Carbono e frações granulométricas da matéria orgânica do solo sob sistemas de produção orgânica

Loss, Arcângelo; Pereira, Marcos Gervásio; Schultz, Nivaldo; Anjos, Lúcia Helena Cunha dos; Silva, Eliane Maria Ribeiro da

doi:10.1590/s0103-84782009005000036

Cited by 35 publications

(31 citation statements)

References 6 publications

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“…It was also noted that POM was efficient to indicate differences between the rotation systems studied in crop-livestock integration, mainly in the 0.0 0.05 m layer. Similar reports, of higher POM levels in the 0.0 0.05 m layer, making the differentiation of management systems possible according to the deposition of organic material on the soil, were published by Nicoloso et al (2008) and Loss et al (2009). No changes in POM caused by crop rotation systems in crop-livestock integration were observed in the 0.15 0.20 m layer (Table 4).…”

Section: Resultssupporting

confidence: 77%

“…The reason was that the integrated crop-livestock management under study was a no-tillage system, in which crop residues are left on the soil surface. Loss et al (2009) The differences between mineral-associated organic matter (MOM) were only statistically significant between the systems (Table 5). The average contents of this decay-resistant organic matter were statistically the same in almost all treatments, except in S5, where the MOM concentrations were lower than in NF and the S3 system.…”

Section: Resultsmentioning

confidence: 97%

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Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Tirloni¹,

Vitorino

Bergamin

et al. 2012

Rev. Bras. Ciênc. Solo

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SUMMARYCrop-livestock integration represents an interesting alternative of soil management, especially in regions where the maintenance of cover crops in notillage systems is difficult. The objective of this study was to evaluate soil physical and chemical properties, based on the hypothesis that a well-managed croplivestock integration system improves the soil quality and stabilizes the system. The experiment was set up in a completely randomized design, with five replications. The treatments were arranged in a 6 x 4 factorial design, to assess five crop rotation systems in crop-livestock integration, and native forest as reference of soil undisturbed by agriculture, in four layers (0.0-0.05; 0.05-0.10; 0.10-0.15 and 0.15-0.20 m). The crop rotation systems in crop-livestock integration promoted changes in soil physical and chemical properties and the effects of the different systems were mainly detected in the surface layer. The crops in integrated croplivestock systems allowed the maintenance of soil carbon at levels equal to those of the native forest, proving the efficiency of these systems in terms of soil conservation. The systems influenced the environmental stability positively; the soil quality indicator mineral-associated organic matter was best related to aggregate stability.Index terms: crop rotation, no-tillage system, soil quality, soil carbon, aggregate stability.( (0,0-0,05, 0,05-0,10, 0,10-0,15 e 0,15-0,20 m

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 97%

Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Tirloni¹,

Vitorino

Bergamin

et al. 2012

Rev. Bras. Ciênc. Solo

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“…Na área de figo, os maiores teores de COT são devidos ao uso de cobertura morta proveniente do corte da grama batatais (Paspalum notatum) que estava cobrindo o solo na estação do verão. Esta prática auxilia na manutenção da umidade do solo e evita o contato direto dos raios solares com o solo, diminuindo a temperatura na camada superficial do solo e, consequentemente, a mineralização da MOS (Loss et al, 2009b Em relação à estação do inverno, no sistema de uso do solo com berinjela/milho observou-se o maior teor de COT (9,8 g kg -1 ) para a profundidade de 0-5 cm. Já na profundidade de 5-10 cm, os sistemas de uso do solo com milho/feijão e berinjela/milho os maiores teores de COT foram de 10,3 e 9,3 g kg -1 respectivamente (Tabela 1).…”

Section: Resultsunclassified

“…Estes resultados são decorrentes da ausência de cobertura morta, na estação do inverno, na área com figo, e da adoção do sistema plantio direto na área sob berinjela/ milho; no momento da coleta de solo, a cultura do milho já havia sido colhida, deixando os resíduos culturais em superfície para novo plantio de berinjela sobre a palhada do milho (0-5 cm). Na área de milho/feijão, o maior teor de COT está relacionado com o revolvimento do solo (aração e gradagem) (Loss et al, 2009b). Na profundidade de 5-10 cm foram constatadas maiores variações nos teores de COT entre os diferentes sistemas de uso do solo analisados para a estação do verão.…”

Section: Resultsunclassified

“…Na profundidade de 5-10 cm foram constatadas maiores variações nos teores de COT entre os diferentes sistemas de uso do solo analisados para a estação do verão. Este padrão difere do observado na profundidade de 0-5 cm, onde a adubação orgânica utilizada nas áreas homogeneizou os teores de COT na camada superficial (Loss et al, 2009b), como notado nas áreas de milho/ feijão (9,5 e 9,1 g kg -1 , respectivamente, verão e inverno), maracujá (9,1 e 8,8 g kg -1 , respectivamente, verão e inverno) e SAF (9,4 e 9,0 g kg -1 , respectivamente, verão e inverno). Os teores de COT foram estatisticamente iguais nas duas estações, não sendo verificadas diferenças estatísticas entre as estações (não significativo pelo teste F) (Tabela 1).…”

Section: Resultsunclassified

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Quantificação do carbono das substâncias húmicas em diferentes sistemas de uso do solo e épocas de avaliação

et al. 2010

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RESUMOA quantificação do carbono nas diferentes frações da matéria orgânica do solo (MOS) torna-se necessária devido ao interesse de se conhecer o potencial de captura e armazenamento do carbono nos diferentes sistemas de uso do solo. O objetivo deste trabalho foi quantificar o carbono das substâncias húmicas em diferentes sistemas de uso do solo e épocas de avaliação e correlacioná-lo com algumas propriedades químicas e físicas do solo. Os sistemas selecionados foram: preparo convencional (PC-milho/feijão), plantio direto (PD-berinjela/milho), consórcio maracujá/Desmodium sp, cultivo com figo e sistema agroflorestal. As amostras de solo foram coletadas em duas profundidades (0-5 e 5-10 cm) e épocas (17/11/2005-verão e 23/6/2006-inverno). Foi determinado o carbono orgânico total (COT) e realizado o fracionamento químico da MOS, quantificando-se o carbono da fração humina (C-HUM), fração ácido húmico (C-FAH) e fração ácido fúlvico (C-FAF). O C-HUM constituiu a maior parte do COT, havendo correlação significativa com o COT em todos os sistemas avaliados e estações. Analisando o C-FAH foi possível identificar alterações no solo relacionadas aos sistemas de uso, na profundidade de 0-5 cm e no verão, destacando-se o PD com os maiores teores. Com o C-FAF ocorreu este mesmo comportamento, mas na profundidade de 5-10 cm e no inverno, destacando-se o PC com maiores valores. Foram verificadas correlações significativas entre Valor S, Valor T e DMP em todos os sistemas, com exceção da área de PC. O PD aumenta os teores de C-FAH, nas duas profundidades e nas duas estações, quando comparado ao PC do solo.Palavras-chave: agricultura orgânica, resíduos vegetais, humina, ácidos húmicos e fúlvicos. ABSTRACT CARBON QUANTIFICATION OF HUMIC SUBSTANCES IN DIFFERENT SOIL USE SYSTEMS AND EVALUATION PERIODSThe quantification of carbon in different fractions of soil organic matter (SOM) is necessary because of the interest in understanding the potential to capture and store carbon in various soil use systems. The objective of this study was to quantify the carbon of humic substances in different soil use systems and evaluation seasons and correlate it with some chemical and physical properties of a 6%-clayey soil. The systems selected were: conventional tillage (CT-maize/common beans), no tillage (NT-eggplant/maize), passion fruit/Desmodium sp consortium, fig grove, and agroforest system. Soil samples were taken at two depths (0-5 and 5-10 cm) in two seasons of the year (17/11/2005 -summer and 23/06/2006 -winter). The total organic carbon (TOC) was determinated by wet combustion and SOM chemical fractioning was conducted following IHSS method, with determination of organic carbon in humin fraction (C-HUM), humic acid fraction (C-HAF) and fulvic acid fraction (C-FAF). Most of TOC consisted of C-HUM showing significant correlation with TOC in all evaluated systems and seasons. Values of C-FAH showed soil changes due to the use systems at 0-5cm depth in summer, particularly NT which showed the highest C-FAH values. The C-FAF showed similar...

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Soil microbial carbon and activity along with land use and geographic gradients

Bröring

Goss‐Souza

Baretta

et al. 2023

Soil Science Soc of Amer J

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Changes in microbial biomass carbon (MBC) and microbial respiration in soils under five different land‐use systems were evaluated at a regional scale in Santa Catarina State, Southern Brazil, to assess the effects of land‐use change and geographical distribution on the microbial and environmental patterns related to soil carbon (C) dynamics. Results showed that, in the West mesoregion, changes in MBC were correlated to the sampling season in forest and pasture systems. In the Plateau mesoregion, however, a land‐use effect was observed, with MBC decreasing in no‐till and crop‐livestock integration systems. Forest and grassland sites presented the highest values of MBC and microbial activity, while grassland sites showed lower values of the metabolic quotient (qCO2) and higher values of the microbial quotient. The qCO2 was also lower in winter for all land‐use systems. The highest total and particulate organic carbon values were found in forest sites. Chemical–physical characteristics were also observed to be significantly correlated with microbiological variables related to soil microbial C dynamics. In conclusion, land‐use intensity, season, and location were found to be the main drivers of changes in microbial C dynamics.

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Carbono e frações granulométricas da matéria orgânica do solo sob sistemas de produção orgânica

Cited by 35 publications

References 6 publications

Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Quantificação do carbono das substâncias húmicas em diferentes sistemas de uso do solo e épocas de avaliação

Soil microbial carbon and activity along with land use and geographic gradients

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