Nitrogen doses and sources applied as top-dressing in onion crops grown under no-tillage and conventional tillage systems

Autores

  • Leandro Hahn Epagri
  • Claudinei Kurtz Epagri
  • Analice Ferlin Grazziotin Epagri
  • Andressa Mariani Bee Epagri
  • Anderson Luiz Feltrim Epagri
  • Rafael Goulart Machado Instituto de Assistência Técnica e Extensão Rural (EMATER)

Palavras-chave:

Allium cepa;, urea;, calcium nitrate;, ammonium nitrate, ammonium sulfate.

Resumo

Nitrogen (N) fertilization effectiveness in onion depends on N source, as well as on soil type and management system. The aim of the study is to investigate the effect of N sources and doses applied as top-dressing on bulb yield, leaf N contents and on the postharvest conservation of onion bulbs grown under no-tillage (NTS) and conventional tillage (CTS) systems. Three experiments were carried out: two in Lebon Régis County-SC, under NTS; and one in Caçador County-SC, under CTS. The herein tested N sources comprised urea, ammonium nitrate, calcium nitrate and ammonium sulfate, in combination to N doses applied as top-dressing (70, 140, 210, 280 and 350 kg N ha-1) in addition to the control, without N. The N sources did not affect yield parameters, leaf N content and post-harvest onion losses. The maximum technical efficiency in bulb yield was observed at N doses of 195.8 and 258.4 kg ha-1 in the no-tillage system (NTS) and at 270.7 kg N ha-1 in the CTS. The NTS enabled maximum yield at N dose 47% lower than the officially recommended one. Maximum relative commercial yield was associated with 31.1 g kg-1 of leaf N.

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Publicado

2025-06-04

Como Citar

Hahn, L., Kurtz, C., Ferlin Grazziotin, A., Bee, A. M., Feltrim, A. L., & Goulart Machado, R. (2025). Nitrogen doses and sources applied as top-dressing in onion crops grown under no-tillage and conventional tillage systems. Revista Ceres, 70(6), e70610. Recuperado de https://ojs.ceres.ufv.br/ceres/article/view/8172

Edição

v. 70 n. 6 (2023)

Seção

SOIL AND PLANT NUTRITION

Licença

Creative Commons License
Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.