3296 results

Physicogenic and biogenic aggregates under different management systems in the Cerrado region, Brazil

Luiz Alberto da Silva Rodrigues Pinto ORCID logo , José Luiz Rodrigues Torres ORCID logo , Igor de Sousa Morais ORCID logo , Robert Ferreira ORCID logo , Wanderson Farias da Silva Júnior ORCID logo , Sandra de Santana Lima ORCID logo , [...]

23/Apr/2021

ABSTRACT An important strategy for the sustainable management of Cerrado soils is no-till (NT) systems, which may improve soil properties, particularly aggregation. Soil aggregates can be categorized according to their formation pathways into physicogenic (Phy) and biogenic (Bio). This study aimed (i) to quantify the relative proportion of physicogenic and biogenic aggregates and (ii) evaluate the levels of total organic carbon and their respective humic and physical fractions in the aggregates’ formation pathways. The following managed and unmanaged sites were […]

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A teachers’ formative process in soil education takes place while integrated to their life stories

Selma Barbosa Bastos ORCID logo , Fabiane Machado Vezzani ORCID logo , Valentim da Silva ORCID logo , Marcelo Ricardo de Lima ORCID logo

07/Apr/2021

ABSTRACT The teacher’s formative process is developed by a critical reflective response to the paths of life, the profession, and its practices. The teacher’s formative process analysis should consider the process’s objectives (theoretical, practical, and emancipatory), and the dimensions that make up the teacher (person, practices, and profession). As a result, this study aims to introduce the elements that outline the categories stemming from the relationship matrix between the objectives and the dimensions, and use them to analyze a formative […]

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Andic properties in soils with histic horizon “O” in the highlands of Southern Brazil

Jaime Barros dos Santos Junior ORCID logo , Jaime Antonio de Almeida ORCID logo

31/Mar/2021

ABSTRACT Soils with andic properties are characterized by a low apparent density, variable charges, large amounts of allophanes, imogolite, ferrihydrite, and/or organo-metallic complexes with Al, and present high phosphate retention. Soils derived from non-pyroclastic materials rich in silicates, formed under a cold and humid climate, a large amount of organic carbon, acid weathering, andic properties can manifest when a large amount of Al is present in the form of organo-metallic complexes. This study aimed to evaluate the characteristics and geographical […]

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Refining phosphorus fertilizer recommendations based on buffering capacity of soils from southern Brazil

Gilmar Luiz Mumbach ORCID logo , Luciano Colpo Gatiboni ORCID logo , Daniel João Dall’Orsoletta ORCID logo , Djalma Eugenio Schmitt ORCID logo , Douglas Luiz Grando ORCID logo , Abelino Anacleto de Souza Junior ORCID logo , [...]

16/Mar/2021

ABSTRACT The phosphorus (P) rates recommended for corrective fertilization-P of soils from southern Brazil may be insufficient to reach the critical level for optimal plant growth. This study aimed to quantify the fertilizer-P rates for total correction fertilization with varying soil buffering capacity in the states of Rio Grande do Sul (RS) and Santa Catarina (SC). Soil samples from 0.00-0.10 and 0.10-0.20 m layers were collected from 41 locations distributed in both states. Twelve P rates were applied to each […]

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Soil spectral library of Piauí State using machine learning for laboratory analysis in Northeastern Brazil

Wanderson de Sousa Mendes ORCID logo , Cácio Luiz Boechat ORCID logo , Adriano Venicius Santana Gualberto ORCID logo , Ronny Sobreira Barbosa ORCID logo , Yuri Jacques Agra Bezerra da Silva ORCID logo , Paloma Cunha Saraiva ORCID logo , [...]

10/Mar/2021

ABSTRACT Soil chemical and physical analyses are the major sources of data for agriculture. However, traditional soil analyses are time-consuming, not cost-efficient, and not environmentally friendly. An alternative to traditional soil analyses is soil spectroscopy. This technique is a low-cost and quick analytical method, which can be implemented in a laboratory and/or in-situ. Nevertheless, some spectrometers are expensive and do not contemplate the entire spectrum. Despite this limitation, the main objective of the study was to create a soil spectral […]

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Training pedologist for soil mapping: Contextualizing methods and its accuracy using the project pedagogy approach

Elias Mendes Costa ORCID logo , Marcos Bacis Ceddia ORCID logo , Felipe Nascimento dos Santos ORCID logo , Laiz de Oliveira Silva ORCID logo , Igor Prata Terra de Rezende ORCID logo , Douglath Alves Correa Fernandes ORCID logo

10/Mar/2021

ABSTRACT There is a growing demand for more detailed knowledge about soils, their functions, and connections with human activities and environmental services. In Brazil, where soil survey and mapping have been scarce since the 1990s, there is a remarkable sense of urgency. Recently, a national soil program was created (PronaSolos) to attend to the massive demand for soil information. PronaSolos is an effort to return to the systematic soil mapping of the national territory, which requires many pedologists who master […]

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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/Feb/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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Universality of Kenworthy and DRIS norms for prata and cavendish bananas grown in two environments

Vagner Alves Rodrigues Filho ORCID logo , Júlio César Lima Neves ORCID logo , Sérgio Luiz Rodrigues Donato and ORCID logo , Bruno Vinícius Castro Guimarães ORCID logo

05/Feb/2021

ABSTRACT Tissue analysis results are interpreted by comparing them with nutrient standards; however, using universal standards may lead to a misleading nutritional diagnosis. This study aimed to evaluate the degree of universality of Kenworthy and DRIS norms for irrigated ‘Prata-Anã’ (AAB) and ‘Grande Naine’ (AAA) banana plants grown in two environments. The study was carried out using a database containing leaf nutrient contents and yield data of two farms located in Ponto Novo, Bahia State, and Missão Velha, Ceará State, […]

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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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Phytomass input and nutrient cycling under different management systems in dwarf cashew cultivation

Gislane Mendes de Morais ORCID logo , José Ferreira Lustosa Filho ORCID logo , João Paulo Bezerra Saraiva ORCID logo , Helon Hebano de Freitas Sousa ORCID logo , Júlio César Lima Neves ORCID logo , Eduardo de Sá Mendonça ORCID logo , [...]

27/Nov/2020

ABSTRACT Rational management of spontaneous plants is an alternative for increasing productivity in tree crops. This study aimed to evaluate the impact of management systems between rows and under the canopy of early dwarf cashew trees on the soil chemical properties and light-fraction organic matter and cashew root systems; we also evaluated the nutrient inputs from the spontaneous plants phytomass and cashew leaves deposited on an Arenic Kandiustults. The management systems under study were disc harrowing (DH) and mechanical mowing […]

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