Programa de Pós-graduação em Agronomia

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Navegando Programa de Pós-graduação em Agronomia por Por Área do CNPQ "CIENCIAS AGRARIAS::AGRONOMIA::AGROMETEOROLOGIA"

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    Caracterização das regiões produtoras de feijão-comum baseada no risco climático
    (Universidade Federal de Goiás, 2024-02-28) Justino, Ludmilla Ferreira; Matta, David Henriques da; http://lattes.cnpq.br/0274497958438413; Heinemann, Alexandre Bryan; http://lattes.cnpq.br/0452123469996239; Heinemann, Alexandre Bryan; Stone, Luis Fernando; Battisti, Rafael; Cuadra, Santiago Vianna; Alves Júnior, José
    The aim of this study was to define the climatic risks of yield loss in common bean and identify and classify the regions producing this grain in Brazil, through computer simulation, functional data analysis and machine learning tools. Simulations were carried out with the CSM-CROPGRO-Dry Bean model for different municipalities, sowing dates and growing seasons (wet, dry and winter). To define the yield loss, the loss curves were calculated by season, year and municipality, based on simulated yield. Subsequently, the curves were grouped using functional K-means and a functional average loss curve was established to explain the behavior of each group of municipalities. To identify and classify homogeneous common bean production regions, K-means and decision tree machine learning techniques were used to, respectively, group homogeneous environments based on simulated yield and associate environmental covariates with homogeneous environments. In general, during the wet season, the delay in sowing contributed to the increase in common bean yield. At later dates (between 10/dec and 30/dec) yield loss of less than 20% were observed. During the dry season, the delay in sowing caused a reduction in yield, mainly in the Central-West and Southeast regions, with the loss exceeding 70% (10/mar). At these seasons, water stress was the main factor in yield losses. In winter, yield varied less markedly between sowing dates. The use of irrigation at this time provides smaller loss in yield (< 20%), although air temperature is a limiting factor for the expansion of common bean cultivation.