252 results

Occurrence of arbuscular mycorrhizal fungi in leaf litter and roots of shaded coffee plantations under organic and conventional management

Lucía Ana Díaz-Ariza ORCID logo , Emma Lucía Rivera ORCID logo , Natalia Sánchez ORCID logo

15/fev/2021

ABSTRACT Evidence of arbuscular mycorrhizal fungal colonization of mat litter in various ecosystems plus previous reports of external mycelium of those fungi and mycorrhizal roots in litter from coffee plants and shade trees on coffee plantations suggest that they have a relationship with closed direct nutrient cycling between organic matter and living roots. This relationship was first proposed more than 50 years ago. Mycorrhizal symbiosis in tropical crops is affected by agricultural management practices. This study aimed to assess the […]

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Impacts of land-use changes on soil respiration in the semi-arid region of Brazil

José Romualdo de Sousa Lima ORCID logo , Rodolfo Marcondes Silva Souza ORCID logo , Eduardo Silva dos Santos ORCID logo , Eduardo Soares de Souza ORCID logo , Jéssica Emanuella da Silva Oliveira ORCID logo , Érika Valente de Medeiros ORCID logo , [...]

27/nov/2020

ABSTRACT Soil respiration represents the largest flux of CO2 emission from terrestrial ecosystems, being affected by land-use changes and soil properties. There are few studies investigating the response of soil respiration to land-use changes in the Caatinga biome. This study aimed to measure soil respiration from Caatinga vegetation and degraded pasture, to verify the effect of land-use changes on soil respiration. Measurements of soil respiration were performed using the infrared gas analyzer method over nine months (in rainy and dry […]

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Analysis of changes in volume and propagation of cracks in expansive soil due to changes in water content

Silvio Romero de Melo Ferreira ORCID logo , Arthur Gomes Dantas de Araújo ORCID logo , Felipe Araújo Silva Barbosa ORCID logo , Thalita Cristina Rodrigues Silva ORCID logo , Izabela Medeiros de Lima Bezerra ORCID logo

27/nov/2020

ABSTRACT Expansive clay soils are a problem for agriculture and engineering because they are susceptible to change in volume due to seasonal variation in water content and temperature. One of its morphological properties is slickensides, which result from the ability to contract and crack when dry and expand by wetting. The objective of this study was to evaluate the processes of expansion and formation and propagation of cracks due to the change in water content over time. The expansion process […]

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Winter cover crops effects on soil organic carbon and soil physical quality in a Typical Argiudoll under continuous soybean cropping

María Paz Salazar ORCID logo , Carlos Germán Soracco ORCID logo , Rafael Villarreal ORCID logo , Nicolás Guillermo Polich ORCID logo , Guido Lautaro Bellora ORCID logo , Matías Javier Turinetto ORCID logo , [...]

27/nov/2020

ABSTRACT The massive adoption of no-tillage (NT), along with the simplification of the cropping sequences has led to physical and chemical degradation of soils. To recover degraded soils, cover crops have been proposed as an alternative to increase soil organic carbon (SOC) and to improve soil physical quality (SPQ). This study aimed (i) to determine the content of SOC and its physical and chemical fractions at different layers and positions, in a soil with a soybean crop under NT with […]

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Total fungi and yeast distribution in soils over native and modified vegetation in central Brazil

Geisianny Augusta Monteiro Moreira ORCID logo , Elisa Catão Caldeira Pires ORCID logo , Cristine Chaves Barreto ORCID logo , Helson Mario Martins do Vale ORCID logo

25/nov/2020

ABSTRACT Fungi are ubiquitous components of soil microbial communities, generally comprise the largest proportion of soil biomass. They can occur as filamentous forms or unicellular yeasts, in both, as free-living or symbionts. Next generation sequencing has allowed greater depth of the access to soil fungal diversity complementing culture-dependent results. In Brazil, the state of Minas Gerais is recognized for its mining activity, which modifies the vegetation cover and consequently the soil microbial communities. To describe the fungal community (total fungi […]

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Comparison of water and osmotic potentials on Vigna unguiculata stress response

Hidelblandi Farias de Melo ORCID logo , Edivan Rodrigues de Souza ORCID logo , Pablo Rugero Magalhães Dourado ORCID logo , Cíntia Maria Teixeira Lins ORCID logo , Hugo Rafael Bentzen Santos ORCID logo , Danilo Rodrigues Monteiro ORCID logo , [...]

11/nov/2020

ABSTRACT Drought and soil salinity are the main abiotic stresses in semiarid regions of the world. This study aims to evaluate the effect of water tensions generated by the reduction of soil moisture and salt on the leaf water potential of cowpea (Vigna unguiculata L. Walp). The experiments were conducted in a randomized complete block design, with a 6 × 2 factorial arrangement consisted of six soil water tensions (0.025, 0.265, 0.485, 0.705, 0.925, and 1.145 MPa) and two tension […]

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Yeast species and strains differing along an altitudinal gradient in the Brazilian forest domain

Geisianny Augusta Monteiro Moreira ORCID logo , Érica Mangaravite ORCID logo , Nívea Moreira Vieira ORCID logo , Fernando Augusto da Silveira ORCID logo , Wendel Batista da Silveira ORCID logo , Helson Mario Martins do Vale ORCID logo

06/nov/2020

ABSTRACT Soil microbiota is an important component of the forest biomes, playing important roles in the soil aggregation and cycling of nutrients. Among the soil microorganisms stand out the yeasts, which are unicellular fungi involved in important soil ecological processes. The Brazilian Atlantic Forest is one of the main biodiversity hotspots in the world, and the effect of altitudinal gradient on the distribution patterns of yeast species across this ecosystem has not yet been addressed. Thus, this study aimed to […]

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Physical properties of a Brazilian sandy loam soil after the traffic of a military vehicle M113 BR

Beatriz Wardzinski Barbosa ORCID logo , Fabrício de Araújo Pedron ORCID logo , Cândida Regina Müller ORCID logo , Miriam Fernanda Rodrigues ORCID logo , Paulo Ivonir Gubiani ORCID logo , Ricardo Bergamo Schenato ORCID logo , [...]

06/nov/2020

ABSTRACT Soil physical properties can be changed after vehicle traffic, especially by heavy military tracked vehicles. The Santa Maria military Instruction Field, where the experiment was carried out, is currently the most used area for armored tracked vehicles training in Brazil, with the M113 BR being the main equipment. The aim of this study was to determine the effect of the straight line and pivoted traffic intensity of the M113 BR on the physical properties and advancement of the compaction […]

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How sulfate content and soil depth affect the adsorption/desorption of selenate and selenite in tropical soils?

Anderson Mendes Araujo ORCID logo , Josimar Henrique de Lima Lessa ORCID logo , Luiz Gustavo Chanavat ORCID logo , Nilton Curi ORCID logo , Luiz Roberto Guimarães Guilherme ORCID logo , Guilherme Lopes ORCID logo

06/nov/2020

ABSTRACT Sorption of selenate (SeO 4 2- ) and selenite (SeO 3 2- ) is poorly understood in Brazilian agroecosystems, especially in soils from agricultural areas containing different contents of competing anions, such as sulfate (SO 4 2- ). This study aimed to assess the sorption behavior of selenate and selenite at different soil layers of a tropical soil treated with different rates of agricultural gypsum (thus, containing different contents of sulfate), collected under a coffee plantation. Soil samples from […]

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Isolates of Bacillus sp. from garlic: effect on corn development and plant growth-promoting mechanisms

William Gilberto Balbinot ORCID logo , Sabrina Rodrigues ORCID logo , Glória ReginaBotelho ORCID logo

21/out/2020

ABSTRACT Corn and garlic are important crops to Curitibanos region (state of Santa Catarina – Brazil), often planted in alternate cropping seasons. Production costs are high, especially due to N fertilizer, since they are highly demanding in N. In addition to reducing economic costs, the search for environmentally sustainable technologies has stimulated the study of interactions between plants and growth-promoting microorganisms. Rhizobacteria, e.g., Bacillus sp., have been presenting as growth-promoting microorganisms. Five isolates of garlic rhizosphere from 27 individuals of […]

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