PHYSICOCHEMICAL AND MICROBIOLOGICAL CHARACTERIZATION OF THE SUPERMAGRO BIOPREPARATION. EFFECTS OF ITS PRE-HARVEST APPLICATION ON STRAWBERRY QUALITY PARAMETERS
Keywords:
bio-inputs, agroecology, Fragaria x ananassaAbstract
The objective of this work was to characterize physicochemical and microbiologically the bio-input prepared by agroecological producers “Supermagro” (SM) and to study the effect of its pre-harvest application on strawberry (Fragaria x ananassa Duch.). As more relevant results, different SM samples presented an average pH of 5.0, macronutrients concentration of 0.7; 0.26; 2.67; 2.64; 0.46 and 0.21 g L-1 for N, P, K, Ca, Mg and S, respectively, and 0.71 g L-1 for Na, and presence of micronutrients. The total count of heterotrophic bacteria was 4.5 x 104 CFU mL-1, with 50 different types of colonies observed. In vitro tests showed the ability of SM to inhibit the growth of phytopathogens of relevance in strawberries, such as Botrytis cinerea and Rhizopus stolonifer. Regarding the effect of field application of SM, no significant differences were observed in the pH, content of anthocyanins, and phenolic compounds between treated fruits and controls. Notably, there is evidence of lower in vitro hydration of cell walls and significantly lower in vitro growth of fungal pathogens in cell walls isolated from treated fruits compared to controls, suggesting greater integrity of this structure, whose metabolism is the main determinant of firmness.
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Copyright (c) 2023 Pablo Burges, Nazarena Nadler, Mailén Hirsch, Maximiliano Bongiorno, Natalia Villarreal, María Marina
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