Soja em sucessão a adubos verdes no sistema de plantio direto e convencional em solo de Cerrado

Carvalho, Marco Antônio Camillo de; Athayde, Manoel Luiz Ferreira; Soratto, Rogério Peres; Alves, Marlene Cristina; Arf, Orivaldo

doi:10.1590/s0100-204x2004001100013

Cited by 28 publications

(26 citation statements)

References 16 publications

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“…This confirms results of Cortez et al (2009), who observed increases in corn and soybean yields over the years with the use of no-tillage systems. Carvalho et al (2004), on the other hand, reported greater soybean yields in a year with normal precipitation in the conventional soil preparation system.…”

Section: Resultsmentioning

confidence: 95%

Characterization of soil structure and porosity under long-term conventional tillage and no-tillage systems

Filho

Tessier

2009

Rev. Bras. Ciênc. Solo

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Different management systems tend to modify soil structure and porosity over the years. The aim of this study was to study modifications in the morphostructure and porosity of dystroferric Red Latosol (Oxisol) under conventional tillage and no-tillage over a 31-year period. The study began with the description of soil profiles based on the cropping profile method, to identify the most compact structures, define sample collection points for physical and chemical analysis, and determine the water retention curve. A forest soil profile was described and used as reference. The results showed that, under conventional tillage, the microaggregate structure of the Oxisol was fragmented between 0 and 0.20 m, and compact (bulk density = 1.52 Mg m -3 ) in the sub-surface layer between 0.20 and 0.50 m. Under no-tillage, the structure became compacted (bulk density = 1.40 Mg m -3 ) between 0 and 0.60 m, but contained fissures and biopores. The volume of the class with a pore diameter of ≥ ≥ ≥ ≥ ≥ 100 μ μ μ μ μm under no-tillage was limited, but practically non-existent in the conventional management system. On the other hand, the classes with a pore diameter of < 100 μ μ μ μ μm were not affected by the type of soil management system. Index terms: Latosol/Oxisol, soil management, cropping profile method, water retention curve.(

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Section: Resultsmentioning

confidence: 95%

Characterization of soil structure and porosity under long-term conventional tillage and no-tillage systems

Filho

Tessier

2009

Rev. Bras. Ciênc. Solo

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“…Em SPC, o preparo do solo realizado com antecedência de pelo menos 45 dias antes da semeadura das culturas anuais desfavorece o acúmulo de FS com o reinício das chuvas e aumenta a suscetibilidade do solo à erosão hídrica. Segundo Carvalho et al (2004), o uso do solo sob SPC pode causar, além da compactação, a redução da estabilidade dos agregados, aumentando a propensão à perda de solo.…”

Section: Resultsunclassified

Produção de fitomassa e acúmulo de nutrientes por plantas de cobertura no cerrado piauiense

Pacheco

Monteiro

Silva³

et al. 2013

Bragantia

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ResumoO objetivo deste trabalho foi avaliar o potencial de plantas de cobertura semeadas em diferentes sistemas de cultivo quanto à produção de fitomassa e acúmulo de nutrientes, no cerrado piauiense. O experimento foi instalado no ano agrícola 2010/2011, na Serra do Quilombo, município de Bom Jesus (Piauí). O arranjo utilizado foi em parcelas subdivididas, com os seguintes sistemas de manejo do solo: preparo convencional e plantio direto avaliados nas parcelas e, nas subparcelas, os sistemas de produção: S 1 -Soja no verão em monocultura; S 2 -Soja no verão e Penissetum glaucum na safrinha; S 3 -P. glaucum pré-soja de verão e sobressemeadura de Urochloa ruziziensis na soja no estádio R 5.5 ; S 4 -Soja de verão e sobressemeadura de P. glaucum na soja no estádio R 5.5 ; S 5 -Milho verão + U. ruziziensis simultâneo. Utilizou-se o delineamento em blocos casualizados, com quatro repetições. Os sistemas com a sobressemeadura do P. glaucum e do U. ruziziensis na soja e o consórcio de milho + U. ruziziensis destacaram-se na produção de fitomassa seca, cobertura do solo e acúmulo de nutrientes durante a entressafra no cerrado piauiense. Os nutrientes com maior taxa de acúmulo pelas plantas de cobertura foram o nitrogênio e o potássio.Palavras-chave: Braquiária, milheto, decomposição, crotalária, plantio direto. Biomass production and nutrient accumulation by cover crops in the Brazilian Cerrado of Piauí State AbstractThe objective of this work was to evaluate the biomass production and nutrient accumulation in potential cover crops sown in different cropping systems in the Brazilian Cerrado of Piauí State. The experiment was conducted in the crop season 2010/2011 in the Serra do Quilombo, county of Bom Jesus, Piauí, Brazil. This study was arranged in split plot scheme, with soil management systems (conventional tillage and no-tillage) evaluated in plots and crop systems in subplots: S 1 -Soybean monoculture in the crop-season; S 2 -Soybean in crop-season and Pennisetum glaucum for off-season; S 3 -P. glaucum before soybean crop-season and Urochloa ruziziensis oversown on soybean in the phenological stage R 5.5 ; S 4 -Soybean crop-season and P. glaucum oversown on soybean in R 5.5 ; S 5 -Maize + U. ruziziensis simultaneously in crop-season. The experimental design was in randomized blocks, with four replications. The crop systems with oversown of P. glaucum and U. ruziziensis on soybean and the consortium maize + U. ruziziensis improved the biomass production, soil coverage and nutrient accumulation during the off-season in the Cerrado from Piauí State, Brazil. The nutrients with greater accumulation rate by cover crops were nitrogen and potassium.

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“…It is worth pointing out that, according to some authors (Benito et al, 2008;Ralisch et al, 2008;Cortez et al, 2009;Torres, 2009), productivity in long-standing notillage areas tends to be better than in conventionally tilled areas, mainly in years with uneven rainfall distribution. However, Carvalho et al (2004) found that in years with normal rainfall, conventional methods of soil tillage tend to enhance productivity.…”

Section: Seção VI -Manejo E Conservação Do Solo E Da áGua Introductionmentioning

confidence: 99%

Effects of different management systems on porosity of oxisols in Paraná, Brazil

Filho

Tessier

2010

Rev. Bras. Ciênc. Solo

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SUMMARYSoils play a fundamental role in the production of human foods. The Oxisols in the state of Paraná are among the richest and most productive soils in Brazil, but degradation and low porosity are frequently documented, due to intensive farming involving various management strategies and the application of high-tech solutions. This study aims to investigate changes in the porosity of two Red Oxisols (Latossolos Vermelhos), denoted LVef (eutroferric) and LVdf (dystroferric) under conventional and no-tillage soil management, with a succession of annual crops of soybean, maize and wheat over a continuous period of more than 20 years. After describing the soil profiles under native forest, no-tillage management and conventional tillage using the crop profile method, deformed and non-deformed soil samples were collected from the volumes most compacted by human intervention and the physical, chemical and mineralogical properties analyzed. The various porosity classes (total pore volume, inter-aggregate porosity between channels and biological cavities) and intra-aggregate porosity (determined in 10 cm 3 saturated clods subjected to a pressure of -10 kPa to obtain a pore volume with a radius (r eq ), ≥ ≥ ≥ ≥ ≥ 15 μ μ μ μ μm and < 15 μ μ μ μ μm). The results showed that the effects of no-tillage farming on porosity are more pronounced in both soil types. Porosity of the LVdf was higher than pf the LVef soil, whatever the management type. In the LVdf soil, only pores with a radius of > 15 μ μ μ μ μm were affected by farming whereas in the LVef soil, pores with a radius of < 15 μ μ μ μ μm were affected as well.Index terms: soil structure, crop profile method, no-tillage, conventional tillage.(1) Part of thesis the first author.

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Soja em sucessão a adubos verdes no sistema de plantio direto e convencional em solo de Cerrado

Cited by 28 publications

References 16 publications

Characterization of soil structure and porosity under long-term conventional tillage and no-tillage systems

Characterization of soil structure and porosity under long-term conventional tillage and no-tillage systems

Produção de fitomassa e acúmulo de nutrientes por plantas de cobertura no cerrado piauiense

Effects of different management systems on porosity of oxisols in Paraná, Brazil

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