Nitrogen fertilization and leaf sampling criteria potato crop

  • Fabio Olivieri de Nobile Centro Universitário da Fundação Educacional de Barretos - UNIFEB
  • Renato Mello Prado Universidade Estadual Paulista
  • Thais Botamede Spadoni Centro Universitário da Fundação Educacional de Barretos - UNIFEB
Keywords: Solanum tuberosum, leaf diagnosis, plant nutrition

Abstract

The present study aimed to determine which leave will be displayed and the time of collection of this leave. The treatments consisted on five doses of nitrogen, four times for collection sampling and three types of leaves, arranged in a randomized block design with three repetitions, totalizing one hundred and forty-four experimental units. The leaves collections took place every fifteen days at thirty, forty-five, sixty and seventy five days after budbreak (DAB), collecting the laminated / compound young leaf (first leave), newly mature (second leave) and the mature leave (third leave) from the set of terminal leaflets. For this was installed an experiment with the culture of potato (cv. Atlantic), in Barretos/SP, the period of march the june of 2010. According to this data collected in this study, the best time for collecting the leaves is at 30 days after the budbreak of the potato cultivation containing nitrogen concentrations in the leaves minus heterogeneous of plants from a fraction to another and with values R2 = 0.98 being higher to the all times of harvests. To the diagnostic leaf, the highest determination coefficient was observed in the newly mature (second leaf) with R2 = 0.98. It can be observed that the highest levels of nitrogen were found on the first leaf (39.01 kg-1). Nevertheless, the values were very heterogeneous and did not fit the curve being the second leave (newly mature) the one that best represents the nutritional status of the plant. Therefore the recommendation for nutritional diagnosis will collect the recently matured leaves (2nd leaf) 30 days after budbreak.

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Author Biographies

Fabio Olivieri de Nobile, Centro Universitário da Fundação Educacional de Barretos - UNIFEB
Deaprtamento de Agronomia, área de Fertilidade do solo e Adubação de Culturas
Renato Mello Prado, Universidade Estadual Paulista
Professor Adjunto, Departamento de Solos, área de Nutrição de Plantas
Thais Botamede Spadoni, Centro Universitário da Fundação Educacional de Barretos - UNIFEB
Graduanda em Engenharia Agronômica
Published
30-03-2012
How to Cite
de Nobile, F., Prado, R., & Spadoni, T. (2012). Nitrogen fertilization and leaf sampling criteria potato crop. Comunicata Scientiae, 3(1), 23-29. https://doi.org/10.14295/cs.v3i1.76
Section
Original Article