401 results

Soil Properties and Carbon Accumulation in an Integrated Crop-Livestock System Under No-Tillage

Nídia Raquel Costa, Marcelo Andreotti, Keny Samejima Mascarenhas Lopes, Kazuo Leonardo Yokobatake, João Paulo Ferreira, Cristiano Magalhães Pariz, [...]

01/May/2015

In production systems such as the integrated crop-livestock system (ICL) under no-tillage, improvements have been observed in chemical, physical, and biological soil properties. Therefore, we aimed to evaluate the changes in chemical and physical soil properties, as well as carbon (C) accumulation, in an Oxisol under irrigated conditions in the Cerrado (Brazilian tropical savanna) in an ICL system under no-tillage. The experiment was carried during the growing of 2010/2011, 2011/2012, and 2012/2013. A randomized block experimental design with four replications […]

Grazing Height of Brachiaria and Stocking Rate Limited by Soil Physical Properties Three Years Into an Integrated Soybean Crop-Livestock System

Jonez Fidalski, Sérgio José Alves

01/May/2015

Management of forage grazing height by cattle may compromise soil physical properties. The objective of this study was to evaluate the influence of grazing height of brachiaria (Urochloa ruziziensis) and the average stocking rate, after three years into an integrated soybean crop-livestock system, in the physical attributes of a Haplorthox (Rhodic Ferralsol). A randomized complete block experimental design with three replications was used. Five treatments were evaluated in 1 ha experimental plots: grazing heights of 10, 20, 30, and 40 […]

Soil Aggregation, Organic Carbon Concentration, and Soil Bulk Density As Affected by Cover Crop Species in a No-Tillage System

Adriano Stephan Nascente, Yuncong Li, Carlos Alexandre Costa Crusciol

01/May/2015

Soil aggregation and the distribution of total organic carbon (TOC) may be affected by soil tillage and cover crops. The objective of this study was to determine the effects of crop rotation with cover crops on soil aggregation, TOC concentration in the soil aggregate fractions, and soil bulk density under a no-tillage system (NTS) and conventional tillage system (CTS, one plowing and two disking). This was a three-year study with cover crop/rice/cover crop/rice rotations in the Brazilian Cerrado. A randomized […]

Soil Load-Bearing Capacity in Orange Grove Conservation Systems

Jonez Fidalski, Karina Maria Vieira Cavalieri-Polizeli, Cássio Antonio Tormena, Guilherme Anghinoni, Pedro Antonio Martins Auler

01/May/2015

Conservation tillage systems in orange groves can increase soil load-bearing capacity minimizing their risks of soil compaction. The objective of this study was to evaluate load-bearing capacity through preconsolidation pressure and its dependence on water content, bulk density, and organic carbon of a Typic Paleudult soil 18 years after setting up permanent plant cover between the rows of an orange grove. A randomized block experimental design was used, with three replications. Three groundcover treatments subjected to mowing between the rows […]

Organic Matter Fractions and Quality of the Surface Layer of a Constructed and Vegetated Soil After Coal Mining. I – Humic Substances and Chemical Characterization

Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos, Eloy Antonio Pauletto, Luiz Fernando Spinelli Pinto, Flávia Fontana Fernandes, Letiane Helwig Penning, [...]

01/May/2015

After open coal mining, soils are “constructed”, which usually contain low levels and quality of organic matter (OM). Therefore, the use of plant species for revegetation and reclamation of degraded areas is essential. This study evaluated the distribution of carbon (C) in the chemical fractions as well as the chemical characteristics and humification degree of OM in a soil constructed after coal mining under cultivation of perennial grasses. The experiment was established in 2003 with the following treatments: Hemarthria altissima […]

Organic Matter Fractions and Quality of the Surface Layer of a Constructed and Vegetated Soil After Coal Mining. II – Physical Compartments and Carbon Management Index

Otávio dos Anjos Leal, Rosa Maria Vargas Castilhos, Eloy Antonio Pauletto, Luiz Fernando Spinelli Pinto, Clenio Nailto Pillon, Letiane Helwig Penning, [...]

01/May/2015

Soils constructed after mining often have low carbon (C) stocks and low quality of organic matter (OM). Cover crops are decisive for the recovery process of these stocks, improving the quality of constructed soils. Therefore, the goal of this study was to evaluate the effect of cover crops on total organic C (TOC) stocks, C distribution in physical fractions of OM and the C management index (CMI) of a soil constructed after coal mining. The experiment was initiated in 2003 […]

Mercury Content in Soils of Southeastern Brazil Without Anthropogenic Influence and its Correlation with Soil Characteristics

Liliane Catone Soares, Lucília Alves Linhares, Fernando Barboza Egreja, Cláudia Carvalhinho Windmoller, Maria Irene Yoshida

01/May/2015

Correlation between physical and chemical characteristics of soils and their natural mercury content is important for identifying the parameters that most influence Hg retention in these soils and its distribution in different environmental compartments. The aim of this study was to quantify the Hg content of tropical soils without anthropogenic influence and correlate it with physical and chemical soil characteristics. The present study is relevant because most research focuses on contaminated soils and, in the case of tropical soils, research […]

APPRAISAL OF THE SNAP MODEL FOR PREDICTING NITROGEN MINERALIZATION IN TROPICAL SOILS UNDER EUCALYPTUS

Philip James Smethurst, José Leonardo de Moraes Gonçalves, Ana Paula Pulito, Simone Gomes, Keryn Paul, Clayton Alcarde Alvares, [...]

01/Mar/2015

The Soil Nitrogen Availability Predictor (SNAP) model predicts daily and annual rates of net N mineralization (NNM) based on daily weather measurements, daily predictions of soil water and soil temperature, and on temperature and moisture modifiers obtained during aerobic incubation (basal rate). The model was based on in situ measurements of NNM in Australian soils under temperate climate. The purpose of this study was to assess this model for use in tropical soils under eucalyptus plantations in São Paulo State, […]

LEAST LIMITING WATER RANGE IN CONSTRUCTED SOIL AFTER COAL MINING IN DIFFERENT CRITICAL LIMITS OF PENETRATION RESISTANCE AND WATER CONTENT

Ezequiel Cesar Carvalho Miola, Eloy Antonio Pauletto, Cláudia Liane Rodrigues de Lima, Luiz Fernando Spinelli Pinto, Luis Carlos Timm

01/Mar/2015

In quantifying the least limiting water range (LLWR), different critical limits of resistance to penetration (RP) and moisture at field capacity (θFC) are generally used. For agricultural soils, these values are documented in the literature. However, for constructed soil after coal mining, there is a large information gap. The aim of this study was to quantify the least limiting water range of a constructed soil under different cover crops in a coal mining area in Candiota, RS (Southern Brazil), considering […]

NUTRIENT DEMAND BY THE CARROT CROP IS INFLUENCED BY THE CULTIVAR

Rosiane Filomena Batista Almeida Aquino, Natália Silva Assunção, Leonardo Angelo Aquino, Priscila Maria de Aquino, Guilherme Anthony de Oliveira, André Mundstock Xavier de Carvalho

01/Mar/2015

Farmers must carefully choose the cultivar to be grown for a successful carrot crop. The yield potential of the cultivar may influence nutrient demand and should be known to plan for fertilization application. The aim of this study was to evaluate the cultivar effect on carrot yield and on the nutrient content and quantities allocated to leaves and roots. Three experiments were set up in two crop seasons in Rio Paranaíba, MG, Brazil. In the first season, typical summer, 10 […]

1 35 36 37 38 39 41