Mechanisms of potassium uptake efficiency and dynamics in the rhizosphere of safflower and sunflower in different soils

Date
2019-08-20
Authors
Abbadi, Jehad
Dittert, Klaus
Steingrobe, Bernd
Claassen, Norbert
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis
Abstract
Potassium uptake efficiency of safflower and sunflower was studied under semi-controlled conditions in loamy and sandy soils. Both species performed better in loamy soil. Safflower had higher agronomic efficiency and higher relative root length under suboptimal K supply. Safflower had higher specific root density and less root radius at all K levels. Safflower had higher relative root-shoot ratio under suboptimal K in loamy soil. Both species had similar K-influx at low and optimal K in loamy soil, while sunflower had higher influx under suboptimal and optimal supplies in sandy soil. Safflower had higher shoot demand in both soils under suboptimal and optimal K. Both species depleted similar amounts of soil solution-K under suboptimal K in sandy soil, while sunflower was more efficient under suboptimal levels in loamy soils. Sunflower depleted more extractable-K under both suboptimal and optimal K. Safflower could be considered K-uptake efficient crop.
Description
Keywords
alternative crops, Carthamus tinctorius, K influx, potassium uptake efficiency, rhizosphere, safflower, shoot demand
Citation
Jehad Abbadi, Klaus Dittert, Bernd Steingrobe & Norbert Claassen (2019): Mechanisms of potassium uptake efficiency and dynamics in the rhizosphere of safflower and sunflower in different soils, Journal of Plant Nutrition,