Browsing Agronomía by Title
Now showing items 348-367 of 403
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Rayado virus fino: detection in salivary glands and evidence of increase in virus titer in the leafhopper vector Dalbulus maidis.
(1981-03)El virus rayado fino del maíz se detectó en las glándulas salivales de insectos transmisores (Dalbulus maidis) examinadas al microscopio electrónico. Por otra parte,utilizando la técnica serológica de ELISA (enzyme-linked ... -
Recovery of oil palms (Elaeis guineensis Jacq.) affected by spear rots
(2015)Spear rot or PC (for the Spanish name pudrición del cogollo), known locally in Costa Rica as ‘flecha seca’ is a disorder that affects the development, physiology and yield of the oil palm. It is associated with the ... -
Regeneración in vitro mediante embriogénesis somática de variedades de cítricos. I. Obtención de callo friable y suspensiones celulares de naranja dulce (Citrus sinensis) y naranja agria (Citrus aurantium) cultivadas en Costa Rica
(1995-03-31)In vitro plant regeneration of citrus through somatic embryogenesis. I. Establishment of friable calli and suspension cultures of local cultivars of sweet orange (Citrus sinensis) and sour orange (Citrus aurantium). Friable ... -
Regulation of in vitro somatic embryogenesis with emphasis on to the role of endogenous hormones
(2001)Different aspects of the in vitro somatic embryogenesis regulation are reviewed in this paper.work. A description of g General aspects, such as terminology, uses, stages of development and factors associated with the somatic ... -
Relationship between endogenous hormone levels of grapevine callus cultures and their morphogenetic behaviour
(2000-01-01)Dark callus cultures from leaves and anthers of three grapevine genotypes (Seyval blanc, Riesling and Trollinger) were propagated in vitro for almost two years on medium deprived of growth regulators. Three different callus ... -
Rendimiento y calidad de pepino (Cucumis sativus L.) cultivado bajo invernadero
(2017-12)Se realizó una evaluación de rendimiento y calidad de cinco genotipos de pepino partenocárpico tipo americano (Cucumis sativus L.) cultivados bajo condiciones de invernadero durante la época seca en Alajuela, Costa Rica. ... -
Respiración, biomasa microbiana y actividad fosfatasa del suelo en dos agroecosistemas y un bosque en Turrialba, Costa Rica
(2015)Con el fin de evaluar algunas características microbiológicas y bioquímicas, se realizó un estudio comparativo entre 3 sistemas de manejo del suelo en Ultisoles, ubicado en Grano de Oro, Turrialba Costa Rica. Se eligieron ... -
Response of Endogenous Hormone Concentrations to Two Floral Inductive Treatments, viz. KNO3 and PBZ, in Mango cv. ‘Tommy Atkins’ Growing Under Tropical Conditions
(2012-07-20)Floral induction (FI) has been intensively studied in mango, more under sub-tropical than under tropical environments. Decreases in temperature below 20 °C, which is common in sub-tropical regions but seldom occurs in many ... -
Responses of anaerobic microorganisms to different culture conditions and corresponding effects on biogas production and solid digestate quality
(2016)Microbial communities of anaerobic digestion have been intensively investigated in the past decades. Majority of these studies focused on correlating microbial diversity with biogas production. The relationship between ... -
Responses of Arabica coffee (Coffea arabica L. var. Catuaí) cell suspensions to chemically induced mutagenesis and salinity stress under in vitro culture conditions
(2018)Crop improvement of Coffea arabica L. (coffee) via mutagenesis could accelerate breeding programs; thus, the present study aimed to develop an in vitro protocol using the chemical mutagens sodium azide (NaN3) and ethyl ... -
Revisiting Fungicide-Based Management Guidelines for Leaf Blotch Diseases in Soft Red Winter Wheat
(2015)Standard foliar fungicide applications in wheat are usually made between flag leaf emergence (Feekes [FK] 8) and heading (FK10.5) to minimize damage to the flag leaf. However, over the last few years, new fungicide programs ... -
Roasting, grinding, and storage impact onthermodynamic properties and adsorptionisotherms of arabica coffee
(2017-04)This work aimed to evaluate alterations on the water sorption of coffee due toroast, grind, and storage. Crude grain coffee (Coffea arabica) was roasted at twolevels: medium light and moderately dark. Grain was grinded in ... -
Sector agropecuario e indicadores de gestión ambiental en Costa Rica: perspectiva desde los resultados del Censo Agropecuario 2014
(2017-12)El autor realizó el proyecto en representación del Programa de Investigación en Desarrollo Urbano Sostenible (ProDUS), de la Universidad de Costa Rica (UCR). El trabajo se inició usando como referencia el enfoque de ... -
Seguridad alimentaria y nutricional en Guanacaste: el caso del territorio indígena de Matambú
(2014-11)El objetivo principal fue aportar algunos elementos para el mejoramiento de la producción de hortalizas, maíz y frijol en el Territorio Indígena de Matambú, a partir de la investigación-acción y el estudio comparado con ... -
Soil fertility characterisation of teak (Tectona grandis L.f.) plantations in Central America
(2015)Teak (Tectona grandis L.f.) is an important species in the worldwide quality tropical hardwood sector, which has gained significance in Central America since the first large plantations were established in the 1980s. The ... -
Somatic embryogenesis and plant regeneration in peach palm (Bactris gasipaes Kunth)
(2013)Peach palm (Bactris gasipaes Kunth) is a member of the family Arecaceae and is the only palm species with fully domesticated populations in the Neotropics. It is a multi-purpose but underutilized species. Today, fruit ... -
Somatic Embryogenesis in Peach-Palm (Bactris gasipaes) Using Different Explant Sources
(2016)Peach palm (Bactris gasipaes Kunth) is a member of the family Arecaceae and is a multipurpose but underutilized species. Nowadays, fruit production for subsistence and local markets, and heart-of-palm production for local, ... -
Some Physicochemical Properties of Maize Rayado Fino Virus
(1981)Maize rayado fino virus (RFV) was purified from infected maize (Zea mays) leaves. The virus had two components: empty shells and complete virus particles with sedimentation coefficients of 54S and 120S respectively, and ...