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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

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

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

Cassava (Manihot esculenta Crantz) is a staple food for a large sector of human population in the tropics. It is widely produced for its starchy roots by small farmers over a range of environments on poor infertile soils with virtually no inputs. It is highly productive under favorable conditions...


El-Sharkawy, Mabrouk A.Cock, James H.[Response of cassava to water stress]Response of cassava to water stress

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

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