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RESUMO - Os teores de Mn, Fe, Zn, Cu, Co, Mo e Pb dos solos, das forrageiras predominantes nas pastagens e da água foram estudados nas regiões Norte e Noroeste do Estado do Rio de Janeiro, nas épocas seca (junho-julho) e chuvosa (dezembro-janeiro) do ano. Amostras de solo, forrageiras e água foram coletadas em 12 diferentes locais das regiões, em áreas onde predominam pastagens, identificadas por fotos obtidas por satélite e de acordo com as diferentes características dos solos. Os teores de minerais das amostras foram determinados por espectrometria via plasma, após preparados os extratos. Em ambas épocas, foram encontrados baixos níveis de Cu e Zn nas amostras de forrageiras e o teor de minerais variou com o tipo de solo. Os teores de Fe e Mn das forrageiras foram superiores às exigências dos bovinos, e deficiências de Cu e Zn foram encontradas. Os teores de Co nas forrageiras foram superiores às exigências dos bovinos. Os microelementos analisados na água foram, em geral, muito baixos, quando comparados com os níveis de segurança. Os teores de minerais das amostras de água analisadas estão dentro dos níveis de segurança para os animais domésticos. ABSTRACT ¾ The contents of Mn, Fe, Zn, Cu, Co, Mo and Pb of soil, predominant forage in the pastures and water, were studied in the North and Northwest regions of Rio de Janeiro State, during the dry (June-July) and rainy (December-January) seasons. Samples of soil, forage and water were collected in 12 different points of the regions, in predominant grazing areas, as determined by satellite photograph and according to different soil characteristics. The mineral contents of the sample extracts were determined by spectrometry, on a inductive plasma emission source apparatus. In both seasons it was found low levels of Cu and Zn in forage samples and the mineral contents of forages varied with the type of soil. The levels of Fe and Mn were higher than the requirements and deficiencies of Cu and Zn were found. The cobalt contents of forages were higher than cattle requirements. The analyzed microelements in water usually were very low when compared with the safety levels. It was concluded that the mineral contents in the water analyzed samples were within the safety margin for domestic animals

revista brasileira de zootecnia

Composição mineral das pastagens das regiões norte e noroeste do Estado do Rio de Janeiro: 2. Manganês, ferro, zinco, cobre, cobalto, molibdênio e chumbo