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| Registros recuperados: 413 | |
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| Brito, Giovani Greigh; Empresa Brasileira de Pesquisa Agropecuária; Sofiatti, Valdinei; Empresa Brasileira de Pesquisa Agropecuária; Brandão, Ziany Neiva; Empresa Brasileira de Pesquisa Agropecuária; Silva, Vivianny Belo; Empresa Brasileira de Pesquisa Agropecuária; Silva, Franklin Magnum; Empresa Brasileira de Pesquisa Agropecuária; Silva, Dalva Almeida; Empresa Brasileira de Pesquisa Agropecuária. |
| Analytical techniques used to extract chlorophyll from plant leaves are destructive and based on the use of organic solvents. This study proposes a non-destructive quantification of the photosynthetic pigment concentration in cotton leaves using two portable chlorophyll meters, the SPAD-502 and the CLOROFILOG 1030. After obtaining 200 leaf discs, each with an area of 113 mm2, the greening rate in each disc was determined by the average of five readings from both meters. Immediately after measurement, 5 mL of dimethyl sulfoxide (DMSO) was added, and the samples were kept in a water bath at 70ºC for 30 min. After cooling, 3 mL of the liquid extract was used for analyses by spectrophotometry at 470, 646 and 663 nm. Mathematical models were adjusted from... |
| Tipo: Pesquisa Empirica de Campo |
Palavras-chave: Fisiologia de plantas cultivadas Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton 5.01.03.06-7 Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/10926 |
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| Brito, Giovani Greigh; Empresa Brasileira de Pesquisa Agropecuária; Suassuna, Nelson Dias; Empresa Brasileira de Pesquisa Agropecuária; Silva, Vivianny Nayse; Empresa Brasileira de Pesquisa Agropecuária; Sofiatti, Valdinei; Empresa Brasileira de Pesquisa Agropecuária; Diola, Valdir; Empresa Brasileira de Pesquisa Agropecuária; Morello, Camilo Lelis; Empresa Brasileira de Pesquisa Agropecuária. |
| The initial goal of this study was to measure the efficiency of carbon isotope discrimination (Δ) in distinguishing between cotton plant genotypes subjected to two water regimes. In addition, ∆ measurements, leaf water potential and gas exchange ratios were monitored. Using Brazilian breeding lines, this study also tested the usability of ∆ as a proxy for selecting high-performing yield components in cotton plants grown in unfavorable conditions, particularly water deficiency. For these experiments, ∆ and yield components were measured and their correlations analyzed. Differences among cotton genotypes for Δ (p < 0.0001) were verified, and it was found that this variable was significantly correlated with gas exchange. There was a significant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.03.06-7 - fisiologia de plantas cultivadas gas exchange; Carbon fraction; Cotton; Abiotic stress Desenvolvimento de ferramentas para fenotipagem. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17986 |
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| Azadbakht, Mohsen; Jahanian, Mahshid; Asghari, Ali; Nowrouzieh, Shahram. |
| The cotton plant contains fruits called capsules or bolls, in which the cotton fiber grows, and after the growth stages, the fibers appear through separating the carpels. This research investigated the required force to pick the cottonseed from four cotton variety (Golestan, Khorshid, Sajedi, and Kashmar) in three levels of moisture (three harvesting times) and three revolutions (1500, 2500 and 3500 rpm). To measure this force, designed and manufactured a device similar to a spindle cotton picker and using the actual needle of John Deere machine 9920. The bolls were tested in different revolution and moisture levels with the device. The results of experiments showed that the cross-effects of variety on speed, harvesting time on variety and harvesting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cotton; Force; Fiber; Harvest; Cottonseed. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5354 |
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| shaker, ahmed mahmoud. |
| The Egyptian cotton leaf worm, Spodoptera littoralis (Boisd.) (Noctuidae: Lepidoptera) is an economically important pest with a wide range of host plants. It attacks certain vegetable and field crops such as cotton, tomatoes, cabbage and squash in Egypt, for causing severe injuries to the plants in all phonological crop stages, In addition to this species has acquired resistance to many insecticides. The overall objective of this investigations was to look for new control strategy through evaluate the effects of application of TiO2 nanoparticles on the survival and biology of this insect. The experiment were carried out under laboratory conditions, the experiment was achieved with two treatments, consisting of TiO2 nanoparticles application, and a negative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: TiO2; Nanoparticles; Cotton; Leaf worm; Nanopesticide; Agriculture. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4390 |
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| FERNANDES,FRANCISCO S.; GODOY,WESLEY A.C.; RAMALHO,FRANCISCO S.; GARCIA,ADRIANO G.; SANTOS,BÁRBARA D.B.; MALAQUIAS,JOSÉ B.. |
| ABSTRACT Population dynamics of aphids have been studied in sole and intercropping systems. These studies have required the use of more precise analytical tools in order to better understand patterns in quantitative data. Mathematical models are among the most important tools to explain the dynamics of insect populations. This study investigated the population dynamics of aphids Aphis gossypii and Aphis craccivora over time, using mathematical models composed of a set of differential equations as a helpful analytical tool to understand the population dynamics of aphids in arrangements of cotton and cowpea. The treatments were sole cotton, sole cowpea, and three arrangements of cotton intercropped with cowpea (t1, t2 and t3). The plants were infested with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aphids; Cotton; Cowpea; Dynamics; Mathematical models. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100311 |
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| Mariconi,F.A.M.; Geraldi,F. I.; Biondo,C.J.; Donatoni,J.L.; Clari,A. I.; Raizer,A.J.; Arashiro,F.Y.. |
| O presente trabalho foi realizado com o objetivo de continuar os experimentos que visam o combate ao "ácaro branco" Polyphagotarsonemus latus (Banks, 1904) em algodoeiro. Quatro tratamentos foram aplicados em pulverização convencional e 2 outros produtos com "Electrodyn", num total de 7 tratamentos (com a testemunha). Vejamos quais são estes: A) testemunha; B) dicofol; C) bromopropilato; D) abamectina + alquenol multimetílico, sendo o último um feromônio; E) dicofol; F). profenofós e G) abamectina (Quadro 1). Os tratamentos C e E foram feitos com soluções especiais para "Electrodyn". A análise dos resultados demonstrou que os tratamentos E e D foram os melhores. Palavras-chave: Polyphagotarsonemus latus, defensivos químicos, ácaro branco, algodoeiro. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Polyphagotarsonemus latus; Tropical mite; Cotton; Chemical control. |
| Ano: 1987 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761987000200026 |
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| Samih,Mohammad Amin; Zarabi,Mehdi; Yazdani,Maryam; Rouhani,Mohammad. |
| The aim of this work was to construct life table of Bemisia tabaci (Gen.) A and B (silverleaf whitefly B. argentifolii Bellows and Perring) biotype (Hem.: Aleyrodidae) on two host plants; cotton, (Gossypium hirsutum L.) and rapeseed, (Brassica napus L.). Experiments were conducted in a growth chamber under 24 ± 2ºC, 55±3% RH and 16:8 (L:D) h photoperiod on caged plants of cotton G. hirsutum L. (Varamin 76 variety) and rapeseed B. napus L. (global variety. The intrinsic rate of natural increase (r m), net reproductive rate (R0) and mean generation time (T) for B. tabaci A biotype was 0.1010 females per female per day, 18.4075 females per female and 30.079 day (d) on cotton; 0.1286, 30.6760 and 26.77 d on rapeseed; and for B biotype (B. argentifolii) those... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bemisia argentifolii; Bemisia tabaci; Cotton; Life-table; Rapeseed. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000300001 |
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| Wrege,Marcos Silveira; Caramori,Paulo Henrique; Gonçalves,Sergio Luiz; Almeida,Wilson Paes de; Marur,Celso Jamil; Pires,José Ricoy; Yamaoka,Ruy Seiji. |
| Cotton is cultivated in the North and West of Parana State, southern Brazil, under conditions of climatic risk variable in space and time. Risks of temperature below 15ºC at the establishment period, daily average temperature below 20ºC at the stage of cotton boll opening, and soil water deficit for both plant establishment and flowering periods, were estimated to identify homogeneous zones with sowing periods of lower climatic risk. The time interval with adequate temperature, associated with minimum risks of the other factors and yield data from field experiments allowed the identification of seven distinct zones, with best sowing periods ranging from September 20 to November 20. Official credit to the farmers is conditioned by the Central Bank of Brazil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cotton; Climatic risk; Planting dates; Zoning; Low temperature. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000100010 |
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| Pazzoti,Geisa; Souza,Camila; Veronezi,Carolina; Luzia,Débora; Jorge,Neuza. |
| ABSTRACT The oxidative stability of linseed (L), cotton (A), and coconut (C) oils, as well as of linseed:cotton (LA), linseed:coconut (LC), and linseed:cotton:coconut (LAC) compound oils was evaluated under accelerated storage at 60°C/20 days. Coconut oil showed to be rather stable, mainly due to low levels of peroxides, conjugated dienes, ρ-anisidine, and long induction period. In addition, along with cotton oil, it improved the stability of linseed oil in the formulation of LAC compound oil. As to fatty acid profile, the compound oils showed to be composed mainly by unsaturated fatty acids. Cotton and coconut oils presented higher retention of total phytosterols, 78.87 and 76.16%, respectively, after 20 days of storage, when compared to linseed oil. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linseed; Cotton; Coconut; Lipid oxidation; Vegetable oils. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100502 |
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| Centurion,José Frederico; Beutler,Amauri Nelson; Souza,Zigomar Menezes de. |
| The objective of this study was to assess the physical attributes of a kaolinitic oxisol, medium texture (Haplustox) and an oxidic oxisol, clayey (Eutrustox) under different usage systems, localized in the region of Jaboticabal, SP, Brazil. The usage systems were sugarcane, cotton and forest. Parameters such as soil bulk density, total porosity, macro and microporosity at the depths of 0.0-0.1; 0.1-0.2; 0.2-0.3, and 0.3-0.4 m were evaluated. Haplustox showed greater bulk density and smaller total porosity, macro and microporosity. The usage increased the bulk density in 0.0-0.3 m depth, with greater effects on the kaolinitic oxisol, mainly in 0.1-0.2 m depth in the areas cultivated with sugarcane. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane; Cotton; Forest; Mineralogy; Porosity; Bulk density. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500007 |
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| Costa,Denilson Bezerra; Souza,Brígida; Carvalho,Geraldo Andrade; Carvalho,César Freire. |
| ABSTRACT - This work was designed to evaluate the residual action of the insecticides trichlorfon, triflumuron, endosulfan, fenpropathrin, chlorpirifos, tebufenozide and esfenvalerate, sprayed on cotton plants, to second-instar larvae of Chrysoperla externa (Hagen, 1861), under greenhouse conditions. The experimental design was completely randomized with ten replicates. Three larvae were released on each plant, in the 1st, 12th and 23rd day after pesticides spray. Tebufenozide and esfenvalerate were little persistent (class one), while trichlorfon, triflumuron and endosulfan were slightly persistent, decreasing the survival of C. externa larvae over 30%, up to 14 days after spray. Fenpropathrin and chlorpirifos caused mortality over 30%, up to 25 days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selectivity; Predator; Pesticides; Cotton. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000400014 |
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| Murtaza,Naveed. |
| Amplified fragmentlength polymorphism (AFLP) markers have been used to ascertain the intensity of inherent diversity and relatedness in cotton (Gossypium spp.) plants. The effectiveness of this method to distinguish inter and intra specific difference in cotton could be handy in cultivar recognition and in marker assisted parental selection tool for plant breeders. Twenty cotton cultivars belonging to Gossypium hirsutum L., and G. arborium L. from the Pakistan and US origin were used for AFLP based genetic diversity estimates. The objective of this study was to assess the level of genetic variation among some cotton cultivars belonging to the old and new world species of cotton. Four EcoRI-MseI primer-pair combinations were used forthe AFLP analysis. The... |
| Tipo: Journal article |
Palavras-chave: AFLP; Cluster analysis; Cotton; Genetic diversity; PCR. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400013 |
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| ZONTA, J. H.; RODRIGUES, J. I. da S.; CAVALCANTE, V. R.; LEITE, R. de M. H.; COSTA, R. F. da. |
| O sistema Integração Lavoura Pecuária e Floresta (ILPF) é uma estratégia de cultivo que objetiva a produção sustentável, integrando atividades agrícolas, pecuárias e fl orestais na mesma área, em cultivo consorciado, em sucessão ou rotacionado, e busca efeitos sinérgicos entre os componentes do agroecossistema, contemplando a melhoria ambiental, a valorização dos seres humanos e a viabilidade econômica. Em outras palavras, o sistema ILPF consiste na diversifi cação de cultivo, de forma que o produtor consiga, além de melhorar sua renda, conservar o solo e água da propriedade, melhorando suas condições de cultivo ao longo do tempo, e com melhor aproveitamento de água da chuva. Através deste sistema, o produtor, sendo familiar ou empresarial, tem a... |
| Tipo: Folhetos |
Palavras-chave: Sistema de Cultivo; Integração; Lavoura; Pecuária; Floresta; Conservação da Água; Conservação do Solo; Algodão; Milho; Soja; Gergelim; Feijão; Desenvolvimento Sustentável; Controle da Erosão; Plantio Direto; Cropping systems; Intensive livestock farming; Agroforestry; Soil conservation; Water conservation; Cotton; Bean meal; Soybean meal; Soybean oil; Sesame meal; Sustainable development; Erosion control; Direct seeding. |
| Ano: 2022 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1150301 |
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| CHITARRA, L. G.; PERINA, F. J.; TARDIN, F. D.; WRUCK, D. S. M.; ARAÚJO, A. E. de. |
| A mancha de ramulária, causada pelo complexo de fungos Ramulariopsis gossypii e Ramulariopsis pseudoglycines (sin. Ramularia areola) é a principal doença foliar do algodoeiro devido a sua alta frequência e intensidade de ocorrência, principalmente em áreas sem a rotação de culturas. O controle químico a base de estrobilurinas, triazóis, hidróxido de fentina e carboxamidas (sítios-específicos), isolados ou em combinação com multissitios é uma das táticas de manejo mais utilizada para o controle da doença. Esse trabalho teve como objetivos determinar a eficácia dos fungicidas multissítios Cuprodil, Unizeb Gold e Previnil, isolados ou em combinação com fungicidas sítios-específicos no controle da mancha de ramulária e determinar a influência desses fungicidas... |
| Tipo: Folhetos |
Palavras-chave: Algodão; Planta; Doença Fúngica; Fungicida; Ramularia; Cotton; Fungal diseases of plants; Fungicides. |
| Ano: 2020 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133966 |
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| Registros recuperados: 413 | |
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