Soil compressibility and penetrability of an Oxisol from southern Brazil, as affected by long-term tillage systems☆

2007 ◽  
Vol 92 (1-2) ◽  
pp. 104-113 ◽  
Author(s):  
M DAVEIGA ◽  
R HORN ◽  
D REINERT ◽  
J REICHERT
Keyword(s):  
Southern Brazil ◽  
Tillage Systems ◽  
Soil Compressibility

Long-term effects of tillage systems on liming efficiency, soil chemical properties and wheat yield in Southern Brazil

Soil Research ◽  
2021 ◽  
Author(s):  
Sérgio Ricardo Silva ◽  
Henrique Pereira dos Santos ◽  
Rômulo Pisa Lollato ◽  
Anderson Santi ◽  
Renato Serena Fontaneli
Keyword(s):  
Wheat Yield ◽  
Chemical Properties ◽  
Soil Chemical Properties ◽  
Southern Brazil ◽  
Long Term Effects ◽  
Tillage Systems

scholarly journals Indoor radon concentration and a diffusion model in dwellings situated in a subalkaline granitoid area, Southern Brazil

2021 ◽  
Vol 80 (17) ◽  
Author(s):  
G. Romero-Mujalli ◽  
A. Roisenberg ◽  
A. Cordova-Gonzalez ◽  
P. H. P. Stefano
Keyword(s):  
Diffusion Model ◽  
Indoor Radon ◽  
Southern Brazil ◽  
High Concentration ◽  
Indoor Radon Concentration ◽  
One Dimensional ◽  
Environmental Limits ◽  
Radon Measurements ◽  
Cr 39 Detectors

AbstractRadon (Rn), a radioactive element, has especial interest in medical geology because long-term exposure to high concentration is related to lung cancer. In this study, outdoor and indoor radon measurements were conducted in dwellings of the Piquiri Syenite Massif, located in southern Brazil, given the relative high Rn content in soils of this region. Measurements were done using CR-39 detectors and placing them inside and outside dwellings. Moreover, a one-dimensional diffusion model was performed in order to quantify the natural transport of Rn to the air in confined and aerated environments. Results indicate that the region presents relatively low air Rn concentrations, within the environmental limits; however, the health risk might increase in confined and ill-ventilated environments because of transfer from soil and exhalation from ornamental rock-material often found inside dwellings. The main north facies of the syenite, where most of the rock extractions are located, was found to have the highest air Rn concentration because of the higher soil Rn concentration, compared to other facies of the syenite.

scholarly journals Trends in the Frequency of Intense Precipitation Events in Southern and Southeastern Brazil during 1960–2004

2011 ◽  
Vol 24 (7) ◽  
pp. 1913-1921 ◽  
Author(s):  
Mateus da Silva Teixeira ◽  
Prakki Satyamurty
Keyword(s):  
Extreme Rainfall ◽  
Southeastern Brazil ◽  
Extreme Rainfall Event ◽  
Southern Brazil ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
Annual Frequency ◽  
Long Term Trends ◽  
Increasing Trends

Abstract A new approach to define heavy and extreme rainfall events based on cluster analysis and area-average rainfall series is presented. The annual frequency of the heavy and extreme rainfall events is obtained for the southeastern and southern Brazil regions. In the 1960–2004 period, 510 (98) and 466 (77) heavy (extreme) rainfall events are identified in the two regions. Monthly distributions of the events closely follow the monthly climatological rainfall in the two regions. In both regions, annual heavy and extreme rainfall event frequencies present increasing trends in the 45-yr period. However, only in southern Brazil is the trend statistically significant. Although longer time series are necessary to ensure the existence of long-term trends, the positive trends are somewhat alarming since they indicate that climate changes, in terms of rainfall regimes, are possibly under way in Brazil.

Soil nitrous oxide emissions as affected by long-term tillage, cropping systems and nitrogen fertilization in Southern Brazil

2015 ◽  
Vol 146 ◽  
pp. 213-222 ◽  
Author(s):  
Cimélio Bayer ◽  
Juliana Gomes ◽  
Josiléia Accordi Zanatta ◽  
Frederico Costa Beber Vieira ◽  
Marisa de Cássia Piccolo ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Fertilization ◽  
Cropping Systems ◽  
Nitrous Oxide Emissions ◽  
Southern Brazil

scholarly journals Carbon dioxide efflux in a rhodic hapludox as affected by tillage systems in southern Brazil

2009 ◽  
Vol 33 (2) ◽  
pp. 325-334 ◽  
Author(s):  
Luis Fernando Chavez ◽  
Telmo Jorge Carneiro Amado ◽  
Cimélio Bayer ◽  
Newton Junior La Scala ◽  
Luisa Fernanda Escobar ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Crop Residues ◽  
Pore Space ◽  
Abiotic Factors ◽  
Soil Tillage ◽  
Static System ◽  
Southern Brazil ◽  
Soil Co2 ◽  
Tillage Systems ◽  
Dynamic Chamber

Agricultural soils can act as a source or sink of atmospheric C, according to the soil management. This long-term experiment (22 years) was evaluated during 30 days in autumn, to quantify the effect of tillage systems (conventional tillage-CT and no-till-NT) on the soil CO2-C flux in a Rhodic Hapludox in Rio Grande do Sul State, Southern Brazil. A closed-dynamic system (Flux Chamber 6400-09, Licor) and a static system (alkali absorption) were used to measure soil CO2-C flux immediately after soybean harvest. Soil temperature and soil moisture were measured simultaneously with CO2-C flux, by Licor-6400 soil temperature probe and manual TDR, respectively. During the entire month, a CO2-C emission of less than 30 % of the C input through soybean crop residues was estimated. In the mean of a 30 day period, the CO2-C flux in NT soil was similar to CT, independent of the chamber type used for measurements. Differences in tillage systems with dynamic chamber were verified only in short term (daily evaluation), where NT had higher CO2-C flux than CT at the beginning of the evaluation period and lower flux at the end. The dynamic chamber was more efficient than the static chamber in capturing variations in CO2-C flux as a function of abiotic factors. In this chamber, the soil temperature and the water-filled pore space (WFPS), in the NT soil, explained 83 and 62 % of CO2-C flux, respectively. The Q10 factor, which evaluates CO2-C flux dependence on soil temperature, was estimated as 3.93, suggesting a high sensitivity of the biological activity to changes in soil temperature during fall season. The CO2-C flux measured in a closed dynamic chamber was correlated with the static alkali adsorption chamber only in the NT system, although the values were underestimated in comparison to the other, particularly in the case of high flux values. At low soil temperature and WFPS conditions, soil tillage caused a limited increase in soil CO2-C flux.

Soil carbon and nitrogen stocks and fractions in a long-term integrated crop–livestock system under no-tillage in southern Brazil

2014 ◽  
Vol 190 ◽  
pp. 52-59 ◽  
Author(s):  
Joice Mari Assmann ◽  
Ibanor Anghinoni ◽  
Amanda Posselt Martins ◽  
Sérgio Ely Valadão Gigante de Andra Costa ◽  
Diego Cecagno ◽  
...  
Keyword(s):  
Soil Carbon ◽  
No Tillage ◽  
Southern Brazil ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen ◽  
Carbon And Nitrogen Stocks ◽  
Livestock System

scholarly journals Soil moisture under no-tillage and tillage systems in maize long-term experiment

2018 ◽  
Vol 51 (1) ◽  
pp. 103
Author(s):  
Aleksandra Król ◽  
Tomasz Żyłowski ◽  
Jerzy Kozyra ◽  
Jerzy Księżak
Keyword(s):  
Soil Moisture ◽  
No Tillage ◽  
Tillage Systems ◽  
Term Experiment ◽  
Long Term Experiment

How diversity of crop residues in long-term no-tillage systems affect chemical and microbiological soil properties

2019 ◽  
Vol 194 ◽  
pp. 104316 ◽  
Author(s):  
Daiane dos Santos Soares ◽  
Maria Lucrecia Gerosa Ramos ◽  
Robélio Leandro Marchão ◽  
Giovana Alcântara Maciel ◽  
Alexsandra Duarte de Oliveira ◽  
...  
Keyword(s):  
Soil Properties ◽  
Crop Residues ◽  
No Tillage ◽  
Tillage Systems
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