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Now showing items 21-30 of 73
Eight year results from provenance trials of Pinus caribaea var. hondurensis, P. oocarpa and P. tecunumanii in the Valle del Cauca, Colombia
(IICA, San José (Costa Rica), 1992-07)
En 1982 se establecieron en el departamento del Valle del Cauca, Col., cinco ensayos con familias de P. caribaea var. hondurensis, P. oocarpa y P. tecunumanii. Se analizaron las mediciones a los ocho años de edad por ...
Determination of a pre-vernalization phase in carrot (Daucus carota L.) cv. flakkee
(IICA, San José (Costa Rica), 1992-04)
El presente trabajo fue realizado con el fin de determinar la existencia de una fase de prevernalización en Daucus carota L. cv. Flakkee. Se utilizaron plantas de zanahoria en los siguientes estados fenológicos: 9 a 10 ...
Effect of alternative methods of advancing early generation populations of common bean in the tropics
(IICA, San José (Costa Rica), 1992-10)
Se estudió la eficiencia de los métodos masal de una vaina (MUV) y masal de una semilla (MUS) por planta, para adelantar generaciones tempranas (F subíndice 2 a F subíndice 5) en tres poblaciones, TR 4678, TR 4683 y TR ...
Studies on the ecology and behaviour of P. xylostella L. cannibalism induced by starvation
(IICA, San José (Costa Rica), 1992-10)
Se diseñaron experimentos para observar y registrar el comportamiento de las larvas de la polilla del repollo, Plutella xylostella (L.) (Lepidoptera: Plutellidae) bajo inanición, después de haber sido bien alimentadas. ...
Natural resource conservation with peoples' participation in the uplands of the Maribios Volcanic Ranges of Nicaragua. I. Appropriate land use and rural social diversity
(IICA, San José (Costa Rica), 1993-07)
Biophysical and socioeconomic problems related to natural resource conservation of the uplands of the Maribios volcanic ranges of Nicaragua are discussed. Since the USDA method for land classification was found to be ...
Identification and distribution of melon-infecting viruses and their vectors in two provinces of Costa Rica
(IICA, San José (Costa Rica), 1993-07)
El virus de la mancha anular de la papaya o "papaya ringspot virus" (PRSV), el virus del mosaico de la sandía II o "watermelon mosaic virus II" (WMV-II), el virus del mosaico del pepino o "cucumber mosaic virus" (CMV) y ...
Natural resource conservation in the Maribios uplands of Nicaragua. III. Conceptual framework for incentives
(IICA, San José (Costa Rica), 1993-07)
Considerable work has been done on conservation incentives, but a simple, uniform decision-making criterion is still lacking. This paper develops a decision-making tool in the form of a three-part conceptual framework for ...
Heat treatment for enhanced responsiveness of dorman axillary buds of pineapples
(IICA, San José (Costa Rica), 1994-04)
Explants 3-5 mm in diameter, consisting of dormant axillary buds and adjacent stem tissue, were excised from the stem region of the crown, disinfected, rinsed and immersed in distilled water at 60 deg C for 6 or 8 min ...
Fall armyworm and neotropical cornstalk borer on sorghum and maize intercropped with legumes in Honduras
(IICA, San José (Costa Rica), 1994-04)
The effects of intercropped legumes on densities of Spodoptera frugiperda (FAW) and Diatraea lineolata (NCSB) on sorghum (Sorghum bicolor) and maize (Zea mays) were studied in central Honduras in 1986 and 1987. Sorghum and ...
Effects of Bauhinia monandra (Kurz) seed extracts on yield, mophology and anatomy of cassava plants
(IICA, San José (Costa Rica), 1993-10)
Estacas de yuca TMS30572 fueron remojadas parcialmente en extractos de semillas B. monandra por 70 h y, luego, sembradas en el campo en abril de 1988 y cosechadas en abril de 1989. Se llevaron a cabo un segundo y un tercer ...