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Controlo de Infestantes em pós-emergência em trigo de sementeira directa

Barros, José
Fonte: Universidade de Évora - Departamento de Fitotecnia Publicador: Universidade de Évora - Departamento de Fitotecnia
Tipo: Livro Formato: 1774080 bytes; application/msword
ENG
Relevância na Pesquisa
26.75%
Sendo a produção vegetal fundamental para a sobrevivência humana, há que minimizar os prejuízos elevados a que é frequentemente sujeita, causados por doenças, pragas e infestantes. Não obstante os diversos meios de luta disponíveis, o agricultor vê-se na maioria das vezes, forçado a realizar tratamentos fitossanitários de modo a reduzir esses prejuízos. As infestantes são na actualidade, um dos principais, senão o principal inimigo das plantas cultivadas, principalmente as infestantes anuais, consequência do seu elevado poder de propagação, podendo em algumas espécies, uma só planta produzir milhares de sementes, com grande parte dessas a serem duras, podendo passar vários anos no solo e germinar quando as condições lhes forem favoráveis. Por outro lado, estas infestantes são facilmente disseminadas pelo vento, águas de escorrimento e pelos próprios animais que as ingerem e transportam, indo por vezes germinar a grandes distâncias dos locais onde foram produzidas. Para controlar infestantes, o agricultor dispõe de meios mecânicos e químicos. Enquanto em determinadas situações utilizar uns ou outros poderá ser apenas uma questão de opção, em pós-emergência de cereais de Outono/Inverno, apenas a opção química é possível...

Pulverizadores e Aplicação de Herbicidas

Barros, José
Fonte: Universidade de Évora - Departamento de Fitotecnia Publicador: Universidade de Évora - Departamento de Fitotecnia
Tipo: Livro Formato: 96997888 bytes; application/msword
ENG
Relevância na Pesquisa
26.75%
A produção vegetal, desde sempre indispensável ao homem, é frequentemente sujeita a prejuízos elevados, originados por infestantes, pragas e doenças. Por este motivo, o agricultor vê-se na obrigação de realizar tratamentos fitossanitários devendo, no entanto, ter em mente que se podem utilizar diversos meios de luta hoje disponíveis, tais como: a luta biológica, meios de combate físicos e meios de combate químicos. Os tratamentos fitossanitários são trabalhos de precisão, tendo como objectivos proporcionar à cultura as melhores condições para o seu crescimento através do combate de infestantes, insectos, fungos, ácaros, etc. e ainda, assegurar um óptimo efeito com o mínimo de risco para a cultura, pessoas e meio ambiente. As infestantes são actualmente, um dos principais, se não o principal inimigo das plantas cultivadas, pois como se sabe, grande parte daquelas têm elevado poder de propagação, podendo em algumas espécies, uma só planta produzir milhares de sementes. Dessas, grande percentagem são duras, podendo passar vários anos no solo e germinar quando as condições lhes sejam favoráveis. Por outro lado, são facilmente disseminadas pelo vento, águas de escorrimento e pelos próprios animais que as ingerem e transportam...

Integrando esforços para o desenvolvimento da Amazônia.

SEMINÁRIO DE PÓS-GRADUAÇÃO NA EMBRAPA AMAZÔNIA OCIDENTAL, 2008, Manaus.
Fonte: Manaus: Embrapa Amazônia Ocidental, 2008. Publicador: Manaus: Embrapa Amazônia Ocidental, 2008.
Tipo: Outras publicações científicas (ALICE) Formato: 124 p.
PT_BR
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Ecotoxicologia. Avaliação dos Efeitos Causados ao Solo pela Presença de hidrocarbonetos de petróleo. Toxicidade Aguda e Rejeiçao do Fungicida Oxicloreto de Cobre para Eisenia fetida e Pontoscolex corethrurus (Oligochaeta). Fitotecnia. Comportamento e Controle do Tripes do Guaranazeiro, Liothrips adisi (Thysanoptera: Phlaeothripidae). Germinação de Sementes do Gênero Elaeis sp. sob Diferentes Substratos em Luz e Escuro. Incidência e Controle de Fungos em Sementes de Dendezeiro (Elaeis guineensis Jacq.) com Diferentes Fungicidas. Influência de Espaçamentos e Épocas de Corte na Produção de Biomassa e Teor de Óleo Essencial de Pimenta-de-Macaco (Piper aduncum L.), nas Condições de Manaus - AM. Sistema de Produção de Tomate em Substrato para Agricultura Familiar na Região Metropolitana de Manaus. Melhoramento. Repetibilidade da Produção de Cachos, Anomalias Florais e Germinação de Pólen de Híbridos Interespecíficos entre o Caiaué e o Dendezeiro. Sistema Reprodutivo do Tucumã-do-Amazonas (Astrocaryum aculeatum, Meyer).Piscicultura. Avaliação da Potencialidade do Uso do Alho e do Cipó-Alho no Cultivo do Tambaqui. Comparação da Sensibilidade de Metil paration entre Peixes da Amazônia e Espécies da Região Temperada. Transporte de Juvenis de Matrinxã (Brycon Amazonicus): Uso da Zeolita e do Eugenol para Minimizar o Estresse. Solos. Caracterização Morfológica de Alguns Perfis na Província Petrolífera de Urucu...

Rootstock performance and bud development evaluation to optimize Vitis vinifera production

Dias, Frederico Alcântara Novelli
Fonte: Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 21/08/2015 ENG
Relevância na Pesquisa
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Wine grapes are constrained to a narrow climatic range and consequently are especially sensitive to climate change, with potential effects on yield, quality and profitability. Researches to increase knowledge about reproductive development and new agriculture practices, and opening of new wine making areas are important to overcome climates limitations. In Brazilian southeast, a new management approach called double pruning allows the change of wine grape harvest season from wet summer to dry winter. Thus, the present thesis had as issue evaluation of different rootstocks on grapevine Syrah performance and wine quality in Brazilian southeast; and the validation of a new grapevine model, called Microvine, to winter bud development studies. A competition of ten rootstocks under Syrah was developed during two seasons in south of Minas Gerais state, Brazil. Rupestris du Lot and IAC 766 induced the highest pruning weight, while R110 and 161-49C showed the lowest vegetative development. The average yield per plant of two seasons identified Rupestris du Lot, IAC 766, 1045P and Kober 5BB as the most productive rootstocks. The more vigorous rootstocks did not affect negatively grape quality of Syrah under double pruning management. Syrah’ wine from productivity and vigorous rootstocks...

Aduba????o nitrogenada na produ????o de biomassa e sementes de azev??m em rota????o com soja; Biomass production of the nitrogen fertilization and ryegrass seeds in rotation of the soybean crop

BOHN, Alberto
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
26.75%
The experiment was conducted at the Experimental Station of Embrapa Clima Temperado/Lowlands and Seed Analysis Laboratory of the Department of Plant Science, UFPel. Different densities in the soil seeds (T1 - 777.70 kg.ha-1; T2 - 736.63 kg.ha-1; T3 - 624.59 kg.ha-1 and T4 - 234.42 kg.ha-1) were tested in annual ryegrass (Lolium multiflorum Lam.) in succession to soybean crop. Forage harvesting has occurred twice and after the second defoliation, were tested different levels of urea (null; 45; 90 and 135 kg.ha-1). The highest densities produced more rapid crop establishment and greater mass of harvested forage, both at first and in the second cut. In this sense, from the application of different doses of urea was found, only significant effect of nitrogen on seed yield, so the addition of a unit of urea increased by 1.7 units seeds. Occurred relationship between levels of SPAD when the assessment was conducted before flowering. Prior to harvest seed regression models between SPAD and urea levels were not significant. The seed physiologic quality was not affected by the levels of in the soil seeds and urea.; O experimento foi conduzido na Esta????o Experimental da Embrapa Clima Temperado/Terras Baixas e no Laborat??rio de An??lises de Sementes do departamento de Fitotecnia da Universidade Federal de Pelotas - UFPel. Foram avaliadas diferentes densidades de sementes no solo (T1 - 777...

Comportamento de plantas de arroz h??brido em fun????o da qualidade fisiol??gica das sementes; Hybrid rice plants behavior regarding the seeds physiological quality

MIELEZRSKI, Fabio
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
26.75%
The work had the objective of evaluating the behavior of populations of hybrid rice plants which were cultivated isolated, and the individual behavior and plants originated from seeds of high and low vigor of hybrid rice, inside of populations that were constituted of different combinations of seed line distributions. The experiment was conducted in the didactic experimental area of the agronomy school. It was used seeds of hybrid rice of the cultivar Avaxi, which belongs to the Ricetec??, including two types characterized as low and high vigor. Two studies were conducted. On the first, the effect of seed vigor on isolated plants, cultivated in hollows of 50 cm of depth, was evaluated. Two treatments were tested; plants originated from low and high vigor seeds, being each parcel composed by only one plant. On the second study, the evaluation was on the individual behavior of plants inside a population, as long as the entire population behavior established with different systems of distribution of plants originated from high and low vigor seeds, on the seed line. The experiment had 5 different combinations of seed line distribution of the plants originated from high and low vigor seeds, in seed lines of 4 meters of length. The plants were obtained by sowing each lot in distinct treys with soil as subtract...

Desempenho de gen??tipos de arroz irrigado quanto ao frio na germina????o e na emerg??ncia; Germination and emergence performance of irrigated rice genotypes under cool temperature

FREITAS, Dem??crito Amorim Chiesa
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
26.75%
The need to widen the seeding window of irrigated rice cultivars capable of germinating and producing normal seedlings under low soil temperatures led to the execution of this work, at the laboratory of the Plant Science Department from the Faculty of Agronomy Eliseu Maciel , Federal University of Pelotas and greenhouses at Embrapa s Temperate Climate (CPACT - Pelotas/RS) and Rice & Bean (CNPAF - Goi??nia/GO) Experimental Stations. The experimental work focused on the identification of irrigated rice genotypes from an F2 generation tolerant to low soil temperatures at the germination and emergence stages, through the selection of cDNA fragments differentially expressed as the result to low temperature exposure during the germination phase. The procedure consisted of three stages; First stage involved selection, through physiological traits associated to genotype tolerance and sensitivity to germination onset and emergence under low temperature, among the 104 genotypes tested. The Second stage focused on the screening for variability for low temperature tolerance trait among the F2 progeny of a dialellic set of crossings, while the Third stage related to differentially expressed cDNA fragment selection, among embryos from low temperature tolerant and sensitive genotypes. Main results are as follows; a) A large variability for traits expressing tolerance to germination and emergence under low temperatures was determined among the genotypes tested...

Vigor de sementes e desempenho de campo de arroz h??brido; Hybrid rice seed vigor and culture performance

NEVES, M??rcio Blanco das
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
26.75%
The aim of this study was to evaluate the effect of seed vigor on hybrid rice plant performance, grown in communities consisting of different combinations of plants originated from different vigor levels seeds along the line of seeding, individually or in arrangements of plants. Two experiments were conducted at the Experimental and Didactic Plant Science Department, Faculty of Agronomy "Eliseu Maciel . Two batches of hybrid rice seed from the RiceTec Company, Avaxi CL ??, characterized as high and low vigor were used for this aim. The first experiment evaluated the effect of seed vigor on the behavior of individually analyzed plants grown at different population densities. It was tested three different arrangements of plants: exclusive plants from high vigor seeds, exclusive plants from low vigor seeds, and half plants from high vigor seeds interspersed with half of plants from low vigor seeds. The arrangements were distributed in two densities: 125 plants per square meter and 63 plants per square meter. In the second study, the rice plants had their behavior evaluated individually within the community, and also, the general behavior of the community, formed by arrangements of plants from high and low vigor seeds in accordance the ratio of 100:0...

Condutividade el??trica em diferentes partes de sementes de soja; Electrical conductivity inin different parts of soybean seeds

CUNHA, Cristina dos Santos Madruga
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
27%
Among the rapid tests, the electrical conductivity has been used for the evaluation of seed vigor, since the process of deterioration of the initial events is the loss of membrane integrity. The objective was to evaluate the efficiency of electrical conductivity mass and individual, driven to different parts of soybean seeds (whole seed, cotyledons and embryonic axes) and verify the possibility of obtaining results in less than 24 hours. The electrical conductivity and mass were conducted in individual laboratories Didactic Analysis of Seed Plant Science Department, Faculty of Agronomy "Eliseu Maciel (UFPel) and Universidade Federal de Santa Maria (UFSM), respectively. We used seeds of two cultivars, each represented by six lots. The physiological seed quality was evaluated by standard germination, first count germination, seedling vigor classification, accelerated aging, a field emergence and electrical conductivity. To conduct the electrical conductivity mass of the different structures of the seed, there were four replicates of each batch, with 10 whole seeds, embryonic axes 10 and 10 pairs of cotyledons submerged in 25mL of distilled and deionized water for the following periods: 1, 2 , 3, 4, 5, 6, 7, 8 and 24 hours. As the system mass...

Vigor de sementes de soja e desempenho da cultura; Soybean seeds vigor and yield performance

SILVA, Clarissa Santos da
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-gradua????o em Ci??ncia e Tecnologia de Sementes; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
26.75%
This work aimed to evaluate soybean seeds cultivated isolated and communities of different arrangements from seeds of high and low vigor, in different population of plants. The experiment was conducted at the ??rea experimental e Did??tica da Faculdade de Agronomia Eliseu Maciel using two lots of BRS243 soybean cultivar of different quality. On the first work it was evaluated the effect of seeds vigor on isolated plants, cultivated in hollows of 50 cm of spacing. Two treatments were tested: plant from seeds of high and low vigor, being each parcel composed by one plant. The second one evaluated the individual behavior inside the communities, as well as the entire community behavior in different systems of plants distribution originated from high and low vigor seeds, along the sowing line in different populations. The treatments constituted three arrangements of seeds distribution of high and low vigor along the line sowing and four population of plants (150.000, 300.000, 450.000 e 600.000 plants per hectare). The two treatments were obtained from seed lots with 90% of germination and 81% of accelerated aging, considered high physiological quality, and another one with 79% of germination and 68% of accelerated aging, considered low physiological quality. Soybean plants originated from high vigor seeds present high performance than plants from low vigor seeds...

Disponibilidade hídrica no crescimento, acúmulo e composição química do óleo essencial de Mentha piperita e estudo comparativo de atividades antioxidantes em espécies de mentas; Water availability on growth, accumulation and chemical composition of Mentha piperita essential oil and comparative study of antioxidants activities in mint species

Lordêllo, Diogo Mendes da Silva
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Dissertação
Publicado em 23/09/2015 POR
Relevância na Pesquisa
26.75%
In the first article aimed to evaluate the vegetative growth of M. piperita grown under different water availability, as well as its influence on the chemical composition accumulation and antioxidant activity in vitro of the essential oil were 4 treatments: (T1) 100-85% capacity field (CC); (T2) 80-65% DC; (T3) 60-45% of C; (T4) 40-25% of CC with 5 blocks. The plants were maintained for 30 days in DC and under treatment for 40 days. Evaluated the vegetative growth beyond the essential oil from the leaves which was extracted by hydrodistillation, analyzed by GC-FID and GC-MS and quantified its antioxidant potential. At the 40% level of DC there was a significant reduction in the MSF input MSC 31% and 15.6%, also changing the chemical composition of the essential oil. The level of 40% moisture was elevated total antioxidant capacity and 80% increase of the chelating power of the oils. In the second article aimed to quantify the total phenolics and compare the antioxidant potential in vitro aqueous and hydroalcoholic of M. piperita, M. villosa and M. rotundifolia. The aqueous extracts were prepared under reflux for 60 minutes at a concentration of 5%. The hydroalcoholic extracts were prepared by sonication in 70% ethanol for 30 min at 5% concentration. The quantification of total phenolics...

Adubação com potássio nas características agronômicas e na qualidade de sementes de soja

Ferreira, Valquíria de Fátima
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 30/09/2015 POR
Relevância na Pesquisa
26.75%
The availability of nutrients for plants producing seeds may influence the production and quality, different responses and effects of potassium fertilization in the development of the culture were found. Thus, this study aimed to determine the effects of potassium fertilization in the groove, thrown on top of the soil, onto soil cover in the soybean crop establishment and its consequence in the production process and seed quality. To conduct the study, four soybean cultivars of Syngenta were used, 1379 IPRO SYN, SYN 1263 RR, SYN 1279 RR and a noncommercial cultivar (NC IPRO). It was conducted two trials, one in greenhouse in Lavras - MG, and the other one in a field in Lucas do Rio Verde - MT. Different types of potassium fertilization were used under greenhouse conditions: 1 - Recommended dosage in the groove, 2 - Twice the recommended dosage in the groove, 3 - Recommended dosage for fertilizer thrown on top of soil 4 - Recommended dosage for coverage, 5 – Control without potassium fertilizer. In the experiment in the field beyond the fertilization done in the greenhouse was also used the double of the dose thrown on top of the soil and the double of recommended dose for potassium in coverage. The study in greenhouse was conducted in a completely randomized design in a factorial 4x5 (cultivars x potassium fertilization methods) with three replications. In the field the factorial design was randomized blocks in a factorial 4x7 (cultivars x potassium fertilization methods) with 4 replications. Evaluations of plant height...

Conteúdo de DNA, número cromossômico e alguns compostos de interesse nutricional em Amaranthus spp; DNA content, chromosomal number and some interesting compounds in nutricion

Samartini, Carolina Queiroz
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Dissertação
Publicado em 19/10/2015 POR
Relevância na Pesquisa
26.75%
The Amaranthaceae family consists of 170 genera and, within the family there the Amaranthus genus that is made up of 60 species. In Brazil the species is widely known as pigweed and there are the least 10 of this species. Despite researches show the benefits of these specie for human consumption, their consumption is very little and is seen as plant weed. The objective of this study was to determine the chromosome number, nuclear DNA content, as well as post-harvest characterization of Amaranthus species. In this research were used five species of the genus collected from the germplasm collection of unconventional vegetables at the Universidade Federal de Lavras (UFLA), MG, Brazil. The metaphase chromosomes were obtained by technique of drying on flame and dyed with 2 % Giemsa. The nuclear DNA content was estimated by the flow cytometry using LB01 and Pisum sativum buffer as standard. In order to accomplish the objectives were carried out the following postharvest analyses: antioxidant activity (DPPH and ABTS), phenolic compounds, vitamin C, total soluble solids, pH, moisture, colour (L *, a *, b *, Chroma, °Hue), lipids and proteins. The number of chromosome varied from 2n = 32 (A. hybridus) and 2n = 34 (A. spinosus...

Técnicas de agricultura de precisão para avaliação da variabilidade de solo e do cafeeiro em pequenas propriedades do Sul de Minas Gerais

Melo, Bruno Manoel Rezende de
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Dissertação
Publicado em 23/10/2015 POR
Relevância na Pesquisa
26.75%
Coffee growing has relevance regarding to agricultural production in Minas Gerais state. Southern of Minas Gerais produces 50% of all state coffee, being present in small and large farms, but there is less productivity by small producers when compared to corporate farmers. This low productivity is often associated to low access to technologies. In this scenario, an alternative to the reality is adequate availability of technology that meets this producers’ class. In this context the use soil sampling grids has the potential to be introduced in small farms in order to optimize the use of resources, since the conventional soil sampling process does not characterize the existing variability, so the use of inputs is done through the medium contents from the conventional sampling procedure. The objective was to assess the economic and agronomic feasibility of using precision agriculture techniques on fertilizers recommendation with different sampling grids compared to the traditional model soil sampling in coffee growing of small farms and the definition of homogeneous management zones according to chemical variables of soil and productivity. The experiment was conducted in the city of Inconfidentes - MG, on the Farm Escola property, where soil sampling grids were used with 52...

Produção de alho-semente e degenerescência em material propagativo livre de vírus

Pedrosa, Carlos Enrrik
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 23/10/2015 POR
Relevância na Pesquisa
26.75%
Garlic (Allium sativum L.) is a bulbous vegetable with many uses in food due its flavor and aroma, also featuring medicinal properties scientifically recognized. However faces problems related to the viral complex that accumulates over the years of production at field, causing the degeneration of culture. The objective of this study was to evaluate the productivity and quality of free garlic virus in years and different environmental conditions. In both experiments was performed a randomized block design with Ito cultivars, Purple Pearl Hunter, Jonas, Chonan and Quitéria. In the first experiment was conducted evaluation in the field and greenhouse anti aphids aimed at producing seed garlic, in the second experiment, the cultivars were evaluated for two consecutive years under field conditions. In both environments all cultivars showed high total productivity bulbs and Ito, Jonas and Caçador showed higher business productivity to 90% of overall productivity. The overgrowth of the cultivars in the greenhouse was controlled by a higher temperature and irrigation more efficient. All cultivars have better features in the greenhouse, but there was satisfactory productive characteristics of garlic-plant in the first year in the field. Considering the two years of production...

Ácido cítrico via solo e seus efeitos na nutrição do cafeeiro; Citric acid via soil and its effects on nutrition coffee

Lemos, Vinícius Teixeira
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 17/11/2015 POR
Relevância na Pesquisa
26.75%
Exogenous use of low molecular weight organic acids has been very recently tested in agriculture. However, studies conducted to test the effect of these acids, especially citric acid, by means of nutritional analysis in plants and chemical attributes of soil, are of fundamental importance. The objective in this study was to evaluate productivity, chemical attributes of soil, nutritional status, and sufficiency range of nutrients in coffee (Coffea arabica), during four harvesting seasons, subjected to the application of citric acid (CA) in two regions of Minas Gerais (MG), Brazil. The experiments were conducted at private farms. One in Diamantina (MG), in Yellow Argisol dystrophic (YAd), and another in Campos Altos (MG), in Red Oxisol dystrophic (ROd). In both cultivation locations, we used Coffea arabica, cultivar Catuaí Vermelho IAC-99, with ages of four and six years, and one plant per pit in spacings of 4.0 x 0.80 m and 4.0 x 0.75, respectively. The experimental design used was of randomized blocks design, with four blocks and two replicates per block. The treatments were comprised of four doses of CA (0, 1, 2 and 4 kg ha-1 ), in single application via watering can, under the projection of the plant shoot, in December of 2008, 2009...

Seleção de progênies F4 de cafeeiros com resistência à ferrugem em Machado-MG

Cardoso, Diego de Abreu
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Dissertação
Publicado em 25/11/2015 POR
Relevância na Pesquisa
26.75%
In this study we aimed to evaluate and select coffee progenies at F4 generation, under field conditions, in order to obtain rust resistant cultivars, cercospora leaf spot resistant and agronomic characteristics superior to traditional cultivars. We evaluated 33 progenies developed by the Genetic Improvement Program of Coffee in Minas Gerais, coordinated by EPAMIG, obtained from a cross among the cultivars Icatu group with Catuaí Amarelo IAC 62 and IAC 17 and the progenies IAC 5002 and IAC 5010, with three more susceptible controls cultivars. The experimental design used was a randomized block with four replications with ten plants per plot and spacing of 3.0 m and 0.80 m between the lines and between plants, respectively. The experiment was installed in 2007 on Experimental Farm EPAMIG in Machado - Minas Gerais. The following characteristics were analyzed: production (bags.ha-1), percentage of grains retained in sieve "17 and up" and vegetative vigor during the years 2010, 2011, 2012 and 2013; incidence and severity of rust and cercospora leaf spot incidence were evaluated in 2013. Based on the results obtained, it can be seen that the progenies have variability for the analyzed characteristics. We conclude that the H 141-17-46 progenies Cova 8...

Efeito do estresse na composição química de microalgas e do extrato na germinação de sementes de alface

Ambrosano, Lucas
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 27/11/2015 POR
Relevância na Pesquisa
26.75%
Microalgae are a group of aquatic organisms that might have great potential for cultivation due to the high growth rate. Many species are grown commercially in several countries and the produced biomass has been used as a source in the food industry, in the production of natural dyes, as a source of lipids in the production of biofuels (bioethanol and biodiesel) and in the production of bioproducts for using in plant cultivation. An economically viable way of producing microalgae can be using wastewater as culture medium. The present work aimed to evaluate the effect of stress on biochemical variation of microalgal biomass grown in wastewater and, study the potential of extracts produced by microalgal biomass in the lettuce seed germination. Three microalgae, Chlorella vulgaris (Cv), Scenedesmus obliquus (Sc) and a Consortium (Cons C) of isolated microalgae extracted of urban effluent of Figueira da Foz / Portugal, were used. The microalgae were grown under normal conditions. Thereafter, to stress the microalgae, they were placed in solution without nutrients. The biochemical characterization of biomass was made through analysis of the volatile solids, total solids, moisture, ash, protein, sugar, oil and total pigments. Later, aqueous and methanolic extracts in three concentrations (2...

Controle genético e expressão de genes associados à qualidade fisiológica de sementes de milho

Andrade, Thaís de
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Tese de Doutorado
Publicado em 27/11/2015 POR
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The demand for maize hybrid seeds with high quality is increasing in Brazil, mainly due to the adoption of advanced technologies by growers. It is known that physiological quality of maize seeds is influenced by genotype, becoming an important trait to be evaluated during the selection process in breeding programs. Several genes seem to be involved in the control of this trait, and those which encode the α-amylase enzymes are described as having the greatest influence on the physiological quality of maize seeds. However, recent researches has been observed that other genes may be associated with seed quality. Thus, the aim in this study was to evaluate the genetic control and the expression of genes associated with maize seed quality. For this purpose, a field was installed to obtain hybrid, reciprocal and inbred line seeds using partial dialel design. Five lines were used (30, 91, 57, 43, 64). The physiological quality of the seeds were accessed by water content, germination, first count of germination, germination speed index, cold test, accelerated aging and controlled deterioration. The heterosis effect, the general (GCA) and the specific (SCA) combining ability and the reciprocal effects were estimated. Proteomic analysis was performed for LEA proteins...

Influência espectral de telas de sombreamento na pós-colheita de alpínias

Maia, Mariane Oliveira
Fonte: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura Publicador: Universidade Federal de Lavras; Programa de Pós-Graduação em Agronomia/Fitotecnia; UFLA; brasil; Departamento de Agricultura
Tipo: Dissertação
Publicado em 07/12/2015 POR
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The manipulation of the intensity and spectral quality of the solar radiation in plant growing is done by using neutral or color shading nets. Although it can cause changes in plant development, it is not known the effect on post harvest quality when these shade cloths are used. Thus, the objective was to evaluate the effects of nets of different shading levels and spectral quality in alpinias 'Jungle King' and 'Jungle Queen' post-harvest quality. Flower stems stemmed crop under black shade cloths, with 30% and 50% shading, and blue and red nets with 50% of shading were maintained at the ambient temperature of 23°C for 15 days. The experimental design was distributed in a completely randomized way, totaling eight treatments of 4 replicates and two flower stems per plot. Evaluations of water uptake, relative fresh weight and quality through a scale of notes given by three evaluators were performed every two days, while reviews of the color of the bracts brightness parameters, chroma and Hue angle were performed every 3 days. Concurrently, bracts were collected every 3 days for the biochemical analysis of the activity of peroxidase and polyphenoloxidase. It was observed that the spectral quality influences the postharvest quality...