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| Registros recuperados: 479 | |
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| CARGNIN, A.; SOUZA, M. A. de. |
| RESUMO: O objetivo deste trabalho foi estimar a diversidade genética das cultivares de arroz mais utilizadas em cultivo no período de 1950 a 2001. Foram conduzidos dois experimentos de campo, nas localidades denominadas Aeroporto e Agronomia, ambas pertencentes à Universidade Federal de Viçosa, em Viçosa, MG. Os experimentos foram conduzidos no delineamento de blocos ao acaso com três repetições. Avaliaram se as 25 cultivares mais plantadas no período de 1950 a 2001. Foram coletados e analisados os dados referentes a produção de grãos, altura das plantas, dias para a floração, estande inicial, estande final, perfilhamento útil, grãos por panícula, percentagem de espiguetas estéreis por panícula e peso médio de grão. As cultivares Guarani e Bico Ganga foram... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Arroz; Melhoramento Genético Vegetal; Oryza Sativa; Variedade.; Variação Genética; Genetic variation; Plant breeding; Rice; Varieties.. |
| Ano: 2007 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572282 |
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| Sandhu,S.S.; Colombo,Carlos; Bastos,Cândido R.; Siqueira,Walter J.. |
| Rice blast is the most important fungal disease of rice and is caused by Pyricularia oryzae Sacc. (Telomorph Magnoporthe grisea Barr.). Seven randomly amplified polymorphic DNA (RAPD) markers OPA5, OPG17, OPG18, OPG19, OPF9, OPF17 and OPF19 showed very clear polymorphism in resistant cultivar lines which differed from susceptible lines. By comparing different susceptible lines, nine DNA amplifications of seven primers (OPA5(1000), OPA5(1200,) OPG17(700), OPG18(850), OPG19(500), OPG19(600), OPF9(600), OPF17(1200) and OPF19(600)) were identified as dominant markers for the blast resistant gene in resistant cultivar lines. These loci facilitate the indirect scoring of blast resistant and blast susceptible genotypes. The codomine RAPDs markers will facilitate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rice; SCAR; Arbitrary primers; Pyricularia oryzae. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400011 |
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| Fabiosa, Jacinto F.; Jensen, Helen H.; Yan, Dong. |
| This study examines the impact of macroeconomic shocks on the efficiency of small farmers. We estimate single- and multiple-factor efficiency measures for Indonesian rice farmers in years before, during, and after the country's macroeconomic crisis. We find that productive efficiency declined by 7 to 22 percent during the crisis, largely because of a decline in technical efficiency and a relatively large volatility in efficiency (the coefficient of variation was larger by a factor of 1.87). Allocative efficiency, on the other hand, increased slightly and offset part of the decrease in technical efficiency. The magnitude of the impact on efficiency depended on farmers' input adjustments. Factors associated with higher levels of technical and allocative... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agriculture; Indonesia; Production efficiency; Rice; Crop Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/18346 |
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| Mekhora, Thamrong. |
| Shrimp production in Thailand has historically been undertaken in the saline and brackish waters of coastal mangroves. In recent years rising demand and prices for shrimp and falling productivity of mangrove areas have motivated an expansion of shrimp production into the fresh-water margins of river estuaries that were previously used for rice cultivation. Generalised additive models, which offer a comprehensive approach to regression analysis, are mainly used for empirical analysis, and model development and specification for rice and shrimp production in this study. This paper presents a brief introduction to generalised additive models, discusses how they are applied to develop cost functions to satisfy the restriction of production theory, and... |
| Tipo: Presentation |
Palavras-chave: Rice; Shrimp; Returns to scale.; Agribusiness; Environmental Economics and Policy. |
| Ano: 1999 |
URL: http://purl.umn.edu/124086 |
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| Singh, Rajinder Pal; Brennan, John P.; Farrell, Tim; Williams, Robert L.; Rienke, Russell; Lewin, Laurie; Mullen, John D.. |
| The occurrence of low night temperatures during reproductive development is one of the factors most limiting rice yields in southern Australia. Yield losses due to cold temperature are the result of incomplete pollen formation and subsequent floret sterility. Researchers have found that in 75% of years, rice farmers suffer losses between 0.5 and 2.5 t/ha. Research is being undertaken to identify overseas rice varieties, that are cold tolerant under the local weather conditions and by using those genotypes as parent material, develop cold tolerance varieties of rice. A yield simulation model was used to measure reduction in losses due to cold at different minimum threshold temperatures, while the SAMBOY Rice model was used to measure the costs and returns... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Rice; Cold; Yield loss; Breeding; Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/57925 |
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| Ramires,Maiara Figueiredo; Souza,Eduardo Lorensi de; Fontanive,Daniel Erison; Bianchetto,Renan; Krynski,Ângelo Munaretto; Cezimbra,Júlio Cesar Grasel; Antoniolli,Zaida Inês. |
| ABSTRACT Pork is the most consumed animal protein around the world. The production levels are significant, which results in the generation of large amounts of slaughter waste. Such waste is often disposed of improperly in agricultural areas, causing environmental imbalance by the contamination of soil and water sources with metals and pathogenic organisms. This study evaluates the phytotoxic effects of pig slaughterhouse waste in natura and after stabilization processes on lettuce (Lactuca sativa Linnaeus, 1753), radish (Raphanus sativus Linnaeus, 1753), and rice (Oryza sativa Linnaeus, 1753), in addition to shoot nutrient contents. To do this, the waste was evaluated through phytotoxicity tests on lettuce, radish, and rice plants in natura (PSWin) as well... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pig farming; Phytotoxicity; Lettuce; Radish; Rice. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100521 |
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| AZEVEDO, D. M. P. de; COSTA, N. de L.; FERREIRA, R. de P.. |
| Procurou-se determinar periodo critico de competicao entre plantas daninhas e cultura do arroz de sequeiro nas condições edafoclimáticas do município de Ouro Preto D'Oeste-RO. Utilizou-se arroz IAC-164, semeada em linhas espacadas de 0,5cm, sendo distribuidas 50 sementes/m linear. Delineamento experimental foi em blocos casualizados com quatro repeticoes. Cada parcela teve uma area de 15cm2(3,0 x 5,0m), com uma area util de 8,0m2 (2,0 x 4,0m). Foram avaliados os sequintes tratamentos: cultura linha de plantas daninhas ate 10,20,40,50 e 60 dias apos a emergencia e durante todo o ciclo; e com plantas daninhas ate 10,20,30,40,50 e 60 dias apos a emergencia e durante todo o ciclo. Concluiu-se que o periodo maximo permitido a presenca de invasoras na area... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Embrapa Rondônia; Ouro Preto D'oeste (RO); Rondônia; Amazônia Ocidental; Western Amazon.; Arroz Sequeiro; Oryza Sativa; Erva Daninha; Rendimento; Campo Experimental.; Competição Biológica; Rice; Dryland farming; Rice; Plant competition; Crop yield.. |
| Ano: 1988 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/698024 |
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| Najafi, Bahaeddin; Bakhshoodeh, Mohamad. |
| To evaluate the government intervention effects on growth of rice production in Iran, the nominal protective rate was calculated and a Nerlove supply model was applied to a time series of 1983-1998. The results showed that in the majority of these years, producers has not been supported and therefore, redirecting the rice market is recommended. In order to get more efficient approach than the government intervention, diminishing the share of the government in the market and strengthening the private sector may be listed on the top of a list that could be regarded as a plan for making rice production profitable. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Nominal protection rate; Rice; Iran; Agricultural and Food Policy. |
| Ano: 2002 |
URL: http://purl.umn.edu/24922 |
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| Javaid,Arshad. |
| This pot study investigated the effect of the combined application of two commercial biofertilizers viz. Biopower and EM (Effective Microorganisms) on rice (Oryza sativa L.) growth and yield in soils amended with farmyard manure, green manure, and NPK fertilizers. Biopower is a product of the Nuclear Institute for Biotechnology and Genetic Engineering (NIBGE), Pakistan, which contains species of associative and endophytic diazotrophs. EM (effective microorganisms), a product developed by Japanese scientists, consists of co-existing beneficial microorganisms, mainly species of photosynthetic and lactic acid bacteria, as well as yeast. Applying Biopower adversely affected plant growth and yield in NPK fertilizer amendment. Conversely, this biofertilizer... |
| Tipo: Journal article |
Palavras-chave: Associated N2-fixers; Biopower; Effective microorganisms; Rice; Soil amendments. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100019 |
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| Abbasian,Abouzar; Mirshekari,Bahram; Safarzade Vishekaei,Mohammad N; Rashidi,Varahram; Aminpanah,Hashem. |
| Effects of the foliar application of methanol on the yield and growth of rice (Oryza sativa cv. Shiroudi). Cien. Inv. Agr. 43(1):17-24. Approximately two decades have passed since it was reported that the foliar application of methanol increased plant biomass and yield. Many subsequent reports have been published concerning the ability or inability to reproduce these initial observations. To evaluate the effect of methanol on rice (Oryza sativa cv. Shiroudi) yield and rice components, a field experiment was conducted at the Tonekabon Rice Research Station in Iran in 2012 and 2013. The experiment had a randomized complete block design (RCBD) with three replicates. The plants were treated with aqueous methanol solutions (0, 6, 12, 18, and 24% (v/v)).... |
| Tipo: Journal article |
Palavras-chave: Aqueous methanol solution; Correlation; Glycine; Grain yield; Growth; Rice; Tween 80 as a surfactant. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100002 |
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| FAZOLIN, M.. |
| No Brasil, as perdas de grãos durante o armazenamento têm atingido níveis médios de 20%. No Acre, devido as precárias condições de armazenamento e os fatores climáticos favoráveis ao desenvolvimento das pragas, os níveis de perdas são superiores a 30%. Os insetos têm sido os agentes responsáveis por essas perdas, causando prejuízos quantitativos determinados pela perda de peso e prejuízos qualitativos causados pela depreciação do produto devido a presença de ovos, larvas, pupas, adultos e alterações na composição química do produto, além de facilitar o desenvolvimento de micro-organismos. Nas condições locais, 35% do arroz armazenado é atacado pelo gorgulho (Sitophilus zeamais) e 65% pela traça (Sitotroga cereealella). No controle dessas pragas alguns... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Maize weevil; Angoumois grain moth; Embrapa Acre; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Oriza sativa; Plagas de plantas; Control químico; Malatión; Plaguicidas.; Arroz; Praga de planta; Gorgulho dos cereais; Sitophilus zeamais; Traça dos cereais; Sitotroga cerealella; Controle químico; Inseticida; Campo Experimental.; Rice; Plant pests; Chemical control; Pesticides; Malathion.. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492345 |
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| Registros recuperados: 479 | |
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