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22 results

Biochemical and Biological Properties of Soil from Murundus Wetlands Converted into Agricultural Systems

Luciene Nunes Barcelos Martins, Flávia Louzeiro de Aguiar Santiago, Marcela Susana Montecchia, Olga Susana Correa, Orivaldo José Saggin Junior, Edicarlos Damacena de Souza, [...]

14/Jun/2019

ABSTRACT The implementation of conservationist systems that improve soil properties and reduce the impacts of the conversion of native areas is fundamental for feasible agricultural exploitation. This study aimed to evaluate the impact on soil biological properties caused by the conversion of murundus fields into agricultural systems and verify the ability of the no-tillage conservation system to recover these properties over the years. Treatments consisted of three agricultural areas subjected to the same management (no-tillage), in a chronosequence (7, 11, […]

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Nitrogen application rates, sources, and times affecting chlorophyll content and wheat yield

Eduardo Quimello Theago, Salatiér Buzetti, Marcelo Carvalho Minhoto Teixeira Filho, Marcelo Andreotti, Marcio Mahmoud Megda, Cleiton Gredson Sabin Benett

01/Dec/2014

To achieve high wheat yield, correct management of N fertilization and the use of high yield potential cultivars are necessary. The aim of this study was to evaluate the effects of different application rates and sources of N, applied totally at sowing or in topdressing, on grain yield and yield components of two irrigated wheat cultivars under a no-till system, grown in a Cerrado (Brazilian tropical savanna) region of low altitude. A randomized block design was used in a 5 […]

The effects of land use and soil management on the physical properties of an Oxisol in Southeast Brazil

Getulio de Freitas Seben Junior, José Eduardo Corá, Rattan Lal

01/Aug/2014

Soils of the tropics are prone to a decrease in quality after conversion from native forest (FO) to a conventional tillage system (CT). However, the adoption of no-tillage (NT) and complex crop rotations may improve soil structural quality. Thus, the aim of this study was to evaluate the physical properties of an Oxisol under FO, CT, and three summer crop sequences in NT: continuous corn (NTcc), continuous soybean (NTcs), and a soybean/corn rotation (NTscr). Both NT and CT decreased soil […]

Effect of cropping systems in no-till farming on the quality of a Brazilian Oxisol

Getulio de Freitas Seben Junior, José Eduardo Corá, Rattan Lal

01/Aug/2014

The no-till system with complex cropping sequences may improve the structural quality and carbon (C) sequestration in soils of the tropics. Thus, the objective of this study was to evaluate the effects of cropping sequences after eight years under the no-till system on the physical properties and C sequestration in an Oxisol in the municipality of Jaboticabal, Sao Paulo, Brazil. A randomized split-block design with three replications was used. The treatments were combinations of three summer cropping sequences – corn/corn […]

Chemical and biological properties of phosphorus-fertilized soil under legume and grass cover (Cerrado region, Brazil)

Marcelo Fernando Pereira Souza, Mariana Pina da Silva, Orivaldo Arf, Ana Maria Rodrigues Cassiolato

01/Dec/2013

The use of cover crops has been suggested as an effective method to maintain and/or increase the organic matter content, while maintaining and/or enhancing the soil physical, chemical and biological properties. The fertility of Cerrado soils is low and, consequently, phosphorus levels as well. Phosphorus is required at every metabolic stage of the plant, as it plays a role in the processes of protein and energy synthesis and influences the photosynthetic process. This study evaluated the influence of cover crops […]

Legumes and forage species sole or intercropped with corn in soybean-corn succession in midwestern Brazil

Gessí Ceccon, Luiz Alberto Staut, Edvaldo Sagrilo, Luís Armando Zago Machado, Danieli Pieretti Nunes, Valdecir Batista Alves

01/Feb/2013

The feasibility of no-tillage in the Cerrado (Savanna-like vegetation of Brazil) depends on the production of sufficient above-ground crop residue, which can be increased by corn-forage intercropping. This study evaluated how above-ground crop residue production and yields of soybean and late-season corn in a soybean-corn rotation were influenced by the following crops in the year before soybean: corn (Zea mays L.) intercropped with Brachiaria (Urochloa) brizantha cv. Marandu, B. decumbens cv. Basilisk, B. ruziziensis, cv. comum., Panicummaximum cv. Tanzânia, sunn […]

Arsenate and cadmium content in soils of the cerrado bioma

Mari Lucia Campos, Luiz Roberto Guimarães Guilherme, João José Granate de Sá e Melo Marques, Nilton Curi, Alessandra Siqueira Antunes Araújo, David José Miquelluti, [...]

01/Feb/2013

Knowledge on As and Cd levels in soils is important to monitor the entry of these elements into the food chain from anthropogenic sources. The purpose of this study was to determine the natural content of As and Cd in representative soils of the Cerrado region, Brazil. Soil samples were collected from three sub-regions: G (eastern Goiás), T (Triângulo Mineiro) and N (northeastern MG). To determine the soil levels of As and Cd, samples were digested by acid attack in […]

Phosphorus distribution in soil as affected by cropping systems and phosphate fertilization management

Rafael de Souza Nunes, Djalma Martinhão Gomes de Sousa, Wenceslau J. Goedert, Lúcio José Vivaldi

01/Jun/2011

Cropping systems and management of phosphate fertilization affect P availability in the soil, its accessibility for plants and finally, crop yields. This calls for an evaluation of P distribution in the soil profile, in long-term experiments, to understand the impact of each cropping system and fertilization management on this process. An area of Embrapa Cerrados, in Planaltina – DF, in an Oxisol, with very low P content at the beginning of the experiment, was cultivated for 14 years with soybean […]

In-furrow inoculation with Bradyrhizobium alternatively to seed inoculation of soybean

Jerri Édson Zilli, Vicente Gianluppi, Rubens José Campo, Janaina Ribeiro Costa Rouws, Mariangela Hungria

01/Dec/2010

Biological N fixation in soybean is indispensable in Brazil, sparing the use of mineral N and reducing crop production costs. The objective of this study was to compare in-furrow inoculation of soybean with Bradyrhizobium to the traditional practice of seed inoculation, in an experiment performed in a soil with low organic matter content and without soybean-nodulating rhizobia. A field experiment was carried out in the Cerrado of Roraima in 2006 and repeated in 2007, with the treatments: (1) control (no […]

Microbial and enzymatic activity in soil after organic composting

Isabel Cristina Vinhal-Freitas, Dalcimar Regina Batista Wangen, Adão de Siqueira Ferreira, Gilberto Fernandes Corrêa, Beno Wendling

01/Jun/2010

Microbial activity and biochemical properties are important indicators of the impact of organic composting on soil. The objective of this study was to evaluate some indicators of soil microbial and biochemical processes after application of compost (household waste). A Typic Acrustox, sampled at a depth of 10 cm under Cerrado biome vegetation, was evaluated in three treatments: control (soil without organic compost amendment) and soil with two doses of domestic organic compost (10 and 20 g kg-1 soil). The following properties were evaluated: […]

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