Modelling evapotranspiration of corn (Zea mays) under different plant densities
2003
Gardiol, J.M. | Serio, L.A. | Della Maggiora, A.I.
Simulating evapotranspiration (ET) from agricultural crops requires models capable of describing energy partitioning over the entire range of crop cover, between bare soil and a full canopy. Double-layer models can satisfy this requirement. A double-layer model that calculates soil evaporation and plant transpiration in a parallel approach is proposed. Its performance is compared with the Penman-Monteith and the Shuttleworth-Wallace ET model performances, against ET measurements from a corn crop obtained by soil water balance during 1995/96 at Balcarce, Argentina. Corn grew at two different plant densities (22,000 and 91,000 pl ha-1), reaching maximum leaf area indexes (L) of 1.5 and 5.5, respectively. The soil evaporation component was weighted by a factor considering crop cover. Predicted and measured values fit better when the new model was applied.
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