Co-inoculation with diazotrophic bacteria in soybeans associated to urea topdressing

ABSTRACT Increased grain yield can be obtained via an interaction between plants and growth-promoting microorganisms. The Bradyrhizobium spp. are capable of fixing atmospheric nitrogen in soybeans [Glycine max (L.) Merril], and Azospirillum spp. induce the synthesis of phytohormones. The aim of this study was to evaluate inoculation with Bradyrhizobium and co-inoculation with Bradyrhizobium + Azospirillum brasilense in soybeans in combination with the application a topdressing of 0, 75 or 150 kg of N ha-1 of urea during the reproductive stage. Three soybean cultivars (BMX Ativa, TEC 6029 and BMX Potência), were tested in field experiments in Santa Maria, RS, Brazil, during two agricultural years (2013/2014 and 2014/2015) and two sowing times. Morphological, nodulation and yield components were evaluated. Co-inoculation increased the grain yield by 240 kg ha-1 compared with conventional inoculation. When co-inoculated, cultivars BMX Ativa, TEC 6029 and BMX Potência showed increased grain yields of 6, 4 and 12%, respectively. The application of 150 kg ha-1 of N as a topdressing increased the grain yield by 300 kg ha-1 in the co-inoculated cultivars TEC 6029 and BMX Potência, but without a financial return. When inoculated only with Bradyrhizobium, the cultivars did not respond positively to the application of urea.

Bibliographic Details

Main Authors:	Fipke,Glauber Monçon, Conceição,Gerusa Massuquini, Grando,Luiz Fernando Teleken, Ludwig,Rodrigo Luiz, Nunes,Ubirajara Russi, Martin,Thomas Newton
Format:	Digital revista
Language:	English
Published:	Editora da UFLA 2016
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500522
Tags:	Add Tag No Tags, Be the first to tag this record!