Improved modeling of maize canopywater loss: a case study in Brazil
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Abstract
The precise determination of water loss from plant canopies is important formonitoring crop water usage and for many agricultural management operationsrelated to water use planning. The aim of this study was to estimate water lossfromsunlit and shaded fractions of a maize (Zea mays L.) canopy, under well-watered conditions, using the Penman-Monteith energy balance equation. Esti-mated values were validated by a heat pulse system, which was used to mea-sure stem sap flow and by a weighing lysimeter. Water loss was corrected toaccount for the effect of row structure in the early stages of maize. Resultsshowed that estimated transpiration of the shaded canopy ranged from 30% to45% for total transpiration, under fluctuation of atmospheric demand. Hourlyand daily estimations of transpiration showed good agreement with lysimeterand heat pulse measurements.
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