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All publications of “Rosa Maria Vargas Castilhos”

10 results

Humic Substances and Chemical Properties of an Acrisol Amended with Vermicomposted Vegetal and Animal Residues

Rul Martins Antunes, Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos ORCID logo , Danilo Dufech Castilhos, Robson Andreazza, Raí Augusto Schwalbert

13/May/2019

ABSTRACT Vermicomposted vegetal and animal residues are rich in nutrients and humic substances and thus can be applied to the soil as a source of functionalized organic matter (OM) and as an alternative to chemical fertilizers. In Southern Brazil, many animal and vegetal residues are easily accessible. Therefore, this study aimed to evaluate alterations in soil chemical properties and OM chemical composition in response to the application of local vermicomposted residues. The vermicomposts of: cattle manure (CM), sheep manure (SM), […]

Initial Recovery of Organic Matter of a Grass-Covered Constructed Soil after Coal Mining

Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos, Luiz Fernando Spinelli Pinto, Eloy Antonio Pauletto, Elisa Souza Lemes and, Roberta Jeske Kunde

28/Jun/2016

ABSTRACT Revegetation is essential to improve the quality of constructed soils. This study investigated effects of perennial grasses on total organic carbon (TOC) stock, organic matter (OM) fractions and on quality of a recently constructed soil, after coal mining. Soil samples were collected from the 0.00-0.03 m layer two years after the beginning of the experiment. The treatments consisted of Cynodon dactylon cv vaquero (T1); Urochloa brizantha (T2); Panicum maximun (T3); Urochloa humidicola (T4); Hemarthria altissima (T5); Cynodon dactylon cv […]

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, [...]

01/May/2015

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 […]

Organic Matter Fractions and Quality of the Surface Layer of a Constructed and Vegetated Soil After Coal Mining. II – Physical Compartments and Carbon Management Index

Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos, Eloy Antonio Pauletto, Luiz Fernando Spinelli Pinto, Clenio Nailto Pillon, Letiane Helwig Penning, [...]

01/May/2015

Soils constructed after mining often have low carbon (C) stocks and low quality of organic matter (OM). Cover crops are decisive for the recovery process of these stocks, improving the quality of constructed soils. Therefore, the goal of this study was to evaluate the effect of cover crops on total organic C (TOC) stocks, C distribution in physical fractions of OM and the C management index (CMI) of a soil constructed after coal mining. The experiment was initiated in 2003 […]

Root morphology and potassium uptake kinetic parameters in irrigated rice genotypes

Fernanda San Martins Sanes, Rosa Maria Vargas Castilhos, Walkyria Bueno Scivittaro, Ledemar Carlos Vahl, Júlia Rodegheiro de Morais

01/Jun/2013

The efficiency of uptake of a nutrient by plants is a function of their physiological and morphological properties, which may vary between cultivars of the same species. A study was carried out to determine root morphology and kinetic parameters of potassium (K) uptake in rice genotypes. The experiment was conducted in a laboratory and the plants cultivated in pots under artificial light. Treatments were represented by 11 rice genotypes (Avaxi, BRS Atalanta, BRS Bojuru, BRS Fronteira, BRS Querência, CNA 10754, […]

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

01/Oct/2011

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 […]

Soil properties, dry matter of maize after application of anaerobic sludge from the sewage treatment sation of rice parboiling waste water

Giúlia D'Avila Vieira, Danilo Dufech Castilhos, Rosa Maria Vargas Castilhos

01/Apr/2011

The residue of the process of parboiling rice contains high amounts of elements such as nitrogen, phosphorus and others which, once incorporated into the soil, could serve as a source of nutrients. Accordingly, the present study evaluated some properties of an Ultisol, the dry matter production and nutritional status of corn grown after applying an anaerobic sludge originated from the process of parboiling rice. The experiment was conducted in 4 kg pots filled with soil, in four replications. The following […]

Soil microbial attributes after application of anaerobic sludge from a sewage treatment station of parboiled rice

Giúlia D'Avila Vieira, Danilo Dufech Castilhos, Rosa Maria Vargas Castilhos

01/Apr/2011

Rice, grown in all Brazilian regions, is particularly important in the southern region, where 60 % of the total production of this cereal is raised. The rice parboiling process is a hydrothermal treatment of partially cooking the grains in the husk, improving the nutritional value. This process results in an effluent rich in organic matter and nutrients, which can be used as organic fertilizer in agriculture. In this sense, this study aimed to evaluate the quality of a soil based […]

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, [...]

01/Aug/2009

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, [...]

01/Dec/2008

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 […]