Sugarcane vinasse as substrate for the culture of inoculants and ulterior fertigation of soils: contributions for a circular and green economy

TORRES MARIELA ANALÍA; ALEJANDRA LEONOR VALDEZ; ANGELICOLA, MARÍA VIRGINIA; RAIMONDO, ENZO EMANUEL; HIPÓLITO F. PAJOT; CARLOS G. NIETO PEÑALVER

SCIENCE OF THE TOTAL ENVIRONMENT

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2023

0048-9697

Vinasse is a by-product with a key role in circular economy. In this work, we analyze sugarcane vinasse as culture medium for obtaining single and mixed inoculants. Trichoderma harzianum MT2 was cultured in single and sequential co-culture with Pseudomonas capeferrum WCS358 or Rhizobium sp. N21.2. Fungal biomass in single culture was more than three folds higher in vinasse than in a standard medium, and was higher in co-culture with Rhizobium sp. N21.2 than with P. capeferrum WCS358. Bacterial growths in vinasse, in particular P. capeferrum WCS358, were improved in co-culture with T. harzianum MT2. Residual vinasses presentedalmost neutral pH and lower conductivities and toxicity than raw vinasse. Fertigation withresidual vinasses modifies characteristics of soil evidenced in the total N, cation exchangecapacity, urease and acid phosphatase, and microbial metabolic diversity, in comparison to rawvinasse. In general, soil fertigation with residual vinasse from co-culture with P. capeferrum WCS358 is more similar to irrigation with water. Treatment evaluation indicates that vinasseis suitable for the production of mixed inoculants containing T. harzianum. The co-culture withP. capeferrum WCS358 improves the characteristics of the residual vinasse allowing afertigation with less detrimental effect in soil in comparison to Rhizobium sp. N21.2. Obtainingvaluable biomass of single or mixed inoculants in vinasse with lower ecological impact isrelevant for the circular and green economy.