Assessing the soil color by traditional method and a smartphone: a comparison by Gabriela de Castro Raulino, Lucas de Sousa Oliveira, Icaro Vasconcelos Nascimento, Cillas Pollicarto da Silva, Márcio Godofrêdo Lobato, Thiago Leite Alencar, Raul Shiso Toma, Francisca Gleiciane da Silva, Jaedson Cláudio Mota

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