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All publications of “Otávio dos Anjos Leal”

6 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 […]

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 […]

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 […]