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At the invitation of Dr. Alessandro Antônio Fortunato, professor of the Department of Plant Science at UFRR, Dr. José Carlos Vieira de Almeida, director of Laborsolo, was present to give the lecture “Liming and Gypsum for Roraima Soils: Challenges and Solutions” which was held at the Opening of the Soybean Harvest in the Cerrado of Roraima in September 2018.