Yield of sugarcane varieties and their sugar quality grown in different soil types and inoculated with a diazotrophic bacteria consortium

Abstract

Sugarcane is a crop of great economic, social, and environmental relevance in Brazil. The country is the largest sugar producer and the second largest bioethanol producer in the world. The goal of this study was to evaluate the efficiency of a sugarcane inoculant composed of five diazotrophic bacterial strains, as well as nitrogen fertilization of two sugarcane varieties. Two experiments were carried out on two varieties using an experimental design composed of complete randomized blocks in a factorial of two varieties and three treatments with four replicates. The treatments can be described as: inoculation with the consortium of five diazotrophic strains, or N fertilization with 120 kg ha⁻¹, and one control treatment. The following parameters were then evaluated: stem yield, accumulation of total dry matter, nitrogen content, quality of the sugarcane juice, and ¹⁵N natural abundance on flag-leaves. Inoculation and N fertilization on the Sapucaia plantation promoted increases of stem yield equivalent to 22.3 and 26.5 Mg ha⁻¹ in the RB867515 variety, in comparison to the control, respectively. Inoculation and N fertilizer used for the Coruripe plantation increased stem yield of 38.0 and 42.4 Mg ha⁻¹, respectively, with the RB867515 variety, while RB72454 showed increases of 16.7 and 37.5 Mg ha⁻¹, both compared to the control. Biological nitrogen fixation was not affected by the treatments, however, both treatments increased the total recoverable sugar yield. Benefits from inoculation appeared to promote plant growth due to the plant–bacteria interaction.

Keywords:

• Saccharum spp.
• nitrogen
• plant growth promotion
• biological nitrogen fixation
• ¹⁵N natural abundance

Classification:

• Agronomy & Crop Ecology

Acknowledgments

The authors would like to thanks the Rio de Janeiro Rural Federal University, Agronomy Institute – Soil Department for the fellowships of the students. In addition, great consideration is given to the Brazilian Council for Scientific and Technological Development (CNPq) and Carlos Chagas Foundation (FAPERJ) for the research scholarship granted to the researchers from Embrapa Agrobiology. Sapucaia and Coruripe Mills are acknowledged for their support to conduct this research. The study publication was authorized by Embrapa Agrobiologia Editorial Publication Committee.