IPI International Potash Institute
IPI International Potash Institute

Research Findings: e-ifc No. 41, June 2015

Symptoms of K deficiency on potato plant development in the field. Photo by W. Grzebisz.

Potassium as a Factor Driving Nitrogen Use Efficiency - The Case for Potatoes Cultivated on Light Soil

Grzebisz, W.(1), W. Szczepaniak(1), M. Biber(1), and K. Przygocka-Cyna(1)
print version pdf download pdf 1.41 MB

(1)Poznan University of Life Sciences, Department of Agricultural Chemistry and Environmental Biogeochemistry, Poland
Corresponding author: witegr@up.poznan.pl

Abstract

Potassium (K) is generally considered as a nutrient which significantly affects nitrogen use efficiency (NUE). This relationship was tested in a field experiment with rain-fed potatoes cultivated on a light soil. The experiment consisted of four K doses: 0, 80, 160, or 240 kg K2O ha-1 and two N doses: 120 or 160 kg N ha-1. The effect of residual K was tested against the background of 90 kg K2O ha-1 applied to winter wheat sown consecutively. Potato yields responded positively to increasing K dose, especially in 2013, a year characterized by mild water stress in the summer months. A positive impact of K application on tuber yields was obtained in relation to the increased N dose. The harvested tuber yield showed a linear response to increasing N uptake but curvilinear to increasing K uptake, with an optimum at 170 kg K ha-1. Thus, potato fertilized with 160 K2O ha-1 and with 160 kg N ha-1 reached highest productivity. However, the most efficient use of applied nutrients, as demonstrated by analyses of the agronomic index of NUE, was a fertilizer combination of 160 K2O ha-1 and 120 kg N ha-1. Elevated amounts of K fertilizer resulted in some increase of the soil K available pool. This pool in 2013, following the 2012 potato crop, was high enough to significantly increase the productivity of the consecutive winter wheat, but a similar effect did not occur in the winter of 2014.

No seu idioma

Choose your Crop

Choose your App
IPI research e-ifc app for iPad and iPhone available now from the Apple App Store
IPI Research App for Android and Apple phones and tablets.

Infographics
The Role of Potassium (K) in the Plant (in Urdu)
Potassium and Nitrogen Use Efficiency (NUE) in Urdu
Potassium in Soil and Plant Systems (in Urdu)
IPI profile infographic
Chloride - an essential nutrient
Potassium and Nitrogen Use Efficiency (NUE)
Managing Water and Fertilizer for Sustainable Agricultural Intensification - infographic
Potassium Improves your Crop Quality
Potassium Improves your Health
Potassium in Soil and Plant Systems
The Role of Potassium (K) in the Plant
What does a Plant Need to Live
Assessment of the Impact of Targeted Use of Fertilizer on Irrigated Rice in Asia
The Role of Potassium (K) in the Plant (in Urdu)

New publication