ABSTRACT Agroecological management is considered a model of sustainable agriculture that offers social, environmental and economic benefits. The hypotheses of this study were that agroecological production systems can promote changes in the physical fractions of soil organic matter (SOM) associated with aggregates of different origins, and that the greater diversity of plant species in the production system may favour an increase in the carbon concentration of these aggregates. The aim of this study was to a) determine the mass of the free light fraction (FLF), intra-aggregate light fraction (ILF) and light organic matter fraction (LOM) of biogenic and physiogenic soil aggregates; and b) quantify the organic carbon content of the three light SOM fractions and the residual particulate SOM fraction. Five production systems were evaluated: AgF - Agroforestry system; CSun - Coffee grown in full sun; CSha - Coffee grown in shade; FLE - Flemingia grown in alleys; and NT - No-tillage. The aggregates were separated, identified and classified according to their origin or formation pathway into biogenic (formed by biological processes) or physiogenic aggregates (resulting from chemical and physical actions). From these, the mass and carbon content of the FLF, ILF, LOM and residual particulate fractions were quantified. The greater diversity of plant species found in the AgF system has not yet favoured an increase in the carbon content of the aggregates. The longer set-up time and the management practices of the CSun system has led to an increase in the carbon content of the organic fractions of the aggregates (3.44-1.63 g kg-1 for C-LOM; 1.93-1.13 g kg-1 for C-FLF). The lowest overall mean values for LOM and ILF were found mainly in the aggregates of the NT system (1.22-1.67 and 1.55-2.20 g kg-1, respectively), being associated with the shorter time and greater mobilisation of the arable layer. Biogenic aggregation afforded the highest overall mean values for LOM, and increased the mass of the light fractions (15.5%-27.8% for FLF; 23.4%-8.0% for ILF) and the carbon in the C-LOM, C-FLF and residual particulate fractions (42.3%, 12.9%, and 35.0%, respectively) in the surface layer, suggesting an improvement in soil quality.

RESUMO Este estudo tem como objetivo descrever uma experiência em formação continuada realizada em parceria com professores no intuito de apresentar possibilidades que valorizem as práticas como eixo formativo na relação de colaboração e parceria entre Universidade e Educação Básica. O processo formativo foi pautado pela perspectiva da investigação-formação das práticas produzidas pelos docentes em seu cotidiano escolar, no sentido de contribuir para produção de políticas de formação continuada que aproximem a Universidade e a Educação Básica e, também, que valorize a coautoria e a corresponsabilidade do professor nesse processo. Trata-se de uma pesquisa qualitativa do tipo narrativa (auto)biográfica. Utiliza entrevista, redes de conversações, questionário e observação participante como instrumentos de produção dos dados. As análises remetem à necessidade de estabelecer pontes de diálogo e relações colaborativas dentre os diversificados interesses inseridos nas formações, qual seja, o da pesquisa, o das redes municipais de educação e o dos professores, ao assumir as suas experiências profissionais como referências formativas.

ABSTRACT This study describe an experience of continuing education in partnership with teachers. It aimed to provide opportunities that value the practices as a formative axis in partnership between the University and Basic Education. The formative process was guided by the perspective of the research-formation of practices produced by teachers in their school routine, to contribute to production continuing education policies that bring the University and Basic Education and also that values co-authoring and teacher responsibility in this process. This is a qualitative study of the self-biographical narrative type, uses interviews, networking conversations, questionnaires and participant observation as instruments of data production. The analyzes indicate the need to build bridges of dialogue and collaborative relationships among diverse interests inserted into formations, namely, the research, the municipal education networks and the teachers, to take their professional experiences as formative references.