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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Item Comparison between climatological and field water balances for a coffee crop(Escola Superior de Agricultura "Luiz de Queiroz", 2007-05) Bruno, Isabeli Pereira; Silva, Adriana Lúcia da; Reichardt, Klaus; Dourado-Neto, Durval; Bacchi, Osny Oliveira Santos; Volpe, Clóvis AlbertoThe use of climatological water balances in substitution to complete water balances directly measured in the field allows a more practical crop management, since the climatological water balances are based on data monitored as a routine. This study makes a comparison between these methods in terms of estimatives of evapotranspiration, soil water storage, soil available water, runoff losses, and drainage below root zone, during a two year period, taking as an example a coffee crop of the variety Catuaí, three to five years old. Climatological water balances based on the estimation of the evapotranspiration through the methods of Thornthwaite and Penman-Monteith, can reasonably substitute field measured balances, however underestimating the above mentioned variables.Item Variability of water balance components in a coffee crop in Brazil(Escola Superior de Agricultura "Luiz de Queiroz", 2006-03) Silva, Adriana Lúcia da; Roveratti, Renato; Reichardt, Klaus; Bacchi, Osny Oliveira Santos; Timm, Luis Carlos; Bruno, Isabeli Pereira; Oliveira, Julio César Martins; Dourado Neto, DurvalEstablishing field water balances is difficult and costly, the variability of their components being the major problem to obtain reliable results. This component variability is presented herein for a coffee crop grown in the Southern Hemisphere, on a tropical soil with 10% slope. It was observed that: rainfall has to be measured with an appropriate number of replicates; irrigation can introduce great variability into calculations; evapotranspiration, calculated as a remainder of the water balance equation, has exceedingly high coefficients of variation; the soil water storage component is the major contributor in error propagation calculations to estimate evapotranspiration; and that runoff can be satisfactorily controlled on the 10% slope through crop management practices.