Resumen del producto

The objective was to produce and assess the biofertilizer effect of the cyanobacteria Fischerella sp., encapsulated in alginate and/or chitosan. The cyanobacteria were reactivated, and cultured under environmental conditions up to a volume of 20 L (2500 beads / L). A culture of radish was used to test four types of encapsulation: Ca-alginate beads and Ca-alginate (A) / chitosan beads (AQ), both without (AC and AQC) and with (AFE and AQFE) cyanobacteria. Triple 17 (NPK), powder alginate (AP), chitosan powder (QP), Fischerella (FF) and control = Water (T) were used as controls. Weight, length, bulb diameters and chlorophyll a concentration in the radishes were measured weekly in a culture with 40 plants per treatment (three replicates). Statistical analysis showed significant differences. The bioencapsulated AFE, AQFE, and T17 promoted the growth and development of radish plants. From the experimental treatments, Fischerella encapsulated was chosen in Ca-alginate (AFE) to perform another experiment, combining the bioencapsulated developed with different proportions of fertilizer (T17). The results showed that the combination of 40% of bioencapsulated and 60% of fertilizer, produced a significantly higher growth and longer leafs (21 cm), polar diameter (3.2 cm), equatorial bulb (1.8 cm), higher fresh weight of leaves (9.5 g), fresh bulb weight (5.6 g) and chlorophyll "a" content (0.9 mg g -1). Proximal chemical analysis showed no significant differences in ash, fat, fiber, and protein among radish plants. The physicochemical evaluation of the substrate showed significant differences between treatments. The content of nitrogen (0.1%), phosphorus (70%) and water retention capacity (10%) increased compared to the initial conditions. Concluding that the Ca-alginate- Fischerella encapsulated is an efficient biological fertilization alternative that contributes to providing the nitrogen required for by the plant and allows to reduce the amount of chemical fertilizer by up to 40%.

Palabras clave: cyanobacteria; Fischerella; alginate; encapsulated; beads; Growth; radish

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