Investigación: Recent submissions
Voici les éléments 111-120 de 7918
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On the heriability of wood density in Swietenia macrophylla
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)Add it up Basic wood density was determined in samples taken from seven to eight year old Swietenia macrophylla trees representing twelve progenies of heavy and light parent trees from Mexico and Central America. No ... -
Infección por basidiósporas de Thanatephorus cucumeris causante de una enfermedad foliar en tabaco
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)Thanatephorus cucumeris, la etapa perfecta Se descubrió que Rhizoctonia solani era el agente causal de una enfermedad no reportada previamente en las plantas de tabaco en Costa Rica. Manchas circulares de aproximadamente ... -
Studies on the shootborer, Hypsipyla grandella (Zeller) (Lepidoptera: Pyralidae). XX. Observations on emergence and mating of adults in captivity
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)This paper presents observations on the emergence and mating of Hypsipyla grandella in captivity. The average pupal stage lasted eight days. Pupal size elongated by 12 percent shortly before emergence. Emergence occurred ... -
Pod-value studies of Amelonado and Amazon cacao
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)Se presentan resultados de estudios de "valores de fruto" para 20 meses en variedades de cacao Amazonas y Amelonado. Las diferencias varietales en peso promedio de mazorca, "peso de semilla húmeda", peso promedio de semilla ... -
Producción de carne a base de becerros lecheros: Becerros y becerras de Holstein cruzados con Hereford o Charolais comparado con becerros Holstein puros
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)La carne producida por México no es suficiente para satisfacer la demanda del mercado mexicano y el mercado estadounidense. Los altos precios de la carne estimulan la investigación de otras fuentes de producción potencial ... -
Regeneration of kola trees, Cola nitida (Vent) Schott and Endlicher, by coppicing
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)Old kola trees whose production was already very low were cut for regrowth at the beginning, middle and end of the rainy season at various heights, 30, 60 and 120 cm from the ground level, in order to study the regeneration ... -
Comportamiento de variedades y procedencias de Pinus caribaea Morelet, introducidas en Turrialba, Costa Rica
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)El objetivo de esta investigación fue analizar el crecimiento inicial de las variedades y procedencias de Pinus caribaea Morelet en plantaciones experimentales ubicadas en el sistema de clasificación de zonas de vida "Bosque ... -
Sperm transferability of gamma-sterilized Mediterranean fruit fly males
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)In the laboratory, the receptivity of Mediterranean flies towards a second mating was studied. Virgin females from six days old were placed to mate with young, sterile, 10-kilogram, or normal, sexually mature males between ... -
Grazing trials in the U.S. Virgin Islands
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)The productive capacity of eight selected tropical grasses was evaluated in grazing trials on different soils and in different rainfall zones in the Virgin Islands. Productive capacity was measured as livestock-sustaining ... -
Mineralogical properties of two profiles of volcanic ash soil from Costa Rica
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1973-07-01)The mineralogical properties of two volcanic ash-derived stele, Binisito series, from the Irola and Victoria farms in Costa Rica were studied. Sand and silt fractions of field-wet soil were obtained by sieving the soil ...
