Type: Chapter

Advances in optimizing potassium-use efficiency in crop production


Kaushik Majumdar

African Plant Nutrition Institute (Morocco)

Meenu Rani

formerly ICAR-Indian Institute of Farming Systems Research (India)

T. Scott Murrell

African Plant Nutrition Institute (Morocco)

Sudarshan Dutta

African Plant Nutrition Institute (Morocco)

T. Satyanarayana

formerly International Plant Nutrition Institute (India)

V. K. Singh

ICAR-Indian Agricultural Research Institute (India)


Publication date:

17 February 2020

ID: 9781786766557

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Potassium-use efficiency (KUE) is the outcome of a complex interaction among crop internal physiology, the environment and the management practices imposed on the production system. Four metrics of KUE are discussed: partial factor productivity (PFPK), partial nutrient balance (PNBK), agronomic efficiency (AEK), and recovery efficiency (REK). The chapter also explores genetic modifications to increase KUE by either improving the efficiency of K acquisition from the soil, improving the efficiency with which K is used by the plant to produce harvestable biomass, or both. The chapter also reviews management of K inputs, such as fertilizer form, fertilizer rate, fertilizer placement and application timing, all of which can all affect KUE. Crop management also impacts KUE. Both intra- and interspecic variations in KUE exist, and it may be possible to sequence crops in such a way that species with greater access to non-exchangeable soil K may increase the exchangeable soil K supply and thereby benefit crops with less access to non-exchangeable K.

Table of contents

1 Introduction
2 Potassium dynamics in soils
3 Potassium fertilizer use
4 Assessing potassium-use efficiency (KUE)
5 Improving potassium-use efficiency through breeding
6 Partitioning of potassium to reproductive plant organs
7 Fertilizer management to improve potassium-use efficiency
8 Crop management strategies
9 Conclusion
10 References