Soil Respiration
Mostrando 25-36 de 137 artigos, teses e dissertações.
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25. Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane
Soil CO2 emission (FCO2) is one of the main sources of carbon release into the atmosphere. Moreover, FCO2 is related to soil attributes governing the transfer of gases from soil to the atmosphere. This study aimed firstly to describe the spatial variability of hematite (Hm), goethite (Gt), iron extracted with sodium dithionite-citrate-bicarbonate (Fed) conte
Sci. agric. (Piracicaba, Braz.). Publicado em: 2015-02
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26. Humic fractions of forest, pasture and maize crop soils resulting from microbial activity
Humic substances result from the degradation of biopolymers of organic residues in the soil due to microbial activity. The objective of this study was to evaluate the influence of three different ecosystems: forest, pasture and maize crop on the formation of soil humic substances relating to their biological and chemical attributes. Microbial biomass carbon
Braz. J. Microbiol.. Publicado em: 2014-09
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27. Soil respiration in cucumber field under crop rotation in solar greenhouse
Crop residues are the primary source of carbon input in the soil carbon pool. Crop rotation can impact the plant biomass returned to the soil, and influence soil respiration. To study the effect of previous crops on soil respiration in cucumber (Cucumis statirus L.) fields in solar greenhouses, soil respiration, plant height, leaf area and yield were measure
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-08
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28. Agroforestry systems, nutrients in litter and microbial activity in soils cultivated with coffee at high altitude
Agroforestry systems are an alternative option for sustainable production management. These systems contain trees that absorb nutrients from deeper layers of the soil and leaf litter that help improve the soil quality of the rough terrain in high altitude areas, which are areas extremely susceptible to environmental degradation. The aim of this study was to
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-04
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29. Soil and crop residue CO2-C emission under tillage systems in sugarcane-producing areas of southern Brazil
Appropriate management of agricultural crop residues could result in increases on soil organic carbon (SOC) and help to mitigate gas effect. To distinguish the contributions of SOC and sugarcane (Saccharum spp.) residues to the short-term CO2-C loss, we studied the influence of several tillage systems: heavy offset disk harrow (HO), chisel plow (CP), rotary
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-10
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30. Soil health: looking for suitable indicators. What should be considered to assess the effects of use and management on soil health?
Soil Health refers to the ecological equilibrium and the functionality of a soil and its capacity to maintain a well balanced ecosystem with high biodiversity above and below surface, and productivity. To understand and use soil health as a tool for sustainability, physical, chemical, and biological properties must be employed to verify which respond to the
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-08
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31. Atividade microbiana e propriedades bioquímicas do solo sob a adição de composto orgânico e palha de café / Microbial activity and biochemical properties of the soil after the addition of organic compost and coffee trash
Na agricultura moderna e com a adoção de práticas de manejo mais sustentáveis, o uso de resíduos orgânicos na agricultura tem sido visto como uma importante escolha, principalmente por se tratar de materiais recicláveis no solo. O trabalho foi conduzido com a adição de composto orgânico enriquecido com fosfato natural (COM), nas quantidades de 0, 1
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2012
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32. Physiological response of oil palm interspecific hybrids (Elaeis oleifera H.B.K. Cortes versus Elaeis guineensis Jacq.) to water deficit
Water supply is the main yield-limiting abiotic factor of oil palm in Colombia. To determine the effect of water deficit on the physiology of oil palm and to assess the tolerance degree to this condition, interspecific Elaeis oleifera versus Elaeis guineensis 'U1273', 'U1859', 'U1914', and 'U1937' hybrids were planted for 60 days in soil with different water
Braz. J. Plant Physiol.. Publicado em: 2012-12
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33. Reanálise CFSR-NCEP aplicada ao modelo SiB2 na simulação de fluxos de CO2 sobre o cultivo de soja em Cruz Alta.
The present work aimed to evaluate the behavior of CO2 fluxes, run by the Simple Biosphere Model (SiB2), by adopting CFSR-NCEP data reanalyzed as an atmospheric boundary condition. A statistical analysis was used in order to validate the results obtained using a coefficient for the adjusted model based on the simulation parameters when compared to the data o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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34. Atributos químicos e microbiológicos de solo cultivado com cana-de-açúcar sob manejo convencional e orgânico / Chemical and microbiological attributes of soil cultivated with sugar cane under conventional and organic managements
A identificação de indicadores de qualidade de solo que demonstrem as alterações ocorridas em áreas agrícolas é importante para determinar a sustentabilidade do sistema de cultivo. A biomassa e a atividade microbiana do solo têm sido apontadas como importantes indicadores de qualidade do solo, especialmente quando se avalia o efeito de diferentes sis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/10/2011
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35. Efeitos da aplicaÃÃo de tortas de pinhÃo manso e mamona no crescimento de feijÃo caupi e nas propriedades quÃmicas e biolÃgicas de um solo degradado de IrauÃuba-CE. / Effect of jatropha and castor bean seed residues on soil microbiology and soil fertility of a degraded soil of IrauÃuba-CE
As tortas resultantes da extraÃÃo do Ãleo das sementes de PinhÃo manso e Mamona constituem-se excelentes fontes de matÃria orgÃnica, ricas em nitrogÃnio, fÃsforo, potÃssio e outros nutrientes. No entanto, o problema està relacionado ao direcionamento dado a esses resÃduos vegetais, quando gerados em grande escala, pois a destinaÃÃo inadequada de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/07/2011
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36. Ecophysiological and anatomical changes due to uptake and accumulation of heavy metal in Brachiaria decumbens
The growth and developmental characteristics of grasses and their high biodiversity make such plants suitable for remediation of areas contaminated by heavy metals. Nevertheless, heavy metal toxic effect on the plants may cause alteration in their metabolic pathways, such as photosynthesis, respiration, and growth, modifying plant anatomy. This work aimed to
Scientia Agricola. Publicado em: 2011-10