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Potato Research

, Volume 53, Issue 3, pp 167–179 | Cite as

Economic Optimum Nitrogen Fertilization Rates and Nitrogen Fertilization Rate Effects on Tuber Characteristics of Potato Cultivars

  • Paulo C. R. FontesEmail author
  • Heder Braun
  • Camilo Busato
  • Paulo R. Cecon
Article

Abstract

The objective of the research was to determine the economic optimum nitrogen (N) fertilization rates and to determine the effects of N fertilization rates on tuber characteristics and fresh mass loss after storage under cold and ambient conditions of four potato cultivars, Ágata, Asterix, Atlantic, and Monalisa. The experiments were, simultaneously, conducted in the same area and similar experimental conditions during the fall/winter period in Viçosa, Minas Gerais State, Brazil. In each experiment, five N fertilization rates (0, 50, 100, 200, 300 kg ha−1) were evaluated in a randomized complete block design. For all cultivars, increasing N fertilization rate increased total and marketable yields and tuber dry matter yield up to a maximum following a quadratic model. Increasing N fertilization rate linearly increased the tuber protein concentration of Atlantic and Monalisa and had no effect on tuber pH. N fertilization rate effects on tuber mass, tuber titratable acidity, and fresh mass loss during storage were cultivar-dependent. N use efficiency (tuber yield divided by N fertilization rate) decreased with increase in N fertilization rate. The economic optimum N fertilization rates ranged from 147 to 201 kg ha−1 depending upon cultivar and relative prices of N and potato tubers. Depending on the cultivar, under favorable price conditions (low N price and high tuber price), the economic optimum N fertilization rates to be applied by potato growers were 92–95% of the estimated N fertilization rate for obtaining the maximum potato yield, whereas under unfavorable conditions (high N price and low potato tuber price) the economic optimum N fertilization rates to be applied should be decreased to 86–92% of the rates for maximum yield.

Keywords

Fertilizer Profitable rate Solanum tuberosum L. Tuber quality 

Notes

Acknowledgments

This research was partially supported by the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), Brazil. The authors thank Conselho Nacional de Pesquisa (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil, for the scholarships.

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Copyright information

© EAPR 2010

Authors and Affiliations

  • Paulo C. R. Fontes
    • 1
    Email author
  • Heder Braun
    • 1
  • Camilo Busato
    • 2
  • Paulo R. Cecon
    • 3
  1. 1.Departamento de FitotecniaUniversidade Federal de ViçosaViçosaBrazil
  2. 2.Instituto de Defesa Agropecuária e Florestal do Espírito SantoColatinaBrazil
  3. 3.Departamento de InformáticaUniversidade Federal de ViçosaViçosaBrazil

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