Abstract
PurposeThe nutritional content of fermented fertilizers was determined, and the effect of its application in combination with hydrogel was evaluated in a bioassay with maize plants.MethodsThe fertilizers were produced in artisanal biodigesters and the bioassay was carried out in pots with CP-569 maize. The nutritional content of the fermented fertilizers was evaluated, and in maize plants growth variables were measured, along with N–P–K contents in the aerial and root biomass.ResultsThe types of biol show different characteristics for organic matter, N, N–NH4, N–NO3, P, K, Ca, Mg, Fe, Cu, Zn, Mn and B, as well as physical characteristics. The terms of the bioassay, the treatments with super absorbent polymer (SAP), biol and biol + SAP, showed significant statistical differences in terms of plant height, stem diameter and number of leaves 30 days after emergence. In the dry weight of aerial and root biomass, no statistical differences were found. In terms of the contents of N–P–K in biomass, statistical differences were found for P in aerial biomass and K in both aerial and root biomass.ConclusionDue to their physical and chemical properties, biols are an alternative to fertilizers. With the application of biol and SAP, maize plants undergo significant increases in height, stem diameter and number of leaves. By applying biol and SAP, the contents of N–P–K were not increased significantly in the aerial and root biomasses in comparison to the control.
Highlights
To produce high-quality crops (Fathy et al 2018), an alternative to organic fertilizer is fermented fertilizer, which is the name given to the effluents produced in the fermentation or digestion of organic wastes from biodigesters (Ndubuaku et al 2013)
The objective of the research was to evaluate the effect of the application of fermented liquid fertilizer and superabsorbent polymers on the growth and absorption of N–P–K in maize plants through a bioassay
Bad odors are eliminated, which is an indicator that the fermentation has been carried out successfully, as it happened in this study
Summary
To produce high-quality crops (Fathy et al 2018), an alternative to organic fertilizer is fermented fertilizer, which is the name given to the effluents produced in the fermentation or digestion of organic wastes from biodigesters (Ndubuaku et al 2013). Biogas production through anaerobic digestion leaves organic residues (digestates), which are rich in Digestate or effluent is composed of a liquid fraction known as biol and the solid fraction biosol, the biol being the most widely used and which accounts for 90% of the effluent (Rivero 2012). The quality of the biol, taking into account the process of fermentation in terms of the composition of nutrients and physical properties, depends on the materials (inputs) used during fermentation (Ndubuaku et al 2013). Biol is obtained with the use of inputs such as animal manure, mainly bovines
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