Nitrogen use efficiency of pioneer and modern wheat cultivars

Authors

  • Eduardo Beche Universidade Tecnológica Federal do Paraná
  • Giovani Benin Universidade Tecnológica Federal do Paraná
  • Elesandro Bornhofen Universidade Tecnológica Federal do Paraná
  • Samuel Cristian Dalló Universidade Tecnológica Federal do Paraná
  • Luiz Henrique Scarparo Sassi Universidade Tecnológica Federal do Paraná
  • Ronaldo de Oliveira Universidade Tecnológica Federal do Paraná

DOI:

https://doi.org/10.1590/S1678-3921.pab2014.v49.19719

Keywords:

Triticum aestivum, uptake efficiency, utilization efficiency, genetic breeding, nitrogen remobilization, genetic selection

Abstract

The objective of this work was to characterize Brazilian wheat cultivars, developed in different decades, as to their nitrogen use efficiency, under different availabilities of the nutrient. Ten wheat cultivars, released between 1940 and 2009, were subjected to four nitrogen fertilization rates (0, 60, 120, and 180 kg ha‑1 N), under a controlled environment, in a randomized complete block design, with three replicates. Grain yield increased in 0.54, 0.74, 0.74, and 0.82% per year at the rates of 0, 60, 120, and 180 kg ha‑1 N, respectively. Nitrogen uptake and utilization efficiencies were positively associated with N use efficiency, with strengthening relation under high N availability conditions. Modern cultivars are more efficient in N use and tolerate lower rates of the nutrient in comparison to pioneer cultivars. For the development of more efficient cultivars in N use, wheat‑breeding programs should prioritize the selection of genotypes with higher N uptake, remobilization, and utilization efficiencies.

Published

2014-12-12

How to Cite

Beche, E., Benin, G., Bornhofen, E., Dalló, S. C., Sassi, L. H. S., & de Oliveira, R. (2014). Nitrogen use efficiency of pioneer and modern wheat cultivars. Pesquisa Agropecuaria Brasileira, 49(12), 948–957. https://doi.org/10.1590/S1678-3921.pab2014.v49.19719

Issue

Section

CROP SCIENCE