Cantú, Rafael Ricardo creator Visconti, Alexandre creator Morales, Rafael Gustavo Ferreira creator Schallenberger, Euclides creator text periodical abstract or summary bl. continuing por Resumo – O conhecimento sobre o uso de remineralizadores do solo, constituídos por farelos ou pós de rochas silicatadas, vem sendo intensamente demandado por meio de editais de pesquisas e pelas cadeias produtivas da agricultura. O potencial de uso dos remineralizadores associados a compostos orgânicos (CO) é uma das principais demandas de estudo. Considerando que no Vale do Itajaí em Santa Catarina o pó de varvito (PV) e os compostos de resíduos de agroindústrias são encontrados abundantemente, tornam-se necessários estudos com a associação destes materiais. Assim, o objetivo do trabalho foi avaliar no solo o efeito da mistura do CO e PV na mineralização do N e na disponibilidade de macronutrientes. O experimento foi realizado em incubação controlada onde foram misturadas no solo, cinco doses do PV (0, 5, 10, 20 e 40Mg ha-1) ao CO (30Mg ha-1), além do tratamento somente com o solo. A adição do pó do PV em doses acima 5Mg ha-1 afeta a mineralização de N do CO, reduzindo a amonificação, intensificando a nitrificação e ocasionando menores teores de N mineral total no solo no decorrer da incubação. Os outros macronutrientes avaliados não sofreram alterações, indicando a ausência de contribuição do PV nesses atributos. Termos de indexação: Compostagem; Pó de rocha; Nutrição de plantas Abstract – The demand for knowledge on the use of soil remineralizers containing silicate rock crumbs or powders has been constantly increasing. The potential use of remineralizers associated with organic compounds (CO) is one of the main demands for study. Considering that in the Itajaí Valley in Santa Catarina, varvite powder (PV) and agro-industrial waste compounds are found abundantly, studies are needed on the associati on of these materials. Thus, the objective of the work was to evaluate the effect of the mixture of CO and PV on N mineralization and macronutrient availability in the soil. The experiment was carried out in a controlled incubation where five doses of PV (0, 5, 10, 20 and 40Mg ha-1) and CO (30Mg ha-1) were mixed into the soil, in additi on to the treatment with soil alone. The additi on of PV powder in doses above 5 Mg ha-1 aff ects the mineralizati on of N from CO, reducing ammonifi cati on, intensifying nitrification and causing lower levels of total mineral N in the soil during incubation The other macronutrients evaluated did not change, indicating the absence of contribution from PV in these att ributes. The potenti al use of remineralizers associated with organic compounds (CO) is one of the main demands for study. Considering that in the Itajaí Valley in Santa Catarina varvite powder (PV) and agro-industrial waste compounds are found abundantly, studies are needed with the association of these materials. Thus, the objective of the work was to evaluate the effect of the mixture of CO and PV on N mineralization and macronutrient availability in the soil. The experiment was carried out in a controlled incubation where five doses of PV (0, 5, 10, 20 and 40Mg ha-1) and CO (30Mg ha-1) were mixed into the soil, in addition to the treatment with soil alone. The addition of PV powder in doses above 5 Mg ha-1 aff ects the mineralization of N from CO, reducing ammonification, intensifying nitrification and causing lower levels of total mineral N in the soil during incubation. The other macronutrients evaluated did not change, indicating the absence of contribution from PV in these attributes. Index terms: Composting; Rock dust; Plant nutrition Publicação online; 13 ref.; 3 tables; Summaries (En, Pt) ANÁLISE DO SOLO NUTRIÇÃO VEGETAL MACROELEMENTO COMPOSTAGEM Florianópolis-SC Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina 1988- 2024-3836 0103-0779 BR2025005464 v.. 37(1) p.. 71-76; (2024) https://publicacoes.epagri.sc.gov.br/rac/article/view/1803/1670 https://publicacoes.epagri.sc.gov.br/rac/article/view/1803/1670 BR-BrBNA 260119 20260119151040.0 por