Soil microbial activity and crop sustainability in a long-term experiment with three soil-tillage and two crop-rotation systems

Hungría, Mariangela; Franchini, J. C.; Brandão-Junior, Osvaldino; Kaschuk, Glaciela; Souza, Rosinei Aparecida

doi:10.1016/j.apsoil.2009.05.005

Cited by 190 publications

(129 citation statements)

References 47 publications

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“…O tempo de reciclagem da biomassa microbiana é da ordem de 0,2 a 0,6 anos, proporcionando dessa forma um fluxo de C e nutrientes no solo, esta taxa de reciclagem é em média 200 vezes mais rápida comparada a biomassa vegetal, evidenciando a importância dos processos microbianos do solo no fluxo de C (energia) e dos elementos absorvidos pelas plantas e animais nos ecossistemas (MOREIRA; SIQUEIRA, 2006). Em solos tropicais a ciclagem de nutrientes e da biomassa microbiana ocorre mais rapidamente do que em regiões temperadas (HUNGRIA et al, 2009). …”

Section: Biomassa Microbiana E Parâmetros Microbiológicos Do Solounclassified

“…Por ser reservatório lábil de nutrientes que se recicla rapidamente e por representar uma pequena parte do C e N do solo e atuar diretamente no ciclo destes elementos, a biomassa microbiana do solo é considerado bom indicador prévio de mudanças na matéria orgânica total do solo, respondendo às mudanças nos padrões de entrada e taxas de decomposição da MOS antes que alterações no C e N total sejam detectadas (POWLSON et al, 1987a;BALOTA et al, 1998;HUNGRIA et al, 2009).…”

Section: Biomassa Microbiana E Parâmetros Microbiológicos Do Solounclassified

“…A análise do carbono microbiano se tornou um método padrão para caracterização do solo (WU et al, 1990), pois, o carbono imobilizado na biomassa microbiana é um parâmetro que responde prontamente às alterações ambientais (FRANCHINI et al, 2007;HUNGRIA et al, 2009). O nitrogênio da biomassa microbiana, embora represente pequena fração da biomassa microbiana (1 a 5%) é associada a reserva lábil e a ciclagem desse nutriente, assim como, a decomposição do material orgânico e o fluxo de energia .…”

Section: Biomassa Microbiana E Parâmetros Microbiológicos Do Solounclassified

“…Esta relação indica o potencial de mineralização do N e, de maneira genérica, refletem as alterações que ocorrem na composição microbiana, quando tal relação apresenta valores acima de 10 e, isto indica a predominância de fungo, e abaixo de 10 indica a predominância de bactérias (LI; ALLEN, H. L; WOLLUM, 2004). A biomassa microbiana, a taxa de mineralização do N, e a atividade microbiana sofrem influência das características e dos compostos do solo (relação C:N, C e N dissolvido), da temperatura e umidade do solo (HERAI et al, 2006) e dos diferentes usos do solo (GOVAERTS et al, 2007;HUNGRIA et al, 2009).…”

Section: Biomassa Microbiana E Parâmetros Microbiológicos Do Solounclassified

“…Os teores obtidos estão de acordo com os valores encontrados em outros trabalhos para diferentes culturas e condições climáticas (BALOTA et al, 1998;HAYNES, 2006;HUNGRIA et al, 2009;SILVA et al, 2010;SANTOS, et al, 2012b (BALOTA et al, 1998). Embora seja esperado que a biomassa microbiana seja maior em solo argiloso pela maior retenção da matéria orgânica do solo (SUGIHARA et al, 2010), nossos resultados mostraram que o solo arenoso respondeu mais expressivamente à alteração de manejo da palha.…”

Section: Efeito Da Remoção Da Palha Na Biomassa Microbiana Do Solounclassified

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Efeito da remoção de quantidades de palha de cana-de-açúcar na biomassa e na comunidade microbiana do solo

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Section: Biomassa Microbiana E Parâmetros Microbiológicos Do Solounclassified

Section: Efeito Da Remoção Da Palha Na Biomassa Microbiana Do Solounclassified

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Efeito da remoção de quantidades de palha de cana-de-açúcar na biomassa e na comunidade microbiana do solo

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Deficit irrigation for sugarbeet under conventional and no‐till production

Nilahyane

Chen

Afshar

et al. 2020

Agrosystems Geosci & Env

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Irrigation is important to sugarbeet (Beta vulgaris L.) production and efficient irrigation management is critical for yield, sugar concentration, water use, and environment quality. Two irrigation studies were conducted to investigate sugarbeet response to deficit irrigation under conventional tillage (CT) and no-till (NT) systems in 2016 and 2018. The irrigation treatments included full irrigation (100% crop evapotranspiration, 100ETc) and deficit irrigation (66% crop evapotranspiration, 66ETc), and two irrigation cutoff dates (15 and 30 d before harvest). Plant population, soil moisture, sugarbeet root yield, sucrose concentration, and impurity value were measured. Although deficit irrigation at 66ETc did not affect the sugarbeet root yield, sucrose concentration, and sugar yield in 2016, it reduced the root yield, sugar yield, and extractable sugar yield by 5.5, 1.2, and 1.2 Mg ha −1 under CT and 12.4, 2.1, and 1.9 Mg ha −1 under NT systems in 2018. Soil moisture in NT showed great depletion at 15-and 38-cm depths in July and August in 2018. Results indicate the potential of implementing a deficit irrigation strategy in sugarbeet to reduce the water supply and increase the water use efficiency, but in-situ soil moisture sensors should be installed to monitor soil moisture to avoid severe water stress. Stopping irrigation 30 d before harvest slightly reduced the sugarbeet root yield but did not affect extractable sugar yield, suggesting that omitting one irrigation late in the growing season may not reduce root yield and quality. Deficit irrigation in conjunction with a no-till system could reduce production costs and bring environmental benefits.

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Root growth and crop performance of soybean under chemical, physical, and biological changes after subsoiling

et al. 2020

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Chemical, physical and biological soil attributes can facilitate soybean root growth in greater volume and depth in the soil, which can minimize yield reduction caused by water deficit. Soil management can contribute positively or negatively to these soil attributes. The aim of this work was to evaluate the root growth and crop performance of soybean, in response to chemical, physical and biological changes after subsoiling at different depths. At the R5 phenological stage, trenches were made for sampling and soil collection for chemical, physical and biological analysis and root growth was carried out. At V5, V7, R2 and R5 stages, plants were collected to evaluate height, leaf area and dry mass. At V5, stage number and dry mass of the nodules were evaluated. Subsoiling increased pH and Ca, and decreased Al in the soil, resulted in higher relative density and did not affect in mechanical penetration resistance compared to non-subsoiled soil. Basal respiration and soybean nodulation were higher in the subsoiled soil. Up to 15 cm depth, there were 87.91% of the total root dry mass and 78.79% of the total root volume. Initial and final plant growth were the same in subsoiled and non-subsoiled soil. Number of nodules in the subsoiled soil was 28% higher than in the non-subsoiled soil. Under these study conditions, subsoiling provides lower root growth but benefits grain yield.

show abstract

Soil microbial activity and crop sustainability in a long-term experiment with three soil-tillage and two crop-rotation systems

Cited by 190 publications

References 47 publications

Efeito da remoção de quantidades de palha de cana-de-açúcar na biomassa e na comunidade microbiana do solo

Efeito da remoção de quantidades de palha de cana-de-açúcar na biomassa e na comunidade microbiana do solo

Deficit irrigation for sugarbeet under conventional and no‐till production

Root growth and crop performance of soybean under chemical, physical, and biological changes after subsoiling

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