Resumo -O objetivo deste trabalho foi analisar os benefícios e as perspectivas potenciais de sistemas de integração lavoura-pecuária no processo de intensificação de uso das áreas em exploração com lavoura de grãos e pastagens no Cerrado, e apontar as principais lacunas de informação sobre o sistema. Os principais benefícios da integração lavoura-pecuária são: melhoria das propriedades químicas, físicas e biológicas do solo; redução da ocorrência de doenças, insetos-pragas e plantas daninhas; maior produtividade das plantas e dos animais; e redução de riscos pela diversificação de atividades. No entanto, a adoção do sistema de integração lavoura-pecuária ainda é pequena, provavelmente em virtude da maior complexidade desse sistema. Concentrar esforços nos fatores que limitam a adoção desse sistema no Cerrado parece ser um ponto estratégico para novos estudos. A busca por melhoria na qualidade de cobertura de solo para o sistema plantio direto, por meio de gramíneas forrageiras, pode auxiliar na adoção da integração lavoura-pecuária no Cerrado. A expectativa é de que a adoção de sistemas de integração lavoura-pecuária resulte em melhorias significativas na sustentabilidade socioeconômica e ambiental das propriedades e da sua região de influência.Termos para indexação: agrossilvipastoril, consórcio de culturas com forrageiras, matéria orgânica do solo, plantio direto. Integrated crop-livestock systems in the Cerrado regionAbstract -The objective of this work was to analyze the benefits and the potential prospects of integrated crop-livestock systems in the process of crop and pasture intensification in the Cerrado, and to point out the main information gaps about the system. The main benefits of crop-livestock integration are: improved chemical, physical and biological properties of the soil; reduction of diseases, pests and weed outbreaks occurrence; higher crop and animal productivity; and risk reduction due to diversification of activities. However, the adoption of the crop-livestock system is still low, probably due to the greater complexity of the system. Concentrating efforts on the factors that limit the system's adoption is strategic for new studies. The search for better soil cover for the no tillage system, through forage grasses, can boost the adoption of integrated crop-livestock in the Cerrado. It is expected that the adoption of integrated crop-livestock systems improve the socioeconomic and environmental sustainability of the farm and of its region of influence.Index terms: agrisilvipasture, crop-pasture association, soil organic matter, no tillage. IntroduçãoA demanda crescente por alimentos, bioenergia e produtos florestais, em contraposição à necessidade de redução de desmatamento e mitigação da emissão de gases de efeito estufa, requer soluções que permitam incentivar o desenvolvimento socioeconômico, sem comprometer a sustentabilidade dos recursos naturais. A intensificação do uso da terra em áreas agrícolas e o aumento da eficiência dos sistemas de produção podem contribuir para harmonizar ess...

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The presence of trees in silvopastoral systems causes changes in the microclimate of the understory where there is the cultivation of forages. This study evaluated the forage dry mass and the structural characteristics of Piatã grass under two densities of trees in a silvopastoral system, in contrast to a treeless area in the rainy and dry seasons of the Brazilian savannah region, so called Brazilian Cerrado. The forage was Brachiaria brizantha cv. BRS Piatã and the tree species was the eucalyptus (Eucalyptus grandis  E. urophylla) planted in the North-South direction in the treatments: forage grown in treeless area (control); forage grown in eucalyptus understory with spacing between rows of 22 m (SSP22); forage grown in eucalyptus understory with spacing between rows of 12 m (SSP12). The experimental design was a randomized complete block with three replications and evaluations conducted from April 2013 to April 2014. There was a reduction in cumulative dry mass and in accumulation rate of Piatã grass in silvopastoral system in the rainy season and the Western side suffered greater interference from trees during this season. For every 1% reduction in photosynthetically active radiation occurred a decrease of 1.35% in the forage dry mass, corresponding to 42.8 kg ha À1. The structural characteristics of Piatã grass have changed in both dry and rainy seasons in silvopastoral system. The spacing between rows of Eucalyptus greater than 22 m is less damaging for pasture productivity when the trees of the silvopastoral system are planted in North-South direction. 2016 Elsevier B.V. All rights reserved.

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-The objective of this work was to evaluate the dynamics of soil microbiological attributes under integrated production systems, continuous pasture, and native cerrado. The study was conducted in a transition area from crop to livestock. Four areas with different land uses were evaluated: an integrated crop-livestockforestry system (ICLFS), cultivated with Eucalyptus urograndis alley cropping, spaced 2x2 m between plants and 22 m between alleys; an integrated crop-livestock system (ICLS

Despite the agricultural importance of Indian Black Earth (IBE) in the Amazon region, there are few studies that report on the relation between soil texture and chemical fertility of IBE. These soils of pre-Colombian origin, with high contents of P, Ca and other nutrients are found across the Amazon valley. IBE profiles were studied to evaluate the total contents of P, its primary chemical forms and the P transformation phases in areas with IBE soils of variable texture and in adjacent reference soils. The soil texture strongly influenced soil fertility, changing in terms of transformation of the primary P forms and, consequently, predominant P forms in IBE. Soils with texture varying between clay and heavy clay had higher total P contents and primary Ca-P forms. Highest P-Al and lowest total P amounts were observed at the site Rio Preto da Eva, where texture varies from sandy loam to sandy clay loam. In the IBE with clay texture the amounts of soluble P, extracted with NH4Cl were highest, although different from Mehlich 1-extractable amounts.

RESUMO -O crescimento em diâmetro à altura do peito (DAP), altura e volume foi avaliado em plantas de clone de Eucalyptus grandis, submetidas a diferentes intensidades de desrama artificial (altura de 1,0; 1,5; e 2,0 m a partir do solo) e idades de aplicação da primeira intervenção de desrama (20 e 28 meses de idade), em Abaeté, MG. A segunda intervenção de desrama em todos os tratamentos foi realizada aos 33 meses de idade, até atingir 3 m de altura do fuste da planta. Aos 40 meses de idade, observou-se que a desrama artificial não afetou, significativamente (p>0,05), o crescimento em DAP, altura e volume das plantas submetidas à primeira intervenção de desrama aos 20 meses, porém afetou o DAP e o volume quando a primeira intervenção foi realizada aos 28 meses de idade. Observou-se rápida recuperação da copa das plantas desse clone, independentemente do tratamento de desrama. Considerando não ter havido diferença entre tratamentos para o crescimento das plantas que tiveram a primeira intervenção aos 20 meses de idade e que os galhos vivos ainda apresentavam diâmetro reduzido e praticamente não existiam galhos mortos por ocasião da primeira intervenção nessa idade, recomenda-se a aplicação da desrama nesse clone, na região de cerrado, aproximadamente, aos 20 meses de idade, visando obter madeira de melhor qualidade para serraria. Palavras-chave: Desrama artificial, crescimento e clone de Eucalyptus grandis. GROWTH OF PRUNED Eucalyptus grandis [HILL ex MAIDEN] CLONES IN THE SAVANNAH REGION, BRAZIL ABSTRACT -The growth in diameter at breast height (DBH), height and volume was evaluated in clones of

The aim of this study was to evaluate the litter dynamics in the seasons of the year in three areas: Forest formation Cerradão (CE), and in two hybrids stands of Eucalyptus urophylla × E. grandis with different ages: E1 (34-58 months) and E2 (58-82 months). The produced litter, stored litter and the remaining mass was collected over 720 days. The evaluation of the remaining litter mass in each area was performed from the random distribution of 648 litter bags on the soil. Chemical analyzes (N, P, C) and the structural components of the cell wall (lignin, cellulose and hemicellulose) of the remaining litter were performed. The C of the litter stock was also determined. For both years of evaluation were observed higher biomass and C content in litter at E2. In contrast, the highest decomposition rate was for the CE, especially in the second year of evaluation (mass remaining at 720 days of 35%, 37% and 23% for E1, E2 and CE, respectively), attributed to the higher apparent liberation of N, soil moisture and biodiversity in the native area. Lignin contents increased, cellulose decreased, and hemicellulose remained stable throughout the 720 days. It was also observed an increase in the N and P concentration of the remaining mass and positive correlations among the remaining mass and the C:N and C:P ratios. The C:N ratio of litter was ≥ 76:1 at time 0 and ≥ 30:1 at 720 days for the three areas.