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The first models of temporal variation of root systems appeared over 20 years ago. The complex architectural geometry of root systems; the wide range in size and diameter and the rapid growth and decomposition of finest roots; the different physiological activity of roots of different ages; the complex microbial processes occurring at the root-soil interface; the symbiotic relationships in the rhizosphere; the variable soil environment (physical, chemical and biological) in which roots develop are the challenges of quantifying the root growth. The models are not simple mechanisms to archive information in order to produce forecasts. Modeling represents a better way of synthesizing knowledge about different components of a system, summarizing data, and transferring research results to users. Os primeiros modelos que contemplaram a variação espacial e temporal de sistemas radiculares foram apresentados há mais de 20 anos. A complexa arquitetura dos sistemas radiculares; a ampla faixa de variação no tamanho e no diâmetro, bem como no rápido crescimento e decomposição de raízes finas; as diferentes atividades fisiológicas das raízes de diferentes idades; os complexos processos microbiológicos que ocorrem na interface raiz-solo; as relações simbióticas na rizosfera; as variações químicas, físicas e biológicas que ocorrem no solo (local onde as raízes se desenvolvem) são os desafios da quantificação do crescimento radicular. Os modelos não são simples mecanismos para arquivar informações, produzindo estimativas. Os modelos representam o melhor mecanismo de sintetizar conhecimento sobre diferentes componentes do sistema, arquivando dados de forma sintética, e transferindo resultados de pesquisa para os usuários

scientia agrícola

Principles of crop modelling and simulation: III. modeling of root growth and other belowground processes, limitations of the models, and the future of modeling in agriculture