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Variability of water balance components in a coffee crop in Brazil

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Author(s): Silva Adriana Lúcia da | Roveratti Renato | Reichardt Klaus | Bacchi Osny Oliveira Santos | Timm Luis Carlos | Bruno Isabeli Pereira | Oliveira Julio César Martins | Dourado Neto Durval

Journal: Scientia Agricola
ISSN 0103-9016

Volume: 63;
Issue: 2;
Start page: 105;
Date: 2006;
Original page

Keywords: component variability | rainfall | evapotranspiration | soil water storage

ABSTRACT
Establishing 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.

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