https://socictopen.socict.org/files/original/f2213b54f15a5464fac14a34ae7e890d.pdf 454874f095cca7ca7ad650ace9e22111 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Avaliação de materiais orgânicos empregados como fertilizantes Evaluation of organic materials used as fertilizers Creator An entity primarily responsible for making the resource J.C. Alcarde, A.A. Rodella Description An account of the resource Discutiram-se os critérios de avaliação de materiais orgânicos empregados como fertilizantes adotados na legislação brasileira atual. Trabalhando com amostras de compostos, estéreos, resíduos industriais e turfa, discutiu-se a determinação de carbono orgânico através de oxidação pelo íon dicromato. Sugeriu-se que o atual método de determinação de matéria orgânica total por combustão tenha sua utilização restrita ou desaconselhada, devido aos erros grosseiros que proporciona. Como forma de se avaliar a qualidade de materiais orgânicos, discutiu-se a determinação da capacidade de retenção de cátions (CTC) em fertilizantes e materiais orgânicos em geral. O grau de maturação ou estabilidade de compostos orgânicos pôde ser convenientemente expresso através da relação entre CTC (meq/l00g) e o teor de carbono orgânico expresso em porcentagem.The present paper aimed to study the determination of organic carbon and the cation exchange capacity (CEC) of organic materials which can be used as fertilizers. Analytical procedures recommended by Brazilian official methods of fertilizer analysis include the determination of total organic matter by incineration. The errors of this method are not taken into account in spite of the great variability of the organic materials. This paper suggests that the organic characteristics of organic fertilizers must be expressed by the organic carbon content as determined by wet oxidation with dichromate ion and sulfuric acid. There is a great demand for practical indexes for determining the state of composting since the incorporation into the soil of immature organic material can cause severe damage to crops. In order to evaluate the maturity of organic products as manures, compost industrial wastes and peat, the determination of CEC was discussed. It seems possible to define the chemical stabilization of organic materials on the basis of the relationship between CEC and organic carbon content. The analytical procedures employed proved to be suitable for routine analysis. Date A point or period of time associated with an event in the lifecycle of the resource 1994 Subject The topic of the resource Carbono orgánico, Compost, Organic carbon, capacidade de troca de cátions, cation exchange capacity, compostos, fertilizante orgânico, organic fertilizers, peat, turfa, waste Identifier An unambiguous reference to the resource within a given context 10.1590/S0103-90161994000300030 Source A related resource from which the described resource is derived Scientia Agricola Publisher An entity responsible for making the resource available Universidade de São Paulo Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General) Relation A related resource <a href="http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S0103-90161994000300030" target="_blank" rel="noreferrer noopener">http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S0103-90161994000300030</a>