Effect of cropping systems in no-till farming on the quality of a Brazilian Oxisol

Junior, Getulio de Freitas Seben; Corá, José Eduardo; Lal, Rattan

doi:10.1590/s0100-06832014000400023

Cited by 9 publications

(2 citation statements)

References 46 publications

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“…Nesse sentido, sistemas produtivos vêm sendo redesenhados de forma a privilegiar aportes de C e minimizar perdas, estas últimas caracterizadas principalmente pela emissão de CO 2 , em consequência da atividade microbiana edáfica. O plantio direto -com rotação de culturas, múltiplos ciclos produtivos no ano e mobilização do solo restrita à linha de plantio/semeadura -é exemplo e síntese de eficiência no sequestro de C pelo solo (Corazza et al, 1999;Lovato et al, 2004;Seben Júnior et al, 2014). Outras alternativas, também fundamentais no balanço entre aportes e saídas, passam pela aplicação de fonte externa de C no solo, como na reciclagem agrícola de resíduos orgânicos.…”

Section: Introductionunclassified

Mineralização e efeitos de biocarvão de cama de frangosobre a capacidade de troca catiônica do solo

Andrade

Bibar²,

Coscione

et al. 2015

Pesq. agropec. bras.

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O objetivo deste trabalho foi caracterizar o processo de mineralização do C em amostras de cama de frango e de seu respectivo biocarvão, além de determinar a capacidade de troca catiônica (CTC) e as taxas de mineralização do C nos solos tratados com cama de frango e biocarvão. A mineralização do C foi avaliada em experimento com quantificação do C-CO2 liberado a partir de incubação (64 dias) de misturas de solo com cama de frango e de solo com biocarvão, em doses equivalentes a 0, 1.000, 2.000, 4.000 e 8.000 mg kg-1 de C. Ao final da incubação, determinaram-se, nas amostras de solo, o teor de C, o pH e a CTC. A mineralização do C dos materiais obedeceu à cinética química de primeira ordem. Os fluxos de C-CO2 foram mais intensos dos 20 aos 40 dias de incubação, seguidos da redução desses fluxos até a estabilização no tempo. As taxas de mineralização do C da cama de frango e de seu biocarvão foram respectivamente de 49,7 e 5,1%. Incrementos da CTC foram observados nos tratamentos com biocarvão, em consequência da elevação do pH, e, em ambos os materiais, em consequência de alterações do teor de C no solo.

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Section: Introductionunclassified

Mineralização e efeitos de biocarvão de cama de frangosobre a capacidade de troca catiônica do solo

Andrade

Bibar²,

Coscione

et al. 2015

Pesq. agropec. bras.

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“…Very common in publications addressing the least limiting water range is its estimation for several soil densities or degrees of compaction, aiming to predict the effects of a possible compaction on the soil physical quality and crop yields (Imhoff et al, 2001;Leão et al, 2004;Beutler et al, 2008;Blainski et al, 2009;Kaiser et al, 2009;Petean et al, 2010;De Lima et al, 2012;Farias et al, 2013;Guimarães et al, 2013;Moreira et al, 2014a;Seben Junior et al, 2014). In this case, θ fc and θ pwp are usually estimated as a function of an empirical relationship between the water content, bulk density and matric potential proposed by Silva et al (1994) or other also empirical equations (Guimarães et al, 2013), using fixed values for the matric potential; θ pr is calculated as a function of soil bulk density using the empirical model proposed by Busscher (1990), assessing it for a fixed impedance value, commonly 2 MPa; and θ air is calculated by subtracting 0.1 m 3 m -3 from total porosity, which is a function of the bulk and particle density.…”

Section: Critical Densitymentioning

confidence: 99%

Beyond the “Least Limiting Water Range”: Rethinking Soil Physics Research in Brazil

Lier

Gubiani

2015

Rev. Bras. Ciênc. Solo

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As opposed to objective definitions in soil physics, the subjective term "soil physical quality" is increasingly found in publications in the soil physics area. A supposed indicator of soil physical quality that has been the focus of attention, especially in the Brazilian literature, is the Least Limiting Water Range (R LL ), translated in Portuguese as "Intervalo Hídrico Ótimo" or IHO. In this paper the four limiting water contents that define R LL are discussed in the light of objectively determinable soil physical properties, pointing to inconsistencies in the R LL definition and calculation. It also discusses the interpretation of R LL as an indicator of crop productivity or soil physical quality, showing its inability to consider common phenological and pedological boundary conditions. It is shown that so-called "critical densities" found by the R LL through a commonly applied calculation method are questionable. Considering the availability of robust models for agronomy, ecology, hydrology, meteorology and other related areas, the attractiveness of R LL as an indicator to Brazilian soil physicists is not related to its (never proven) effectiveness, but rather to the simplicity with which it is dealt. Determining the respective limiting contents in a simplified manner, relegating the study or concern on the actual functioning of the system to a lower priority, goes against scientific construction and systemic understanding. This study suggests a realignment of the research in soil physics in Brazil with scientific precepts, towards mechanistic soil physics, to replace the currently predominant search for empirical correlations below the state of the art of soil physics.

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Cover crop impacts on soil physical properties: A review

Blanco‐Canqui

Ruis

2020

Soil Science Soc of Amer J

149

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Cover crop (CC) impacts on soil ecosystem services including erosion control, C sequestration, soil productivity, and others have been reviewed. However, CC impacts on soil physical properties, which affect the soil's ability to perform a variety of soil ecosystem services, have not been synthesized. We reviewed 98 peer-reviewed publications up to 10 June 2020 on CCs and soil physical properties. Our review indicates that, in most studies, CCs reduce soil penetration resistance or compaction by 0-29% (average, 5%). They improve wet aggregate stability by 0-95% (average, 16%) and cumulative infiltration by 0-190% (average, 43%) but have negligible impacts on bulk density, dry aggregate stability, saturated hydraulic conductivity (K sat), unsaturated hydraulic conductivity (K unsat), volumetric water content at −10 to −33 kPa matric potential (field capacity), and plant available water. Soils under CCs can be cooler in daytime and warmer at nighttime, and warmer in winter and cooler in the rest of year. Volumetric heat capacity increases and thermal diffusivity decreases, indicating that CCs could moderate heat transport rate. Soil texture, tillage system, CC-derived soil C concentration, and CC duration affect CC impacts on physical properties. For example, the positive impacts from CCs can increase as CC management duration increases and combining CCs with no-till can improve water infiltration more than with tilled soils. Long-term data on hydraulic properties, thermal properties, dry aggregate stability, and pore-size distribution are scant. In general, CCs improve most soil physical properties, but the magnitude of improvement is highly site-and management specific.

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Effect of cropping systems in no-till farming on the quality of a Brazilian Oxisol

Cited by 9 publications

References 46 publications

Mineralização e efeitos de biocarvão de cama de frangosobre a capacidade de troca catiônica do solo

Mineralização e efeitos de biocarvão de cama de frangosobre a capacidade de troca catiônica do solo

Beyond the “Least Limiting Water Range”: Rethinking Soil Physics Research in Brazil

Cover crop impacts on soil physical properties: A review

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