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Growth and N uptake in pot-grown maize, beans, and cassava were evaluated under 2 levels of soil N at CIAT-Palmira (Colombia). The lower amount of the element reduced its uptake by the 3 species, resulting in lower tissue concn., especially in the leaves. Under low N, DM accumulation was also red...


Porto, M.C.M.El-Sharkawy, Mabrouk A.Cock, James H.Hernández, A. del P.Cadena, G. de[Crescimento, fotossintese e eficiencia do uso de nitrogenio em milho, feijao e mandioca submetidos a dois niveis de N no solo]Crescimento, fotossintese e eficiencia do uso de nitrogenio em milho, feijao e mandioca submetidos a dois niveis de N no solo

El-Sharkawy, Mabrouk A.Cock, James H.[The humidity factor in stomatal control and its effect on crop productivity]The humidity factor in stomatal control and its effect on crop productivity

Different physiological characteristics of the cassava plant, which can be used as selection parameters, are reviewed, namely LAI, HI, biomass production, plants with amphistomatic leaves, and C4 photosynthesis. Experience indicates that it is better to select var. showing lower yield reduction u...

Se revisan diferentes caracteristicas fisiologicas de la planta de yuca que se pueden utilizar como parametros de seleccion: IAF, IC, produccion de biomasa, plantas con hojas amfistomatosas y fotosintesis C4. Se enfatiza que se debe tratar de seleccionar var. que presenten menor disminucion en co...


Cock, James H.El-Sharkawy, Mabrouk A.[Caracteristicas fisiologicas para la seleccion de yuca]Caracteristicas fisiologicas para la seleccion de yuca

In recent studies of cassava at CIAT, net CO2 uptake rates of 20 to 35 ?mol CO2 m?2 s?1 were commonly observed. Cassava photosynthesis has a high optimum temperature (35°C) and a wide plateau (25 to 35°C) corresponding to the temperature range under which cassava is cultivated. Leaf photosynthesi...


El-Sharkawy, Mabrouk A.Cock, James H.[Photosynthesis of cassava (Manihot esculenta)]Photosynthesis of cassava (Manihot esculenta)

To determine the presence of Kranz anatomy, chloroplast structure and distribution in cassava leaf tissues, a selection was made among materials of CIAT`s germplasm bank. Two materials were selected, var. MCol 22 and hybrid CM 507-37; work was also carried out with maize var. Swan Laposta C48B (m...


Riano, N.M.Cock, James H.López F., Y.El-Sharkawy, Mabrouk A.[Anatomia Kranz, estructura y distribucion de cloroplastos en hojas de yuca (Manihot esculenta Crantz)]Anatomia Kranz, estructura y distribucion de cloroplastos en hojas de yuca (Manihot esculenta Crantz)

Cassava, bean, and maize leaves were fed with (14)CO2 in light; the primary products of photosynthesis were identified 5 and 10 s after assimilation. In cassava, approx. 40-60 percent were incorporated in C4 acids with 30-50 percent in phosphoglyceric acid, which indicates that cassava possesses ...


Riano, N.M.Cock, James H.López F., Y.El-Sharkawy, Mabrouk A.Bastidas, G.[Caracteristicas fotosinteticas de la yuca (Manihot esculenta Crantz): Productos iniciales de fijacion con (14)CO2]Caracteristicas fotosinteticas de la yuca (Manihot esculenta Crantz): Productos iniciales de fijacion con (14)CO2

This audiotutorial unit (cassette, printed script, 76 color slides, study guide, self-evaluation test), prepared by the Communications Support Unit at CIAT, is available for use with a manually or automatically synchronized slide projector/cassette tape reccorder. Each unit is a vailabIe from the...

Esta unidad audiotutorial (cinta magnetofonica, guion, 76 transparencias a color, guia de estudio, auto-evaluacion), preparada por la Unidad de Comunicaciones del CIAT, esta disponible para usarla en sincronizacion automatica o manual por medio de un proyector de transparencias o una grabadora de...


Cock, James H.Domínguez O., Carlos E.Ceballos L., Luis FernandoArregocés, Oscar[Un tipo ideal de planta de yuca para rendimiento máximo [conjunto audiotutorial]]Un tipo ideal de planta de yuca para rendimiento máximo [conjunto audiotutorial]

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