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All publications of “Jeferson Dieckow”

18 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, [...]

14/Jun/2019

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 […]

Visual Abstract

Influence of Organic Matter on Mean Size of Clay Minerals in Basalt Soils in Southern Brazil

Daniel Hanke, Vander de Freitas Melo, Jeferson Dieckow, Deborah Pinheiro Dick, Itamar Antônio Bognola

01/Dec/2015

ABSTRACT The interaction of organic compounds with clay minerals can change the size of crystals. However, in soils this effect is still unclear because of limitations in separation of pure mineral phases for conducting dissolution experiments. In this study, the relationship between soil organic matter (SOM) and mean crystallite size (MCS) of clay minerals from surface and subsurface horizons of soils from a toposequence in Southern Brazil was evaluated. Soil C and N contents were determined and the nature of […]

Sheep Excreta as Source of Nitrous Oxide in Ryegrass Pasture in Southern Brazil

Michely Tomazi, Emanuelle Cavazini Magiero, Joice Mari Assmann, Tatiane Bagatini, Jeferson Dieckow, Paulo Cesar de Faccio Carvalho, [...]

01/Sep/2015

ABSTRACT Livestock urine and dung are important components of the N cycle in pastures, but little information on its effect on soil nitrous oxide (N2O) emissions is available. We conducted a short-term (39-day) trial to quantify the direct N2O-N emissions from sheep excreta on an experimental area of ryegrass pasture growing on a Typic Paleudult in southern Brazil. Four rates of urine-N (161, 242, 323, and 403 kg ha-1 N) and one of dung-N (13 kg ha-1 N) were applied, […]

EFFICIENCY OF THE DENSE SOLUTIONS IN PHYSICAL FRACTIONATION OF SOIL ORGANIC MATTER

Paulo Cesar Conceição, Madalena Boeni, Cimélio Bayer, Jeferson Dieckow, Julio Cesar Salton, Cecilia Estima Sacramento dos Reis

01/Mar/2015

The mechanisms of stabilization of organic matter (OM) have been studied in Brazilian tropical and subtropical soils; however, few studies have evaluated the influence of the methodological part of the use of the solutions in the results. The aim of this study was to evaluate the efficiency of two salt solutions (1.8 kg dm-3 sodium iodide – NaI, and 2.0 kg dm-3 sodium polytungstate – SPT) in separation of densimetric soil organic matter (SOM) fractions in two soils (Acrisol from […]

ESTIMATE OF RAINFALL EROSIVITY IN PARANA, BRAZIL, BY THE PLUVIOMETRY METHOD: UPDATING WITH DATA FROM 1986 TO 2008

Paulo Cesar Waltrick, Marco Aurélio de Mello Machado, Jeferson Dieckow, Dalziza de Oliveira

01/Jan/2015

Three estimates of rainfall erosivity in the State of Parana, Brazil, were carried out in the 1980s and 1990s, but none afterwards. The objectives of this study were to update information, as a fourth estimate, on rainfall annual erosivity for Parana, with rainfall data from 1986-2008; and to generate information on monthly erosivity in order to identify its seasonal distribution. We used the pluviographic and pluviometric methods of erosivity determination. The first served to revalidate previous correlation equations between erosivity […]

Three-dimensional interpolation of soil data: fertility and pedomorphological features in southern Brazil

Tales de Campos Piedade, Vander de Freitas Melo, Luiz Cláudio de Paula Souza, Jeferson Dieckow

01/Aug/2014

The graphical representation of spatial soil properties in a digital environment is complex because it requires a conversion of data collected in a discrete form onto a continuous surface. The objective of this study was to apply three-dimension techniques of interpolation and visualization on soil texture and fertility properties and establish relationships with pedogenetic factors and processes in a slope area. The GRASS Geographic Information System was used to generate three-dimensional models and ParaView software to visualize soil volumes. Samples […]

Carbon and nitrogen in the particle size fractions of soil organic matter in crop systems under no-tillage

Bruna Raquel Winck, Fabiane Machado Vezzani, Jeferson Dieckow, Nerilde Favaretto, Rudimar Molin

01/Jun/2014

Soil quality in no-till systems is related to the crop systems and may be evaluated through particulate organic matter (>53 ∝m) stock due to the functionality this property provides to the soil and its sensitivity to management practices. Aiming to assess soil quality no-till crop systems, this study was carried out through a long-term experiment (21 years) in a Latossolo Vermelho distrófico típico (typical Oxisol) in Ponta Grossa, PR, Brazil. Six crop systems were assessed. Wheat-TR (Triticum aestivum L.), soybean-SO […]

Quality of surface water related to land use: a case study in a catchment with small farms and intensive vegetable crop production in southern Brazil

Karina Hacke Ribeiro, Nerilde Favaretto, Jeferson Dieckow, Luiz Cláudio de Paula Souza, Jean Paolo Gomes Minella, Luciano de Almeida, [...]

01/Apr/2014

Water degradation is strongly related to agricultural activity. The aim of this study was to evaluate the influence of land use and some environmental components on surface water quality in the Campestre catchment, located in Colombo, state of Parana, Brazil.  Physical and chemical attributes were analyzed (total nitrogen, ammonium, nitrate, total phosphorus, electrical conductivity, pH, temperature, turbidity, total solids, biological oxygen demand, chemical oxygen demand and dissolved oxygen). Monthly samples of the river water were taken over one year at […]

Methane fluxes from waterlogged and drained Histosols of highland areas

Marcos Fernando Glück Rachwal, Josiléia Acordi Zanatta, Jeferson Dieckow, Genuir Luis Denega, Gustavo Ribas Curcio, Cimélio Bayer

01/Apr/2014

Soil can be either source or sink of methane (CH4), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). […]

Carbon and nitrogen losses with liquid catlle manure from a clayey oxissol under no-till and natural rainfall

Adriana Timofiecsyk, Nerilde Favaretto, Volnei Pauletti, Jeferson Dieckow

01/Dec/2012

The transport of pollutants via runoff in agricultural areas, mainly in soluble forms, is an environmental problem, even in conservation tillage systems. The objective of this study was to evaluate losses of nitrogen and organic carbon in runoff, after applications of 0, 60, 120, and 180 m3 ha-1 yr-1 of cattle slurry to a clayey Oxisol, with 10 % slope under no-tillage and natural rainfall, in the region of Castro – PR. The application of cattle slurry did not affect […]

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