University of Khartoum

Calculation of K Uptake by Three Crops Grown Under Controlled Conditions Using a Mechanistic Model

Calculation of K Uptake by Three Crops Grown Under Controlled Conditions Using a Mechanistic Model

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dc.contributor.author El Dessougi, Hanadi I.
dc.contributor.author Claassen, Norbert
dc.date 2011
dc.date.accessioned 2015-12-20T11:56:55Z
dc.date.available 2015-12-20T11:56:55Z
dc.date.issued 2015-12-20
dc.date.submitted 2015
dc.identifier.uri http://khartoumspace.uofk.edu/handle/123456789/17894
dc.description.abstract The aim of this study was to compare simulated and actual K uptake by three crops, under different K concentrations in the soil solution, in order to try to explain the underlying mechanisms of nutrient uptake by these crops. In 2002, wheat (Triticum aestivum L. cv. Star), barley (Hordeum vulgare L. cv. Madras) and sugar beet (Beta vulgaris L. cv. C+ T) were grown on a sandy clay loam, with various K concentrations in soil solution, in the growth chamber at the Institute of Agricultural Chemistry, University of Goettingen, Germany. Data were collected on K transport in soil and uptake by the three crops and used for simulation by a mechanistic model which encompasses uptake by root hairs as well. To quantify the significance of single soil and plant parameters for nutrient uptake, a sensitivity analysis was carried out. Under sufficient K in the soil solution, where transport was not limiting uptake, the model predicted the actual K uptake correctly. At deficient K concentrations, the model over-predicted the K uptake by both wheat and barley but under-predicted that of sugar beet. The calculated concentration profiles around the roots showed that for cereals wrong values of the uptake kinetics caused the over-prediction of K uptake, whereas for sugar beet some processes more than was considered by the model took place. en_US
dc.publisher university of khartoum en_US
dc.subject Mechanistic model; uptake kinetics; sugar beet; wheat; barley en_US
dc.title Calculation of K Uptake by Three Crops Grown Under Controlled Conditions Using a Mechanistic Model en_US
dc.type Publication en_US
dc.Faculty Agriculture en_US

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