Articles

Adaptation of VegSyst model to open air lettuce crops to be used in a decision support system

Article number
1150_53
Pages
379 – 384
Language
English
Abstract
The simulation model VegSyst was parameterized and verified for an open-air lettuce (Lactuca sativa L.) crop.
Parameterization was performed with data of a field experiment conducted in California in 1994 (Gallardo et al., 1996) and verification with experiments conducted in Cordoba (Spain) in 2002 and Granada (Spain) in 2011. Daily dry matter production (DMP) was calculated from the product of a) the daily intercepted radiation and the radiation-use efficiency (RUE), and b) the daily crop transpiration and the transpiration-use efficiency (TUE), the lowest being selected.
N uptake and evapotranspiration were calculated as in the original version of the model.
A RUE of 2.1 g MJ-1 PAR and a TUE of 3.83 g m-2 mm-1 were obtained.
Initial and maximum kc values were 0.4 and 1.1, respectively.
Once parameterized, VegSyst accurately simulated dry matter production, N uptake and evapotranspiration of lettuce crops under open-air conditions.
This adaptation can be integrated into the VegSyst-DSS to broaden its application to outdoors crops.

Publication
Authors
C. Giménez, T. García-López, E.M. Suárez-Rey, M. Gallardo, C.O. Stöckle
Keywords
N management, irrigation, Lactuca sativa, outdoors crops
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