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

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

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], Goiânia, v. 47, n. 1, p. 1–6, 2017. Disponível em: https://revistas.ufg.br/pat/article/view/42128. Acesso em: 21 nov. 2024.

Issue

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

Section

Research Article

License

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