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Isotermas de adsorción de fósforo en sedimentos del estuario de Maracaibo (Lago de Maracaibo)
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
Eight sediment samples from Maracaibo's estuary (Lago de Maracaibo) were assessed for their capacity to sorb different amounts of added phosphate, the results were studied according with the Langmuir, Freundlich and Temkin ...
Competencia entre aniones orgánicos (Malato y oxalato) con ortofosfato por los sitios de adsorción en suelos tropicales
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
The competence between organic anions (oxalate and malate) with orthophosphate for binding places in acidic and calcareous tropical soils was studied. The experiments were performed, combining the presence of the carboxilicacids ...
Evolución estacional de nutrimentos en Pinus radiata
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
The seasonal variation of N, P, K, Ca, Mg, Na, Cu, Mn, Fe y Zn was studied in a 6 years old stand of Pinus radiata D Don. According to the variability of the elements the sampling period was important for K, Ca, Zn, Fe and ...
Tablas de volumen para Eucalyptus camaldulensis en Nicaragua
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
Overbark and underbark double-entry tables for total volume are presented for trees of Eucalyptus camaldulensis in Nicaragua as well as tables to a minimum top diameter of 5 em. Data were collected from a total of 61 trees ...
Aluminio activo en suelos derivados de cenizas volcánicas de Costa Rica y Guatemala
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
Active aluminum extracted with 0.2 M ammonium oxalate, pH 30, and 4 M KOH of 51 samples of Andepts of Costa Rica and Guatemala was quantified and compared. Acid-oxalate extractable alumimum varied from 0.02 to 5.45 while ...
Efecto del blasticidin en el control del virus del mosaico del tabaco
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
The inhibiting effect of Blasticidin on Tobacco Mosaic Virus (TMV) was studied Doses of 10, 1, 0.1 and 0.01 ppm were used to estimate the amount of product useful to determine inhibition of the virus. The product was applied ...
Actividad citoquinina y efecto de la nutrición nitrogenada en el desarrollo de raíces tuberosas de Ipomoea batatas
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
The relationship between tuberization induced by a period of nitrogen withdrawal and the cytokinin activity in roots, shoots and xylem exudate was investigated in water cultured plants of sweet potato (lpomoea batatas ...
Entomofauna asociada a Passiflora mollisima, P. edulis f. flavicarpa y P. quadrangularis en el Departamento del Valle del Cauca
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1984-07)
This work contributes to the knowledge of the insect fauna associated with crops of Passiflora mollissima, P. edulis f. Flavicarpa y P quadrangularis in the Department of Valle del Cauca, Colombia. For each species of ...