Coinoculation with plant growth promoting microorganisms as a sustainable tool for soybean growth and development

• Grant number: 23/09704-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2023
• End date: March 31, 2024
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Fernando Shintate Galindo
• Grantee: Maria Eduarda Barbante Felix
• Host Institution: Faculdade de Ciências Agrárias e Tecnológicas. Universidade Estadual Paulista (UNESP). Campus de Dracena. Dracena , SP, Brazil

Abstract

The use of plant growth promoting microorganisms (MPCPs) is increasing, especially in tropical conditions and can promote benefits in the growth and development of soybeans, with an impact on grain yield. Considering the benefits verified in several cultures with the inoculation of MPCPs, especially due to the phytohormonal effect acting directly in the promotion of plant growth, development of the root system, and consequently greater absorption and use of water and nutrients, in addition to the potential for increasing BNF and in the solubilization and efficiency of use of nutrients applied via fertilizers, it is believed that co-inoculation with Bradyrhizobium sp. together with MPCPs, such as Azospirillum brasilense, Bacillus aryabhattai and Trichoderma harzianum can favor the development of the crop, and consequently the grain production. This study aimed to evaluate the effect of co-inoculations with plant growth-promoting bacteria and the fungus T. harzianum on soybean growth, development and grain yield. The research will be carried out in the municipality of Dracena - SP, in a typical dystrophic Ultisol with a sandy texture. The experiment will be carried out in randomized blocks with four replications and 8 treatments: 1) control - inoculation only with Bradyrhizobium sp. no co-inoculations; 2) inoculation with Bradyrhizobium sp. + A. brasilense; 3) inoculation with Bradyrhizobium sp + Bacillus aryabhattai; 4) inoculation with Bradyrhizobium sp + Trichoderma harzianum; 5) Bradyrhizobium sp + A. brasilense + B. aryabhattai; 6) Bradyrhizobium sp + A. brasilense + T. harzianum; 7) Bradyrhizobium sp + B. aryabhattai + T. harzianum; 8) Bradyrhizobium sp + A. brasilense + B. aryabhattai + T. harzianum. All treatments will be applied sprayed in the total area at the beginning of the vegetative development (V1/V2), except the inoculation with Bradyrhizobium sp. which will be carried out on the seeds. Leaf chlorophyll index (ICF), gas exchange parameters (IRGA), shoot and root dry mass at full flowering (R2) and shoot dry mass, production components and grain yield at the end of the cycle (R8), as well as N accumulation in shoots and grains will be evaluated.