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Rhizobacteria based bio-fertilizers: a sustainable alternative for the N fertilization of tropical forests in central Mexico.

Fertilization is a technique for supplying plants with enough macronutrients (specially N, P and K) to ensure their survival and enhance their growth. The most common fertilizers are substrates of these elements that can be applied directly into the soil. In silviculture the use of N fertilizers to enhance tree growth is increasing as our need for tree-based products does. But , but the production of chemical N fertilizers through the Haber-Bosch process emits great quantities of greenhouse gases, and their misuse can lead to eutrophication of water bodies, transforming them into dead zones. In this study 30 species of bacteria from the Rhizobium genus were tested as bio-fertilizers as an alternative to traditional chemical N fertilizers. The study shows the effect of the bacteria in the growth of Cedrela odorata trees in the municipality of Jopala in the state of Puebla, Mexico, in a tropical forest area with a mean altitude of 465 meters above sea level, a mean annual temperature of 22°C and a mean annual precipitation of 2,767 mm. The methodology consisted on adding selected species of PGPR (Plant Growth Promoting Rhizobacteria) directly into the seeds before seeding and recording the growth in height and diameter of the trees between the second and the fourth year of growth. From the 30 species of Rhizobacteria previously selected, 10 species demonstrated to be beneficial for the growth of Cedrela odorata, having better results than the control seeds, that had a height growth of 2.80 m per year, and a diameter increase of 5.70 cm per year. Among these species the height growth ranges between 3.00 and 3.61 m per year -1, and the diameter increase between 6.00 and 8.20 cm per year -1. From this information it can be concluded that these particular species of Rhizobacteria are beneficial for the growth of Cedrela odorata trees in tropical forests in Mexico and can be used as a sustainable alternative to be used as biofertilizers. Though there is still space for further research in the industrial production, and big scale commercialization and application of bio-fertilizers in the future.

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Keywords: Cedrela odorata, rhizobacteria, bio-fertilizers, tropical forests,.

Disclaimer: This abstract is not based on real research.