Consulta: subjectFacets:"Flooded rice"
Registros recuperados: 6
Data/hora: 02/06/2024 00:46:31

SISTEMAS de produção para arroz em várzeas: municípios de Bragança, Augusto Correa e Viseu (revisados).
Provedor de dados: 14
bitstream/item/48699/1/arroz-em-varzeas.pdf
Tipo: Sistema de Produção (INFOTECA-E)
Palavras-chave: Arroz de varzea; Caete; Braganca; Pará; Brasil; Flooded rice; Production; Cultural methods.; Pratica Cultural; Sistema de Produção.; Amazonia.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/907770

Chemical and biological attributes of a lowland soil affected by land leveling
Provedor de dados: 86
Autores: Parfitt,José Maria Barbat; Timm,Luís Carlos; Reichardt,Klaus; Pinto,Luiz Fernando Spinelli; Pauletto,Eloy Antonio; Castilhos,Danilo Dufech.
The objective of this work was to evaluate the relationship between soil chemical and biological attributes and the magnitude of cuts and fills after the land leveling process of a lowland soil. Soil samples were collected from the 0 - 0.20 m layer, before and after leveling, on a 100 point grid established in the experimental area, to evaluate chemical attributes and soil microbial biomass carbon (MBC). Leveling operations altered the magnitude of soil chemical and biological attributes. Values of Ca, Mg, S, cation exchange capacity, Mn, P, Zn, and soil organic matter (SOM) decreased in the soil profile, whereas Al, K, and MBC increased after leveling. Land leveling decreased in 20% SOM average content in the 0 - 0.20 m layer. The great majority of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooded rice; Soil biological attributes; Soil chemical attributes; Soil management; Soil movement.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001100010

Soil CH4 and N2O Emissions from Rice Paddy Fields in Southern Brazil as Affected by Crop Management Levels: a Three-Year Field Study
Provedor de dados: 90
Autores: Zschornack,Tiago; Rosa,Carla Machado da; Reis,Cecília Estima Sacramento dos; Pedroso,Gabriel Munhoz; Camargo,Estefânia Silva; Santos,Daiane Carvalho dos; Boeni,Madalena; Bayer,Cimélio.
ABSTRACT Rice yield increases in response to improvements in crop management, but the impact on greenhouse gas (GHG) emissions in the subtropical region of Southern Brazil remains unknown. A three-year field study was developed aiming to evaluate the impact that an increase in crop management levels (high and very high) has on soil methane (CH4) and nitrous oxide (N2O) emissions, as compared to the level (medium) currently adopted by farmers in Southern Brazil. Differences in crop management included seed and fertilizer rates, irrigation, and pesticide use. The effect of crop management levels on the annual partial global warming potential (pGWP = CH4 × 25 + N2O × 298) ranged from 7,547 to 17,711 kg CO2eq ha−1 and this effect was larger than on the rice...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entisols; Flooded rice; Greenhouse gases; Methane; Yield-scaled.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100516

Mitigation of methane and nitrous oxide emissions from flood-irrigated rice by no incorporation of winter crop residues into the soil
Provedor de dados: 90
Autores: Zschornack,Tiago; Bayer,Cimélio; Zanatta,Josiléia Acordi; Vieira,Frederico Costa Beber; Anghinoni,Ibanor.
Winter cover crops are sources of C and N in flooded rice production systems, but very little is known about the effect of crop residue management and quality on soil methane (CH4) and nitrous oxide (N2O) emissions. This study was conducted in pots in a greenhouse to evaluate the influence of crop residue management (incorporated into the soil or left on the soil surface) and the type of cover-crop residues (ryegrass and serradella) on CH4 and N2O emissions from a flooded Albaqualf soil cultivated with rice (Oryza sativa L.). The closed chamber technique was used for air sampling and the CH4 and N2O concentrations were analyzed by gas chromatography. Soil solution was sampled at two soil depths (2 and 20 cm), simultaneously to air sampling, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gases; Flooded rice; Soil management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200031

Methane emission from a flooded rice field under pre-germinated system
Provedor de dados: 65
Autores: Lima,Magda Aparecida de; Vieira,Rosana Faria; Frighetto,Rosa Toyoko Shiraishi; Luiz,Alfredo José Barreto; Villela,Omar Vieira.
ABSTRACT:  Local greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembé, State of São Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.51 kg CH4 ha-1 dia-1), the partial global warming potential (pGWP, 27.2 Mg CO2eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2eq kg-1 grain).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooded rice; Pre-germinated system; Methane.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001100201

Diurnal variation of methane emission from a paddy field in Brazilian Southeast
Provedor de dados: 65
Autores: Lima,Magda Aparecida de; Pazianotto,Ricardo Antonio Almeida; Villela,Omar Vieira; Paraíba,Lourival Costa.
ABSTRACT: This study aimed to investigate the diurnal variation of methane (CH4) emission in a flooded-irrigated rice field at different stages of the plant development under tropical climate in three growing seasons, in order to determine the most appropriate time for gas sampling in the Brazilian Southeast region. It aimed also to verify correlations between CH4 flux and air, water and soil temperatures, and solar radiation. The CH4 emissions were measured every 3-hour interval on specific days in different development stages of the flooded rice in the Experiment Station of the Agência Paulista de Tecnologia dos Agronegócios (APTA), Pólo Regional Vale do Paraíba, at Pindamonhangaba, State of São Paulo (22°55’ S, 45°30’ W), Brazil. Different CH4 emission...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooded rice; Methane flux; Plant development stage; Activation energy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400251