Nitrogen fertilization regarding maize crop in a semi-arid region

Autores

  • Viviane Cristina Modesto FEIS/UNESP - Ilha Solteira
  • Henrique Antunes de Souza
  • Ana Clara Rodrigues Cavalcante
  • Hévila Oliveira Salles
  • Adriano Rodrigues Lima
  • Carlos Tadeu dos Santos Dias
  • William Natale

DOI:

https://doi.org/10.15361/1984-5529.2017v45n4p443-452

Palavras-chave:

Zea mays L., fertilizantes N, diagnose foliar, componentes principais

Resumo

The correct management of fertilization, with the use of adequate source and doses of nitrogen, allied to cultivars adapted to certain edaphoclimatic conditions, is essential to obtain high yields. Thus, the objective of this study was to evaluate the nutritional N status, the physiological status and the grain yield of maize as a function of the application of nitrogen fertilizer sources and doses in Sobral - CE, in the northeastern semi-arid region. The design was in randomized blocks, in the factorial scheme 5x3+1. The treatments consisted of the combination of five forms of urea: conventional urea; urea + enzyme inhibitor; urea + polymer; urea + enzyme inhibitor + B + Cu; and urea + coating with elemental S, in three doses of nitrogen: 30, 45 and 60 kg ha-1, applied in coverage, in the V6 stage (six fully developed leaves), plus a control treatment without N. The maize variety studied was BRS Gorutuba. Nitrogen fertilization in maize coverage promoted greater increases in the content of leaf N, protein, SPAD index and grain yield, when compared to the control, without N. The highest grain yield of maize was obtained with the use of urea treated with urease inhibitor, at the dose of 47 kg ha-1.

Publicado

07/11/2017

Edição

Seção

Solos e Nutrição de Plantas - Soils and Plant Nutrition