with conventional and zero tilling for different levels of dead covering. I. experimental results. Rev Cie Téc Agr [online]. 2011, vol.20, n.2, pp.60-64. ISSN 2071-0054.

The aim of this experiment was to measure the water loss by evaporation in a crop of maize cultivated in two tillage systems; conventional tillage and zero tillage with dead covering. The experiments were developed on the experimental area belonging to the Department of Rural Engineering, Federal University of Santa Maria, RS-Brazil in the period November-December 2006, since the initial stage of maize crop until the foliar area index reached values of the 2,7. Soil moisture was measured with TDR in the depths of 0-10 and 10-30cm. Three treatments with zero tillage were studied having three levels of dead coverage represented by 0, 3 and 6 t/ha of dry oat straw and a fourth treatment of conventional soil preparation. The results demonstrated a water savings of around 40% when zero tillage is used with dead coverage.

Palavras-chave : Corn evapotranspiration; zero tillage.

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