Spent mushroom substrates increased soluble saccharides, vitamin C and soluble solid contents.

growing medium · quality: phytochemicals · Solanum lycopersicum (tomato)Positive and negative results

11 papers in the same direction as this claim · 3 in the opposite direction · 2 reporting no difference from an alternative

1. negative
   Lycopene, beta-carotene and lutein concentrations in tomato fruit were significantly lower in substrates amended with different biochars than in the control.

   Influence of biochar application on nutritional quality of tomato (Lycopersicon esculentum) · 2015 · compared with the control

   Opposite direction

2. no effect
   Ascorbic acid did not differ significantly across substrates.

   Effect of some culture substrates (date-palm peat, cocopeat and perlite) on some growing indices and nutrient elements uptake in greenhouse tomato · 2011

   Opposite direction

3. no effect
   Vitamin C content of tomato fruit was not influenced by the soilless system or water/salinity stress (25.2 mg/100 g fresh matter).

   (307) NFT versus Subirrigation: II. Tomato Fruit Quality Grown in Closed Soilless Systems under Salinity or Water Stress · 2005

   Opposite direction

4. no effect
   Coco-peat tomato vitamin C was 26.07 mg/100 g fruit, at par with vermiculite at 26.52 mg/100 g.

   Use of Coco peat for soilless cultivation of tomato · 2020 · compared with vermiculite

   No difference from an alternative

5. no effect
   Vitamin C content did not differ significantly among substrates.

   Organic and conventional production of tomato fruit and seed · 2025 · compared with between substrates

   No difference from an alternative

6. positive
   Organic substrate fruit had significantly more vitamin C.

   Calcium, Iron, Potassium, Phosphorus, and Vitamin C Content of Organic and Hydroponic Tomatoes · 1998 · compared with hydroponic media

   Same direction

7. positive
   Balanced sand culture yielded fruit with as much or more ascorbic acid than good soil.

   Effect of Mineral Nutrition on the Ascorbic-Acid Content of the Tomato · 1942 · compared with good soil

   Same direction

8. positive
   EGTHB-SMS significantly increased tomato total polyphenol and flavonoid content.

   Earthworm Grazed-Trichoderma harzianum Biofortified Spent Mushroom Substrates Modulate Accumulation of Natural Antioxidants and Bio-Fortification of Mineral Nutrients in Tomato · 2018

   Same direction

8 papers more in this group