Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Machado, Wesley; Telles, Tiago Santos; Filho, João Tavares; Guimarães, María de Fátima; Alves, Grace Bungenstab; Borges, José Luiz Bernardo

doi:10.1590/s0100-06832010000600004

Cited by 19 publications

(18 citation statements)

References 34 publications

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“…Soil tillage and the traffic of machines and agricultural implements modify the size of aggregates and the macropore/micropore ratio, with an increase in the proportion of small pores compared with large pores (SOARES; ESPINDOLA; CASTRO, 2005;ALBUQUERQUE et al, 2005;MACHADO et al, 2010) and implications in water infiltration into the soil and greater water retention by the soil and therefore, greater difficulty in release of water to plants, decreased gas exchange, and greater difficulty for root development. The objective of this study was to characterize the chemical and physical properties of soils in two topossequences derived from basaltic rocks in the state of Parana, with different slopes, aiming to identify the relationships between their attributes, relief, and parent material.…”

Section: Introductionmentioning

confidence: 99%

Toposequences of soils developed on basaltic rocks: physicochemical attributes

Gonçalves¹,

Filho²,

Vendrame³

et al. 2013

RCA

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Soils are formed in a structural continuity of layers along a toposequence. The objective of this study was to characterize the chemical and physical properties of soils in two topossequences derived from basaltic rocks in the state of Parana, with different slopes, aiming to identify the relationships between their attributes, relief, and parent material. We studied two toposequences, with differentiated reliefs, developed on parent material consisting of vesicular and aphanitic basaltic rocks. The following physical properties were evaluated: texture, bulk density, particle density, macroporosity, microporosity, aggregate stability in water, degree of dispersion, and degree of flocculation. Chemical analyses were carried out for determination of Ca, Mg, K, P, Al, H+Al, C, and ΔpH. The results were submitted to principal component analysis (PCA) to obtain the correlation circles. In the circle of eigenvectors, in the slope with soft undulating relief, most vectors are located in the negative sector, both for physical and chemical properties with the latter being closer together. Also, the relationships between Ca, Mg, K and aluminum are evident. This way, chemical and physical properties are listed in the two slopes, and the level of correlation depends on the existing interactions. In addition, young soils with different characteristics and behavior were different from the others. Effective depth and structure were limiting attributes, but other favorable attributes were observed. The relationships among the attributes are differentiated along the slopes, and are influenced by the physicochemical nature of the geological substrate. RESUMO: Os solos são formados em uma continuidade estrutural das camadas ao longo da topossequência. Assim, o objetivo deste trabalho foi caracterizar atributos químicos e físicos de solos em duas topossequências, originados de rochas basálticas, no Estado do

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Section: Introductionmentioning

confidence: 99%

Toposequences of soils developed on basaltic rocks: physicochemical attributes

Gonçalves¹,

Filho²,

Vendrame³

et al. 2013

RCA

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“…Por outro lado, Machado et al (2010) afirmaram que, em Latossolo Vermelho na camada de 0-0,20 m (387 g kg -1 de areia), o manejo da cana colhida mecanicamente (387 g kg -1 de areia) apresentou maiores porcentagens de agregados < 0,25 mm que aquelas relatadas em solos sob mata nativa (379 g kg -1 de areia). Comportamento similar foi verificado neste e para a mesma classe de agregado ao C7 e C8 na camada de 0-0,10 m (Tabela 1).…”

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Agregação de um Latossolo em função de diferentes ciclos de cultivo de cana-de-açúcar sob colheita mecanizada

et al. 2014

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Resumo -O tamanho dos agregados e o estado de agregação podem modificar a estrutura do solo, principalmente quando ocorre o manejo intensivo desse com o cultivo da cana-de-açúcar. Objetivou-se com esse estudo avaliar a influência de ciclos de cultivos de um canavial na agregação em diferentes profundidades de um Latossolo Vermelho distrófico típico, situado em Bebedouro (SP). Foram selecionados em março de 2012, três talhões de cana-de-açúcar colhida mecanicamente, sem queima, sendo: cana soca de um ciclo (C1), cana soca com sete ciclos (C7) e cana soca com oito ciclos (C8), e uma área adjacente de mata nativa (MN). O delineamento experimental foi em blocos casualizados com parcelas subdivididas, com quatro repetições. As áreas consistiram de parcelas e subparcelas sendo formadas pelas profundidades 0-0,10; 0,10-0,20 e 0,20-0,30 m. As variáveis avaliadas: diâmetro médio geométrico (DMG), diâmetro médio ponderado (DMP), índice de sensibilidade dos agregados (IS) e teor de matéria orgânica do solo. O ciclo C8 apresentou maiores DMG e DMP, mas semelhantes teores de MO em comparação com os demais ciclos de cana-de-açúcar, demonstrando que o tratamento C8 não foi prejudicial à estrutura do solo. O diâmetro médio geométrico apresentou pior correlação com a matéria orgânica do solo na camada de 0,10-0,20 m. Palavras-chave-Estabilidade de agregados. Matéria orgânica. Saccharum officinarum.Abstract -The size of aggregates and the aggregation state can modify the soil structure, especially when there is the intensive management of that with the sugarcane cultivation. The objective was to evaluate the influence cultivation cycles of sugarcane in the aggregation in the different layers of a typical Oxisol, located in Bebedouro, São Paulo State, Brazil. Three plots have been selected on March 2012 with sugarcane cycles harvested mechanically without previous sugarcane burning: sugarcane ratoon of one cycle (C1), sugarcane ratoon of seven cycles (C7) and sugarcane ratoon of eight cycles (C8), and an adjacent area of native forest (NF). The experimental design was a randomized block with split plot with four replications. Areas consisted of plots and subplots being formed by the depths 0-0.10, 0.10-0.20 and 0.20-0.30 m. The evaluated variables: mean geometric diameter (MGD), mean weight diameter (MWD), sensitivity index of the aggregates (IS) and organic matter content of soil (OM). The C8 cycle showed the highest MWD and MGD, similar levels of OM compared to the sugarcane ratoon cycles, it indicates that this treatment was not result in adverse effect to the soil structure even that has longer sugarcane ratoon cycles. The mean geometric diameter had a worse correlation with soil organic matter in the 0.10-0.20 m layer.

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“…In management systems without preharvest burning, part of the C from crop residues is stored in the soil, increasing organic matter and reducing CO 2 emissions to the atmosphere (Galdos et al, 2009(Galdos et al, , 2010Machado et al, 2010). In addition to increasing C stocks, the accumulation of soil organic matter can contribute to improving soil physical properties, biological activities, and nutrient availability.…”

Section: Introductionmentioning

confidence: 99%

Early Changes in Soil Metabolic Diversity and Bacterial Community Structure in Sugarcane under Two Harvest Management Systems

Azevedo

Morais

Lambais

2015

Rev. Bras. Ciênc. Solo

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Preharvest burning is widely used in brazil for sugarcane cropping. however, due to environmental restrictions, harvest without burning is becoming the predominant option. Consequently, changes in the microbial community are expected from crop residue accumulation on the soil surface, as well as alterations in soil metabolic diversity as of the first harvest. Because biological properties respond quickly and can be used to monitor environmental changes, we evaluated soil metabolic diversity and bacterial community structure after the first harvest under sugarcane management without burning compared to management with preharvest burning. soil samples were collected under three sugarcane varieties (sP813250, sP801842 and rb72454) and two harvest management systems (without and with preharvest burning). Microbial biomass C (MbC), carbon (C) substrate utilization profiles, bacterial community structure (based on profiles of 16S rRNA gene amplicons), and soil chemical properties were determined. MbC was not different among the treatments. C-substrate utilization and metabolic diversity were lower in soil without burning, except for the evenness index of C-substrate utilization. soil samples under the variety sP801842 showed the greatest changes in substrate utilization and metabolic diversity, but showed no differences in bacterial community structure, regardless of the harvest management system. in conclusion, combined analysis of soil chemical and microbiological data can detect early changes in microbial metabolic capacity and diversity, with lower values in management without burning. However, after the first harvest, there were no changes in the soil bacterial community structure detected by PCr-DggE under the sugarcane variety

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Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Cited by 19 publications

References 34 publications

Toposequences of soils developed on basaltic rocks: physicochemical attributes

Toposequences of soils developed on basaltic rocks: physicochemical attributes

Agregação de um Latossolo em função de diferentes ciclos de cultivo de cana-de-açúcar sob colheita mecanizada

Early Changes in Soil Metabolic Diversity and Bacterial Community Structure in Sugarcane under Two Harvest Management Systems

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