Domestic wastewater supplementation enhances biomass, nutrient uptake, and water use efficiency of tomato in non-circulating hydroponic systems.
Valentine EO, Oluoch B, Mandizvo T, Musazura W, Odindo A
Phytoremediation
If you grow tomatoes, peppers, or herbs in containers or raised beds, this research points toward a future where nutrient-rich household greywater does much of the feeding work your fertilizer bag currently handles.
Researchers grew tomatoes in hydroponic setups using three different water sources: treated sewage water alone, treated sewage water boosted with half the normal amount of fertilizer, and regular tap water with full fertilizer. The plants fed with the half-fertilizer wastewater mix grew almost as well as those on tap water with full fertilizer — and far better than those on wastewater alone. This suggests that treated wastewater, when lightly supplemented, can replace both freshwater and most of the fertilizer normally needed to grow food crops.
Key Findings
Tomatoes grown with wastewater + 50% fertilizer yielded 2,975 g/plant, only 4% less than the full-fertilizer tap water group at 3,107 g/plant — a statistically insignificant difference.
Wastewater alone (no fertilizer supplement) produced only 1,500 g/plant — roughly half the yield of the fertilizer-supplemented treatments — and cut water-use efficiency from ~77 g/L to 37.5 g/L.
Shoot concentrations of key nutrients (nitrogen, potassium, calcium, zinc, iron) were significantly higher in the 50%-fertilizer wastewater group than in the wastewater-only group, showing that modest supplementation closes most of the nutrient gap.
chevron_right Technical Summary
Growing tomatoes with treated wastewater mixed with just half the usual fertilizer produced nearly the same yield as using fresh water with full fertilizer — suggesting growers could cut fertilizer use in half and eliminate freshwater consumption without sacrificing much output.
Abstract Preview
Within a circular nutrient economy framework, supplementing wastewater with commercial hydroponic fertilizer mix has been proposed to reduce nutrient variability, enhance phytoremediation, and supp...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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