Citas bibligráficas
Casique, R., (2018). Solubilización de fosfatos por bacterias aisladas de la rizósfera de leguminosas de cobertura creciendo en suelos degradados de la subcuenca del Cumbaza-San Martín [Universidad Nacional de San Martín. Fondo Editorial]. http://hdl.handle.net/11458/4134
Casique, R., Solubilización de fosfatos por bacterias aisladas de la rizósfera de leguminosas de cobertura creciendo en suelos degradados de la subcuenca del Cumbaza-San Martín []. PE: Universidad Nacional de San Martín. Fondo Editorial; 2018. http://hdl.handle.net/11458/4134
@misc{renati/1056146,
title = "Solubilización de fosfatos por bacterias aisladas de la rizósfera de leguminosas de cobertura creciendo en suelos degradados de la subcuenca del Cumbaza-San Martín",
author = "Casique Huamanguli, Roy Dandi",
publisher = "Universidad Nacional de San Martín. Fondo Editorial",
year = "2018"
}
Phosphorus (P) is essential for plants, but its availability in tropical soils is low (<7 ppm) due to its adsorption in acid soils with Fe and Al hydroxides. Since P is key to improving agricultural productivity in degraded tropical soils, a sustainable way to increase the P available for plants is using phosphate solubilizing bacteria (PSB). The study allowed the isolation and characterization of rhizospheric bacteria in four cover legumes, growing in degraded acid soils (DAS) of the upper and middle sub-basin of Cumbaza-San Martín. The BSF were grouped according to their origin and morphocolonial characteristics, and a representative strain was used for solubilization studies. The qualitative (EFS%) and quantitative solubility of phosphates (mg P L-1) in NBRIP medium and GELP medium were evaluated, both with tricalcium phosphate (Ca3(PO4)2), iron phosphate (FePO4) and phosphate aluminum (AlPO4), respectively. We isolated 132 strains of bacteria from the rhizosphere Vigna unguiculata, Canavalia ensiformis, Cajanus cajan and Crotalaria juncea. Only 44 strains were representatives of the morphocolonial groups under study. In relation to the SAI%, Ca3(PO4)2 was solubilized by 80% of the strains (127.92-505.75%), 9,1% solubilized by AlPO4 (148.05- 241.80%) and no strain solubilized FePO4. In the quantitative evaluation, the solubilization of FA was high (55.99 mg P L-1) as well as in the solubilization of FePO4 (43.29 mg P L-1). In relation to the solubilization of AlPO4 and FePO4, positive correlations were observed for pH and negative for titratable acidity, indicating that this process is influenced by the type of soil and the type of strain. In conclusion, DASs harbor PSB with good solubilization potential to be used as inoculants.
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