Compost Based on Pulp and Paper Mill Sludge, Fruit-Vegetable Waste, Mushroom Spent Substrate and Rye Straw Improves Yield and Nutritional Value of Tomato

Urban Farm DB summary

This study investigated the use of compost made from pulp and paper mill sludge, fruit-vegetable waste, mushroom spent substrate, and rye straw as a growing medium for container-cultivated tomatoes. Tomato plants grown in compost-enriched media showed higher leaf greening, more ripe fruit, and increased levels of polyphenols, flavonoids, potassium, calcium, magnesium, and copper compared to controls. Specifically, a medium with 25% compost, 30% high peat, 15% low peat, 20% pine bark, and 10% wood fiber yielded the highest fresh fruit weight, total polyphenol content, and L-ascorbic acid levels.