Distribuição de agregados e carbono orgânico em um Argissolo Amarelo distrocoeso em diferentes manejos

Oliveira, V. S.; Rolim, Mário M.; Vasconcelos, Romero Falcão Bezerra de; Pedrosa, Elvira M. R.

doi:10.1590/s1415-43662010000900001

Cited by 13 publications

(13 citation statements)

References 16 publications

(16 reference statements)

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“…The non-significant effect on FM and MWD in the 0-0.20 m layer in this study corroborates other studies (Vicente et al, 2012;Oliveira et al, 2010), especially FM in areas cultivated with sugarcane and without vinasse application (Vicente et al, 2012). FM and MWD were not good indicators to differentiate the conditions of native forest and soil fertigated with vinasse in the layers of 0-0.20 m and 0.20-0.40 m (Oliveira et al, 2010), confirming the better applicability of FM to evaluate dry aggregate stability.…”

Section: Resultssupporting

confidence: 92%

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Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Tavares

Rolim

Neto

et al. 2017

Rev. bras. eng. agríc. ambient.

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Evaluation of mobilized soil profiles can provide important information on soil compaction reduction processes. In this context, the objective of this study was to evaluate alterations in soil penetration resistance and the impact on the aggregate stability of a cohesive Ultisol cultivated with sugarcane. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC/UFRPE), located in the city of Carpina, PE. Penetration resistance, mobilized area and depth, and percentage of soil aggregates were evaluated before and after soil tillage. Soil mobilization improved soil aggregate uniformity and decreased penetration resistance in the 0-0.20 m layer. Coarse soil fraction, moisture and organic carbon positively contributed to the increase in soil mobilization.

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Section: Resultssupporting

confidence: 92%

“…FM and MWD were not good indicators to differentiate the conditions of native forest and soil fertigated with vinasse in the layers of 0-0.20 m and 0.20-0.40 m (Oliveira et al, 2010), confirming the better applicability of FM to evaluate dry aggregate stability.…”

Section: Resultsmentioning

confidence: 86%

Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Tavares

Rolim

Neto

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…O ensaio normal de Proctor foi realizado através de um cilindro de Proctor para obtenção da densidade seca máxima de compactação (D smax ) e da umidade crítica (Ucrit) (Oliveira et al, 2010b).…”

Section: Methodsunclassified

“…O grau de compactação (GC) foi definido pela relação entre a densidade do solo (Ds) e a densidade seca máxima de compactação (D smax ), obtida pelo ensaio normal de Proctor (Oliveira et al, 2010b). Com os dados obtidos foram efetuados a estatística descritiva dos dados e o estudo de correlações simples entre algumas variáveis, utilizando-se o software Statistica (Statsoft, 2004).…”

Section: Methodsunclassified

Variabilidade espacial de atributos físicos e mecânicos de um Argissolo sob cultivo de cana-de-açúcar

Tavares¹,

Rolim

Pedrosa

et al. 2012

Rev. bras. eng. agríc. ambient.

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Propôs-se, neste trabalho, estudar a relação espacial de atributos físicos e mecânicos de um Argissolo Coeso cultivado com cana-de-açúcar. Estabeleceu-se um grid com 49 pontos georreferenciados para a retirada de amostras, em disposição 7 x 7, resultando uma malha de 120 x 120 m. As trincheiras foram abertas em duas camadas (0-20 e 20-40 cm) para a coleta das amostras deformadas e indeformadas. A distribuição normal foi verificada em todas as variáveis estudadas. Também se observou forte grau de dependência espacial para a maioria das variáveis. O limite de plasticidade apresentou efeito pepita puro. Os maiores alcances encontrados foram para o limite de liquidez (0-20 cm) e grau de compactação (0-20 cm) e os menores para umidade do solo (0-20 cm), IP e carbono orgânico (20-40 cm). Os mapas de krigagem apontaram correlação inversa entre densidade e porosidade e forte correlação entre argila e carbono orgânico, também entre a argila e os limites de consistência. Para a maioria das variáveis houve dependência espacial até 20 m indicando, para análises paramétricas, que as amostras devem ser coletadas em distâncias superiores a 20 m.

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“…13,14 O processo de agregação do solo é dinâmico, sendo necessário o aporte contínuo de resíduos vegetais para manter uma estrutura adequada ao desenvolvimento das plantas. 15 Os estudos de Arruda et al, 16 Vicente et al e Oliveira et al, [17][18] observaram correlação significativa positiva dos teores de C do solo com sua agregação.…”

Section: Introductionunclassified

Aggregation and Soil Carbon Aggregates Distribution in a Red Latosol under Different Levels of Sugarcane Straw in Paranavaí (PR)

Lopes¹,

Ziviani²,

Pinto³

et al. 2017

Rev. Virtual Quim.

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Abstract:The objective of this work was to evaluate the impact of the application of different levels of sugarcane straw on the aggregation and distribution of organic carbon (C) in aggregate classes of a Red Latosol under mechanical harvest in Paranavaí (PR). For this study, in November 2014, after the mechanical harvesting of cane-plant (variety RB-867515), the following amounts of straw were applied to the soil: 0.00, 3.65, 7.50, and 14.85 Mg ha -1 which corresponded respectively to field maintenance of 0, 25, 50 and 100% of the straw. The experimental design was a randomized block design, with 4 replicates. Approximately one year after application of straw levels on the soil, soil samples were collected in the 0-10 cm layer. In these samples the aggregate mean weight diameters (MWD), the aggregate distribution in the classes of diameters 4-2, 2-1, 1-0.5, 0.5-0.25, and 0.25-0.105 and <0.105 mm by dry route, and the C content in these classes with the exception of class <0.105 mm. In the distribution of the aggregates, there was a predominance of the 0.25-0.105 mm group of aggregates, possibly due to the amount of fine sand (290 g kg ) present in this sieve diameter, although within this class there was no significant effect of the levels of straw. The higher straw deposition on the soil (50 and 100%) increased the percentage of aggregates in the class 4-2 mm (25.7 and 32.0%, respectively) in relation to treatments 0 and 25% (13.5 and 22.7%, respectively), presenting significant quadratic behavior. The same effect was observed for the MWD values, with higher values in the treatments with 50 and 100% (1.65 and 1.60 mm, respectively) in relation to treatments with 25 and 0% straw (1.32 and 1.01 mm, respectively). Within each straw level, the C contents in the aggregate classes presented significant differences among them, except for the treatment with 100% straw, where in general the values were higher in the classes with diameter of 4-2 and 2-1 mm (12.5 and 12.4 g kg -1, respectively) and lower in the class 0.25-0.105 mm (6.6 g kg -1). Thus, the main conclusions were that the application of 50 and 100% (7.55 and 14.85 Mg ha -1 year -1) increases the aggregation of the soil, and that the application of 50% of straw on the soil also (4-2 and 2-1 mm), which are associated to higher soil organic carbon contents (14.4 and 13.2 g Kg -1 , respectively), straw level being more appropriate to keep the surface of the soil to maintain soil structure.Keywords: Management of sugarcane straw; aggregation; classes of aggregates; aggregate organic carbon. ResumoO objetivo desse trabalho foi avaliar o impacto da aplicação de diferentes níveis de palhada da cana-de-açúcar sobre a agregação e distribuição de carbono orgânico (C) em classes de agregados de um Latossolo Vermelho, sob colheita mecânica em Paranavaí (PR). Para esse estudo, em novembro de 2014, após a colheita mecanizada de cana-planta (primeira colheita após o plantio), variedade RB-867515, foram aplicados sobre o solo as seguintes quantidades de palha: 0, 3,65, 7,55...

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Distribuição de agregados e carbono orgânico em um Argissolo Amarelo distrocoeso em diferentes manejos

Cited by 13 publications

References 16 publications

Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol

Variabilidade espacial de atributos físicos e mecânicos de um Argissolo sob cultivo de cana-de-açúcar

Aggregation and Soil Carbon Aggregates Distribution in a Red Latosol under Different Levels of Sugarcane Straw in Paranavaí (PR)

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