252 results

N2O emissions from soils under different uses in the Brazilian Cerrado – A review

Thais Rodrigues de Sousa ORCID logo , Maria Lucrecia Gerosa Ramos ORCID logo , Cícero Célio de Figueiredo ORCID logo , and Arminda Moreira de Carvalho ORCID logo

24/nov/2021

ABSTRACT: The Cerrado (Brazilian savannah) is a biome of great socio-economic and environmental importance to Brazil. The rapid agricultural expansion in the Cerrado biome areas promoted biogeochemical cycles that affect nitrogen and carbon dynamics, leading to increased greenhouse gas (GHG) emissions. In Brazil, nitrous oxide (N2O) is the main gas in agriculture, and agricultural practices increase emissions into the atmosphere. This review aimed to assess the influence of agriculture on N2O emissions in the Cerrado region, based on existing data […]

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Shaking settings to reduce the breakdown of Entisol fragile particles in texture analysis

Paulo Ivonir Gubiani ORCID logo , Thiago Assunsão de Almeida ORCID logo , Rodrigo Pivoto Mulazzani ORCID logo , Fabrício de Araújo Pedron ORCID logo , Luis Eduardo Akiyoshi Sanches Suzuki ORCID logo , Caroline Andrade Pereira ORCID logo

05/nov/2021

ABSTRACT Finding the proper shaking setting to ensure total particle dispersion without altering the content of sand, silt and clay in soils composed of fragile particles such as saprolite fragments is still a research gap. This study aimed to identify the best shaking setting to optimize particle dispersion and minimize particle change in samples of Entisol (Neossolos). Samples were dispersed using an electric mixer at 12,000 rpm for 5, 15, 30 and 60 min, a horizontal shaker at 150 cycles […]

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Terracing increases soil available water to plants in no-tillage

Letiéri da Rosa Freitas ORCID logo , Paulo Ivonir Gubiani ORCID logo , Rodrigo Pivoto Mulazzani ORCID logo , Jean Paolo Gomes Minella ORCID logo , Ana Lúcia Londero ORCID logo

15/out/2021

ABSTRACT Several management practices can increase soil water storage capacity, but their effectiveness to minimize the adverse effects of drought depends on their potential to increase the soil available water to plants. Terracing is an effective option to increase soil water storage, but its effect on available water to plants in no-tillage system is still a knowledge gap. In this study, we monitored soil water content at eight layers down to 1.6 m in two zero-order paired catchments for 16 […]

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Mycorrhizal inoculation and phosphorus fertilization show contrasts on native species of the Brazilian Atlantic Forest and Cerrado

Paulo Prates Júnior ORCID logo , Bruno Coutinho Moreira ORCID logo , Marliane de Cássia Soares da Silva ORCID logo , Nayron Vilela Diogo ORCID logo , José Maria Rodrigues da Luz ORCID logo , Thuany Cerqueira Jordão ORCID logo , [...]

09/set/2021

ABSTRACT Restoration of degraded sites by using native plants like Plathymenia reticulata Benth. and Melanoxylon brauna Schot. is advisable. However, seedlings of both species, when raised on commercial substrates, may present low survival. This study aimed to evaluate the growth of seedlings under inoculation with arbuscular mycorrhizal fungi (AMF). The seedlings were raised on soil sampled from near an adult plant of the same species. The P. reticulata and M. brauna seedlings were grown with or without the inoculation of […]

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Edaphic fauna and soil properties under different managements in areas impacted by natural disaster in a mountainous region

Sandra Santana de Lima ORCID logo , Adriana Maria de Aquino ORCID logo , Rafaela Martins da Silva ORCID logo , Priscila Silva Matos ORCID logo , Marcos Gervasio Pereira ORCID logo

24/ago/2021

ABSTRACT Soil invertebrate fauna plays a major role in several environmental processes, and its absence can negatively impact ecosystem health. This study aimed to assess the recovery of epigeal and edaphic invertebrate faunal communities following an environmental disaster, with landslides, mudflow, and river floods, in sites under different management systems, the effects of cover crops on invertebrate fauna, and their relationship with soil physical and chemical properties in the mountainous region of Rio de Janeiro State, Brazil. The following sites […]

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Mulching films affecting soil bacterial and fungal communities in a drip-irrigated potato soil

Wen Wang ORCID logo , Lu Han ORCID logo , Xiong Zhang ORCID logo

06/ago/2021

ABSTRACT Film mulching is an effective water-saving and yield-increasing measure for potato production in Northwest China. However, the response mechanism of microbial communities to mulching films in the soil is still unclear. In this study, polyethylene film mulching (PM), biodegradable film mulching (BM), liquid film mulching (LM), and non-mulching (NM) were applied on the drip-irrigated soil to investigate the effects of mulching films on soil bacterial and fungal communities through DNA sequencing, Pearson correlation analysis, and redundancy analysis. The results […]

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Characterization and manipulation of montmorillonite properties towards technological and environmental applications

Vander Freitas Melo ORCID logo , Regiane Salata ORCID logo , Gilberto Abate ORCID logo , Antonio Carlos Azevedo ORCID logo , Larissa Kummer ORCID logo

29/jul/2021

ABSTRACT The combination of pillarization and charge neutralization with Li+ can make montmorillonite an important support material for industry and decontamination of pollutants in soil and water. Montmorillonite characterization techniques were described in detail, and pillarization procedures were used, after Li+ saturation, to modify and manipulate the chemical and mineralogical surface properties of this montmorillonite. Eight samples were produced: 1) natural montmorillonite (Chisholm Mine – MMT); 2) Li+ saturated montmorillonite (MMTLi); 3) polyethylene glycol (PEG) Al-pillared montmorillonite (AlPEG); 4) PEG […]

Estimating lateral flow in double ring infiltrometer measurements

Daniel Boeno ORCID logo , Paulo Ivonir Gubiani ORCID logo , Quirijn de Jong Van Lier ORCID logo , Rodrigo Pivoto Mulazzani ORCID logo

29/jul/2021

ABSTRACT The steady infiltration rate of soil profiles is commonly determined for irrigation and soil conservation planning, but the divergence of methods reduces the reliability of measurements. In this study, the steady infiltration rate measured with a double ring infiltrometer (isr-dri) in different layers of a soil profile was compared between layers and with the steady vertical saturated flow rate estimated by the Richards equation (isr-hy). The measurements of isr-dri at the top of the A, E, and Bt horizons […]

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Rock size fragments reduction allow including their effect on water retention properties determined with a dew point potentiometer

Paulo Ivonir Gubiani ORCID logo , Caroline Andrade Pereira ORCID logo , Jussara Santoli Cauduro ORCID logo , Colin Campbell ORCID logo , Leonardo Rivera ORCID logo , Cassiano Salin Pigatto ORCID logo , [...]

24/jun/2021

ABSTRACT The relation between water content and water potential is a key soil hydraulic property. The presence of rock fragments in soils can affect this property in bulk soil. In this study, we focused on the relation property determined with a WP4 dew point potentiometer. The objective was to evaluate the hypothesis that breaking large gravel-size particles into smaller fragments is a suitable strategy for accurate WP4 measurements in coarse materials without affecting the retention properties. Ten initial samples of […]

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Outstanding impact of Azospirillum brasilense strains Ab-V5 and Ab-V6 on the Brazilian agriculture: Lessons that farmers are receptive to adopt new microbial inoculants

Mariana Sanches Santos ORCID logo , Marco Antonio Nogueira ORCID logo , Mariangela Hungria ORCID logo

24/fev/2021

ABSTRACT For decades, researchers around the world search for strategies aiming at higher sustainability in agriculture. The microbial inoculants or biofertilizers are biotechnological products used for different purposes, the main one being to totally or partially replace chemical fertilizers, with an emphasis on N-fertilizers, reducing costs of production and decreasing the contamination of the soil, water, and atmosphere. Depending on the microorganism and the inoculated crop, inoculants can also induce plant protection to abiotic and biotic stresses and positively modify […]

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