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Showing 1 to 16 of 16 for “"Helianthus annuus L"”.
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An investigation of aspects of the nitrogen physiology of Helianthus annuus L
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 …
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Untersuchungen zum radialen Abscisinsäure- und Wassertransport in Wurzeln von Helianthus annuus L. und Zea mays L.
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 …
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The physiological effects of heat stress on anthesis and pollination in domesticated sunflowers (Helianthus annuus L.)
… 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 …
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Effects of tillage and mulching on selected soil properties, growth and yield of sunflower (Helianthus annuus L.)
… 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 …
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An investigation of the pathway of nitrogen incorporation into the leaf and root metabolism of Helianthus annuus L
… 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 …
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Effect of small grain residue and tillage method on the emergence and growth of sunflower (Helianthus annuus L.)
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 …
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The effect of carbon dioxide, temperature and water stress on growth, yield and seed quality of sunflower (Helianthus Annuus L.)
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 …
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Acondicionamiento osmotico de simientes de girasol (helianthus annuus L.) para el avance de la germinación en siembras precoces para zonas áridas
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 …
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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.)
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.
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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
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 …
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Extracción de moléculas bioactivas de las hojas de girasol (helianthus annuus) utilizando disolventes a alta presión
… 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 …
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Métodos de predicción y técnicas de control de la condensación en invernaderos
… se cultivó Gerbera jamesonii (campaña 02/03) y Helianthus annuus L (campaña 03/04). La tesis se estructura en dos partes diferenciadas. En la primera parte se evaluó la influencia del sistema de calefacción sobre la condensación producida. Como sistema de calefacción se utilizaron suelo radiante …
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Organic manure effects on selected soil properties, water use efficiency and grain yield of sunflower
… on yield and water use efficiency of sunflower (Helianthus annuus L.) and selected soil physical and chemical properties under rainfed conditions. The experiment was a randomized complete block design (RCBD) with four treatments and four replications (control (C0), cattle manure (CM), poultry …
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Torta de girassol oriunda da produção do biodiesel na alimentação de cordeiros mestiços Santa Inês
Objetivou-se determinar o melhor nível de inclusão de torta de girassol, na dieta de ovinos mestiços Santa Inês em crescimento, com base no consumo de nutrientes, digestibilidade, balanço de nitrogênio, desempenho, características da carcaça e características qualitativas da carne destes animais. …
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Assessment of gentle remediation options for trace element-contaminated agricultural land under semi-controlled and field conditions
… conditions (chapter 3), a sunflower (Helianthus annuus L. mutant inbred line M7 (R3B-F-U/R13M10A; test series R13F-MP)), modified towards enhanced labile TE phytoextraction by chemical mutagenesis, proved less advantageous as pre-crop for winter wheat (Triticum aestivum L. cv. Tiger) …
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Histogénesis del fruto de girasol (Helianthus annus L.) : su aplicación al análisis del efecto de la radiación incidente sobre el peso y la aptitud al descascarado de los frutos y sus variables subyacentes
… en la AD de sus frutos. Palabras clave: girasol, Helianthus annuus L., tamaño potencial del pericarpo, tamaño final del fruto, aptitud al descascarado, estrés lumínico.