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Eduardo Fávero Caires

Bio: Eduardo Fávero Caires is an academic researcher from Ponta Grossa State University. The author has contributed to research in topics: Lime & Soil pH. The author has an hindex of 33, co-authored 90 publications receiving 2965 citations. Previous affiliations of Eduardo Fávero Caires include National Council for Scientific and Technological Development.
Topics: Lime, Soil pH, No-till farming, Oxisol, Soil horizon


Papers
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Journal ArticleDOI
TL;DR: The results suggest that aluminum toxicity is low in no-till systems during cropping seasons that have adequate and well-distributed rainfall, but in unfavorable rainfall conditions, the toxicity of aluminum severely compromises root growth and yield.

181 citations

Journal ArticleDOI
TL;DR: The effectiveness of surface application of lime to soils under a no-till (NT) system, particularly with regard to subsoil acidity, is uncertain, and long-term data is needed to determine optimum surface liming rates in this cropping system as discussed by the authors.
Abstract: The effectiveness of surface application of lime to soils under a no-till (NT) system, particularly with regard to subsoil acidity, is uncertain, and long-term data is needed to determine optimum surface liming rates in this cropping system A field experiment was performed in the period from 1993 through 2003 in Parana State, Brazil, on a loamy, kaolinitic, thermic Typic Hapludox to evaluate the extent of the downward movement of surface-applied lime in a NT system, and the effect on grain yields under crop rotation The treatments consisted of dolomitic limestone at the rates of 0,2,4, and 6 t ha -1 , calculated to raise the base saturation in the topsoil (0-20 cm) to 50, 70, and 90% Surface-applied lime under NT was effective in alleviating soil acidity below the point of placement, and increased the cumulative grain yield of the crops The effects of surface liming on all three acidity-related variables (pH, Al, and basic cations) were significant at 0- to 5- and 5- to 10-cm depths from 1 yr onward, and also at the 10- to 20-cm depth from 25 yr onward, remaining consistent for a period of up to 10 yr after liming The maximum economic yield was obtained at 4 t ha -1 of limestone, showing that the lime rate estimated by the soil base saturation method at 70% in the 0- to 20-cm depth was appropriate for surface liming recommendation in a NT system

161 citations

Journal ArticleDOI
TL;DR: In this article, an experiment on calcario dolomitico, gesso, and soja was conducted on the Latossolo Vermelho-Escuro distrofico, em Ponta Grossa (PR).
Abstract: O experimento foi desenvolvido em um Latossolo Vermelho-Escuro distrofico, em Ponta Grossa (PR), com o objetivo de avaliar os efeitos da aplicacao de calcario e gesso na superficie sobre as caracteristicas quimicas do solo e resposta da soja cultivada em sistema de cultivo sem preparo do solo. O delineamento experimental empregado foi o de blocos ao acaso em parcela subdividida, com tres repeticoes. Foram utilizadas quatro doses de calcario dolomitico, com 84% de PRNT: 0, 2, 4 e 6 t ha-1, e quatro doses de gesso agricola: 0, 4, 8 e 12 t ha-1. A calagem foi realizada em julho, e a aplicacao de gesso em novembro de 1993. A cultura da soja foi avaliada nos anos agricolas de 1993/94 e 1995/96. A soja nao respondeu a aplicacao de calcario e gesso na superficie, em solo com pH (CaCl2 0,01 mol L-1) 4,5 e 32% de saturacao por bases na camada de 0-20 cm. A calagem proporcionou correcao da acidez do solo, revelada pela elevacao do pH e reducao do aluminio trocavel, ate a profundidade de 10 cm e em camadas subsuperficiais, mostrando que a acao do calcario aplicado na superficie, em areas com cultivos ja estabelecidos, nao preparadas convencionalmente, pode atingir camadas mais profundas de solo. Esse efeito foi observado doze meses apos a aplicacao do corretivo, tendo sido mais pronunciado apos vinte e oito meses. A aplicacao de gesso causou reducao do aluminio trocavel, elevou os teores de calcio em todo o perfil do solo e provocou lixiviacao de bases, principalmente de magnesio, tendo sido esta mais acentuada na presenca de maiores teores de magnesio trocavel no solo. Apos vinte e quatro meses, foram recuperados cerca de 40% do S-SO4 e 60% do calcio aplicados pelo gesso na dose de 12 t ha-1, ate a profundidade de 80 cm. Desse total recuperado, apenas 10% do S-SO4 e 25% do calcio foram encontrados na camada de 0-20 cm de solo.

148 citations

Journal ArticleDOI
TL;DR: Aplicacao de calcario na superficie aumentou significativamente o pH, os teores de Ca + Mg trocaveis and a saturacao por bases and reduziu significativoamente os teors de H + Al do solo, ate a profundidade de 60 cm.
Abstract: Existem informacoes conflitantes a respeito da eficiencia da aplicacao superficial de calcario em sistema plantio direto, particularmente na correcao da acidez do subsolo, e de criterios de recomendacao de calagem para tal sistema de cultivo. Com o objetivo de avaliar a correcao da acidez do solo e a producao de graos de culturas em rotacao no sistema plantio direto, considerando a aplicacao de calcario na superficie, foi realizado um experimento em um Latossolo Vermelho-Escuro distrofico textura media, em Ponta Grossa (PR), no periodo de 1993 a 1998. Os tratamentos, dispostos em blocos completos ao acaso com tres repeticoes, constaram de quatro doses de calcario dolomitico: 0, 2, 4 e 6 t ha-1, calculadas para elevar a saturacao por bases do solo a 50, 70 e 90%. O calcario foi aplicado em julho de 1993, a lanco, na superficie do solo. Foram cultivados, na sequencia, soja (1993/94), milho (1994/95), soja (1995/96), trigo (1996), soja (1996/97), triticale (1997) e soja (1997/98). A aplicacao de calcario na superficie aumentou significativamente o pH, os teores de Ca + Mg trocaveis e a saturacao por bases e reduziu significativamente os teores de H + Al do solo, ate a profundidade de 60 cm. Estimou-se que a maxima eficiencia tecnica (MET) e a economica (MEE) ocorreriam, respectivamente, com as doses de 3,8 e 3,3 t ha-1 de calcario. A dose de calcario para MEE foi a indicada pelo metodo da elevacao da saturacao por bases do solo a 65%, para amostra coletada na profundidade de 0-20 cm, mostrando ser este criterio adequado para recomendacao de calagem na superficie em sistema plantio direto. Todavia, a calagem na superficie deve ser recomendada somente para solo com pH (CaCl2) inferior a 5,6 ou saturacao por bases inferior a 65%, na camada de 0-5 cm.

148 citations

Journal ArticleDOI
15 Jan 2012-Geoderma
TL;DR: In this paper, the authors evaluate carbon protection mechanisms in different SOM pools in soil aggregates and identify the association of Ca2+ with total organic carbon (TOC) under the influence of surface liming in a medium-textured Oxisol in a long-term experiment under no-till system (NTS) in southern Brazil.

140 citations


Cited by
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01 Jan 2011
TL;DR: In this paper, the authors present a survey of the estimated costs of soil erosion, an issue of fundamental importance in view of the current worldwide discussion on soil erosion. But the authors focus on the cost of soil degradation.
Abstract: Resumen en: The aim of this study was a survey of the estimated costs of soil erosion, an issue of fundamental importance in view of the current worldwide discussion...

983 citations

Journal ArticleDOI
TL;DR: Biological nitrogen (N 2 ) fixation is key to sustainable agricultural systems in tropical soils, which are frequently deficient in N, but high temperature, drought and soil acidity constrain legume root-nodule formation and function in the tropics.

610 citations

Book ChapterDOI
TL;DR: In this paper, the authors provide a balanced perspective on the agronomic and environmental impacts of biochar amendment to soil, highlighting the physical and chemical characteristics of Biochar which can impact on the sorption, hence efficacy and biodegradation, of pesticides.
Abstract: Biochar is increasingly being recognized by scientists and policy makers for its potential role in carbon sequestration, reducing greenhouse gas emissions, renewable energy, waste mitigation, and as a soil amendment. The published reviews on biochar application to soil have so far focused mainly on the agronomic benefits, and have paid little attention to the potential unintended effects. The purpose of this chapter is to provide a balanced perspective on the agronomic and environmental impacts of biochar amendment to soil. The chapter highlights the physical and chemical characteristics of biochar, which can impact on the sorption, hence efficacy and biodegradation, of pesticides. As a consequence, weed control in biochar-amended soils may prove more difficult as preemergent herbicides may be less effective. Since biochars are often prepared from a variety of feedstocks (including waste materials), the potential introduction of contaminants needs to be considered before land application. Metal contaminants, in particular, have been shown to impact on plant growth, and soil microbial and faunal communities. Biochar has also been shown to influence a range of soil chemical properties, and rapid changes to nutrient availability, pH, and electrical conductivity need to be carefully considered to avoid unintended consequences for productivity. This chapter highlights some key areas of research which need to be completed to ensure a safe and sustainable use of biochar. In particular, understanding characteristics of biochars to avoid ecotoxicological impacts, understanding the effects of biochar on nutrient and contaminant behavior and transport, the effects of aging and the influence of feedstock and pyrolysis conditions on key properties are some of the areas that require attention.

546 citations

Book ChapterDOI
TL;DR: In this paper, a review brings together fundamental aspects of soil acidification and recent developments on the implications of liming in relation to soil processes, particularly nutrient and heavy metal transformation and bioavailability in soils.
Abstract: “ No other single chemical soil characteristic is more important in determining the chemical environment of higher plants and soil microbes than the pH There are few reactions involving any component of the soil or of its biological inhabitants that are not sensitive to soil pH This sensitivity must be recognized in any soil-management system” “ Lime is truly a foundation for much of modern humid-region agriculture Knowing how pH is controlled, how it influences the supply and availability of essential plant nutrients as well as toxic elements, how it affects higher plants and human beings, and how it can be ameliorated is essential for the conservation and sustainable management of soils throughout the world” (Brady and Weil, 1999) Under areas where rainfall exceeds evapotranspiration, soil acidification is an ongoing natural process, which can either be accelerated by the activity of plants, animals and humans or can be impeded by careful management practices In areas affected by industrial activities, soil acidification is caused by acid drainage from pyrite oxidation and also from acid precipitation In areas that remain unaffected by industrial pollution, soil acidification in managed ecosystems is mainly caused by the release of protons (H + ) during the transformation and cycling of carbon (C), nitrogen (N) and sulfur (S) Just like in managed ecosystems, soil acidification in natural ecosystems caused by acid drainage and acid precipitation can have adverse impacts where soils have low pH buffering capacity Liming is the most common management practice aimed at neutralizing the acid produced, thereby overcoming the adverse impacts of soil acidification This review brings together fundamental aspects of soil acidification and recent developments on the implications of liming in relation to soil processes, particularly nutrient and heavy metal transformation and bioavailability in soils The article first outlines the various soil, plant and microbial processes that generate acid (protons; H + ions) both under natural and managed ecosystems It then discusses the effects of soil acidity on soil chemical and biological properties The effect of liming to overcome the problems associated with soil acidity is examined in relation to the transformation of nutrient ions and heavy metals The practical implications of liming to overcome heavy metal toxicity have been discussed in relation to the adsorption, leaching and phytoavailability of these metal ions Future research should aim to focus on the development of methods to quantify lime-enhanced (im)mobilization of nutrient ions and heavy metals in soils and to explore further the role of liming in remediating contaminated soils

433 citations