• Chicken waterer
• Homesteading books

Boing Boing has an interesting post on a National Geographic news article that reports on a recent round of tests to see how productive a mix of human urine and wood ash would be for tomatoes.

The plants fertilized this way yielded 4 times as much fruit as non fertilized plants, and bore a significant increase in the nutrient magnesium.

I would be a little concerned about the long term salt build up that may occur with this method and need more information before I try something as risky as mixing a salty substance with our topsoil.