Comparing MACRO 4.3 with 5.0 for simulating the fate of chloridazon and lenacil in a clayey soil of southwest Spain.
2003
Cuevas Sánchez, Mª Victoria | Fernández Luque, José Enrique | Roulier, S. | Calderón Reina, María Jesús | Hermosín, M.C. | Stenemo, F. | Larsbo, M. | Jarvis, N. J. | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
The performance of the FOCUS version of the MACRO model (4.3) in simulating the fate and mobility of two herbicides (chloridazon and lenacil) in a clay soil cropped with sugar beet was compared with that of the latest version 5.0. In addition to field experiments, laboratory experiments-with undisturbed soil columns were carried out to evaluate tracer transport and the fate and mobility of the two herbicides. Additional laboratory erperiments were carried out to establish the degradation and sorption properties of the herbicides. The measured profiles of soil water and herbicide contents were compared with the values simulated by the two versions of tre model, after calibrating the most sensitive parameters with a sequential uncertainty domain parameter fitting procedure (SUFI). The experiments showed little indication of macropore flow. This was attributed to the fine tilth in the seedbed produced by tillage. Both model versions gave reasonably good predictions', but the estimated values of some parameters were quite different. This was attributed to small differences between the models in process descriptions (e.g. soil hydraulic functions) and numerical solution methods, combined with the effects of subjective choices made during an inverse parameter optimisation procedure that was insufficiently constrained by data.
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