65 results

Relationships between microbial activity and soil physical and chemical properties in native and reforested Araucaria angustifolia forests in the state of São Paulo, Brazil

Jamil de Morais Pereira, Dilmar Baretta, Daniel Bini, Rafael L. de F. Vasconcellos, Elke Jurandy Bran Nogueira Cardoso

01/Jun/2013

Araucaria angustifolia (Bert.) O. Kuntze is the main component of the Mixed Ombrophilous forest and, in the State of São Paulo, it is associated with a high diversity of soil organisms, essential for the maintenance of soil quality, making the conservation of this ecosystem a major and pressing challenge. The objective of this study was to identify the physical and chemical properties that are most closely correlated with dehydrogenase enzyme activity, basal respiration and microbial biomass under native (NF) and […]

Least limiting water range in a typic haplorthox after the first continuous grazing period of brachiaria ruziziensis in integrated crop-livestock system

Jonez Fidalski, Cássio Antonio Tormena, Sérgio José Alves

01/Jun/2013

The least limiting water range (LLWR) is one of the best indicators of soil physical quality in intensive production systems. The objective of this study was to evaluate the physical quality of a Typic Haplorthox by the LLWR after three crop growing seasons and the first year of crop-livestock integration in Xambrê, northwestern Paraná, Brazil. The experiment was established in a randomized block design with three replications. Treatments consisted of four brachiaria heights before grazing (0.10; 0.20; 0.30, and 0.40 […]

Methods of weed control and their impacts on microbial quality of soil under coffee

Rogério Melloni, Gabriela Belleze, Arthur Manuel Silva Pinto, Luiza Barbosa de Paula Dias, Emilienne Margueritte Silve, Eliane Guimarães Pereira Melloni, [...]

01/Feb/2013

Minas Gerais stands out as the largest coffee-producing state of Brazil. This crop is extremely susceptible to weeds, which can be handled by manual, mechanized and/or chemical methods, which strongly affect production costs and soil quality. In this sense, the objective of this study was to evaluate the effect of different weed control methods in and between coffee rows on the soil microbiota and its processes. For this purpose, soil samples were taken in April 2010 from an Oxisol on […]

Physical quality of untilled oxisol subjected to mechanical and biological decompaction

Sérgio Damaso da Silveira Junior, Alvaro Pires da Silva, Getulio Coutinho Figueiredo, Cássio Antonio Tormena, Neyde Fabíola Balarezo Giarola

01/Dec/2012

Chiseling and winter cover crops have been adopted to improve the soil physical properties related to aeration. This study aimed to evaluate the effects of winter cover crops and chiseling on physical properties of a Typic Hapludox, clayey texture, after 16 years under no-tillage. The treatments were applied in May 2009, as follows: no-tillage (PD), no-tillage mechanically chiseled to a depth of 0.25 m (PD-E), and biologically aerated soil with no-tillage radish (PD-B). The experiment was arranged in a randomized […]

Chemical and biochemical properties of Araucaria angustifolia (Bert.) Ktze. forest soils in the state of São Paulo

Fernanda de Carvalho, Fatima Maria de Souza Moreira, Elke Jurandy Bran Nogueira Cardoso

01/Aug/2012

Araucaria angustifolia, commonly named Araucaria, is a Brazilian native species that is intensively exploited due to its timber quality. Therefore, Araucaria is on the list of species threatened by extinction. Despite the importance of soil for forest production, little is known about the soil properties of the highly fragmented Araucaria forests. This study was designed to investigate the use of chemical and biological properties as indicators of conservation and anthropogenic disturbance of Araucaria forests in different sampling periods. The research […]

Physical properties and organic carbon content of a Rhodic Kandiudox fertilized with pig slurry and poultry litter

Luiz Paulo Rauber, Cristiano Dela Piccolla, Andréia Patrícia Andrade, Augusto Friederichs, Álvaro Luiz Mafra, Juliano Corulli Corrêa, [...]

01/Aug/2012

The impact of pig slurry and poultry litter fertilization on soils depends on the conditions of use and the amounts applied. This study evaluated the effect of organic fertilizers after different application periods in different areas on the physical properties and organic carbon contents of a Rhodic Kandiudox, in Concordia, Santa Catarina, in Southern Brazil. The treatments consisted of different land uses and periods of pig and poultry litter fertilization: silage maize (M7 years), silage maize (M20 years), annual ryegrass […]

Physical properties and particle-size fractions of soil organic matter in crop-livestock integration

Carolina Tirloni, Antonio Carlos Tadeu Vitorino, Anderson Cristian Bergamin, Luiz Carlos Ferreira de Souza

01/Aug/2012

Crop-livestock integration represents an interesting alternative of soil management, especially in regions where the maintenance of cover crops in no-tillage systems is difficult. The objective of this study was to evaluate soil physical and chemical properties, based on the hypothesis that a well-managed crop-livestock integration system improves the soil quality and stabilizes the system. The experiment was set up in a completely randomized design, with five replications. The treatments were arranged in a 6 x 4 factorial design, to assess […]

Temporary effect of chiseling on the compaction of a Rhodic Hapludox under no-tillage

Sâmala Glícia Carneiro Silva, Álvaro Pires da Silva, Neyde Fabíola Balarezo Giarola, Cássio Antônio Tormena, João Carlos de Moraes Sá

01/Apr/2012

Mechanical chiseling has been used to alleviate the effects of compaction in soils under no-tillage (NT). However, its effect on the soil physical properties does not seem to have a defined duration period. The purpose of this study was to evaluate the behavior of the bulk density (BD) and degree of compaction (DC) at different soil depths, after chiseling in no-tillage, for one year. The experiment was performed in Ponta Grossa, Paraná State, Brazil, using an Oxisol (Rhodic Hapludox). Bulk […]

Use of the S-index to evaluate soil physical quality

Celsemy Eleutério Maia

01/Dec/2011

Nowadays the concept of soil physical quality is well-established, based mainly on the indices that quantify soil quality. The S index is a new indicator of soil physical quality related to important soil characteristics. The purpose of this study was to evaluate the method of obtaining the S index and the derivative of the function of the of water retention curve, using the transformation ln(h) or not, and assess the problem of units and the restriction m = 1 – […]

Microbial and soil properties in restoration areas in the jequitinhonha valley, Minas Gerais

Danielle Cristina Fonseca Santos, Paulo Henrique Grazziotti, Alexandre Christófaro Silva, Aldo Vilar Trindade, Enilson de Barros Silva, Lidiomar Soares da Costa, [...]

01/Dec/2011

To mitigate the impacts of eucalypt monoculture, forestry companies in the Upper Jequitinhonha Valley (MG) have adopted the insertion of strips of native vegetation in-between the commercial plantations. The method used for the creation of these corridors is to allow spontaneous regrowth of native vegetation in areas previously under eucalypt. The objective of this study was to evaluate the effect of cover crops on microbial and soil properties for a detailed description of the restoration process of native vegetation in […]

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