Portable chlorophyll meter can estimate the nitrogen sufficiency index and levels of topdressing nitrogen in common bean

Authors

  • Pedro Marques da Silveira Embrapa Arroz e Feijão. Rodovia GO 462, km 12, zona rural. Santo Antônio de Goiás- GO. CEP 75.375.000
  • Augusto Cesar de Oliveira Gonzaga Embrapa Arroz e Feijão. Rodovia GO 462, km 12, zona rural. Santo Antônio de Goiás- GO. CEP 75.375.000

DOI:

https://doi.org/10.5216/pat.v47i1.42128

Keywords:

Phaseolus vulgaris, nitrogen fertilization, SPAD-502.

Abstract

The nitrogen sufficiency index (NSI) obtained by using a portable chlorophyll meter is a practical alternative to evaluate the N levels in plants. This study aimed at determining the appropriate NSI value for leaves of common bean plants, in order to define the need and amount of N to be applied as topdressing, using the Minolta SPAD-502 portable chlorophyll meter. Three field experiments were conducted using a randomized blocks design, with four replications. Nitrogen doses were applied as topdressing and compared with a treatment in which a high dose of N was used as a reference to calculate the NSI, whose value was 95 %. According to the results observed using the chlorophyll meter and the NSI, for each 0.1 percentage point increase in the NSI to reach the adequate level (95 %), it is necessary to apply 1.1-1.5 kg ha-1 of topdressing N.

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Author Biographies

  • Pedro Marques da Silveira, Embrapa Arroz e Feijão. Rodovia GO 462, km 12, zona rural. Santo Antônio de Goiás- GO. CEP 75.375.000
    Possui graduação em Agronomia pela Universidade Federal de Viçosa (1973) , mestrado em Engenharia Agrícola pela Universidade Federal de Viçosa (1976) e doutorado em Agronomia (Solos e Nutrição de Plantas) pela Universidade Federal de Viçosa (1986) . Atualmente é PESQUISADOR da Empresa Brasileira de Pesquisa Agropecuária e Professor Convidado da Universidade Federal de Goiás. Tem experiência na área de Engenharia Agrícola , com ênfase em Engenharia de Água e Solo. Atuando principalmente nos seguintes temas: Aeracao do Solo, Drenagem, Drenagem Interna, Excesso de Agua, Feijao e Manejo da Irrigacao.
  • Augusto Cesar de Oliveira Gonzaga, Embrapa Arroz e Feijão. Rodovia GO 462, km 12, zona rural. Santo Antônio de Goiás- GO. CEP 75.375.000
    Possui graduação em Agronomia pela Universidade Federal de Goiás. Atua na área de transferência de tecnologia.

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Published

2017-01-20

Issue

v. 47, n. 1, Jan./Mar. 2017

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

SILVEIRA, P. M. DA; GONZAGA, A. C. DE O. Portable chlorophyll meter can estimate the nitrogen sufficiency index and levels of topdressing nitrogen in common bean. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 47, n. 1, p. 1–6, 20 Jan.2017.