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Biostimulants have recently gained increased attention due to their multiple benefits for sustainable agriculture. In this study, three food processing by‐products – fennel processing residues (FPR), lemon processing residues (LPR) and brewer's spent grain (BSG) – were investigated as potential sources of biostimulants. Their aqueous extracts as individual and associated applications were assessed for their effects on agronomic, quality and metabolic performance of organic tomato in comparison to extract of humic substances (HS) and untreated control (CTRL).

Only FPR extracts stimulated shoot growth and tomato dry matter content, whereas all candidates improved tomato yield. FPR and BSG increased fruit mineral content and BSG‐FPR‐LPR in combination enhanced titratable acidity. FPR‐treated fruits had also 20% more vitamin C than CTRL, and higher phenol content was …