Legume cover crops under no-tillage favor organomineral association in microaggregates and soil C accumulation

Veloso, Murilo G.; Cecagno, Diego; Bayer, Cimélio

doi:10.1016/j.still.2019.03.003

Cited by 52 publications

(15 citation statements)

References 30 publications

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“…Esses sistemas são os com melhores práticas de manejo e de conservação do solo; consequentemente, adicionam maior quantidade de MOS. O PC e o SE foram enquadrados no mesmo grupo, o que revela os efeitos negativos das formas de manejo utilizadas, evidenciando também a transição de áreas com PC onde ocorre o revolvimento do solo em áreas que preconizam o não revolvimento (PD) (LI et al, 2019;NIJMEIJER et al, 2019;CECAGNO;BAYER, 2019).…”

Section: Resultsunclassified

“…A estrutura do solo é indicador-chave de sua qualidade, mas também serve como balizadora da sustentabilidade dos sistemas agrícolas de produção por apontar os efeitos dos sistemas agrícolas no solo dada sua relação com as demais propriedades edáficas CECAGNO;BAYER, 2019;MELO et al, 2019;SARKER et al, 2018). O entendimento do processo da formação estrutural do solo envolve a compreensão da interação dos aspectos biológicos, químicos, geológicos e físicos no contexto do ambiente edáfico.…”

Section: Introductionunclassified

“…O entendimento do processo da formação estrutural do solo envolve a compreensão da interação dos aspectos biológicos, químicos, geológicos e físicos no contexto do ambiente edáfico. A estabilidade dos agregados pode ser compreendida como um reflexo da estrutura do solo por ser dependente do equilíbrio integrado desses fatores CECAGNO;BAYER, 2019;MELO et al, 2019;OZÓRIO et al, 2019).…”

Section: Introductionunclassified

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Estoque de carbono e agregação do solo sob diferentes sistemas de uso no cerrado

Falcão

Monteiro

Ozório

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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O objetivo do trabalho foi avaliar o estoque de carbono e a agregação dosolo em diferentes sistemas de manejo no município de Aquidauana (MS).Foram coletadas amostras de solo na camada 0,0–0,1 m em seis áreas: soloexposto (SE), sistema de preparo convencional (PC), sistema plantio direto(PD), cana-de-açúcar (CA), pastagem permanente (PP) e mata nativa (MN).Das amostras, determinou-se: carbono orgânico total (COT), densidadedo solo (Ds), sendo calculados o estoque de carbono (EstC) e a variaçãono estoque de carbono (ΔEstC), além da análise de estabilidade de agregados.Obteve-se: diâmetro médio ponderado (DMP), diâmetro médio geométrico(DMG) e porcentagem de agregados retidos nas peneiras. Os resultados foramanalisados em delineamento inteiramente casualizado (DIC) e análise canônica.Os maiores valores de Ds foram observados nos sistemas SE 1,53 Mg m-3,PC 1,46 Mg m-3, PD 1,47 Mg m-3 e CA 1,46 Mg m-3. Os teores de COT das áreasde PP e PD foram superiores ao da MN. O EstC apresentou o mesmo padrãode COT. As áreas de PP e PD exibiram valores de DMP e DMG semelhante aMN. As áreas de PP, PD e MN tiveram mais de 60% dos seus agregados maioresque 2 mm. A análise canônica indicou a formação de três grupos, um com SEe PC, outro apenas com CA e o terceiro composto de PD, PP e MN. O SE e o PCcomprometem o estoque de carbono e a agregação do solo na camada 0–10cm, já a PP e o PD aumentaram o estoque de carbono nessa mesma camada.

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Section: Resultsunclassified

Section: Introductionunclassified

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Estoque de carbono e agregação do solo sob diferentes sistemas de uso no cerrado

Falcão

Monteiro

Ozório

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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“…The higher residues input and lower soil disturbance in NT increases the physical protection of C and N in aggregates and favors organo-mineral interaction, which ends up reducing the oxidative potential of the soil, increasing the stock of C and N compared to CT (Veloso et al, 2019). The higher residues input in NT observed for both summer and winter crops (Table 1) was possibly associated to the improvement in physical, chemical, and biological properties of soil.…”

Section: Discussionmentioning

confidence: 96%

Effect of 26-years of soil tillage systems and winter cover crops on C and N stocks in a Southern Brazilian Oxisol

Tiecher¹,

Gubiani²,

Santanna³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Soil management and crop rotation are key factors in controlling the accumulation of C and N in the soil profile, but their long-term effect remains poorly understood for deep soil layers, especially in subtropical conditions. Using a long-term experiment (26-years), this study aimed to evaluate the effect of different soil management systems associated with different winter cover crops on C and N accumulation in a very clayey (72 % clay) soil up to 1 m deep. Two tillage systems [conventional tillage (CT) and no-tillage (NT)] were cultivated with eight winter cover crops (black oat, rye, common vetch, hairy vetch, oilseed radish, wheat, blue lupine, and fallow) in a subtropical Oxisol from Southern Brazil. Soil samples were taken in eight soil layers up to 1.00 m soil depth after 26 years of experiment and, also from an adjacent native forest. After forest clearing, the C stock in the 0.00-0.20 m soil layer was reduced by 45 % in only 10 years (from 1976 to 1986) of soil tillage. Twenty-six years after the beginning of the experiment, C and N stock in 0.00-0.20 m soil layer were 13 and 20 % higher in NT compared to CT, with the greatest differences in C and N content observed in the 0.00-0.05 m layer. When associated with winter cover crops, NT accumulated 0.6 and 0.06 Mg ha-1 yr-1 more C and N than CT with winter fallow in the 0.00-0.20 m soil layer. No-tillage and CT recovered 95 and 83 %, respectively, of the C stock found in the 0.00-0.20 m layer from the native forest. However, in the 0.00-1.00 m soil layer, the positive effect of NT on soil C accumulation compared to CT was diluted, and no clear effect of NT was verified. Moreover, no difference in winter cover crops on soil C and N stocks were observed in all soil layers, possibly due to their similar residues input (3.3-4.9 Mg ha-1 yr-1). No-tillage associated with high biomass input through winter cover crops promoted a faster recovery of soil C and N stock than in CT and, therefore, is an efficient tool to improve soil C and N accumulation even in Oxisols with high clay content.

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“…It is known that reduced soil turning, together with the maintenance and supply of organic residue, increases the organic matter compartments and nutrient contents of the soil (Bayer et al, 2016;Veloso et al, 2019), progressively favoring its productive potential (Lenka et al, 2012;Bayer et al, 2016;Veloso et al, 2018Veloso et al, , 2019Maia et al, 2019). Few studies associate soil management practices with cashew cultivation in soils of the semi-arid region of the northeast (Ribeiro et al, 2007;Xavier et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Phytomass input and nutrient cycling under different management systems in dwarf cashew cultivation

Morais¹,

Filho

Saraiva

et al. 2020

Revista Brasileira De Ciência Do Solo

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Rational management of spontaneous plants is an alternative for increasing productivity in tree crops. This study aimed to evaluate the impact of management systems between rows and under the canopy of early dwarf cashew trees on the soil chemical properties and light-fraction organic matter and cashew root systems; we also evaluated the nutrient inputs from the spontaneous plants phytomass and cashew leaves deposited on an Arenic Kandiustults. The management systems under study were disc harrowing (DH) and mechanical mowing (MM) between rows, both with clearing under the cashew canopy (crowning), and herbicide (HERB) between the rows and under the canopy (without crowning). Soil and plant samples (leaves, stems, and roots) were collected at three points: under the canopy, at the canopy projected limit, and between the rows of cashew plants, all after seven years of conducting the experiment. Soil samples collected at the layers of 0.00-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m were evaluated for total organic carbon, light-fraction organic matter, and chemical attributes. Dry matter, Na, Ca, Mg, N, P, and K were determined in the spontaneous-plant phytomass from under the canopy, at the canopy projected limit, and between the rows. Results showed that between rows of cashew trees there are higher phytomass input and increases in the light fraction of organic matter, pH and Mg 2+ in the soil in the treatment MM. Not removing crop residues or spontaneous plants by crowning promoted accumulation of organic material and higher contents of nutrients under the canopy. The management of spontaneous plants and also soil surface under the canopy of the cashew plants had a great influence on productivity. The crowning, used in MM and DH, led to lower productivity, 1,171.87 and 594.97 kg ha-1 , respectively, when compared with the absence of crowning (HERB), which resulted in productivity of 1,363.80 kg ha-1. The practice of crowning is not recommended for soil management systems in dwarf cashew crops.

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Legume cover crops under no-tillage favor organomineral association in microaggregates and soil C accumulation

Cited by 52 publications

References 30 publications

Estoque de carbono e agregação do solo sob diferentes sistemas de uso no cerrado

Estoque de carbono e agregação do solo sob diferentes sistemas de uso no cerrado

Effect of 26-years of soil tillage systems and winter cover crops on C and N stocks in a Southern Brazilian Oxisol

Phytomass input and nutrient cycling under different management systems in dwarf cashew cultivation

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