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Sugarcane Productivity as a Function of Nitrogen Fertilization and Inoculation with Diazotrophic Plant Growth-Promoting Bacteria

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Abstract

Sugarcane ratoons respond to nitrogen fertilizer application, but the N efficiency is low. Diazotrophs applied as a growth promoter bacterium can influence crop yield by several mechanisms, including a greater root growth and higher N absorption. The objective of the present work was to evaluate the stalk and sugar yields, and the economic index of sugarcane as a function of nitrogen fertilization and inoculation with diazotrophic plant growth-promoting bacteria (DPGPB). Two experiments were implemented in areas of two sugarcane mills in the state of São Paulo, Brazil: one in the Diamante Mill and one in the Santa Helena Mill. The experimental design was a randomized complete block with four N-fertilizer doses (0, 50, 100 and 150 kg ha−1), with or without DPGPB inoculation using five replicates. The application of the inoculant promoted a productivity increase in the Diamante Mill for all treatments with N, even in the absence of N-fertilization, while at the Santa Helena Mill that occurred with the 50 kg ha−1 dosage. The inoculation with DPGPB, together with the application of the 50 kg N ha−1 dose, achieved the highest economic return at both mills. The application of the inoculant associated with a low dose of N-fertilizer was profitable and proven feasible for field application. The results evidenced the viability of the technology for sugarcane production, with gains in productivity and a possible reduction in nitrogen fertilization.

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Acknowledgements

This research was supported by The Coordination of Improvement of Higher Education Personnel—CAPES and to the Fundação Carlos Chagas de Amparo à Pesquisa do Estado do Rio de Janeiro—FAPERJ; for the authors fellowships. To the National Council of Scientific and Technological Development—CNPq—[grant numbers 470824/2013-1 and INCT 456133/2014-2]. Authors would like to thank the Diamante and Santa Helena Mills were the experiments were conducted.

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Correspondence to Veronica Massena Reis.

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Pereira, W., Sousa, J.S., Schultz, N. et al. Sugarcane Productivity as a Function of Nitrogen Fertilization and Inoculation with Diazotrophic Plant Growth-Promoting Bacteria. Sugar Tech 21, 71–82 (2019). https://doi.org/10.1007/s12355-018-0638-7

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  • DOI: https://doi.org/10.1007/s12355-018-0638-7

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