RESUMOVisou-se neste estudo, realizar o ajuste do modelo de estimativa do desenvolvimento de populações de soja e da variação do índice de área foliar para a variedade IAS 5. (R1); at the beginning of seed filling (R5), and at the beginning of maturation (R7). The minimum and maximum temperatures were obtained daily. After the adjustment of the genetic coefficients, the model was formatted using the program Stella 5.0. The soy development model presented a suitable performance, precise estimates from the original data. The leaf area index model also presented satisfactory estimation.Key words: mathematical modeling, photothermic constant, meteorological variables 1 Trabalho parcialmente financiado pela FAPERGS e que compõe parte da Dissertação de Mestrado do primeiro autor
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