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11 results

Physical Properties and Crop Management for Corn in an Albaqualf

Robson Giacomeli, Enio Marchesan, Maurício Limberger de Oliveira, Thomas Newton Martin, Gustavo Mack Teló, Gabriel Donato, [...]

09/Mar/2017

ABSTRACT Rice monoculture in lowlands can cause problems for management practices in crop fields, for example, in weed control. For this reason, corn in rotation with irrigated rice in lowlands may be advantageous, despite problems with soil compaction and water excess. The objective of this study was to evaluate soil physical properties and corn performance in soil management systems in an Albaqualf soil (lowlands). Two experiments were conducted in the field, in the 2013/14 and 2014/15 crop seasons. The experimental […]

Comparison of Methods for Determining Precompression Stress Based on Computational Simulation

Anderson Rodrigo da Silva, Renato Paiva de Lima

28/Jun/2016

ABSTRACT There are many methods for determining precompression stress (σp), whose value is affected by the slope of the soil compression curve. This study was designed to evaluate the hypothesis that for a certain compression curve all methods used to determine σp present the same value and accuracy. The aim of this study was to compare the accuracy and the relationship among seven of these methods by computational simulation of soil compression curves under nine scenarios. The following methods were […]

Pine Harvest Impact on Soil Structure of a Dystric Cambisol (Humic)

Adriano da Costa, Jackson Adriano Albuquerque, André da Costa, Maria Tereza Warmling, Bruno Afonso Magro

06/Jun/2016

ABSTRACT Traffic of heavy machinery at harvest and log extraction causes structural degradation of the soil, but studies on the effects of forest harvesting on soils with high organic matter content and exchangeable Al are scarce. The objective of this study was to evaluate the effect of mechanized forest harvesting operations on a Dystric Cambisol (Humic) with high organic matter (more 50 g kg1) content and exchangeable Al (more 6,0 cmolc kg-1), reforested with Pinus taeda L. The evaluated harvesting […]

RECOVERY OF AN OXISOL DEGRADED BY THE CONSTRUCTION OF A HYDROELECTRIC POWER PLANT

Joseane Carina Borges de Carvalho, Carlos Roberto Espindola, Marlene Cristina Alves, Getulio Coutinho Figueiredo, Sonia Carmela Falci Dechen

01/Dec/2015

ABSTRACT The removal of thick layers of soil under native scrubland (Cerrado) on the right bank of the Paraná River in Selvíria (State of Mato Grosso do Sul, Brazil) for construction of the Ilha Solteira Hydroelectric Power Plant caused environmental damage, affecting the revegetation process of the stripped soil. Over the years, various kinds of land use and management systems have been tried, and the aim of this study was to assess the effects of these attempts to restore the […]

Occasional Soil Turnover and Liming in a Clayey Oxisol Under a Consolidated No-tillage System

Jonez Fidalski, Renato Yagi, Cássio Antonio Tormena

01/Sep/2015

ABSTRACT Accumulation of nutrients and surface compaction have been reported after a long time under a no-tillage system. The aim of this study was to evaluate soil chemical properties, bulk density, and crop yield following a single mechanical intervention associated with liming in a clayey Oxisol under a NT system for 17 consecutive years in Pato Branco, southwestern Paraná, Brazil. A randomized block experimental design was used in a split-plot arrangement, with plowing and harrowing of the soil in the […]

MODELING OF SOIL LOAD-BEARING CAPACITY AS A FUNCTION OF SOIL MECHANICAL RESISTANCE TO PENETRATION

Cícero Ortigara, Moacir Tuzzin de Moraes, Henrique Debiasi, Vanderlei Rodrigues da Silva, Julio Cezar Franchini, Felipe Bonini da Luz

01/Jul/2015

Estimation of soil load-bearing capacity from mathematical models that relate preconsolidation pressure (σp) to mechanical resistance to penetration (PR) and gravimetric soil water content (U) is important for defining strategies to prevent compaction of agricultural soils. Our objective was therefore to model the σp and compression index (CI) according to the PR (with an impact penetrometer in the field and a static penetrometer inserted at a constant rate in the laboratory) and U in a Rhodic Eutrudox. The experiment consisted […]

EUCALYPTUS PRODUCTIVITY, SOIL PHYSICAL PROPERTIES AND ORGANIC MATTER FRACTIONS INFLUENCED BY TRAFFIC INTENSITY AND HARVEST RESIDUES

Guilherme Luiz de Jesus, Ivo Ribeiro Silva, Luís Fernando Januário Almeida, Mateus Alves dos Santos, Fernando Palha Leite, Júlio César Lima Neves

01/Jul/2015

The number of machine passes, types of wheels, and high soil moisture during harvest operations affect the soil compaction process. The impacts of these factors and alternatives to reduce them must be better understood. This study evaluated the impact of different traffic intensities of a loaded forwarder and the effect of different management conditions of eucalyptus harvest residues on productivity, soil physical properties, and organic matter at the end of the subsequent rotation in two Oxisols in the State of […]

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 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 […]

COMPRESSIBLITY AND PENETRABILITY OF LATOSSOLO VERMELHO-AMARELO DISTRÓFICO (OXISOL) UNDER VARIED MANAGEMENT SYSTEMS AND LAND USES

Eudes Neiva Júnior, Wellington Willian Rocha, Bruno Silva Pires, Múcio Mágno de Melo Farnezi, Moacir de Souza Dias Junior, Danilo Fernandes Borges de Freitas, [...]

01/Jan/2015

Soil compaction is one of the main degradation causes, provoked by inappropriate agricultural practices that override the limitations of the soil physical properties. Preconsolidation pressure and penetration resistance have proved effective as alternative to assess and identify soil compaction. Based on the interpretation of these physico-mechanical parameters, compaction can be prevented with a better adjusted soil management. This study was performed to generate preconsolidation pressure and penetration resistance models for Latososlo Vermelho-Amarelo distrófico (Oxisol) under various managements and uses; and […]

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