Summary: The study aimed to evaluate the effects of three organic fertilizers on greenhouse lettuce’s morpho-physiological and agronomic traits under poor soil quality conditions. The tested organic fertilizers were poultry manure, vinasse-based fertilizer, and insect’s frass fertilizer. The results showed that vinasse-based fertilizer was the most suitable for providing mineral nitrogen in the short term. All fertilizers increased shoot fresh and dry weight, with vinasse-based fertilizer and insect’s frass having a more pronounced effect. Insect frass reduced leaf nitrate concentration by 27% and reduced toxic heavy metal Pb by 46% in organically fertilized lettuce leaves. Soil enzymatic activities were enhanced by poultry manure and insect’s frass, while vinasse-based fertilizer increased ArS, NAGase, and THA. The data suggests that the application of organic fertilizers, particularly vinasse-based fertilizer and insect’s frass, is a suitable approach for mitigating soil salinity, enhancing soil biological fertility, and improving greenhouse lettuce’s agronomic performance.
Publication: Agronomy
