Técnicas multivariadas na avaliação de atributos de um Latossolo vermelho submetido a diferentes manejos

Freitas, Ludmila de; Casagrande, José Carlos; Oliveira, Ivanildo Amorim de; Campos, Milton César Costa; Silva, Laércio Santos

doi:10.5039/agraria.v10i1a3928

Cited by 17 publications

(25 citation statements)

References 18 publications

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“…This analysis allows reducing the dimensions of the data in two components and, therefore, facilitates the interpretation plotted in a biplot graph (Freitas et al, 2015). PCA explained 81.07% of the total variance of the data (60.91% in PC1 and 20.16% in PC2).…”

Section: Resultsmentioning

confidence: 99%

“…The highest OM contents in native vegetation areas are explained by the greater contribution of organic residues (Portugal et al, 2010) since the anthropic interference, such as the use of agricultural implements and cultural practices, accelerates OM degradation (Freitas et al, 2015). Thus, PCA, in line with the univariate analysis, reinforces the intensive exploitation in areas under vegetable cultivation with agricultural inputs (fertilizers and agrochemicals), signaling possible contamination of water resources since crops grown in hillside areas facilitate the loss and accumulation of nutrients into water reservoirs.…”

Section: Resultsmentioning

confidence: 99%

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Chemical Changes of Soil and Water in Hillside Areas Under Intensive Horticulture

et al. 2018

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Chemical Changes of Soil and Water in Hillside Areas Under Intensive Horticulture

et al. 2018

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“…A diferenciação dos grupos foi marcante, apresentando maior similaridade entre eles, com o ambiente cana-de-açúcar e área reflorestada e o outro grupo somente pela mata nativa, mostrando as particularidades de cada ambiente, pois as características Distância Euclidiana Distância Euclidiana dos atributos de um mesmo grupo são semelhantes e diferentes do comportamento de outros agrupamentos (VALLADARES et al, 2008). Esse resultado deve-se ao fato de que devido ao ambiente adotado com cultivo de cana-de-açúcar e a área reflorestada se diferenciaram do ambiente natural que é a mata nativa, corroborando com os resultados encontrados por Freitas et al (2012), que trabalhando com estes mesmos ambientes, observaram a mesma divisão dos ambientes quando analisou os atributos físicos destes solos.…”

Section: Resultsunclassified

“…Na profundidade 0,10-0,20 m a duas primeiras CPs foram responsáveis 76,16% da variância dos dados originais, com 53,65% na CP1 e 22,5% na CP2. Freitas et al (2012), estudando os atributos físicos nestas mesmas características de solos, e Loss et al (2009) Os pesos entre as variáveis e as componentes principais permitiu caracterizar as variáveis que mais discriminaram na formação e diferenciação dos solos, conforme demonstra a Tabela 3.…”

Section: Resultsunclassified

Análises multivariadas de atributos químicos do solo para caracterização de ambientes.

et al. 2014

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Resumo -As alterações da cobertura vegetal e uso do solo promovem mudanças na quantidade e qualidade dos atributos químicos do solo e, consequentemente, no carbono orgânico do solo. Nesse contexto, objetivou-se com este trabalho avaliar as alterações dos atributos químicos de um Latossolo Vermelho distrófico submetido a diferentes manejos, utilizando a análise multivariada. Foram estudadas três áreas adjacentes (mata, cana-de-açúcar e área reflorestada), no município de Santa Ernestina (SP). Em cada área foram coletadas aleatoriamente quatro amostras de solo nas camadas de 0,0-0,1 m e 0,1-0,2 m de profundidade. Foram avaliados os atributos químicos: pH, matéria orgânica, cálcio, potássio, magnésio, alumínio, acidez potencial, enxofre, boro, cobre, ferro, manganês, e zinco. Em seguida os dados foram submetidos a análises estatísticas multivariadas. A classificação dos acessos em grupos foi feita por dois métodos: método de agrupamentos hierárquico e análise de componentes principais. As análises de agrupamentos e componentes principais permitiram identificar a formação de dois grupos, um formado pela mata nativa e o outro pela área em reflorestamento e a área cultivada com cana-de-açúcar. O uso das técnicas de multivariadas foi eficiente para verificar as similaridades e/ou diferenças das áreas estudadas. Os resultados indicam que o uso intensivo do solo diminui sua qualidade tendo como referência a vegetação nativa. Palavras-chave -Mata nativa. Área reflorestada. Cultura da cana-de-açúcar.Abstract -Changes in land cover and land use changes promote the quantity and quality of soil chemical properties and consequently on soil organic carbon. In this context, the aim of this work was to evaluate the changes of chemical properties of an Oxisol under different managements, using multivariate analysis. We selected three adjacent areas (forest, sugar cane and reforested area), in the municipality of Jaboticabal (SP). In each area, were collected, randomly, four samples, in layers of 0.0-0.10 m and 0.10-0.20 m. We evaluated the chemical attributes, such as: pH, organic matter content, potassium, calcium, magnesium, aluminum, potential acidity, sulfur, boron, copper, iron, manganese, zinc, of each sample in the two studied depths. The cluster analysis and principal components allowed identifying the formation of two groups, one formed by native forest, and the other by area in reforestation and the area planted with sugar cane. The cluster analyzes and principal component identify the native forest behaved differently and the reforested area planted to sugar cane, and area with cane sugar and reforested provided similar and different from the forest area native. The use of multivariate techniques was efficient to check for similarities or differences based on soil chemical properties in each environment studied.

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“…The amount of organic matter, represented by the carbon rate, exceeded the reference standard. This was explained by Freitas et al (2015) who affirmed that preparing and cultivating soil for crops cause mineralization of the organic matter owing to the accumulation of plant debris. In addition, the authors associate an increased cation exchange capacity (CEC) with an increased accumulation of organic matter, which explains the results found in this study.…”

Section: Characteristics Of Growth Field and Clove Basil Essential Oilmentioning

confidence: 99%

Antifungal activity, yield, and composition of Ocimum gratissimum essential oil

et al. 2017

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ABSTRACT. Ocimum gratissimum L. or clove basil, belongs to the Lamiaceae family, has various desirable uses and applications. Beyond its aromatic, seasoning, and medicinal applications, this plant also has antimicrobial activity. This study was aimed at assessing the antifungal activity, yield, and composition of the essential oil (EO) of O. gratissimum. The species was cultivated in garden beds with dystrophic red latosol soil type containing high organic-matter content. The EO was obtained by hydrodistillation of dried leaves in a modified Clevenger apparatus, followed by determination of its content. Chemical characterization was carried out by gas chromatographymass spectrometry (GC-MS). Microbial activity was assessed using the broth microdilution method, by determining the minimum inhibitory concentration (MIC), in order to compare the antimicrobial effect of EO in 10 isolates-Fusarium oxysporum f. sp tracheiphilum (CMM-0033), F. oxysporum f. sp. cubense (CMM-0813 and CMM-2819), F. oxysporum f. sp lycopersici (CMM-1104), F. solani (CMM-3828), Rhizoctonia solani (CMM-3274), and Macrophomina phaseolina (CMM-2715, CMM-3875, CMM-3615, and CMM-3650). The EO was a highly effective inhibitor of the studied phytopathogenic fungi, with MICs varying from 31.25 to 125 µg/mL. F. oxysporum f. sp lycopersici and R. solani were the most sensitive; both were inhibited at an MIC of 31.25 µg/mL. The EO content in the plant extract was 0.18%. Thirty chemical compounds were detected via GC-MS, with linalool (32.9%) being the major compound followed by 1,8-cineole (21.9%), both oxygenated monoterpenes. It can be concluded that clove basil EO is a highly effective antifungal agent, and therefore, a potential alternative for the control of plant pathogenic diseases.

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Técnicas multivariadas na avaliação de atributos de um Latossolo vermelho submetido a diferentes manejos

Cited by 17 publications

References 18 publications

Chemical Changes of Soil and Water in Hillside Areas Under Intensive Horticulture

Chemical Changes of Soil and Water in Hillside Areas Under Intensive Horticulture

Análises multivariadas de atributos químicos do solo para caracterização de ambientes.

Antifungal activity, yield, and composition of Ocimum gratissimum essential oil

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