Potencial de uso e qualidade estrutural de dois solos cultivados com cana-de-açúcar em Goianésia (GO)

Severiano, Eduardo da Costa; Oliveira, Geraldo César de; Curi, Nilton; Júnior, Moacir de Souza

doi:10.1590/s0100-06832009000100017

Cited by 32 publications

(33 citation statements)

References 15 publications

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“…It was observed that for the three depths and different land use systems considered, the precompression stress (σ p ) decreases exponentially with volumetric water content (θ), as similarly observed in previous other studies (Mosaddeghi et al, 2003;Peng et al, 2004;Severiano et al, 2009;Ajayi et al, 2011). Using the model proposed by Dias Junior & Pierce (1995) σ p = 10 (a + bθ) , where σ p is the precompression stress, "a" and "b" are empirical parameters of the adjustment of the model, and θ is the volumetric water content; representative load bearing capacity models for the different land use systems for the various depth were constructed (Figures 2 to 4).…”

Section: Resultssupporting

confidence: 87%

Structural sustainability of cambisol under different land use system

Martins¹,

Dias²,

Ajayi

et al. 2012

Rev. Bras. Ciênc. Solo

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SUMMARYIncongruous management techniques have been associated with some significant loss of agricultural land to degradation in many parts of the world. Land degradation results in the alteration of physical, chemical and biological properties of the soil, thereby posing a serious threat to sustainable agricultural development. In this study, our objective is to evaluate the changes in a Cambisol structure under six land use systems using the load bearing capacity model. Sampling was conducted in Amazonas Region, Brazil, in the following land use: a) young secondary forest; b) old secondary forest; c) forest; d) pasture; e) cropping, and f) agroforestry. To obtain the load bearing capacity models the undisturbed soil samples were collected in those land use systems and subjected to the uniaxial compression test. These models were used to evaluate which land use system preserved or degraded the Cambisol structure. The results of the bulk density and total porosity of the soil samples were not adequate to quantify structural degradation in Cambisol. Using the forest topsoil level (0-0.03 m) as a reference, it was observed that pasture land use system was most severe in the degradation of the soil structure while the structure were most preserved under old secondary forest, cropping system and forest. At the subsoil level (0.10-0.13 m depth), the soil structure was most degraded in the cropping land use system while it was most preserved in young secondary forest and pasture. At the 0.20-0.23 m depth, soil structure degradation was most severe in the old secondary forest system and well preserved in young secondary forest, cropping and agroforestry.Index terms: structure degradation, bulk density, precompression stress, Amazonas.(

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Section: Resultssupporting

confidence: 87%

Structural sustainability of cambisol under different land use system

Martins¹,

Dias²,

Ajayi

et al. 2012

Rev. Bras. Ciênc. Solo

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“…Essa característica do solo em questão deve ser analisada com cautela no manejo adotado, por se tratar de poros de retenção da água disponível às plantas (Mello et al, 2002;Severiano et al, 2009).…”

Section: Resultsunclassified

Qualidade física de neossolo quartzarênico submetido a diferentes sistemas de uso agrícola

Sales¹,

Severiano

Oliveira

et al. 2010

Ciênc. agrotec.

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RESUMOApesar da existência de informações descritivas sobre solos arenosos das regiões tropicais, àquelas referentes ao manejo e conservação são escassas. No presente estudo, objetivou-se avaliar as alterações dos atributos físico-hídricos de um Neossolo Quartzarênico Órtico em função do uso e manejo com vistas à definição de sistemas de manejo sustentáveis. O estudo foi conduzido no município de Mineiros, GO, em áreas submetidas a cinco sistemas de uso e manejo do solo, sendo: Pastagem (PAS), Plantio direto de Soja (PDS) e de milho (PDM), Integração agricultura-pecuária (IAP) e cerrado nativo (CER). Coletaram-se cinco amostras por sistema nas camadas de 0 a 10 e 10 a 20 cm no inverno de 2005 e verão de 2006, para avaliação da densidade do solo, micro e macroporosidade e condutividade hidráulica do solo saturado. Os atributos físico-hídricos avaliados não variaram com a época de amostragem. Os valores de microporosidade indicam baixa retenção da água disponível às plantas. O uso agrícola do solo promoveu alterações em todos os atributos avaliados. A macroporosidade do solo foi o atributo mais sensível às alterações estruturais decorrentes do manejo, contudo, sem apresentar valores considerados limitantes ao crescimento das plantas. A redução da condutividade hidráulica do solo saturado em áreas de atividade antrópica comprometeu a qualidade do solo e pode afetar a recarga do lençol freático e aumentar o processo erosivo. A manutenção da cobertura vegetal do solo é considerada medida-chave para exploração agropecuária nessas áreas.Termos para indexação: Manejo de solos arenosos, plantio direto, integração lavoura pecuária, alterações estruturais do solo. ABSTRACTIn spite of the existence of descriptive information on sandy soils in tropical areas, information regarding management and conservation is scarce. The present study aimed at evaluating changes in the physical-hydric attributes of Orthic Quartzarenic Neosol resulting from use and management having in view the definition of sustainable management systems. The study was carried out in the municipal district of Mineiros, GO, in areas submitted to five systems of use and management of the soil: pasture (PAS), soybeans under no-till (PDS), corn under no-till (PDM), agriculture-livestock integration (IAP), and native savannah (NSAV). Five samples were collected per area, at the depths of 0-10 and 10-20 cm, in the winter of 2005 and in the summer of 2006, for evaluation of bulk density, micro and macroporosity, and saturated soil hydraulic conductivity. The physical-hydric attributes evaluated did not vary within the sampling period. Microporosity values indicate low retention of the water available to the plants. Agricultural land use of the soil promoted alterations in all the appraised attributes. The macroporosity of the soil was the attribute most sensitive to structural changes resulting from management, but it did not, however, present values considered limiting to plant growth. The reduction of saturated soil hydraulic conductivity in human activity area...

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“…The characterization of those properties is of great importance for the proper management and conservation of soils (Severiano et al, 2009). For that, several laboratory analyses of different levels of complexity are employed, which helps making decisions on the correct management required according to the needs of the crops, so that the agricultural production may be increased (Lopes;Guilherme, 2016).…”

Section: Introductionmentioning

confidence: 99%

Multiple linear regression and random forest to predict and map soil properties using data from portable X-ray fluorescence spectrometer (pXRF)

et al. 2017

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Determination of soil properties helps in the correct management of soil fertility. The portable X-ray fluorescence spectrometer (pXRF) has been recently adopted to determine total chemical element contents in soils, allowing soil property inferences. However, these studies are still scarce in Brazil and other countries. The objectives of this work were to predict soil properties using pXRF data, comparing stepwise multiple linear regression (SMLR) and random forest (RF) methods, as well as mapping and validating soil properties. 120 soil samples were collected at three depths and submitted to laboratory analyses. pXRF was used in the samples and total element contents were determined. From pXRF data, SMLR and RF were used to predict soil laboratory results, reflecting soil properties, and the models were validated. The best method was used to spatialize soil properties. Using SMLR, models had high values of R² (≥0.8), however the highest accuracy was obtained in RF modeling. Exchangeable Ca, Al, Mg, potential and effective cation exchange capacity, soil organic matter, pH, and base saturation had adequate adjustment and accurate predictions with RF. Eight out of the 10 soil properties predicted by RF using pXRF data had CaO as the most important variable helping predictions, followed by P 2 O 5 , Zn and Cr. Maps generated using RF from pXRF data had high accuracy for six soil properties, reaching R 2 up to 0.83. pXRF in association with RF can be used to predict soil properties with high accuracy at low cost and time, besides providing variables aiding digital soil mapping.Index terms: Soil analyses; spatial prediction; proximal sensor. RESUMOA determinação de atributos do solo auxilia no correto manejo da sua fertilidade. O equipamento portátil de fluorescência de raios-X (pXRF) foi recentemente adotado para determinar o teor total de elementos químicos em solos, permitindo inferências sobre atributos do solo. No entanto, esses estudos ainda são escassos no Brasil e em outros países. Os objetivos deste trabalho foram prever atributos do solo a partir de dados do pXRF, comparando-se os métodos de regressão linear múltipla stepwise (SMLR) e de random forest (RF), além de mapear e validar atributos do solo. 120 amostras de solo foram coletadas em três profundidades e submetidas a análises laboratoriais. Utilizou-se o pXRF para leitura das amostras e determinou-se o teor total de elementos. A partir dos dados do pXRF, foram utilizadas SMLR e RF para predizer resultados laboratoriais, que refletem atributos do solo, e os modelos foram validados. O melhor método foi utilizado para espacializar os atributos do solo. Utilizando SMLR, os modelos apresentaram valores elevados de R² (≥0,8), porém maior acurácia foi obtida na modelagem com RF. A capacidade de troca de cátions potencial e efetiva, matéria orgânica do solo, pH, saturação por bases e teores trocáveis de Ca, Al e Mg apresentaram ajustes adequados e predições acuradas com RF. Dos dez atributos do solo preditos por RF a partir de dados do pXRF, sete apr...

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Potencial de uso e qualidade estrutural de dois solos cultivados com cana-de-açúcar em Goianésia (GO)

Cited by 32 publications

References 15 publications

Structural sustainability of cambisol under different land use system

Structural sustainability of cambisol under different land use system

Qualidade física de neossolo quartzarênico submetido a diferentes sistemas de uso agrícola

Multiple linear regression and random forest to predict and map soil properties using data from portable X-ray fluorescence spectrometer (pXRF)

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