Can NBPT urease inhibitor in combination with Azospirillum brasilense inoculation improve wheat development?

Fernando Shintate Galindo, Marcelo Carvalho Minhoto Teixeira Filho, Salatiér Buzetti, Paulo Humberto Pagliari, José Mateus Kondo Santini

Research output: Contribution to journalArticle

Abstract

This research was developed to investigate the use of Azospirillum brasilense to enhance N use in wheat cropping systems and to assess the potential interactions between inoculation and urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT). The study was set up under a no-till system in a Rhodic Hapludox. The experimental design was a randomized completely block design with four replicates arranged in a two N source (urea with and without NBPT) × five N rate applied as side dress (0–200 kg ha−1) × two inoculation (with and without A. brasilense) factorial scheme. Inoculation with A. brasilense in combination with application of 100 and 150 kg N ha−1 was found to increase grain yield by 19.6 and 18.8%, respectively. Inoculation also increased biomass N uptake by 66.9% when N was omitted. Inoculation and NBPT application were found to increase NUE by 23.7% compared to inoculation in combination with conventional urea and by 140% compared to NBPT without inoculation. In addition, inoculation increased plant height and NUE by 13.2 and 49%, respectively, compared with non-inoculated plots. Conventional urea and urea with NBPT had a similar effect on nutrient concentration, N uptake, leaf chlorophyll index, biomass weight and wheat grain yield. This study showed positive improvements in wheat production parameters as a result of inoculation, but the potential benefits of NBPT use were less evident. Further research should be conducted under growing conditions that provide increased N volatilization to better study the potential of NBPT application.

Original languageEnglish (US)
Pages (from-to)131-143
Number of pages13
JournalNutrient Cycling in Agroecosystems
Volume117
Issue number2
DOIs
StatePublished - Jun 1 2020

Keywords

  • N-(n-butyl)thiophosphoric triamide
  • Nitrogen fertilization
  • Nutrient leaf concentration
  • Plant growth promoting bacteria
  • Triticum aestivum L

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