Variabilidade espacial de atributos químicos do solo em áreas sob sistema plantio convencional

Machado, Leonardo de Oliveira; Lana, Ângela Maria Quintão; Lana, Regina Maria Quintão; Guimarães, Ednaldo Carvalho; Ferreira, Carla Virgínia

doi:10.1590/s0100-06832007000300019

Cited by 54 publications

(55 citation statements)

References 12 publications

(10 reference statements)

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“…Similar results were obtained by Corá et al (2004) the variability in K + content was only high in the 0.1-0.2 m layer, while that of h + al was high in both layers (table 1). Similar results for h + al content were obtained by Corá et al (2004) in a Rhodic eutrudox under conventional tillage and also by Machado et al (2007) in a Rhodic eutrudox under conventional tillage. the variability found for the K + content was similar to the value reported by Corwin et al (2006) in a natrargid under a forage crop.…”

Section: Resultssupporting

confidence: 85%

Spatial relationships between soil attributes and corn yield in no-tillage system

Rodrigues¹,

Corá

Fernandes

2012

Rev. Bras. Ciênc. Solo

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SummaRYSoil properties play an important role in spatial variability of crop yield. however, a low spatial correlation has generally been observed between maps of crop yield and of soil properties. the objectives of the present investigation were to assess the spatial pattern variability of soil properties and of corn yield at the same sampling intensity, and evaluate its cause-and-effect relationships.

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Section: Resultssupporting

confidence: 85%

Spatial relationships between soil attributes and corn yield in no-tillage system

Rodrigues¹,

Corá

Fernandes

2012

Rev. Bras. Ciênc. Solo

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“…Thus all chemical properties analyzed had a strong or moderate spatial dependence degree. Similar results were found by Silva et al (2003), Machado et al (2007) and Zanão Júnior et al (2007), which highlights the importance of knowledge on spatial dependence structures. Table 3.…”

Section: Soil Chemical Propertiessupporting

confidence: 86%

Spatial and temporal variability of crop yield and some Rhodic Hapludox properties under no-tillage

Filho¹,

Vieira

Chiba

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYSoil properties are closely related with crop production and spite of the measures implemented, spatial variation has been repeatedly observed and described. Identifying and describing spatial variations of soil properties and their effects on crop yield can be a powerful decision-making tool in specific land management systems. The objective of this research was to characterize the spatial and temporal variations in crop yield and chemical and physical properties of a Rhodic Hapludox soil under no-tillage. The studied area of 3.42 ha had been cultivated since 1985 under no-tillage crop rotation in summer and winter. Yield and soil property were sampled in a regular 10 x 10 m grid, with 302 sample points. Yields of several crops were analyzed (soybean, maize, triticale, hyacinth bean and castor bean) as well as soil chemical (pH, Soil Organic Matter (SOM), P, Ca 2+ , Mg 2+ , H + Al, B, Fe, Mn, Zn, CEC, sum of bases (SB), and base saturation (V %)) and soil physical properties (saturated hydraulic conductivity, texture, density, total porosity, and mechanical penetration resistance). Data were analyzed using geostatistical analysis procedures and maps based on interpolation by kriging. Great variation in crop yields was observed in the years evaluated. The yield values in the Northern region of the study area were high in some years. Crop yields and some physical and soil chemical properties were spatially correlated.Index terms: crop yield maps, geostatistics, kriging.(1) Part of the master dissertation of the primary author developed at the IAC Tropical and Sub-tropical Agriculture Graduate Program, Campinas (SP (pH, MOS, P, Ca, Mg, H + Al, B, Fe, Mn, Zn, CTC, SB e V %)

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“…No entanto, o estudo geoestatístico de um conjunto de dados não exige que esses tenham distribuição normal (Corá & Beraldo, 2006); a normalidade deste conjunto de dados possibilita, porém, melhor ajuste do semivariograma, além de facilitar este processo (Machado et al, 2007) o que, segundo Isaaks & Srivastava (1989) a ocorrência ou não do efeito proporcional, em que a média e a variabilidade dos dados são constantes na área estudada, é de maior relevância que a normalidade da frequência de distribuição dos dados. Assim, torna-se possível, através da análise exploratória dos dados admitir, em princípio, que os dados estão suficientemente simétricos para o estudo geoestatístico.…”

Section: Resultsunclassified

“…O baixo CV observado para o pH corrobora com os resultados encontrados por Cavalcante et al (2007), Machado et al (2007) e Souza et al (2008); entretanto, contrasta com o resultado encontrado para o CV do P. O valor do CV do pH pode ser atribuído ao fato desta variável ser mensurada em uma escala pequena de valores e ser uma função logarítmica e o do P a sua baixa mobilidade no solo. Os valores médios e alto de CV dos demais atributos químicos do solo concordam com os resultados encontrados por Lima et al (2010) Souza et al (2006), resultados esses propiciados por se tratar de estudo de áreas distintas, quanto à sua cobertura vegetal, ao manejo e nível de degradação o que influencia, dentre outros processos, a decomposição de restos culturais e da serapilheira dos estratos arbóreos provocando, assim, alta variabilidade nos atributos do solo.…”

Section: Resultsunclassified

Análise espacial de atributos do solo e cobertura vegetal em diferentes condições de pastagem

Neto

Santos

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOAs áreas destinadas à pecuária têm-se expandido sobre áreas de vegetação nativa promovendo transformações na qualidade do solo. O objetivo foi avaliar os atributos de um Neossolo Quartzarênico sob diferentes coberturas vegetais para saber se a degradação do pasto representa a degradação do solo. As áreas avaliadas foram: floresta nativa; capoeira; pastagem sem controle de lotação animal; pastagem em pousio; pastagem com invasoras; pastagem degradada com solo descoberto e invasoras, pastagem degradada com invasoras e espécies arbóreas e pastagem com baixa produção de forragem. Todas as pastagens eram formadas pela gramínea Brachiaria brizantha cv. Marandu. Realizaram-se 128 amostras de solo nas profundidades de 0-5 e 5-10 cm, dentro de cada área de manejo considerada como parcela experimental e a cobertura do solo foi quantificada. Foram mensuradas propriedades químicas e físicas do solo. Os dados foram submetidos a estudo geoestatístico. Foram constatados aumento na resistência mecânica à penetração e diminuição nos teores de matéria orgânica nas áreas mais degradadas. Pasto degradado não representa necessariamente solo degradado enquanto solo degradado está relacionado a pastagem degrada.Palavras-chave: degradação ambiental, geoestatística, interface solo-planta, manejo de pastagem Spatial analysis of soil attributes and cover vegetation under different grazing conditions ABSTRACT The areas for livestock raising have expanded into areas of native vegetation, promoting changes in soil quality. The objective of this study was to evaluate the attributes of a Entisol under different vegetation covers to whether the pasture degradation represents soil degradation. The areas evaluated were: native forest, shrub, uncontrolled grazing animal stocking, grazing in fallow pasture with weeds; degraded pasture with bare soil and weeds, degraded pasture with weeds and tree species and grassland with low forage production. All pastures were formed by Brachiaria brizantha cv. Marandu. Hundred and twenty eight soil samples were collected in 0-5 and 5-10 cm, within each management area, considered as an experimental plot and soil cover was quantified. The chemical and physical properties of the soil were measured. Data were subjected to geoestatistical study. Increase in penetration resistance and decrease in the levels of organic matter were observed in the most degraded areas. Degraded pasture is not necessarily degraded land while degraded soil is related to grazing degrades.

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Variabilidade espacial de atributos químicos do solo em áreas sob sistema plantio convencional

Abstract: (1) Recebido para publicação em março de 2006 e aprovado em fevereiro de 2007.

Cited by 54 publications

References 12 publications

Spatial relationships between soil attributes and corn yield in no-tillage system

Spatial relationships between soil attributes and corn yield in no-tillage system

Spatial and temporal variability of crop yield and some Rhodic Hapludox properties under no-tillage

Análise espacial de atributos do solo e cobertura vegetal em diferentes condições de pastagem

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