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Abstract(s)
Plant biostimulants can be microbial or non-microbial, and their function is to improve crops nutrients use efficiency. The aim was to evaluate the nutrients use efficiency of two non-microbial biostimulants from urban waste and olive by-product. The experiment was conducted in a hydroponic chamber in a vegetable (lettuce, Lactuca sativa) and in an aromatic plant (thyme, Thymus vulgaris L.). Three treatments were tested: C= commercial nutrient solution (NS); G1= NS + 5% biostimulant from olive by-product (pomace); B1= NS + 5% biostimulant from urban waste. In both G1 and B1 treatments, biostimulants were produced in aerated conditions. Each crop cycle lasted 22 days. During the experiment, temperature, humidity and luminosity of the chamber were monitored, as well as pH, CE, temperature and SN consumption. At the end of the experiment, root length (RL), leaf and root dry weight (DWL; DWR), leaf and root fresh weight (FWL; FWR) and number of leaves (NL) were measured. As main results, biostimulants presence resulted in an inhibitory effect on lettuce, particularly in NL and FWL. In contrast, biostimulants used in thyme, mainly G1, showed highest values of NL (~65% higher than C), FWL and DWL, and no significant differences between B1 in DWR. In conclusion, biostimulants from urban waste and olive by-product are promising for advancing sustainable agricultural practices and contributing to circular economy. However, a deeper understanding of their mechanism of action is essential for development and market.
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Citation
Segatelli, Ana; Figueiredo, Daniel; Machado, Telmo Nuno; Figueiredo, Tomás de; Hernández, Zulimar (2023). Plant Biostimulants from urban waste and crop by-product and their nutrients use efficiency. In i-Danha Food Lab. Idanha-a-Nova