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Showing 1 to 20 of 35 for “"Helianthus annuus"”.

  1. Estudio agroecológico de las malezas : Helianthus annuus y Helianthus petiolaris

    Casquero, Mauricio Javier2014

    El género Helianthus incluye especies silvestres y cultivadas de importancia biológica, genética y económica. Entre ellas, H. annuus y H. petiolaris se encuentran naturalizadas en la región Central Argentina. Ambas especies pueden comportarse como maleza, invadir lotes de producción de granos, …

    uns-ar Repository record

  2. Economic Analysis of Sunflower (Helianthus annuus) Spacing in East Texas

    Wright, Carly2022

    … experiments were conducted on spacing of <em>Helianthus annuus</em> in East Texas to determine the spacing treatment that produces the greatest revenue per m<sup>2</sup>. The experiments had four spacing treatments of 8 × 15 cm, 15 × 15 cm, 23 × 23 cm, and 30 × 30 cm. Three different cultivars …

    sfasu Repository record

  3. MOLECULAR CHARACTERIZATION OF THE INTERACTION BETWEEN HELIANTHUS ANNUUS AND VERTICILLIUM DAHLIAE

    YAO, ZHEN2009

    Verticillium wilt, caused by the soil-borne Verticillium dahliae Klebahn is a serious problem in the production of sunflower worldwide. To date, information on sunflower resistance to Verticillium spp. is very scarce, although it is critical for an effective management of this pathogen. In this …

    manitoba Repository record

  4. An investigation of aspects of the nitrogen physiology of Helianthus annuus L

    Kaiser, James JDepartment of Biological Sciences1988

    Helianthus annuus L. plants were grown hydroponically in Long Ashton nutrient solutions containing either 2 mM ammonium, 2 mM nitrate or 1 mM ammonium+ 1 mM nitrate as the nitrogen supply to determine the effect of these nutrients upon physiological processes within the plant. Nitrate fed plants …

    cape-town Repository record

  5. Pinching and Spacing Effects on Cut Sunflower (Helianthus annuus) Production in East Texas

    Burnett, Rebecca B2017

    … evaluated pinching and spacing on <em>Helianthus annuus </em>in East Texas to determine their effects on growth and development. Experiment 1 was designed to determine the effects of pinching nodes 1, 2, 3, or 4 on ‘Pro Cut Gold’ sunflowers. Results from experiment 1 showed non-pinched …

    sfasu Repository record

  6. Floral trait architecture in crop sunflower (<i>Helianthus annuus</i>) under drought conditions

    Segarra, Lauren2020

    … in oilseed crops such as sunflower (<em>Helianthus annuus</em>), but their susceptibility to drought stress is understudied. The goal of this study was to describe the floral trait architecture of <em>H. annuus</em> crop lines under drought versus well-watered conditions and examine the …

    central-wash Repository record

  7. Untersuchungen zum radialen Abscisinsäure- und Wassertransport in Wurzeln von Helianthus annuus L. und Zea mays L.

    Hose, EleonoreUniversität Würzburg

    Mit den Experimenten dieser Arbeit konnte erstmals gezeigt werden, dass ein Phytohormon wie Abscisinsäure mit dem "Solvent-drag" des Wasserflusses apoplastisch durch den Wurzelzellwandbereich in die Xylemgefäße transportiert werden kann. Es konnte ein Bypass-Fluss für ABA durch den gesamten …

    wurz-thes Repository record

  8. The physiological effects of heat stress on anthesis and pollination in domesticated sunflowers (Helianthus annuus L.)

    University of Pretoria2022

    … affect anthesis and pollination in sunflowers (Helianthus Annuus L.). This study investigates the effect of heat stress on timing of pollen emergence, style elongation rate, pollinator visits, pollen viability and stigma receptivity. We sampled during the anthesis period in a field setting under …

    pretoria Repository record

  9. Extracción de moléculas bioactivas de las hojas de girasol (helianthus annuus) utilizando disolventes a alta presión

    Fuentes Gandara, Fabio Armando2021

    … bioactivas a partir de las hojas de girasol (Helianthus annuus L), utilizando dióxido de carbono y adicionando un 50% de los codisolventes agua, etanol-agua y etanol, por tanto, se profundiza en el estudio de extractos de girasol con mayores propiedades alelopáticas que serían útiles para …

    cadiz Repository record

  10. Effects of tillage and mulching on selected soil properties, growth and yield of sunflower (Helianthus annuus L.)

    Selolo, Koena Revonia2021

    … soil properties, growth and yield of sunflower (Helianthus annuus L.). The experiment was laid out in a split plot design with three replications. The experiment was conducted during the 2018/19 and 2019/20 cropping seasons. Treatments consisted of two (2) tillage methods (conventional and …

    venda Repository record

  11. EFFECT OF PINCHING AND SPACING ON THE GROWTH AND DEVELOPMENT OF SUNFLOWERS (HELIANTHUS ANNUUS) IN EAST TEXAS

    Cheema, Bilawal Irshad2018

    <p><em>Helianthus annuus</em> cultivars were grown in East Texas to evaluate the effect of pinching and spacing on their growth and development. The first experiment was conducted twice (Trial 1A, 28 April 2017 and Trial 1B, 3 August 2017) to evaluate the effect of pinching at nodes 1, 2, 3, and 4 …

    sfasu Repository record

  12. An investigation of the pathway of nitrogen incorporation into the leaf and root metabolism of Helianthus annuus L

    Kaiser, James JosephDepartment of Biological Sciences1978

    … grown and vermiculite- . -3 -3 grown Helianthus annuus fed at 50 µg N cm and 300 ~g N cm feeding level was analysed for nitrate, ammonia, and amino compounds. Nitrate accounted for 771to 94% of the total nitrogen transported via the xylem stream. The pathway of nitrate-N assimilation …

    cape-town Repository record

  13. Effect of small grain residue and tillage method on the emergence and growth of sunflower (Helianthus annuus L.)

    Edwards, Anne DuncanVirginia Polytechnic Institute and State University1983

    Field studies were conducted to determine the effects of wheat and barley residue and tillage method on the emergence and growth of oilseed sunflower. Additional studies were executed to test the effects of wheat, barley, and rye root and straw residue and the effects of cold water extracts of …

    vt Repository record

  14. The effect of carbon dioxide, temperature and water stress on growth, yield and seed quality of sunflower (Helianthus Annuus L.)

    University of Pretoria2024

    Sunflower (Helianthus annuus L.) is currently the third most resilient grain crop grown in Southern Africa and the region's most important oilseed crop. Its low cost of production and capacity to yield consistently in adverse weather conditions makes it a highly desirable crop for farmers to …

    pretoria Repository record

  15. Acondicionamiento osmotico de simientes de girasol (helianthus annuus L.) para el avance de la germinación en siembras precoces para zonas áridas

    Rojo Hernandez, CarlosAgronomos2005

    El cultivo del girasol (Helianthus annuus L.) en secano experimenta con frecuencia déficit de agua durante las fases más críticas de su ciclo. Una posible opción para soslayar este problema es el adelanto de la siembra. El avance de la germinación previo a la siembra es una práctica que puede …

    upm Repository record

  16. Estudio de los flujos netos simultáneos de H+ y K+ y la actividad redox en raíces aeropónicas estériles de plántulas de girasol (Helianthus annuus L.)

    Garrido Carballo, InmaculadaUniversidad de Extremadura (España)1997

    This memory study the H+ y K+ fluxes simultaneously measured in sunflower roots. Both fluxes are not related directly. The plasmalemma redox activity was too measured and their relation with the H+ y K+ fluxes.

    dialnet Repository record

  17. Estudio comparativo de las necesidades Hídricas de Plantas de Maíz (Zea mays, L.) y Girasol (Helianthus annuus, L): Relación entre consumo de agua, producción y calidad del fruto

    Muriel Fernández, José Luis1975

    Las proteínas, junto con las materias grasas, constituyen una parte muy importante de la alimentación humana y animal. Es lógico pensar, pues, que su consumo en el mundo vaya en constante progreso. El cultivo del maíz tiene en España un gran interés, ya que es imprescindible conseguir un fuerte …

    sevilla Repository record

  18. Estudio de prefactibilidad para la instalación de una planta productora de bombones de chocolate (Theobroma cacao) al 60% cacao con relleno de maracuyá (Passiflora edulis) y semillas de girasol (Helianthus annuus)

    Ascorra Campos, Alithu Almendra, Huarcaya Avendaño, SergioUniversidad de Lima2021

    Actualmente, la tendencia es el consumo de productos saludables, libres de conservantes y de grasas trans (AGT), para evitar el deterioro de la salud. Por ello, se investiga la factibilidad de bombones de chocolate al 60% cacao relleno de maracuyá y semillas de girasol. Este país es muy rico en la …

    lima Repository record

  19. Evolutionary responses to global change: an experimental test of the effect of altered precipitation on hybridization rates in sunflower (Helianthus)

    Sneck, MichelleRice University2013

    … rates of hybridization between two congeners, Helianthus annuus (common sunflower) and H. petiolaris (prairie sunflower). We found that H. annuus maternal plants produced hybrid progeny more than H. petiolaris maternal plants, with a trend for decreased rates of hybridization with increased …

    rice Repository record

  20. Characterizing Low Nutrient Stress Resistance in Crop Sunflowers (Helianthus annus)

    Croshaw, Casey2018

    … this study, 60 different genetic sunflower (<em>Helianthus annuus</em>) lines were grown in the field under fertilized and unfertilized treatments to assess phenotypic traits associated with low nutrient stress resistance. Sunflowers were assessed for stress resistance using height, stem …

    central-wash Repository record

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