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Soil management, featuring techniques that make possible great sustainability, aims at soil recuperation and sustainability, greater productivity and greater economic gain to the producer. Soil fertility (phosphorus, potassium, organic matter, pH) is evaluated with regard to depth of samples and soil and crop preparation * Engenheira Agrônoma. Mestrado em Ciências ambientais pelo Programa de Pós-Graduação em Ciências Ambientais. Docente do Ensino básico, técnico e tecnológico do Instituto Federal de Educação, Ciência e Tecnologia de Rondônia, Brasil. E-mail: nirvani.henrique@ifro.edu.br ** Engenheiro Agrônomo. Doutorado em Ciência do Solo pela Universidade Federal do Rio Grande do Sul. Docente Adjunto da Universidade Federal de Rondônia, Brasil. *** Engenheira Agrônoma. Doutorado em Desenvolvimento Regional e Meio Ambiente pela Fundação Universidade Federal de Rondônia. Docente da Universidade Federal de Rondônia, Brasil. 864 Sistemas e sucessões de cultivos na fertilidade de um solo da região da Amazônia Rev. Agro. Amb., v. 11, n. 3, p. 863-877, jul./set. 2018 ISSN 1981-9951 e-ISSN 2176-9168 systems. Experiment was undertaken in Red-Yellow Latisol and a sub-subdivided split scheme was adopted. Soil preparations comprised (1) PRT – traditional preparation (plowing grid and two level grids); (2) PRA – alternative preparation (subsoil); (3) PDA – zero tillage with alternative preparation every four years; (4) PDC – continuous zero tillage. Crop sequence was the second factor employed, namely: (1) SF: soybean beans; (2) MF: corn bean; (3) SM: soybean corn; 4) MM: corn corn. PRT and PDC presented lower fertility rate at the soil surface layer. PRT presented less amounts of phosphorus, potassium and organic matter; pH had lower rates in PDC and PRT.

SISTEMAS E SUCESSÕES DE CULTIVOS NA FERTILIDADE DE UM SOLO DA REGIÃO DA AMAZÔNIA