Rate of Uptake of Potassium by Three Crop Species in Relation to Growth
- 1 August 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 29 (4) , 885-894
- https://doi.org/10.1093/jxb/29.4.885
Abstract
Barley, ryegrass, and fodder radish were grown in flowing nutrient solutions at four potassium concentrations, [Ke+], from 0.05 to 4 mg I−1. During the first 2 weeks after germination the response to [Ke+] (fodder radish > barley > ryegrass) depended on the potential relative growth rate, the ratio of root surface area to plant weight, and on the K+ flux into the roots. Subsequently, there was no effect of [Ke+] on growth rate within the range tested. The K+ flux decreased from 4–23 × 10−12 mol cm−2 s−1 in the first 2 weeks after germination, when it was concentration-dependent, to 2–5 × 10−12 mol cm−2 s−1 after 4–5 weeks, when it became independent of [Ke+] down to 0.05 mg 1−1. The results explain the importance of high [Ke+] and rapid root growth during the first 2 weeks after seed germination.This publication has 1 reference indexed in Scilit:
- Comparison of Potassium Uptake by Four Plant Species Grown in Sand and in Flowing Solution CultureJournal of Applied Ecology, 1974