Dairy Biosolids as a Source of Organic Matter for the Development of Compressed Substrates: An Applied Study on Tomato Plants (Lyopersicum esculentum mill)
摘要
This study promotes the agro-industrial transformation of biosolids from Colombia's dairy industry as a cost-effective solution for effluent management. The objective was to evaluate the impact of compressed substrates made from composted biosolids on the vegetative development of Lycopersicum esculentum Mill. The experimental design included two phases: germination and growth in substrates (CRD) and soil transplantation (CRBD). Five treatments were tested: T1 (90% biosolid, 6% guar gum, 4% coconut fiber), T2 (50% biosolid, 50% peat), T3 (10% biosolid, 50% coconut fiber, 40% peat), T4 (70% peat, 28% coconut fiber, 2% guar gum), and T0 (commercial substrate). Tomato plants in biosolid-based substrates germinated 2–3 days slower than in T0. However, T1 showed better root development in phase 1 (0.053 mm3 vs. 0.035 mm3 for T0) and outperformed others in phase 2 (3.1 mm3). Cost analysis revealed that biosolid substrates are 42.85% cheaper than commercial alternatives, with T1 priced at 500 COP per unit compared to 875 COP for T0. The findings suggest that biosolid-based substrates are an affordable and effective alternative for agricultural use, enhancing root development and supporting sustainable farming practices.