Effect of Potassium/Rubidium Ratio on the Uptake of Potassium by Jerusalem Artichoke Roots | ||
| Alexandria Science Exchange Journal | ||
| Article 5, Volume 36, January-March - Serial Number 1, January 2015, Pages 32-39 PDF (225.54 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/asejaiqjsae.2015.2736 | ||
| Author | ||
| Said Abbas Mohammed EL-Sayed* | ||
| Soil and Water Sci. Dept., Faculty of Agriculture in Assiut, Al-Azhar University | ||
| Abstract | ||
| A common belief is that plant roots absorb cations from soil solution experiments with corn (Zea mays L.) using K/Rb ratio to evaluate the source of K and Rb absorbed indicated that the plant roots absorbed these ions in the ratio of exchangeable K and Rb. The objective of this research was to study the source of K and Rb absorbed from soil by Jerusalem artichoke (Helianthus tuberosus L.) roots since they do not have root hairs and this may influence the uptake mechanism. Jerusalem artichoke absorbed K/Rb with a ratio which was intermediate between the ratio of exchangeable K and Rb and the ratio of these cations in solutions. In comparison with corn, Jerusalem artichoke absorbed K at one-third the rate, but absorbed water three times faster so that mass flow contributed a greater proportion of K absorbed by Jerusalem artichoke than that by corn. This, rather than differences in root hairs may be the reason for the observed differences in K uptake between corn and Jerusalem artichoke. | ||
| Keywords | ||
| Selectivity coefficient; diffusion coefficient; exchange cations; solution cations; ion influx kinetics; Helianthus tuberosus L | ||
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