Consulta: creatorFacets:"Ramos,Maria Lucrecia Gerosa"
Registros recuperados: 9
Data/hora: 03/06/2024 08:34:44

Differences in ureide and amino acid content of water stressed soybean inoculated with Bradyrhizobium japonicum and B. elkanii
Provedor de dados: 86
Autores: Ramos,Maria Lucrecia Gerosa; Parsons,Richard; Sprent,Janet Irene.
The objective of this work was to study the response to water stress of a drought sensitive soybean cultivar inoculated with Bradyrhizobium japonicum (strain CB1809, Semia 586) and B. elkanii (strain 29W, Semia 5019). CB1809 nodulated plants produced a significantly higher root fraction (19%) than 29W (14.6%). Plants inoculated with CB1809 produced less nodules and accumulated more nitrogen than those inoculated with 29W. In general, low amounts of ureides in nodules were found in watered plants inoculated with either CB1809 or 29W strains, but those levels were five-fold increased in stressed plants inoculated with CB1809. Nodules formed by strain CB1809 had aspartate and glutamate as major amino acids, while those formed by 29W had glutamate, asparagine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Alanine; Asparagine; Aspartate; Glutamate; Nitrogen fixation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000500005

Dynamics of soil microbiological attributes under integrated production systems, continuous pasture, and native cerrado
Provedor de dados: 86
Autores: Oliveira,Willian Roberson Duarte de; Ramos,Maria Lucrecia Gerosa; Carvalho,Arminda Moreira de; Coser,Thais Rodrigues; Silva,Antônio Marcos Miranda; Lacerda,Manuel Messias; Souza,Kleberson Worslley; Marchão,Robélio Leandro; Vilela,Lourival; Pulrolnik,Karina.
Abstract The objective of this work was to evaluate the dynamics of soil microbiological attributes under integrated production systems, continuous pasture, and native cerrado. The study was conducted in a transition area from crop to livestock. Four areas with different land uses were evaluated: an integrated crop-livestock-forestry system (ICLFS), cultivated with Eucalyptus urograndis alley cropping, spaced 2x2 m between plants and 22 m between alleys; an integrated crop-livestock system (ICLS); besides two adjacent areas of native cerrado and continuous pasture, used as a reference. For the assessment of microbiological attributes, soil samples were taken in the 0.00-0.10, 0.10-0.20, and 0.20-0.30-m layers, in February 2012 and February 2014 (rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Integrated crop-livestock-forestry system; Soil management; Soil microbial biomass; Soil quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901501

Effect of water stress on nitrogen fixation and nodule structure of common bean
Provedor de dados: 86
Autores: Ramos,Maria Lucrecia Gerosa; Parsons,Richard; Sprent,Janet Irene; James,Euan Kelvin.
The aim of this work was to investigate the effect of water stress on N2 fixation and nodule structure of two common bean (Phaseolus vulgaris L.) cultivars Carioca and EMGOPA-201. Plants were harvested after five and eight days of water stress. Carioca had lower nodule dry weight on both water stress periods; shoot dry weight was lower at five days water stress and did not differ from control after eight days stress. Both cultivars had lower nitrogenase activity than control after five and eight days water stress. For both cultivars, after eight days stress bacteroid membranes were damaged. Carioca presented more pronounced damage to infected tissue, with host cell vacuolation and loss of the peribacteroid membrane at five days after stress; at eight days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Nitrogenase; Leaf water potential; Nodulation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000300002

Nitrogênio da biomassa microbiana em solo cultivado com soja, sob diferentes sistemas de manejo, nos Cerrados
Provedor de dados: 86
Autores: Perez,Kátia Sueli Sivek; Ramos,Maria Lucrecia Gerosa; McManus,Concepta.
O objetivo deste trabalho foi quantificar o nitrogênio da biomassa microbiana do solo (NBMS), em diferentes manejos: semeadura direta (SD), uma gradagem (GR), subsolagem e duas gradagens (SG), comparado com solo sob cerrado nativo, em um Latossolo Vermelho-Amarelo argiloso, no Distrito Federal. Avaliaram-se os solos em cinco profundidades, 0-5, 5-10, 10-20, 20-30 e 30-40 cm; e em quatro épocas: antes do preparo do solo, 30 dias após a germinação (30 DAG), floração e após colheita da soja. O nitrogênio da biomassa microbiana em solo não perturbado, apresentou maiores valores em todas as épocas estudadas comparadas com os solos em diferentes manejos. Houve diferença significativa nas camadas 0-5, 5-10 e 10-20 cm, exceto aos 30 dias após a germinação. A razão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Gradagem; Plantio direto; Subsolagem.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000200006

Carbono e nitrogênio da biomassa microbiana em resposta a diferentes sistemas de manejo em um latossolo vermelho no Cerrado
Provedor de dados: 90
Autores: Figueiredo,Cícero Célio de; Resck,Dimas Vital Siqueira; Gomes,Antonio Carlos; Ferreira,Eloisa Aparecida Belleza; Ramos,Maria Lucrecia Gerosa.
A biomassa microbiana é um componente vivo da matéria orgânica sensível às mudanças causadas pelos diferentes sistemas de manejo do solo. Para alcançar os objetivos propostos neste trabalho, foi realizado um experimento de longa duração na área experimental da Embrapa Cerrados, Planaltina, Distrito Federal. Foram estudados oito sistemas de manejo do solo, formados pelo uso de diferentes implementos agrícolas e épocas de incorporação de restos culturais. As amostras de solo foram coletadas em cinco profundidades: 0-5, 5-10, 10-20, 20-30 e 30-40 cm, com três repetições, em três épocas: antes do plantio do milho, 30 dias após a emergência e na floração da cultura. Os tratamentos sob plantio direto apresentaram diferenças nos teores de C e N da biomassa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plantio direto; Arado de discos; Arado de aivecas; Escarificador.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000300015

Cover cropping system and mulching can shape soil microbial status in fruit orchards
Provedor de dados: 63
Autores: Cruz,Andre Freire; Pires,Marcio de Carvalho; Nascimento,Lennon Kaique Beda do; Ramos,Maria Lucrecia Gerosa; Oliveira,Sebastiao Alberto; Blum,Luiz Eduardo Bassay; Yamanishi,Osvaldo Kiyoshi.
ABSTRACT The use of cover crop in agricultural fields has been well elucidated, especially regarding nitrogen fixation from legume crops and their function as weed protection. Furthermore, to cover crops can benefit the soil microbial community. This study aimed to evaluate and compare the benefits of mulching and cover cropping systems on soil microbial growth and activity, and their effects on plant mineral nutrition in pomelo (Citrus maxima ) and macadamia ( Macadamia integrifolia ) orchards. The treatments included: 1) control [Glyphosate herbicide (Roundup at 4 l per ha)], 2) manual weed control, 3) mulching with dead leaves from their respective trees (macadamia and pomelo), 4) millet, 5) faba bean, 6) millet + faba bean. All the treatments were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pomelo; Faba bean; Macadamia; Millet; Mycorrhiza.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400201

Characterization of wheat genotypes for drought tolerance and water use efficiency
Provedor de dados: 63
Autores: Soares,Guilherme Filgueiras; Ribeiro Júnior,Walter Quadros; Pereira,Lucas Felisberto; Lima,Cristiane Andréa de; Soares,Daiane dos Santos; Muller,Onno; Rascher,Uwe; Ramos,Maria Lucrecia Gerosa.
ABSTRACT: The selection of wheat genotypes according to their drought tolerance is essential to off-season cultivation. The objective of this work was to characterize wheat genotypes through yield and components, morphological characteristics under water stress, and irrigated water use efficiency in the Cerrado region in Brazil. Genotypes were planted during the winters of 2016 and 2017 since there is no precipitation during this season and water levels can be measured. They were then submitted to four water regimes: WR1, WR2, WR3, and WR4, representing 100 %, 83 %, 50 %, and 30 % of evapotranspiration replacement. The following variables were evaluated: peduncle length (PL), number of ears m−2 (NE m−2), hectoliter weight (HW), thousand grain weight (TGW),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Plant phenotyping; Water regimes; Irrigation gradient.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500602

Soil quality indicators under management systems in a Quilombola community in the Brazilian Cerrado
Provedor de dados: 63
Autores: Silva,Antonio Marcos Miranda; Ramos,Maria Lucrecia Gerosa; Nascimento,Robervone Severina de Melo Pereira do; Silva,Alberto do Nascimento; Silva,Stefany Braz; Cardoso,Elke Jurandy Bran Nogueira; Paula,Alessandra Monteiro de.
ABSTRACT: Soil management systems exert different effects on soil attributes, especially on the organic matter content, and, consequently, the soil aggregation. The aim of this study was to evaluate the impact of different land uses practiced by quilombola family farmers on water stable aggregates, glomalin and organic carbon in soil aggregates. Soil samples were collected at depths of 0-10 and 10-20 cm from areas cultivated under the following management systems: 1) conventional corn plantation (MA), 2) cultivation of citrus trees intercropped with annual crops (AC) (a conservationist approach), 3) pasture of Brachiaria (Urochloa spp.) (PA), and, as reference, an area of the Cerrado (CR) free of any anthropogenic interference. The studied areas were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodic Hapludox; Water-stable aggregates; Soil protein; Quilombo.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600518

Seasonal Variation of Plant Mineral Nutrition in Fruit Trees
Provedor de dados: 52
Autores: Cruz,André Freire; Almeida,Glicia Maria de; Wadt,Paulo Guilherme Salvador; Pires,Marcio de Carvalho; Ramos,Maria Lucrecia Gerosa.
Abstract This research evaluated the monthly variation of plant mineral nutrition in six species of fruit trees over a year. Leaf samples were taken from the fruit trees and nutritional status (N, P, K, Ca, Mg, Fe, Zn, Cu, Mn, and Mo) was determined in the leaves in a month basis from April until November for apple, persimmon and peach. Mandarin mineral nutrition was monitored for one year, and grape and fig from May to November. Using this data, the Diagnosis Recommendation Integrated System (DRIS) was also calculated to evaluate the nutrient balance in the plants. The concentration of N and P had seasonal differences, especially in apple and peach, which reached the peak during the summer. Apple, fig, and grape trees had large ranging on their mineral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diagnosis Recommendation Integrated System; Fruit Crops; General Plant Nutrition; Nutrient balance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100212