• en
  • pt-br

All publications of “Cimélio Bayer”

46 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 […]

Visual Abstract

Crop Yield Responses to Sulfur Fertilization in Brazilian No-Till Soils: a Systematic Review

Osmar Henrique de Castro Pias ORCID logo , Tales Tiecher, Maurício Roberto Cherubin, Michael Mazurana, Cimélio Bayer


ABSTRACT Sulfur (S) fertilization recommendations for grain crops in Brazil were formerly established from studies on crops with a low yield potential grown on soils under conventional tillage (CT). However, the subsequent adoption of no-tillage (NT) altered S dynamics in the soil, making it necessary to carefully evaluate the applicability of these S fertilizer recommendations. In addition, the emergence of modern high-yield-potential genotypes, the successive application of concentrated low-sulfur fertilizers, and reduction in S atmospheric deposition have raised the likelihood […]

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System

Douglas Adams Weiler, Carlos Gustavo Tornquist, Tiago Zschornack, Stephen Michael Ogle, Filipe Selau Carlos, Cimélio Bayer


ABSTRACT The DayCent ecosystem model, widely tested in upland agroecosystems, was recently updated to simulate waterlogged soils. We evaluated the new version in a paddy rice experiment in Southern Brazil. DayCent was used to simulate rice yield, soil organic carbon (SOC), and soil CH4 fluxes. Model calibration was conducted with a multiple-year dataset from the conventional tillage treatment, followed by a validation phase with data from the no-tillage treatment. Model performance was assessed with statistics commonly used in modeling studies: […]

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 […]

Crop Response to Gypsum Application to Subtropical Soils Under No-Till in Brazil: a Systematic Review

Tales Tiecher, Osmar Henrique de Castro Pias, Cimélio Bayer, Amanda Posselt Martins, Luiz Gustavo de Oliveira Denardin, Ibanor Anghinoni


ABSTRACT The use of gypsum to improve the root environment in tropical soils in the southeastern and central-western regions of Brazil is a widespread practice with well-established recommendation criteria. However, only recently gypsum began to be used on subtropical soils in South of Brazil, so available knowledge of its effect on crop yield is incipient and mainly for soils under no-till (NT) systems. Avaiable studies span a wide range of responses, from a substantial increase to a slight reduction in […]

Urease Inhibitor and Irrigation Management to Mitigate Ammonia Volatilization from Urea in No-Till Corn

Fernando Viero, Guilherme Batista Menegati, Eduardo Carniel, Paulo Regis Ferreira da Silva, Cimélio Bayer


ABSTRACT High nitrogen (N) losses by ammonia (NH3) volatilization from urea can compromise nitrogen fertilization efficiency and corn yield. The purpose of this study was to assess the effects of irrigation management and the addition of the urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) on NH3-N losses from urea and on corn yield. To this end, two experiments were carried out in the 2011/12 crop season on a sandy clay loam Acrisol in the Central Basin region of Rio Grande do Sul, […]

Nitrogen Fertilization of No-Tillage Winter Cereals in the South-Central Region of Paraná, Brazil

Sandra Mara Vieira Fontoura, Fernando Viero, Renato Paulo de Moraes, Cimélio Bayer


ABSTRACT High winter cereal yields depend on an adequate supply of nitrogen (N). We developed a system for indicating N rates for wheat and barley in the South-Central region of the state of Paraná, Brazil, using results of 72 field experiments conducted from 2007 to 2012. The N rates recommended for winter cereals were estimated to supply the amounts of N fertilizer needed to obtain increasing yields (5.5 Mg ha-1) of crops grown after soybean and corn on soils with […]

Sampling Layer for Soil Fertility Evaluation in Long-Term No-Tillage Systems

Renan Costa Beber Vieira, Sandra Mara Vieira Fontoura, Cimélio Bayer, Paulo Roberto Ernani, Ibanor Anghinoni, Renato Paulo de Moraes


ABSTRACT In no-tillage (NT) systems, there is no plowed layer since the soil is not tilled. Thus, the soil layer for fertility evaluation can be defined as the one in which the fertility indices are affected by the surface application of lime and fertilizers and soil properties have the closest relationship with crop yields. The objective of this study was to determine the most appropriate soil layer under long-term NT for sampling for fertility evaluation in the South-Central region of […]

Potassium Fertilization for Long Term No-Till Crop Rotation in the Central-Southern Region of Paraná, Brazil

Renan Costa Beber Vieira, Sandra Mara Vieira Fontoura, Cimélio Bayer, Renato Paulo de Moraes, Eduardo Carniel


ABSTRACT Fertilization programs for annual crops in the state of Paraná, southern Brazil, are based on studies that focused on conventional tillage and were established more than 30 years ago. The primary purpose of this study was to assess potassium (K) fertilization on long-term (>30 years) no-tillage soybean, corn, wheat, and barley crops grown in rotation on Oxisols in the central-southern region of Paraná. A total of 47 experiments were carried out from 2008 to 2013, three of which addressed […]

Physical Properties of a Hapludox after Three Decades under Different Soil Management Systems

Franciani Rodrigues da Silva, Jackson Adriano Albuquerque, André da Costa, Sandra Mara Vieira Fontoura, Cimélio Bayer and, Maria Izabel Warmling


ABSTRACT Changes in soil physical properties due to different management systems occur slowly, and long-term studies are needed to assess soil quality. The objectives of this study were to evaluate the effects of soil management systems and liming methods on the physical properties of a Latossolo Bruno Alumínico típico (Hapludox). A long-term experiment that began in 1978 with conventional and no-tillage systems was assessed. In addition, different liming methods (no lime, incorporated lime, and lime on the soil surface) have […]

1 2 3 5