RESIDUES OF FORAGE SPECIES AFFECT PHOTOSYNTHETIC CHARACTERISTICS OF THE PEQUIZEIRO

Authors

  • Alana Cristina Ferreira Araújo Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO
  • João Carlos Madalão Biological and Agricultural Science Department, Universidade Federal do Espírito Santo, São Mateus, ES
  • Adriano Jakelaitis Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO
  • Alan Carlos Costa Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO
  • Gabriel Martins Almeida Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO

DOI:

https://doi.org/10.1590/1983-21252018v31n102rc

Keywords:

Allelopathy. Melinis minutiflora. Paspalum notatum. Photosynthetic rate. Urocholoa decumbens.

Abstract

Some forages release allelopathic substances into the environment, and may prevent consortium with arboreal species in pastures. The objective of this work was to evaluate photosynthetic characteristics of pequizeiro plants (hereafter pequi) influenced by concentrations of residues of the forage species Urocholoa decumbens, Melinis minutiflora and Paspalum notatum. The treatments consisted of pequi cultivation under aerial residues of the three forage species mixed to the substrate in four concentrations (1, 2, 3 and 4% mass/mass), plus an additional treatment (comparative control) with pequi cultivated on the substrate without waste. The following parameters were evaluated: photosynthetic rate, stomatal conductance, transpiration rate, relationship between internal and external CO2 concentration (Ci/Ca), maximum quantum yield, effective quantum yield of FS II, electron transport rate, nonchemical quenching and chlorophyll index, concerning the content of chlorophyll a, b and total in pequi plants at 50 and 100 days after transplanting (DAT), and the relative production of dry matter at 100 DAT. At 50 DAT, the following photosynthetic variables were affected in pequi plants: A, gs, chlorophyll a, chlorophyll b and total chlorophyll when cultivated in the presence of forage residues. At 100 DAT, the following photosynthetic variables were affected in pequi plants: A, Fv/Fm, ETR, NPQ, chlorophyll a, chlorophyll b and total chlorophyll, when cultivated in the presence of forage residues. Pequi plants had reduced relative dry matter yield when grown in the presence of U. decumbens. This variable was also affected when pequi was grown in increasing concentrations of residues of the species U. decumbens, M. minutiflora and P. notatum.

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Author Biographies

Alana Cristina Ferreira Araújo, Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO

Graduanda em Agronomia

João Carlos Madalão, Biological and Agricultural Science Department, Universidade Federal do Espírito Santo, São Mateus, ES

Eng. Agrônomo, Dr. em Fitotecnia

Adriano Jakelaitis, Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO

Eng. Agrônomo, Dr. em Fitotecnia

Alan Carlos Costa, Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO

Ciências Agrícolas, Dr. em Fisiologia Vegetal

Gabriel Martins Almeida, Department of Phytotechnology, Instituto Federal Goiano, Rio Verde, GO

Graduando em Agronomia

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Published

11-12-2017

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Section

Agronomy