Carbono e nitrogênio em agregados de Latossolo submetido a diferentes sistemas de uso e manejo

Jucksch, Ivo; Mendonça, Eduardo de Sá; Neves, Júlio César Lima

doi:10.1590/s0100-204x2006001000012

Cited by 31 publications

(30 citation statements)

References 22 publications

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“…Similar result for TN accumulation was described by Assis et al (2006) in aggregates of a Red Latosol (Oxisol) managed under NTS for 4 years, and under CTS for 30 years, with reduced TN contents in cultivated soils, compared to native forest soils (subcaducifolia forest).…”

Section: Total Nitrogen Contentssupporting

confidence: 85%

“…Evaluations of soil attributes after change from CTS to NTSH showed variations in total nitrogen (TN), and N contents in humic substances -fulvic acids (N-FA), humic acids (N-HA), and humin (N-HU fractions) -indicating changes in edaphic attributes and the impacts of the management system used on the soil quality (Assis et al, 2006;Guerra et al, 2008). These changes are mainly due to the N high dynamics and interactions with practically all processes occurring in the soil.…”

Section: Nitrogen and Humic Substances In Onion Under No-tillage And mentioning

confidence: 99%

“…However, more conservative systems that prioritize the contribution of organic residues and less soil turning, such as NTSH, have been efficient in maintaining the soil N contents, preserving its quality (Zibilske et al, 2002;Lovato et al, 2004;Assis et al, 2006). Therefore, the quantification of N contents in HS in soil aggregates assists in studies on their dynamics, since the sizes of the aggregates denote the SOM time, stability, and sensitivity to soil management practices.…”

Section: Nitrogen and Humic Substances In Onion Under No-tillage And mentioning

confidence: 99%

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Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Santos¹,

Loss²,

Lourenzi³

et al. 2018

Rev. Colomb. Cienc. Hortic.

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Total nitrogen and humic substances in aggregates of soils with onion crops under no-tillage and conventional tillage systems Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional ABSTRACTThe objective of this study was to evaluate the soil total nitrogen (TN), and N contents in humic substances (HS) of the organic matter in aggregates of soils cultivated with onion under no-till system for horticulture (NTSH) and conventional tillage system (CTS), comparing with an area of forest. The evaluated treatments were natural vegetation (control), 100% black oats, 100% rye, 100% oilseed radish, intercrop of oilseed (14%) + rye (86%), intercrop of oilseed (14%) + black oats (86%), area under CTS of onion for ±37 years, and area with secondary forest for ±30 years. Five years after the NTSH implementation, undisturbed soil samples from the layers 0-5 cm, 5-10 cm, and 10-20 cm were collected; these samples presented aggregate sizes between 2.0 mm and 8.00 mm. The TN, and N contents of the HS were subdivided into fulvic acids (N-FA), humic acids (N-HA), and humin (N-HU) fractions. The change from CTS to NTSH increases the TN and N-HU contents in the 0-5 cm soil layer. The intercrop of oats and oilseed radish, used as soil plant cover species in NTSH, presented a greater increase in N-HU (0-20 cm) than the other treatments. Black oats, and natural Onion (Allium cepa L.) crops cover an area of approximately 60,000 ha annually in Brazil, producing approximately 1.6 million t of onion bulbs (IBGE, 2017). The southern region of the country produces 49% of the national production, where the state of Santa Catarina (SC) stands out as the largest national producer since 1990, with a profitable production that has becoming more sustainable due to organic production studies (ACATE, 2014).Soil conventional tillage system (CTS) is the most used system for onion crops in SC, comprising frequent turning of the soil (plowing, harrowing, subsoiling or scarification) in the preparation of the soil of the planting bed (Menezes et al., 2013). This soil preparation increases the occurrence of erosive processes and changes edaphic attributes, decreasing nutrient availability to plants and soil organic matter content (Loss et al., 2015). CTS is an important system for food, fiber and energy production, however, it impacts the soil; thus, the search for soil management and conservation practices has been a constant challenge. No-till system for horticulture (NTSH) has stood out as a promising alternative for onion crops (Menezes et al., 2013). Soil turning in NTSH is done only in the planting line, and cover plants are used for the production and maintenance of plant residues on the soil. This practice maintains or increases the vegetation presented a greater increased in N-HA, and N-FA contents, respectively, in the 10-20 cm layer, than the other treatments in NTSH and CTS. CTS with millet as soil plant cover presented a greater increase in N-FA (0-20 cm) contents tha...

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Section: Total Nitrogen Contentssupporting

confidence: 85%

Section: Nitrogen and Humic Substances In Onion Under No-tillage And mentioning

confidence: 99%

Section: Nitrogen and Humic Substances In Onion Under No-tillage And mentioning

confidence: 99%

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Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Santos¹,

Loss²,

Lourenzi³

et al. 2018

Rev. Colomb. Cienc. Hortic.

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“…Esses mesmos autores trabalharam com Latossolos Vermelho-Amarelo e encontraram maiores conteúdos de C nos solos de textura argilosa do que nos de textura arenosa. Desta forma, solos mais argilosos apresentam uma maior capacidade de retenção de ácidos fúlvicos (Assis et al, 2006).…”

Section: Resultsunclassified

“…A mineralogia mais oxídica pode ter atuado como fonte de Al e Fe, complexando e retendo o húmus na forma de humina. Esse processo confere certa estabilidade na MOS (Pirakornphanich et al, 1988;Mendonça e Rowell, 1996;Assis et al, 2006).…”

Section: Propriedades Corg C-faf C-fah C-hum C-fah/ C-faf C-ea/ C-humunclassified

Substâncias húmicas e relação com atributos edáficos

et al. 2011

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ResumoEste trabalho teve como objetivo caracterizar a distribuição das substâncias húmicas (ácidos fúlvicos livres, ácidos húmicos, ácidos fúlvicos e humina) e atributos edáficos em perfis de solos de diferentes regiões do Brasil, que foram objeto de estudos de reuniões de correlação e levantamentos de solos realizados pela Embrapa e outras instituições. As amostras foram selecionadas e fracionadas seguindo conceitos da IHSS. A fração humina apresentou os maiores valores de C em todos os perfis, seguida pelos ácidos fúlvicos livres. Nos perfis em ambientes com altitudes elevadas o clima (Cwa, Cfb, Cwb) favoreceu a formação dos ácidos fúlvicos livres. Quanto às propriedades químicas, em ambos os horizontes foram verificados coeficientes de correlação positiva entre o hidrogênio e o conteúdo de carbono orgânico, r=0,58* e r=0,83**, para os horizontes A e B, respectivamente. Dentre as substâncias húmicas a de melhor correlação com o conteúdo de carbono orgânico foi a fração humina, com r=0,89** e r=0,91** para os horizontes A e B, respectivamente. Foi observada correlação positiva (p<0,05) entre a areia grossa e os C-FAF, C-FAH, C-HUM e a relação C-EA:C-HUM, nos horizontes A, indicando que a textura mais arenosa de alguns horizontes superficiais favorece a formação destas substâncias húmicas. O teor de C nos horizontes superficiais e subsuperficiais e a distribuição das substâncias húmicas variaram com a pedogênese e a altitude.Palavras-chave: Matéria orgânica do solo, granulometria, classificação de solos. Humic substances and relationship to soil attributes AbstractThis study had as objective to characterize the distribution of humic substances (free fulvic acids, humic acids, fulvic acids, and humin) in soil profiles from different regions of Brazil, that had been object of studies of correlation meetings and soils surveys carried through by Embrapa and other institutions. The soil samples were selected and fractionated following concepts recognized by the IHSSS. The humin fraction presented the highest values of C in all the profiles, followed by the free fulvic acid fraction. In the profiles located on high altitude the climate (Cwa, Cfb, Cwb) favored the formation of free fulvic acid. As for the chemical properties, both horizons showed positive correlation coefficients between hydrogen and organic carbon content, with r=0.58* and r=0.83** for A and B horizons, respectively. Amongst the humic substances the humin showed the best correlation with the organic carbon content, with r=0.89** and r=0.91**) for A and B horizons, respectively. A positive correlation was observed between the coarse sand fraction and the C-FAF, C-HAF, C-HUM and the relation C-EA:C-HUM in the A horizons, indicating that the coarse texture of some surface horizons favors the formation of these humic substances. The organic C content in the surface and subsurface horizons and the distribution of humic substances varied with pedogenesis and altitude conditions.

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For how long does the quality and quantity of residues in the soil affect the carbon compartments and CO2-C emissions?

et al. 2016

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Purpose The mineralization/immobilization of nutrients from the crop residues is correlated with the quality of the plant material and carbon compartments in the recalcitrant and labile soil fractions. The objective of this study was to correlate the quality and quantity of crop residues incubated in the soil with carbon compartments and CO 2 -C emission, using multivariate analysis. Materials and methods The experiment was conducted in factorial 4 + 2 + 5 with three replicates, referring to three types of residues (control, sugarcane, Brachiaria, and soybean), and two contributions of the crop residues in constant rate, CR (10 Mg ha −1 residue), and agronomic rate, AR (20, 8, and 5 Mg ha −1 residue, respectively, for sugarcane, soybean, and Brachiaria), evaluated five times (1, 3, 6, 12, and 48 days after incubation). At each time, we determined the CO 2 -C emission, nitrogen and organic carbon in the soil, and the residues. In addition, the microbial biomass and water-soluble, labile, and humic substance carbons fractionated into fulvic acids, humic acids and humin were quantified.Results and discussion Higher CO 2 -C emissions occurred in the soil with added residue ranging from 0.5 to 1.1 g CO 2 -C m −2 h −1 in the first 6 days of incubation, and there was a positive correlation with the less labile organic soil fractions as well as residue type. In the final period, after 12 days of soil incubation, there was a higher relation of CO 2 -C emission with carbon humin. The sugarcane and soybean residue (20 Mg ha −1 ) promoted higher CO 2 -C emission and the reduction of carbon residue. The addition of residue contributed to an 82.32 % increase in the emission of CO 2 -C, being more significant in the residue with higher nitrogen availability. Conclusions This study shows that the quality and quantity of residue added to soil affects the carbon sequestration and CO 2 -C emission. In the first 6 days of incubation, there was a higher CO 2 -C emission ratio which correlates with the less stable soil carbon compartments as well as residue. In the final period of incubation, there is no effect of quality and quantity of residue added to soil on the CO 2 -C emission.

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Carbono e nitrogênio em agregados de Latossolo submetido a diferentes sistemas de uso e manejo

Cited by 31 publications

References 22 publications

Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Nitrógeno total y sustancias húmicas en agregados del suelo cultivado con cebolla bajo siembra directa y preparación convencional

Substâncias húmicas e relação com atributos edáficos

For how long does the quality and quantity of residues in the soil affect the carbon compartments and CO2-C emissions?

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