Urine has a high nitrogen content, and wood ash is rich in calcium and magnesium. All of these nutrients are needed for vegetable growth.
Therefore, according to National Geographic, ash mixed with urine yields ~4 times more tomatoes than otherwise. Also, the fertilized tomatoes had significantly higher levels of magnesium, key for bone, muscle, and heart health.
The only thing the fertilizer did not do is improve taste - tomatoes were as tasty with or without fertilizer.
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