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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

The effects produced by water stress and three relative humidity (R.H) levels (3q-53%, 5461% & 62-82%) were measured on photosynthesis, stomatal conductance and transpiration rate. Stomatal opening and density were measured in stressed and non stressed plants of plantain (Dominico-Harton) and ora...


Cayón Gutiérrez, Manuel GerardoEl-Sharkawy, Mabrouk A.Mejía de Tafur, María Sara[Efectos fisiológicos del estrés hídrico sobre varias especies vegetales. II. Naranja y plátano]Efectos fisiológicos del estrés hídrico sobre varias especies vegetales. II. Naranja y plátano

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

Analysis of previously published data shows that an extremely close correlation (r(2) = 0.83) exists between stomatal sensitivity to changes in leaf to air vapor pressure deficit and the maximum leaf conductance at low VPD in a wide range of plant species. The hypothesis is presented that stomata...


El-Sharkawy, Mabrouk A.Cock, James H.[Stomatal sensitivity to air humidity : a hypothesis for its control through peristomatal evaporation]Stomatal sensitivity to air humidity : a hypothesis for its control through peristomatal evaporation

Although cassava -a tropical crop- is regarded as a staple food crop for millions of people worldwide, it is still considered as a subsistence crop and seldom receives adequate crop management. Average yields are less than 8 t/ha. Colombia`s North Coast, where large areas of sandy soils are plant...


Cadavid López, Luis FernandoAcosta, AlvaroEl-Sharkawy, Mabrouk A.[Efecto de preparación mulch y abonamiento en el cultivo de la yuca (Manihot esculenta Crantz) en suelos arenosos de Colombia]Efecto de preparación mulch y abonamiento en el cultivo de la yuca (Manihot esculenta Crantz) en suelos arenosos de Colombia

El-Sharkawy, Mabrouk A.Mejía de Tafur, María SaraLópez, Yamel[Cassava productivity, photosynthesis, ecophysiology, and response to environmental stresses in the tropics:A multidisciplinary approach to crop improvement and sustainable production]Cassava productivity, photosynthesis, ecophysiology, and response to environmental stresses in the tropics:A multidisciplinary approach to crop improvement and sustainable production

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

As cassava is grown mostly by small resource-limited farmers throughout the tropics on low-fertility soils with little fertilization and, due to the large potassium (K) export in harvested roots, genotypes that tolerate low-K soils and respond to K fertilization are warranted. The objective of th...


El-Sharkawy, Mabrouk A.Cadavid López, Luis Fernando[Genetic variation within cassava germplasm in response to potassium]Genetic variation within cassava germplasm in response to potassium

Four contrasting varieties of cassava (Manihot esculenta Crantz) were grown for ten months over two consecutive seasons in hillside Colombia with or without nitrogen, phosphorus and potassium fertilization. Sequential harvests were every two months. The two varieties well adapted to acid soils (C...


Pellet, DEl-Sharkawy, Mabrouk A.[Cassava varietal response to fertilization: Growth dynamics and implications for cropping sustainability]Cassava varietal response to fertilization: Growth dynamics and implications for cropping sustainability
El-Sharkawy, Mabrouk A.[Prospects of photosynthetic research for increasing agricultural productivity, with emphasis on the tropical C4 Amaranthus and the cassava C3-C4 crops]Prospects of photosynthetic research for increasing agricultural productivity, with emphasis on the tropical C4 Amaranthus and the cassava C3-C4 crops

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