African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6839

Article in Press

Forms of nitrogen application in different stages of development on soybean

Cassiano Spaziani Pereira, José Roberto Rocha, Ivan Vilela Andrade Fiorini, Helcio Duarte Pereira, Adriano Alves Silva, Ewerton Lelys Resende

  •  Received: 26 July 2018
  •  Accepted: 11 September 2018
In Brazil, inoculation with Bradyrhizobium japonicum and Bradyrhizobium elkanii strains is the main form of Nitrogen (N) supply to soybean, but there are reports of the use of mineral N as a complement to biological fixation. The objective of this word was to evaluate the effect of different forms and phenological stagestimes of N application on the development and yield of soybean. The treatments include a control without N application and in all other treatments 10 kg ha-1 of N was applied, altering the phenological stagetime (V2, V4, R1 or R2) and the application form, namely, at sowing, broadcasted on topdressing or by leaf spraying. The application of N provided an increase in leaf area, shoot dry mass of shoot, number of nodules and dry mass of nodules in treatments with application of N at sowing and N at V2 on topdressing. For plant height, the treatment with N at V2 by leaf spraying was superior compared to control. The weight of one thousand seeds was not affected by N application. For grain yield the treatments with application of N by leaf spraying in V2 and R1 were highlighted. The greatest increase in grain yield on soybean is achievedreached with application by leaf spraying at V2 stage. The application of mineral N promoted an increase in grain yield and some of its components, as well as in morphological traits. However, the best way and phenological stage to provide that mineral N differed for the trait in question.

Keywords: nodulation, foliar fertilization, phenological stages