Revistas: Envíos recientes
Mostrando ítems 201-210 de 3334
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Herencia de la altura de planta de trigo y de otros caracteres en condiciones de la costa central del Perú
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)Information on the hereditary control of plant height and other characters was obtained from a ´La Molina 60´ X ´Dwarf wheat´cross. Analysis of population means and frequency distribution for plant height suggests the ... -
Studies on the shootborer Hypsipyla grandella (Zeller) (Lep., Pyralidae), 27: Biological and chemical screening for the basis of resistance of Toona ciliata M.J. Roem. var. australis
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)La presente investigación fue dirigida a estudiar la base química de la inmunidad del cedro australiano (Toona cilata vav australis) al barrenador de las Meliaceas, Hypsipyla grandella. En plantaciones de campo se constató ... -
Surface water quality in Costa Rica: new initiatives and challenges
(IWA Publishing, 2024-11-04)Despite Costa Rica's reputation for being a leader in environmental policy and its thriving nature-based tourism industry, the nation has had poor surface water quality. Reasons for poor water quality include the lack of ... -
Inducción de mutaciones de color de semilla con metanosulfonato de etilo en algunas variedades de frijol común
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)Certain been varieties possessing characteristics of favorable yield and disease tolerance frequently are not used as cultivars due to the differential preference for certain seed-coat colors among consumers. Changes in ... -
Shade versus intensification: Trade-off or synergy for profitability in coffee agroforestry systems?
(Elsevier, 2023-12-11)This study assesses the economic viability of different coffee production strategies in Costa Rica and Guatemala, comparing intensive systems with shaded agroforestry approaches. Using a typology based on levels of ... -
Physiological studies on groundnut plants with boron toxicity, II: Effect on nitrogen metabolism
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)En cultivos en avena el efecto de un suministro de 10 ppm de boro sobre el metabolismo del nitrógeno se estudió en las hojas centrales del maní (cv ´TMV-2´ tipo compacto). Prácticamente no hubo cambio en los contenidos de ... -
Movimiento de nitrato en un suelo volcánico bajo diferentes regímenes de riego
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)The effect of the irrigation regime on the nitrate movement by mass flow was studied in a volcanic ash soil. Three nitrate treatments, (0, 80 and 160 Kg N/ha) and five irrigations heads (2, 4, 8, 12 and 16 cm) werw used ... -
Forest Cover and Dengue in Costa Rica: Panel Data Analysis of the Effects of Forest Cover Change on Hospital Admissions and Outbreaks
(Springer Nature Link, 2024-03-14)Approximately 3.9 billion people are at risk of infection with dengue fever, a group of viruses transmitted by mosquitoes (Halstead in Annu Rev Entomol 53:273–291, 2008. https://doi.org/10.1146/annurev.ento.53.103106.0933262008; ... -
Effects of copper fungicide sprays on soil and leaf nutrient composition and yield of coffee trees
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-04)Arboles maduros de Coffea arabica L. (cv. `S.L. 34') cultivados en el campo fueron asperjados con varias dosis de un fungicida cuproso (Cu subíndice 2 O) a 0,0, 0,50, 1,00 y 1,50 por ciento de concentración peso/volumen ... -
An investigation of palmetto, Paurotis wrightii (Griseb. & Wendl.) Britt., communities in Belize, Central America
(1975-01-01)Este estudio examinó cuatro comunidades de palmeto [Paurotis wrightii (Griseb. & Wendl.) Britt.] de la planicie costanera de Belize. Los cuatro sitios caracterizan porciones de la gradiente ambiental desarrollados por ...
