Azotobacter chroococcum and Azospirillum lipoferum as biostimulants in Ipomoea batatas Lam. culture
Introduction. The excessive use of nitrogen fertilizers in sweet potato crops contributes to the ecosystems contamination; to reduce this effect and improve crop productivity, the incorporation of plant growth promoting rhizobacteria (PGPRs) in the strategies of crop managment constitute a sustainbale tool. Objective. The objective of this research was to incorporate the bacterial strains Azotobacter chroococcum IBCR19 and Azospirillum lipoferumIBSC7 in the nitrogen fertilization, and to evaluate their effect on the yield and bromatological composition of sweet potato tuberous roots (Ipomoea batatas Lam). Materials and methods. The study was made in the municipality of Corozal (Sucre, Colombia) during the months of June to October of 2017. An experimental area of 840 m2 was used where twenty-four plots with apical cuttings of the 15020078 accession were established, and distributed under a completely randomized design with an increased factorial arrangement (3x2+2). Root dry matter, yield, and bromatological composition of sweet potato roots were evaluated. Results. Fresh yield and root dry matter showedsignificant differences (p≤0.05) among the treatments, where the application of A. chroococcum IBCR19 and 75% of nitrogen fertilization reached the highest average values of yield and dry matter of 12.18 t.ha-1 y 2.92 t.ha-1, respectively.Similarly, the protein and ethereal extract concentrations differed significantly (p≤0.05) between the inoculatedtreatments in relation to the absolute control. Conclusion. Based on the results obtained, it can be inferred that the inoculation with A. chroococcum IBCR19 reduced the nitrogen fertilization levels by 25% and constitutes a promising strain as a biostimulant.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | spa eng |
| Published: |
Universidad de Costa Rica
2019
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| Online Access: | https://revistas.ucr.ac.cr/index.php/agromeso/article/view/33896 |
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