Potassium uptake efficiency of potato and wheat in relation to growth in flowing solution culture
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Uptake efficiency (in terms of shoot K content) of potato decreased with time compared to that of wheat at a deficient K level of 1.5 μM. This resulted from the decrease in root-shoot ratio with time for potato only. Both shoot and root growth rates of potato depended on solution K levels in the initial stages and were greater at higher K levels. At optimum K, uptake efficiency of potato increased with time and this was due to the increased K-influx with time. The K concentration of 4–5% in the potato shoot was sufficient to achieve 90% of maximum shoot growth rate. Plants grown at optimum K concentration attained shoot K content of 4–5% rapidly and achieved maximum shoot growth rate faster than those grown at low K concentration.
Additional keywordsK-influx ratio root-shoot
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- Claassen, N., K.M. Syring & A. Jungk, 1986. Verification of a mathematical model by simulating potassium uptake from soil.Plant and Soil 95: 209–220.Google Scholar
- Meyer, D., 1993. Effizienz von Kulturpflanzen bei der Nutzung des nichtaustauschbaren Kaliums von Boden. PhD thesis, Universität Göttingen, Germany.Google Scholar
- Newman, E.J., 1966. A method of estimating the total length of root in a sample.Journal of Applied Ecology 3: 135–145.Google Scholar
- Sadana, U.S. & N. Claassen, 1994. Potassium efficiency of wheat, maize and sugar beet on a sandy clay loam soil. Transactions 15th World Congress of Soil Science, Commission IV, Acapulco, Mexico, Vol. 5b, pp. 383–384.Google Scholar
- Trehan, S.P. & N. Claassen, 1998. External K requirement of young plants of potato, sugar beet and wheat in flowing solution culture resulting from different internal requirements and uptake efficiency.Potato Research 41: 229–237.Google Scholar
- Woodhouse, P.J., A. Wild & C.R. Clement, 1978. Rate of uptake of potassium by crop species in relation to growth.Journal of Experimental Botany 29(III): 885–894.Google Scholar