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Variability of water balance components: a case study of a coffee crop (Coffea arabica L.) grown in Brazil The establishment of field water balances is difficult and costly, the variability of its components being the major problem to obtain reliable results. This component variability is here presented for a coffee crop grown in the Southern Hemisphere, on a tropical soil with 10% slope. It is concluded that rainfall has to the measured with an appropriate number of replicates, that irrigation can introduce great variability into calculations, that evapotranspiration calculated from the water balance equation has high coefficients of variation, that the soil water storage component is the major contributor in error propagation calculations, and that the run-off could be satisfactorily controlled through crop management practices.

Variabilidade dos componentes do balanço hídrico: um estudo de caso em uma cultura do cafeeiro (Coffea arabica L.) no Brasil