Potassium impact on nitrogen use efficiency in potato - a case study from the Central-East Europe

Witold Grzebisz, Pavel Čermák, Evan Rroco, Witold Szczepaniak, Jarosław Potarzycki and György Füleky
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Witold Grzebisz: Poznan University Life Sciences, Poznan, Poland
Pavel Čermák: Crop Research Institute, Prague, Czech Republic
Evan Rroco: Agricultural University of Tirana, Tirana, Albania
Witold Szczepaniak: Poznan University Life Sciences, Poznan, Poland
Jarosław Potarzycki: Poznan University Life Sciences, Poznan, Poland
György Füleky: Szent István University, Gödöllő, Hungary

Plant, Soil and Environment, 2017, vol. 63, issue 9, 422-427

Abstract: Potato yield is affected by an interaction between nitrogen (N) and potassium (K) supply. This hypothesis was verified in a series of field experiments conducted during 2010-2013 in Albania (AL), Czech Republic (CZ) and Poland (PL). The two-factorial experiment was founded on relative scales of K (0, 50, 100, and 150%), and N application rates (75% and 100%) of the recommended doses, which were country-specific. The average tuber yield was doubled for AL, increased by 50% for PL, and by 15% for the CZ in response to K and N interaction. These differences are caused by an increase in the apparent nitrogen efficiency (ANE), which rose significantly by the progressive Krates. Maximum average ANE of 90 kg tubers/kg N was recorded in AL; it was 2-fold lower in CZ. Top average apparent potassium efficiency (AKE) of 65 kg tubers/kg K was recorded in PL; it was 4-times lower in CZ. The relationships between AKE and ANE clearly demonstrate the tight interaction between the N and K, and its effects on potato yield. However, a sound K application management should be adjusted to the local edaphic and climatic conditions.

Keywords: partial factor productivity of N fertilizer; yield gap; Solanum tuberosum L (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:63:y:2017:i:9:id:344-2017-pse

DOI: 10.17221/344/2017-PSE

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