Hydrocyanic acid content in cassava tissues as a function of evaluation time and nitrogen fertilization

Authors

  • Natália Trajano de Oliveira Universidade Federal de Roraima (UFRR)
  • Sandra Cátia Pereira Uchôa UFRR, Centro de Ciências Agrárias, Departamento de Solos e Engenharia Agrícola
  • José Maria Arcanjo Alves UFRR, Centro de Ciências Agrárias, Departamento de Fitotecnia
  • Tocio Sediyama Universidade Federal de Viçosa (UFV),Departamento de Fitotecnia
  • José de Anchieta Alves de Albuquerque UFRR, Centro de Ciências Agrárias, Departamento de Fitotecnia
  • Everton Diel Souza Embrapa Roraima
  • Cirano Cruz Melville UFRR, Graduação em Agronomia, Campus do Cauamé, BR 174 s/n, Monte Cristo, CEP 69304-000 Boa Vista, RR.

DOI:

https://doi.org/10.1590/S1678-3921.pab2012.v47.12803

Keywords:

Manihot esculenta, cyanogenic glycosides, linamarin, lotaustralin

Abstract

The objective of this work was to evaluate hydrocyanic acid contents in cassava plants, according to the evaluation time and nitrogen fertilization. A randomized complete block design was used in a split‑plot arrangement, with four replicates. Nitrogen topdressing doses (0, 30, 60, 150, and 330 kg ha-1) were allocated in the plots, and the evaluation times (90, 120, 150, 180, 240, 300, and 360 days after planting), in the subplots. Hydrocyanic acid content was evaluated on leaf tissue, stalk, pulp, and root skins of the Aciolina cultivar. The effects of N doses and harvest times were independent. Nitrogen levels between 219 and 241 kg ha-1 provide the highest hydrocyanic acid contents, varying from 332 to 401 mg kg-1 of fresh matter in the evaluated tissues. Prolonging the evaluation time linearly reduces the hydrocyanic acid content in the tissues. Root skins accumulate the highest level of hydrocyanic acid, and the root pulp the lowest. At harvest, 360 days after planting, this cultivar is classified as sweet cassava.

Author Biographies

Sandra Cátia Pereira Uchôa, UFRR, Centro de Ciências Agrárias, Departamento de Solos e Engenharia Agrícola

Professora Doutora

José Maria Arcanjo Alves, UFRR, Centro de Ciências Agrárias, Departamento de Fitotecnia

Professor Doutor

Tocio Sediyama, Universidade Federal de Viçosa (UFV),Departamento de Fitotecnia

Professor Doutor

José de Anchieta Alves de Albuquerque, UFRR, Centro de Ciências Agrárias, Departamento de Fitotecnia

Professor Doutor

Everton Diel Souza, Embrapa Roraima

Pesquisador Doutor

Cirano Cruz Melville, UFRR, Graduação em Agronomia, Campus do Cauamé, BR 174 s/n, Monte Cristo, CEP 69304-000 Boa Vista, RR.

Estudante de Agronomia, bolsista Pet-agro

Published

2012-11-29

How to Cite

Oliveira, N. T. de, Uchôa, S. C. P., Alves, J. M. A., Sediyama, T., Albuquerque, J. de A. A. de, Souza, E. D., & Melville, C. C. (2012). Hydrocyanic acid content in cassava tissues as a function of evaluation time and nitrogen fertilization. Pesquisa Agropecuaria Brasileira, 47(10), 1436–1442. https://doi.org/10.1590/S1678-3921.pab2012.v47.12803

Issue

Section

CROP SCIENCE