Variabilidade espacial de atributos químicos do solo sob cafeeiro Conilon: relação com textura, matéria orgânica e relevo

Burak, Diego Lang; Passos, Renato Ribeiro; Andrade, Felipe Vaz

doi:10.1590/s0006-87052012000400012

Cited by 12 publications

(11 citation statements)

References 21 publications

(18 reference statements)

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“…Esse resultado indica que o manejo do solo não está melhorando a disponibilidade dos nutrientes para a planta. Ao interpretar a variação dos dados em torno da média, pode-se constatar o menor CV para o pH, fósforo (P) e matéria orgânica (MO) em comparação a m, V e SB, indicando a falta de interação com a adubação/ calagem e do manejo dos restos vegetais, conforme a literatura (VIEIRA et al, 2011;BURAK et al, 2012).…”

Section: Resultsunclassified

Variabilidade espacial de atributos químicos em Latossolo cultivado de modo convencional com soja no cerrado piauiense

Matías¹,

Nóbrega²,

Nóbrega³

et al. 2015

Agro@mbiente

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Resumo: O conhecimento da distribuição espacial dos atributos do solo permite manejar a área de acordo com as necessidades da cultura, minimizando ao máximo o custo para produtor. Objetivou-se com o presente estudo avaliar a variabilidade espacial de alguns atributos químicos em Latossolo Amarelo distrófico cultivado de modo convencional com soja no cerrado piauiense. O trabalho foi realizado no município de Currais, PI, em área de produção de soja, sob sistema de cultivo convencional, safra 2011/2012. Para a realização do estudo foram retiradas amostras de solo na camada de 0,00-0,20 m, em um grid, com intervalo regular de 200 m entre pontos de amostragem, totalizando 50 pontos, sendo cada ponto representado por oito subamostras. Foram avaliados o pH (H 2 O), matéria orgânica, fósforo disponível, potássio, cálcio, magnésio, hidrogênio + alumínio. Com os valores obtidos calculou-se a capacidade de trocas de cátions (CTC) a pH 7,0, soma de bases (SB), saturação por alumínio (m%) e saturação por bases (V%). Os menores coeficientes de variação foram verificados para pH, matéria orgânica e capacidade de troca catiônica, tendo todas as variáveis analisadas apresentado dependência espacial, indicando que o número de amostra (50) foi suficiente para mapear a área em estudo, utilizando-se técnicas de geoestatística. A utilização da geoestatística e a construção dos mapas por meio da krigagem permitem identificar zonas de manejo específico, com maiores e/ou menores valores de determinada variável. Palavras-chave: Fertilidade do solo. Geoestatísitica. Manejo específicoAbstract: The Knowledge of the spatial distribution of soil characteristics allows handling area in accordance with the needs of the crop, while minimizing to the maximum the cost to the producer. The objective of the present study was to evaluate the spatial variability of some chemical attributes in a dystrophic Yellow Latosol (Oxisol) cultivated conventionally with soybeans in Piauí Savanna. The work was conducted in the municipality of Currais, PI, Brazil, in an area of soybean production under conventional cropping system, 2011/2012. For the study, soil samples were taken in the 0.00-0.20 m layer, on a grid with regular interval of 200 m between sampling points, totaling 50 points, each point being represented by eight subsamples. Organic matter, pH in water, available phosphorus, potassium, calcium, magnesium, hydrogen and aluminum were evaluated. With the values calculated the cation-exchange capacity (CEC) at pH 7.0, sum of bases (BS), e saturation aluminum (m%) and bases saturation (V%). Lower coefficients of variation were checked for pH, organic matter and cation exchange capacity, and all variables were spatially dependent, indicating that the sample number (50) was sufficient to map the study area, using geostatistical techniques. The use of geostatistics and construct maps by kriging identifying specific areas of management, with larger and/or smaller values of a given variable.

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Section: Resultsunclassified

Variabilidade espacial de atributos químicos em Latossolo cultivado de modo convencional com soja no cerrado piauiense

Matías¹,

Nóbrega²,

Nóbrega³

et al. 2015

Agro@mbiente

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“…In the coffee crop, there are several studies related to soil sampling in precision agriculture (OLIVEIRA et al, 2008;BURAK et al, 2012;FERRAZ et al, 2015). However, for traditional sampling, still widely used by small and medium farmers, there are few studies that evaluate soil sampling methods, especially for coffee.…”

Section: Resultsmentioning

confidence: 99%

Sites and Sampling Tools in the Soil Fertility Evaluation of Coffee Plants in Production

Mantovani

Lima

Garcia

et al. 2019

C.Sci.

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In soil sampling, the collection site and the tool used may induce errors that can compromise the results of the chemical analysis and, consequently, the definition of corrective and fertilizer doses. The objective in this study was to evaluate soil sampling sites and tools in a coffee growing area. The experiment was carried out in a field in the municipality of Alfenas-MG, in a 35-year coffee field. A randomized block design was used in a 3 x 5 factorial scheme and 4 replications, totaling 60 experimental units. The treatments consisted of 3 sampling sites: in the fertilizer strip (located in the projection of the plant canopy); between rows; and in the total area, with 1/3 of the samples collected under the canopy and close to the plant stem, 1/3 in the canopy projection and 1/3 collected between rows; and 5 sampling tools: Dutch auger; screw auger; probe; hoe and drill. Soil samples were collected at a depth of 0 to 0.2 m, and each composite sample was obtained by assembling and mixing 20 single samples. At each sampling point, an area of 2m2 was delimited, in which simple samples were collected in all the evaluated places and with all the tools used. The following parameters were determined in the soil samples: pH in CaCl2; potential acidity (H+Al); organic matter; P, extracted by Mehlich; K+, Ca2+, Mg2+ and base saturation. In a coffee-growing area, he fertilizer strip (canopy projection) has topsoil with higher acidity and lower contents of organic matter and nutrients P, K+, Ca2+ and Mg2+ than between rows. The tools used for soil sampling do not influence the results of soil chemical analysis in the coffee-growing area.

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“…The slope increased the flow of runoff and regions with steeper slopes are residually enriched in coarse sand. The surface runoff of the organic material and the finest fraction, such as clay, in regions with higher slopes has been highlighted in the literature (WALTON et al, 2000;BURAK et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Quality indices in degraded pasture in hilly relief

et al. 2015

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Due to the influence of relief on soil variability, homogenous pedogenetic conditions have been recommended for developing soil quality indices based on their chemical, physical and biological attributes. This limits the development and application of an index to the same pedoenvironment in hilly relief. The present work aimed to evaluate the soil coverage and soil chemical and physical attributes as indicators of quality related to visual aspects of pasture degradation and contextualizing the influence of the relief. For this purpose, degradation levels were separated from visual aspects, and soil coverage as well as soil chemical and physical attributes were evaluated. Such levels were less subjectively defined, with the discriminant functions generated using information from soil coverage. Factor Analysis showed that altitude and slope explain a lower proportion of the total variation of the data. On the other hand, slope variations control the majority of soil attribute variations, especially the physical attributes that do not present a clear and direct relationship with degradation levels, which makes it difficult to use these attributes as indicators of quality. This relationship with the soil attributes is differentiated mainly as a function of the sun-facing slope: on the East/South facing slope, a greater relationship was observed for the physical attributes and plant cover, which was not observed on the West/North facing slopes. The influence of hilly relief on controlling solar radiation and soil moisture modifies the soil-vegetation relationship dynamic. As such, on hilly relief the measure of plant cover and use of discriminant functions becomes a more efficient way to discriminate among degradation levels, with environmental factors (temperature, solar radiation and soil moisture) also influencing pasture quality. Key words: Soil coverage, chemical and physical attributes of soil, multivariate analysis, soil degradation ResumoDevido à influência do relevo na variabilidade do solo, condições pedogenéticas homogêneas têm sido recomendadas para desenvolvimento de índices de qualidade do solo baseados em seus atributos químicos, físicos e biológicos. Tal fato limita o desenvolvimento e aplicação de um índice para um mesmo pedoambiente de relevo mais acidentado. O presente trabalho teve como objetivo avaliar a cobertura do solo e atributos químicos e físicos do solo como indicadores de qualidade relacionandoos com aspectos visuais de degradação das pastagens e contextualizando a influência do relevo. Para tanto, separaram-se níveis de degradação a partir de aspectos visuais, avaliou-se a cobertura do solo, atributos químicos e físicos do solo. Tais níveis foram definidos de forma menos subjetiva a partir das funções discriminantes geradas utilizando-se informações da cobertura do solo. Pela Análise de Fatores observa-se que altitude e faces de exposição ao sol estão relacionadas à explicação de uma menor proporção da variação total dos dados. Em contrapartida, a declividade controla a maior pa...

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Variabilidade espacial de atributos químicos do solo sob cafeeiro Conilon: relação com textura, matéria orgânica e relevo

Cited by 12 publications

References 21 publications

Variabilidade espacial de atributos químicos em Latossolo cultivado de modo convencional com soja no cerrado piauiense

Variabilidade espacial de atributos químicos em Latossolo cultivado de modo convencional com soja no cerrado piauiense

Sites and Sampling Tools in the Soil Fertility Evaluation of Coffee Plants in Production

Quality indices in degraded pasture in hilly relief

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