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El trabajo de campo se llevó a cabo en dos localidades de la costa Atlántica Colombiana, Riohacha en la Guajira, considerada como zona semi-arida y Santo Tomás Atlántico, como zona sub-húmeda. La respuesta a la humedad relativa se evaluó en diez cultivares, entre las 8 y las 13 horas empleando un...


Mejia de Tafur, MSEl-Sharkawy, Mabrouk A.Cantillo, S.H. de[Respuesta fotosintética de la yuca (Manihot esculenta Crantz) en dos ambientes]Respuesta fotosintética de la yuca (Manihot esculenta Crantz) en dos ambientes

Se estudió el cambio en el contenido nutricional de los tallos de yuca ocasionado por diferentes niveles de fertilización al suelo y el efecto de las estacas obtenidas de esos tallos sobre el cultivo subsiguiente. Los 9 niveles nutricionales del suelo incidieron en la altura y vigor de las planta...


López Molina, J.El-Sharkawy, Mabrouk A.López, Y.[Fertilidad del suelo y calidad nutricional de estacas de yuca (Manihot esculenta Crantz)]Fertilidad del suelo y calidad nutricional de estacas de yuca (Manihot esculenta Crantz)

Erosion trials under natural rainfall were conducted at two locations in the Andean hillsides of south-west Colombia on moderate slopes. Sediment-bound losses of seven cassava (Manihot esculenta) cropping systems per cropping period ranged from 26 to 1726 kg ha?1 for organic matter, 0.9 to 65.5 k...


Ruppenthal, MLeihner, D.E.Steinmuller, N.El-Sharkawy, Mabrouk A.[Losses of organic matter and nutrient by water erosion in cassava-based cropping systems]Losses of organic matter and nutrient by water erosion in cassava-based cropping systems

Agricultural research and development plays an essential role in a nation's economic development, providing for food security for an ever-increasing population. In developed countries, the gap between potential and actual yield is largely closed because of a combination of advanced technologies, ...


El-Sharkawy, Mabrouk A.[Utility of basic research in plant/crop physiology in relation to crop improvement : A review and a personal account]Utility of basic research in plant/crop physiology in relation to crop improvement : A review and a personal account

Cassava (Manihot esculenta Crantz) is a hot-climate crop that is also grown in cool areas of the highland tropics, where yields are reduced. The purpose of this study was to evaluate the effect of growth temperature on photosynthesis of two cassava cultivars from contrasting habitat and to determ...


El-Sharkawy, Mabrouk A.Mejía de Tafur, MSCadavid López, Luis Fernando[Photosynthesis of cassava and its relation to crop productivity]Photosynthesis of cassava and its relation to crop productivity

We want to understand the physiological mechanisms underlying the high photosynthetic rates of cassava under drought stress and high temperatures. Histological analysis of leaf cross sections with cassava PEPC specific antiserum to establish the enzymic compartmentalization pattem is our next goa...


López F, Y.Vélez, W.El-Sharkawy, Mabrouk A.Mayer, Jorge Edgard[Biochemical characterization of PEPC from cassava: a preliminary report]Biochemical characterization of PEPC from cassava: a preliminary report

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