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All publications of “Carla Machado da Rosa”

6 results

Emissions of Nitrous Oxide and Methane in a Subtropical Ferralsol Subjected to Nitrogen Fertilization and Sheep Grazing in Integrated Crop-Livestock System

Jonatas Thiago Piva ORCID logo , Laércio Ricardo Sartor, Itacir Eloi Sandini, Anibal de Moraes, Jeferson Dieckow, Cimélio Bayer, [...]


ABSTRACT Brazilian agriculture contributes significantly to nitrous oxide (N2O) and methane (CH4) emissions, so the understanding of such emissions at the field is crucial for mitigation strategies. This study quantified the impact of N application and sheep grazing on the N2O and CH4 emissions from a subtropical Ferralsol under an integrated crop-livestock (ICL) management system. In a long-term experiment in southern Brazil, gaseous fluxes were measured during a year-long cycle of ryegrass (Lolium multiflorum) plus oats (Avena sativa) winter pasture […]

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Soil CH4 and N2O Emissions from Rice Paddy Fields in Southern Brazil as Affected by Crop Management Levels: a Three-Year Field Study

Tiago Zschornack, Carla Machado da Rosa, Cecília Estima Sacramento dos Reis, Gabriel Munhoz Pedroso, Estefânia Silva Camargo, Daiane Carvalho dos Santos, [...]


ABSTRACT Rice yield increases in response to improvements in crop management, but the impact on greenhouse gas (GHG) emissions in the subtropical region of Southern Brazil remains unknown. A three-year field study was developed aiming to evaluate the impact that an increase in crop management levels (high and very high) has on soil methane (CH4) and nitrous oxide (N2O) emissions, as compared to the level (medium) currently adopted by farmers in Southern Brazil. Differences in crop management included seed and […]

Organic Matter Fractions and Quality of the Surface Layer of a Constructed and Vegetated Soil After Coal Mining. I – Humic Substances and Chemical Characterization

Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos, Eloy Antonio Pauletto, Luiz Fernando Spinelli Pinto, Flávia Fontana Fernandes, Letiane Helwig Penning, [...]


After open coal mining, soils are “constructed”, which usually contain low levels and quality of organic matter (OM). Therefore, the use of plant species for revegetation and reclamation of degraded areas is essential. This study evaluated the distribution of carbon (C) in the chemical fractions as well as the chemical characteristics and humification degree of OM in a soil constructed after coal mining under cultivation of perennial grasses. The experiment was established in 2003 with the following treatments: Hemarthria altissima […]

Content of soil organic carbon in albaqualf soil: influence of irrigated rice management

Carla Machado da Rosa, Rosa Maria Vargas Castilhos, Eloy Antonio Pauletto, Clenio Nailto Pillon, Otávio dos Anjos Leal


On paddy soils in the southern region of the State of Rio Grande do Sul, Brazil, irrigated (flooded) rice is grown on 1´000´000 ha, under different soil management systems. The influence of poor drainage and alternating oxidation and reduction cycles on the content of soil organic carbon is still poorly understood. This long-term study (21 years) was conducted in Capão do Leão, RS, Brazil, to evaluate the effect of irrigated rice management systems on soil organic carbon stocks and physical […]

Effect of humic-like substances on potassium uptake kinetics, plant growth and nutrient concentration in Phaseolus vulgaris L.

Carla Machado da Rosa, Rosa Maria Vargas Castilhos, Ledemar Carlos Vahl, Danilo Dufech Castilhos, Luiz Fernando Spinelli Pinto, Elisandra Solange Oliveira, [...]


Humic substances can influence plant metabolism direct or indirectly, thus modifying its growth. The objective of this study was to evaluate the effect of humic-like substances (HS) on kinetics of K uptake, nutrient concentration and growth of common bean (Phaseolus vulgaris, L.). The experiment was performed on a laboratory bench with controlled light conditions. Plants were grown in pots with complete nutrient solution enriched with five levels (0; 2.5; 5; 10 and 20 mg L-1 of C) of alkaline soluble humic-like substances […]

Distribution and characterization of humic substances in animal and plant vermicompost

Rosa Maria Vargas Castilhos, Deborah Pinheiro Dick, Danilo Dufech Castilhos, Tânia Beatriz Araújo Gamboa Morselli, Paula Fernanda Pinto da Costa, Wagner Bertuol Casagrande, [...]


The use of organic residues as fertilizers and soil conditioners requires their maturation and the quality monitoring of the final product. Vermicomposting is a technique which, along with the composting process, eliminates the potential harmful effect of manure residues to human health and soil. The stability and maturity degrees of a given vermicompost are usually inferred from the quantity and quality of the humic substances in the resulting compost. This study aimed to evaluate the quality and maturity of vermicomposts […]