Potassium fertilization: paradox or K management dilemma?

A - Papers appearing in refereed journals

Bar-Yosef, B., Magen, H., Johnston, A. E. and Kirkby, E. A. 2015. Potassium fertilization: paradox or K management dilemma? Renewable Agriculture And Food Systems. 30 (2), pp. 115-119. https://doi.org/10.1017/S1742170514000295

AuthorsBar-Yosef, B., Magen, H., Johnston, A. E. and Kirkby, E. A.

In 2014, Khan et al. presented evidence that soil exchangeable K (Exch-K) increases over time without addition of potassium (K) to the soil despite the removal of K in crops on a soil rich in montmorillonite and illite. The authors term this behavior ‘The potassium paradox’. From their review of the literature, the authors also report a lack of crop response to potassium chloride (KCl) fertilization. Close evaluation of these findings reveals that their observations can be interpreted and predicted using current knowledge of K in soil chemistry and its uptake by plants, and there is no paradox in K behavior in the soil–plant system. There is also no evidence of a detrimental effect of KCl on crop yield or quality. Their conclusion that the widely used Exch-K soil test is inadequate for managing K fertilization is discussed and some possible modifications to improve its performance are included. We believe that measurement of Exch-K is an essential and valuable tool and its use should be continued, along with improvements in recommending K fertilizer application.

Year of Publication2015
JournalRenewable Agriculture And Food Systems
Journal citation30 (2), pp. 115-119
Digital Object Identifier (DOI)https://doi.org/10.1017/S1742170514000295
Open accessPublished as ‘gold’ (paid) open access
Publisher's version
Copyright license
All rights reserved
File Access Level
Output statusPublished
Publication dates
Online18 Feb 2015
Publication process dates
Accepted17 Jul 2014
PublisherCambridge University Press (CUP)

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