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Supplementation with organic selenium and its effect on productive and reproductive performance in grazing dairy cows in Costa Rica
Evaluación de la suplementación con selenio orgánico y su efecto sobre el desempeño productivo y reproductivo de vacas lecheras en pastoreo en Costa Rica
(2014-07-04)
The objective was to evaluate the effect of supplementation with selenized yeast, derived from a specific strain of Saccharomyces cerevisiae (CNCM I-3060), on productive and reproductive performance and on selenium ...
Foliar nutrient concentration in teak plantations at the Panama Canal watershed
Concentración foliar de nutrimentos en plantaciones de teca en la cuenca del Canal de Panamá
(2014-07-04)
Foliar concentration of macro- and micronutrients in teak plantations at the Panama Canal Watershed was measured on sites classed as high, medium, and low in growth (volume.ha -1 ). For the same purpose, plantations where ...
Root development in F1 coffe hybrids obtained by tissue culture
Estudio del desarrollo radical en almácigo de híbridos F1 de café obtenidos por cultivo de tejidos
(2014-07-04)
F1 Hybrid seedlings, obtained by indirect somatic embryogenesis, were acclimatizated under greenhouse conditions, separated in 2 types of container: biodegradable mesh with compressed turf (Jiffy®) and the other on ...
Effect of sulpomag and organic complexs as partial substitutes of the culture medium used in the micropropagation of Musa sp. Cv. Cavendish
Efecto del sulpomag y complejos orgánicos como sustitutos parciales del medio de cultivo de micropropagación de Musa sp. Cv. Cavendish
(2014-07-04)
The Sulpomag natural fertilizer, or potassium sulfate and magnesium, constituted by K 2 O 22%, MgO 22%, S 18% and Cl (chloride) 2.5% plus organic complexes of coconut water 10 to 20%, and casein hydrolyzate 250 and 500 ...
Effectiveness of formic acid and thymol in the control of Varroa destructor in africanized honey bee colonies
Efectividad del ácido fórmico y el timol en el control del ácaro Varroa destructor en colmenas de abejas africanizadas
(2014-07-04)
The effectiveness of formic acid and thymol in the control of the mite Varroa destructor was evaluated from June to October 2011 in an apiary of 16 Africanized honeybee colonies (the colonies did not receive chemical ...
Phosphorous balance on Costa Rican dairy farms
Balance de fósforo en fincas para la producción de leche en siete cantones de la región Huetar Norte y egión Central de Costa Rica
(2014-07-04)
The objective was to quantify P use in 11 dairy farms located in the provinces of San Jose, Cartago and Alajuela. Data such as feed purchases, milk sales, purchase and removal of animals between January and December 2010 ...
Characterization of visual symptoms of nutritional deficiencies in oak seedlings
Caracterización de los síntomas visuales de deficiencias nutricionales de plántulas del roble andino en invernadero
(2014-07-04)
The identification of visual symptoms of deficien- cies is a widely used method in the diagnosis of nutritional problems in agricultural and forestry production. The aim of this study was to charac- terize visual symptoms ...
Analysis of the potato crop nutrient status in Costa Rica, on the basis of existing information
Análisis del estado nutrimental del cultivo de la papa en Costa Rica con base en información existente
(2014-07-04)
An analysis of the potato leaf nutrient concentration in Costa Rica was made, from the results of foliar analyses conducted during the years 2006-2012 at the Soil and Foliar Laboratory of the Agronomic Research Center, ...
Body condition assessment in a grazing Jersey cows herd in the highlands of Cartago. Variations during the productive cycle
Evaluación de la condición corporal en un hato de vacas Jersey en pastoreo en la zona alta de Cartago. Variaciones durante el ciclo productivo
(2014-07-04)
The aim of this research was to carry out a body condition score (BCS) observational study in a commercial grazing Jersey herd in Cartago, Costa Rica (9°55` N, 83°51` W, 2350 m of altitude). The study comprised 5864 BCS ...
Soil enzyme activity -Dehidrogenase, ß-glucosidase, Phosphatase and Urease- under different crops
Actividad enzimática del suelo -Deshidrogenasa, β-Glucosidasa, Fosfatasa y Ureasa- bajo diferentes cultivos
(2014-07-04)
The activity of 4 soil enzymes in farms under different agronomic managements and in different soil types was analyzed. The enzymes tested were phosphatase, β-glucosidase, dehydrogenase and urease. Soil samples were taken ...