3296 results

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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Effect of 26-years of soil tillage systems and winter cover crops on C and N stocks in a Southern Brazilian Oxisol

Tales Tiecher ORCID logo , Elci Gubiani ORCID logo , Maria Alice Santanna ORCID logo , Murilo Gomes Veloso ORCID logo , Ademir Calegari ORCID logo , Lutécia Beatriz dos Santos Canalli ORCID logo , [...]

27/Nov/2020

ABSTRACT Soil management and crop rotation are key factors in controlling the accumulation of C and N in the soil profile, but their long-term effect remains poorly understood for deep soil layers, especially in subtropical conditions. Using a long-term experiment (26-years), this study aimed to evaluate the effect of different soil management systems associated with different winter cover crops on C and N accumulation in a very clayey (72 % clay) soil up to 1 m deep. Two tillage systems […]

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Soil fertility and nutritional status of elephant grass fertilized with organic compost from small ruminant production and slaughter systems

Graziella de Andrade Carvalho Pereira ORCID logo , Anacláudia Alves Primo ORCID logo , Abner José Girão Meneses ORCID logo , Maria Diana Melo de Araújo ORCID logo , Roberto Cláudio Fernandes Franco Pompeu ORCID logo , Fernando Lisboa Guedes ORCID logo , [...]

27/Nov/2020

ABSTRACT The application of organic composts derived from animal husbandry or agro-industry is a promising option to improve nutrient cycling and supply of soils and, consequently, forage production. The objective of this study was to evaluate the soil chemical properties and the nutritional state of elephant grass in response to rates of organic fertilizer composted from the waste of small ruminant production and slaughter systems. The experiment was conducted on a Fluvisol of a forage field with elephant grass var. […]

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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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Clonal teak litter in tropical soil: decomposition, nutrient cycling, and biochemical composition

Valéria Santos Cavalcante ORCID logo , Márcio Luiz dos Santos ORCID logo , Luisa Carla Cotta ORCID logo , Júlio César Lima Neves ORCID logo , Emanuelle Mercês Barros Soares ORCID logo

26/Nov/2020

ABSTRACT: Litter decomposition dynamics and nutrient release are also dependent on their biochemical composition, and such information is important for adequate nutritional management but is still incipient for plants like teak. This study aimed to evaluate the decomposition dynamics, nutrient release, and biochemical composition of clonal teak litter. The study was conducted in areas of clonal teak stands, in São José do Rio Claro, Mato Grosso, Brazil. Litter collectors were arranged in the area to collect material along the entire […]

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Different N-fertilization sources affecting the native soil organic matter mineralization on Technosols under iron ore tailing

Paula Afonso de Oliveira ORCID logo , Igor Rodrigues de Assis ORCID logo , Luiz Eduardo Dias ORCID logo , Ivo Ribeiro da Silva ORCID logo , Gustavo Magalhães Nunes Barbosa ORCID logo , Rafael da Silva Teixeira ORCID logo , [...]

26/Nov/2020

ABSTRACT: Accidents related to the rupture of iron ore tailings dams have dramatically impacted on the Brazilian natural ecosystem. So, the development of strategies to recover soil organic matter levels and build-up Technosols are required. This study aimed to evaluate the effect of N-mineral and -organic fertilization and the rhizospheric effect on soil organic matter mineralization from Technosols built under iron ore tailings. The experiment was carried out in a greenhouse; we used a factorial scheme 2 × 2 × […]

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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Sediment source and volume of soil erosion in a gully system using UAV photogrammetry

Bernardo Moreira Cândido ORCID logo , Mike James ORCID logo , John Quinton ORCID logo , Wellington de Lima ORCID logo , Marx Leandro Naves Silva ORCID logo

11/Nov/2020

ABSTRACT Gully erosion is a severe way of land degradation. Gullies threaten the sustainability of agro-ecosystems, causing quantitative and qualitative reduction of groundwater, farmland productivity, and waterways sedimentation. Since the gully development on the surface begins with water flow and sheet erosion, accurate monitoring of the erosive processes in a gully system and its quantification is key for the development of effective strategies to control soil erosion in gullies. Here, we demonstrate the first use of unmanned aerial vehicle (UAV) […]

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Evaluation of traditional methods for estimating lime requirement in Brazilian soils

Welldy Gonçalves Teixeira ORCID logo , V Víctor Hugo Alvarez ORCID logo , Júlio César Lima Neves ORCID logo , Rodrigo Bazzarella Paulucio ORCID logo

11/Nov/2020

ABSTRACT The optimal soil pH for most annual crops in Brazil varies between 5.7 and 6.0. Numerous methods have been developed for estimating lime requirement (LR), but they vary widely in their predictions and fail to raise pH to desired values for optimum crop production in the highly weathered soils of Brazil. The objectives of this study were to (i) compare seven traditional methods for estimating LR in Brazilian soils; (ii) assess the effects of LR predicted by these methods […]

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