Adubação nitrogenada na aveia preta. II - Influência na decomposição de resíduos, liberação de nitrogênio e rendimento de milho sob sistema plantio direto

Amado, Telmo Jorge Carneiro; Santi, Anderson; Acosta, J. A. A.

doi:10.1590/s0100-06832003000600013

Cited by 21 publications

(16 citation statements)

References 17 publications

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“…These crop residues were chopped in 0.05 m pieces and dried at 65 o C to constant weight. The mesh-bags (0.10 x 0.20 m) were made of a 50 μm screen to allow access of soil mesoand macro-fauna (Amado et al, 2003;Padovan et al, 2006). In the first evaluation period (1998/1999), the mesh-bags were filled with an equal amount of crop residues for all treatments.…”

Section: Crop Residue Decompositionmentioning

confidence: 99%

“…Residue decomposition is mainly regulated by climatic conditions, soil nutrient availability and the biochemical composition of the residues, such as lignin and alkaloid contents and C/N ratio (Rees et al, 2005;Padovan et al, 2006). In field studies of crop residue decomposition under soil tillage systems, mesh-bags are frequently applied (Wieder & Land, 1982;Amado et al, 2003;Padovan et al, 2006;De Bona et al, 2006). Soil C-CO 2 emission is a sensitive indicator of changes in microbial biomass induced by soil management systems, and, therefore, it is important to understand the crop residue and SOM dynamics (Campbell et al, 1991;Franzluebbers et al, 1995;Vargas & Scholles, 2000;Costa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…on the other hand, no tillage maintains crop residues on the soil surface, promotes minimum soil disturbance limiting the soilresidue contact resulting in a reduced crop residue decomposition rate (Amado et al, 2003). The C-CO 2 emissions are regulated by C crop residue input (Franzlubbers et al, 1995;Mielnick, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Long-term C-CO2 emissions and carbon crop residue mineralization in an oxisol under different tillage and crop rotation systems

Campos

Amado

Tornquist

et al. 2011

Rev. Bras. Ciênc. Solo

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Soil C-CO 2 emissions are sensitive indicators of management system impacts on soil organic matter (SOM). The main soil C-CO 2 sources at the soil-plant interface are the decomposition of crop residues, SOM turnover, and respiration of roots and soil biota. The objectives of this study were to evaluate the impacts of tillage and cropping systems on long-term soil C-CO 2 emissions and their relationship with carbon (C) mineralization of crop residues. A long-term experiment was conducted in a Red Oxisol in Cruz Alta, RS, Brazil, with subtropical climate Cfa (Köppen classification), mean annual precipitation of 1,774 mm and mean annual temperature of 19.2 o C. Treatments consisted of two tillage systems: (a) conventional tillage (CT) and (b) no tillage (NT) in combination with three cropping systems: (a) R0-monoculture system (soybean/wheat), (b) R1-winter crop rotation (soybean/wheat/soybean/black oat), and (c) R2-intensive crop rotation (soybean/ black oat/soybean/black oat + common vetch/maize/oilseed radish/wheat). The soil C-CO 2 efflux was measured every 14 days for two years (48 measurements), by trapping the CO 2 in an alkaline solution. The soil gravimetric moisture in the 0-0.05 m layer was determined concomitantly with the C-CO 2 efflux measurements. The crop residue C mineralization was evaluated with the mesh-bag method, with sampling 14, 28, 56, 84, 112, and 140 days after the beginning of the evaluation period for C measurements. Four C conservation indexes were used to assess the relation between C-CO 2 efflux and soil C stock and its compartments. The crop Brazil. residue C mineralization fit an exponential model in time. For black oat, wheat and maize residues, C mineralization was higher in CT than NT, while for soybean it was similar. Soil moisture was higher in NT than CT, mainly in the second year of evaluation. There was no difference in tillage systems for annual average C-CO 2 emissions, but in some individual evaluations, differences between tillage systems were noticed for C-CO 2 evolution. Soil C-CO 2 effluxes followed a bi-modal pattern, with peaks in October/November and February/March. The highest emission was recorded in the summer and the lowest in the winter. The C-CO 2 effluxes were weakly correlated to air temperature and not correlated to soil moisture. Based on the soil C conservation indexes investigated, NT associated to intensive crop rotation was more C conserving than CT with monoculture.Index terms: management systems, no tillage, conventional tillage, greenhouse gases. RESUMO: EMISSÕES DE C-CO 2 DE LONGO PRAZO E A MINERALIZAÇÃO DO CARBONO DOS RESÍDUOS CULTURAIS EM UM LATOSSOLO SOB DIFERENTES SISTEMAS DE PREPARO E ROTAÇÃO DE CULTURAS A emissão de C-CO 2 do solo é considerada um indicador sensível dos impactos de sistemas de manejo sobre a matéria orgânica do solo (MOS). Nos sistemas agrícolas, as principais fontes de C-CO 2 são as decomposições dos resíduos culturais e da MOS, além da respiração das raízes das culturas e da biota do solo. O principal objetivo de...

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Section: Crop Residue Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-term C-CO2 emissions and carbon crop residue mineralization in an oxisol under different tillage and crop rotation systems

Campos

Amado

Tornquist

et al. 2011

Rev. Bras. Ciênc. Solo

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“…O cultivo de leguminosas tem demonstrado ser uma alternativa promissora na suplementação de N para as culturas em sucessão (Amado et al, 2003;Sisti et al, 2004), devido à capacidade de fixação do N 2 atmosférico e à estreita relação carbono:nitrogênio (C:N) de seus resíduos, o que leva a uma rápida decomposição , disponibilizando ao solo, aos microrganismos e às plantas em sucessão, além do N e do C acumulados (Mulvaney et al, 2010), todos os nutrientes contidos na biomassa. Por outro lado, os resíduos deixados pelas gramíneas, por apresentarem elevados valores de relação C:N, decompõem-se mais lentamente e permanecem mais tempo sobre o solo, reduzindo a erosão, o que é desejável, sobretudo nas regiões de clima tropical, o qual favorece a rápida decomposição dos resíduos das culturas (Pires et al, 2008;Carvalho et al, 2009;Pacheco et al, 2011).…”

Section: Introductionunclassified

Sequências de culturas em sistema de semeadura direta: II - decomposição e liberação de nutrientes na entressafra

Marcelo¹,

Corá

Fernandes

2012

Rev. Bras. Ciênc. Solo

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“…A presença de resíduos vegetais com alta relação C/N, normalmente superior a 30:1, tem sido uma das principais causas do menor produtividade das culturas em sucessão (AITA et al, 2001;ROSOLEM;PACE;CRUSCIOL, 2004;COSTA et al, 2011b), principalmente em decorrência da imobilização, ao menos temporária, do N no solo. A relação C/N das culturas de cobertura influi na taxa de mineralização dos resíduos e, consequentemente, na liberação de N ao sistema (NICOLARDOT; RECOUS; MARY, 2001), sendo a mineralização inversamente proporcional ao teor de lignina e à relação C/N dos resíduos, ou seja, quanto maior a relação C/N, mais lenta será a mineralização dos resíduos (AMADO; SANTI; ACOSTA, 2003). Assim, no planejamento das espécies a serem utilizadas no sistema de culturas, deve-se dar preferência a espécies leguminosas, quando se pretende implantar a cultura do milho no verão.…”

Section: Fonte De Variaçãounclassified

Estoque de carbono orgânico no solo afetado por adubação orgânica e sistemas de culturas no Sul do Brasil

et al. 2012

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Organic carbon is a major component of soil organic matter and its stock is influenced by the management system adopted. This study aimed to examine the effects of cropping systems and nutrient sources (mineral and organic) on the concentrations and storage of soil organic carbon in no-tillage system. The experiment was carried out in Mercedes, Parana, Brazil, in an Nitossolo Vermelho (Alfisol) from October 2007 to September 2009. The treatments consisted of four crop succession systems: (1) soybean/wheat/corn/wheat; (2) soybean/black oat/ corn/black oat, (3) soybean/radish/corn/radish and (4) soybean/common vetch/corn/common vetch and by two sources of nutrients (mineral and organic), arranged in a to split plot randomized block design with four replications. Soil samples were collected in layers of 0.0-0.05, 0.05-0.10, 0.10-0.20 and 0.20 to 0.40 m deep in the first and the second years of cultivation. Different cropping systems does not affect the content and the stock of soil organic carbon

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Adubação nitrogenada na aveia preta. II - Influência na decomposição de resíduos, liberação de nitrogênio e rendimento de milho sob sistema plantio direto

Abstract: RESUMO

Cited by 21 publications

References 17 publications

Long-term C-CO2 emissions and carbon crop residue mineralization in an oxisol under different tillage and crop rotation systems

Long-term C-CO2 emissions and carbon crop residue mineralization in an oxisol under different tillage and crop rotation systems

Sequências de culturas em sistema de semeadura direta: II - decomposição e liberação de nutrientes na entressafra

Estoque de carbono orgânico no solo afetado por adubação orgânica e sistemas de culturas no Sul do Brasil

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